JPH05215202A - Driving disk - Google Patents

Abstract

PURPOSE: To reduce the required construction space to simply assemble a drive disk at low cost by the drive disk so as to have a range extendable in the outer axial direction in the radial direction equipped with a forming part for drive member and be constituted so that a vibration damping mechanism and a damper are mutually fit in the axial direction. CONSTITUTION: This drive disk 1 is fixed on the drive shaft of an internal combustion engine and has an input member 3 and a relatively rotatable output member 4 which are rotation-connected via a damper 5 with accumulator compressive in the circumferential direction, for instance a rotatably connected via a damper 5 with coil compression spring, and supported relatively rotatable, and, further, a vibration damping mechanism 25 with damping mass 29 connectable as the drive disk 1 via a damping body 28 is equipped on. A range in which the drive disk 1 is extended outside in the axis direction in the radial direction equipped with a forming part 11 for the drive member is provided and a damping mass 29 and a damper 5 are placed in the radial direction inside the range 20, and the vibration damping mechanism 25 and the damper 5 are constituted so as to be mutually fit in the axis direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a drive disc for a belt drive or a chain drive, in particular for driving an auxiliary unit of an internal combustion engine, the drive disc being an on-axis such as the drive shaft of an internal combustion engine. Shock absorber having an input member and an output member rotatable relative to the input member, the members being circumferentially compressible, for example, a force accumulator, for example, a coil compression spring. A vibration damping mechanism having a damping mass, which is rotatably connected to the drive disk and is rotatably supported relative to each other via a bearing, and can be coupled to the same shaft as the drive disk via a buffer. Regarding the type in which is provided.

[0002]

2. Description of the Prior Art A drive disk of this type is already in good agreement with the present invention in West German application P412620.
It is known from specification 9.3.

[0003]

SUMMARY OF THE INVENTION The object of the invention is to improve a drive disk of the type mentioned at the outset, in particular to reduce the required structural space and to simplify the assembly,
Another object is to make the drive disk according to the invention particularly simple and inexpensive to manufacture.

[0004]

SUMMARY OF THE INVENTION According to the invention, the object is to provide a radially outer axial direction in which the drive disk mentioned at the outset comprises a molding for an endless drive member such as a belt or a chain. A damping mass and a damping device are arranged radially inward of this range, in which case the outer axial range, the vibration damping mechanism and the damping device are fitted axially into one another. It was solved by becoming.

[0005]

As a result of such an arrangement, a particularly compact drive disk is obtained which is of relatively small size in the radial direction and especially in the axial direction.

Particularly preferably, the damping mass and the damping device are arranged in the axial extent of at least approximately the outer axial range, in which case the damping mass can be designed annularly and of the damping device or of the damping device. Axial over the energy store.

For constructing the drive disk, it is further advantageous if an annular damping mass is provided directly adjacent to the outer axial region and radially inward of at least approximately this region, in which case the outer shaft is provided. Between the directional range and the damping mass,
A very small gap, for example 1 mm to 2 mm, is provided.

Furthermore, it is advantageous to provide an input member of the damping mechanism in the form of a disc or cup which is arranged radially inside the annular damping mass in order to form the drive disc.

This is because the shock-absorbing member of the shock-absorbing device is housed in the free space formed by the input member of the damping mechanism at least approximately in the axial direction in order to save space. The damping mass and the input member of the damping mechanism are connected by a ring of elastomer.

In an advantageous configuration of the invention, the input member of the damping mechanism can be driven by the shaft and at the same time can support the input member of the shock absorber. The fixing point between the drive disc and the input member of the damping mechanism can preferably be provided radially inside the bearing between the drive output member and the drive input member of the drive disc.

For mounting the unit consisting of the drive disc and the damping mechanism, the cup-shaped or disc-shaped recess of the input member of the damping mechanism is preferably directed towards the axial end to which the input member of the damping mechanism is fixed. It is opened, that is, formed in a concave shape toward the shaft end.

Advantageously, the fixing point between the input member of the damping mechanism and the input member of the shock absorber and the rolling bearing between the output member of the shock absorber and the input member are provided at at least approximately the same axial height. There is.

Due to the structure and the functioning of the drive disc, it is advantageous to view the outer axial range with the forming part, the annular damping mass, the energy storage device in the radial direction from the outer side to the radial direction inward. And a bearing arranged between the output member and the input member of the shock absorber.

In this case, the energy store is preferably housed inside a substantially sealed casing which has an annular outer section and is at least partially filled with a viscous medium, for example grease. Has been done.

In this case, the casing is constituted at least in part by the output member of the shock absorber which supports the endless molding for the drive member.

The output member of the shock absorber can be at least partially formed by a sheet metal forming member, which carries or has an axial extension with a radially outer, endless forming portion for the drive member. And radially inward, starting from one axial end of the addition,
It extends by forming an annular curve extending axially within the structural space confined by an outer appendage for receiving and guiding the energy store.

On the inner side in the radial direction of the curved portion, the thin plate molding member has another sleeve-shaped additional portion, which has a bearing seat for the outer race of the rolling bearing on its inner peripheral surface. ..

Another sheet metal forming member is provided, which is connected to the first or one sheet metal forming member via a radially outer region in order to form an annular receptacle or casing for the energy store. ing. This further sheet metal molding also has one or more bends to form a receptacle for the energy store.

In such an arrangement, preferably at least one, preferably two, sheet-metal forming elements have a push-in deformation which is received in the area of an annular or annular receiving part. It has a support for the end region of the energy store housed in the part.

The input member of the shock absorber, which is connected to the shaft, likewise preferably has a load range which extends radially and in the circumferential direction in the end region of the adjacent energy store. Engaged in between.

The shock absorber input member has an axially extending range which extends radially inward at one end and radially outward at the other end.
It has moved to a flange range that has a load range for the energy store. In this case, the load range is radially engaged in an annular or annular receptacle for the energy store.

The axial extent of the input member of the shock absorber preferably receives the inner race of the rolling bearing. Furthermore, this axial range can be formed in the shape of a cup and, over the circumferential direction, has a forming part for the assembly tool which holds the drive disc on the shaft in a non-rotatable manner during assembly.

The cup-shaped recess inside or in the center of the input member of the shock absorber is preferably closed by a cover cap. The cover cap is supported by the output member of the shock absorber. The cover cap is preferably mounted on the input member of the shock absorber after mounting the drive disc on a suitable shaft.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENT The belt wheel shown in FIGS. 1 and 2 is non-rotatably connected to a driven shaft, such as a crank shaft of an internal combustion engine, via a connecting member 2.

The belt wheel 1 has an output member 4 and an input member 3 which are connected to each other via a rotationally elastic shock absorber 5. The output member 4 is formed from two thin plate-shaped members 6, 7, which are rigidly connected to one another and have an annular cutout 8 for the energy store 9 of the shock absorber 5 as a coil compression spring. Is formed.

The thin plate forming member 7 has a range 10 which extends radially outward in the axial direction, and in this range, an endless forming part 11 for a drive belt is provided.

The sheet metal forming member 7 transitions at one end into a radial range 12, which is connected radially inwardly to a shell-shaped range 13 which encloses the energy store 9. This range forms an annular curved portion 14 into which the power storage device 9 is inserted.

The shell-shaped area 13 is the outer axial area 1
It has an axial extension 15 which extends within the axial structural space bounded by 0 and which is radially inward and extends away from the bend 14.

The axial additional portion 15 receives the rolling bearing 16 inside, and the input member 3 and the output member 4 of the belt wheel 1 are rotatably supported via the rolling bearing 16.

The sheet metal forming member 6 is fixed to the radial region 12 of the sheet metal forming member 7 via an outer edge region 17, that is, via a welded joint 18 extending over the entire circumferential direction.

The welded joint 18 is manufactured by laser welding. On the further inner side in the radial direction, the sheet metal forming member 6 has a curved region 19 which covers the energy store 9 in the radial direction and which is a shell-shaped region 13 of the sheet metal forming member 7.
Together with this it forms a receiving part 8 for a power storage device 9.

The receiving part 8 is at least partially filled with a pasty medium, for example grease.

The input member 3 of the drive disk 1 has an axially extending region 20 which is the end which faces the outer thin sheet forming member 6 in the axial direction and which extends outward in the radial direction. It has moved into range. At the other axial end, the axial region 20 is connected to a radially inwardly directed annular flange region 22.

A radial range 21 outside the input member 3 forms a bulge 23 for supporting or loading the coil compression spring 9. The inner radial extent 22 is connected to an input member 24 of a damping mechanism 25.

Such a connection may be made, for example, by rivet connection as shown in the lower half of FIG. 1 and / or by screw connection as shown in the upper half of FIG.

The inner race 26 of the rolling bearing 25 is received on the outer peripheral surface of the axial range 20. In this case, since the rolling bearing 16 is received in the end portion range 20a of the damping mechanism 25 facing the input member 24, the rolling bearing is secured in the axial direction between the step portion 20b in the axial range 20 and the input member 24. To be done.

In order to load the end areas of the energy store 9, both lamellas 6, 7 are pushed axially as pockets 26, 27 extending between the end areas of two adjacent energy stores 9. It has a deformed portion.

The input member 24 of the damping mechanism is formed in a cup shape or a disk shape and has a cushioning body 28 on the outside.
To support the damping mass 29. Buffer 28
Is constituted by a torsional vibration damper formed of an elastomer ring provided between the input member 24 and the damping mass 29 of the damping mechanism.

The damping mass 29 is provided outside the belt wheel 1 so as to extend in the axial direction of the additional portion 10 in the axial direction and to directly form a slight gap 30 so as to be adjacent to the additional portion.

The input member 24 of the cup-shaped damping mechanism drives the belt wheel 1 or the shaft of the unit driven by the belt wheel 1 has the cup-shaped or disk-shaped recess 31 of the damping mechanism 25 as an axis. Are arranged so that they are driven in a direction or open in a direction away from the driving unit.

Radial range 22 of the input member 3 of the shock absorber
Is fixed to the bottom of the cup-shaped recess 31. The damping mechanism input member 24 has a radially inner boss 32 which is used for drivingly coupling the damping mechanism 25 or the belt wheel to the shaft.

The thin plate forming member 7 is formed in a C-shape or a U-shape when viewed in cross section. A damping mass 29 as well as an axially extending edge 34 of the input member 24 of the damping mechanism are received in an annular chamber 33 formed by the sheet metal forming member 7.

By engaging the damping mechanism 25 and the belt wheel 1 with each other in the axial direction, a space-saving structure of the buffer unit is obtained.

The rolling bearing 16 and the vibration damping device 5 are received in a disk-shaped recess 31. In this case, the rolling bearing 16 is arranged at least approximately at the axial height of the fixing point 35 between the input member 3 of the shock absorber 5 and the damping mechanism 25. In the illustrated embodiment, the fixing points are provided radially inside the rolling bearing 16.

The rolling bearing 16 is arranged adjacent to the vibration damping device 5 or the power storage device 9 when viewed in the axial direction,
In this case, the accumulator is provided outside the rolling bearing 16 in a substantially radial direction.

Axial range 20 of the input member 3 of the shock absorber 5
And the inner radial extent 22 forms or limits a cup-shaped recess 36 for accommodating the head 37 of the fixing screw 38. As is particularly apparent from FIG. 2, the axial range 20 has a forming part as a radial push-in deformation 39 for the assembly tool.

When the fixing screw 38 is tightened, the rotation of the belt wheel 1 is prevented via the push-in deforming portion 39.

Furthermore, the axial extent 20 is used to limit the annular chamber 8 radially inward. The closing of the chamber 8 radially inward is ensured by the provision of a relatively small axial gap 40 between the radially inner region of the sheet metal forming member 6 and the flange region 21.

The cup-shaped recess 36 is a cover cap 41.
Closed by. The cover cap 41 is the shock absorber 5.
Is supported by the output member 4. For this purpose, the axially outer thin plate molding 6 projects radially inward so as to provide a free edge region 6a to which the cover cap 41 is fixed.

In the embodiment, the cover cap 41 is made of a deformable material, for example plastic.

On the outer peripheral surface of the cover cap, there is formed a U-shaped region 41a which is open outward in the radial direction, and this region surrounds the edge region 6a of the thin plate forming member 6 like a clamp.

The cover cap 41 is attached after the unit consisting of the belt wheel and the damping mechanism 25 is attached to the driven or driven unit. The cover cap 41 prevents dust from reaching the cup-shaped recess 36 or via the gap 40 into the annular chamber 8 which is at least partially filled with the viscous medium.

In addition, the closing of the cup-shaped recess 36 reduces the noise emission when fixing the unit to the internal combustion engine.

In order to reduce the thermal load on the unit consisting of the belt wheel and the damping mechanism 25, an axial cutout 42 is provided in the bottom area of the input member 24 of the damping mechanism. The notches 42 can be formed vertically in the circumferential direction and are evenly distributed in the circumferential direction. The notch 42 is provided on the inner side in the radial direction of the shock absorber 28 of the damping mechanism.

Axial notches 43 are likewise provided outside the chamber 8 in the radial direction or outside the closure, which serves as the welded joint 18 provided between the two sheet-metal forming members 6, 7. This axial cutout is formed vertically long in the circumferential direction, as is apparent from FIG. 2 showing the cutout 43.

In FIG. 2, only one such cooling notch 43 is shown. However, preferably a large number of such cutouts 43 can be distributed, for example, evenly in the circumferential direction between the components 4, 16.

In the case of a rotating device, the cooling air has a damping mechanism 2
A cutout 4 which advantageously acts like a fan from the outer surface of 5
Introduced in 2. In this case, this cooling air is guided between the cup-shaped area 34 and the shock absorber 5 or the shell-shaped area 13 of the sheet metal molding 7 and flows radially outwards via the notches 43 and the slits 30. ..

Such ventilation avoids overheating of the buffer body 28, which is made of elastomer in particular.

A suitable air cooling type is also used in the embodiment according to FIG.

The unit shown in FIG. 3 is similar to that shown in FIGS.
The unit shown in the drawing is a unit in which the cup-shaped or disk-shaped recess 131 of the input member 124 of the damping mechanism that receives the rolling bearing 116 and the vibration damping device 105 of the belt wheel 101 is driven or driven in the axial direction. The difference is that it is open in the direction of.

That is, the vibration damping device 105 is located between the unit 1 which is driven or driven in the axial direction and the input member 124 of the damping mechanism 125 formed in a cup shape.

Inside the annular recess 131 in the radial direction, the input member 124 of the damping mechanism 125 has the central axial recess 1
50, the recess is open axially in the opposite direction.

The outer damping mass 129 is provided in a substantially radial manner within the axial extent 110 provided with the shaped part 111.

The rolling bearing 116 is arranged between the output member of the shock absorber and the input member 124 of the damping mechanism 125. The shock absorber input member 103 comprises a damping mechanism 12 via a fixing member in a manner similar to that described in connection with the input member 3 and the damping mechanism 25 according to FIGS.
5 input member 124.

The range inside the input member 103 of the shock absorber in the radial direction is the boss 13 of the input member 124 of the damping mechanism 125.
2 is determined.

The power store 109 is housed in the chamber 108 in a manner similar to that described in connection with FIGS. 1 and 2.

In the embodiment shown in FIG. 3, the rolling bearing 116
Are arranged at least approximately at the same axial height as the rotationally elastic damper 105.

The output member 104 of the belt wheel 101 is also formed by two thin plate forming members 106 and 107. In this case, the thin plate forming member 1 having the forming portion 111 is provided.
07 has a flange area 112 with a load area 127 for the energy store 109, which extends radially inward from the substantially outer axial extension 110.

The second sheet metal forming member 106 is formed axially in the direction of a radial range 112 in a C-shape or a U-shape, in which case the outer axial range 106a guides the energy storage device 109 and the radius. The directional support and the inner axial extent 106b is used to support the rolling bearing on the damping member input member 124.

Between the input member 103 and the inner region of the thin plate molding member 107 in the radial direction, there is provided a disc spring or a seal as a diaphragm 151 which is clamped and fixed in the axial direction.

The thin plate molding member 106 is housed in the annular recess 131 of the input member 124 of the damping mechanism.

For another advantageous embodiment applied in connection with the present invention, see West German application P4126209.3, which is consistent with the subject matter of the present invention. With respect to this content, the design, dimensioning, and arrangement form of the power storage devices 9, 109 correspond.

The invention is not limited to the illustrated embodiments, but in particular in connection with various embodiments of the invention and / or
Alternatively, it also includes variations obtained by combining the individual features or components described in connection with West German application P4126209.3.

Further, the features or functional forms themselves described in the illustrated embodiments may individually form independent inventions.

[Brief description of drawings]

FIG. 1 is a sectional view of a belt wheel having a damping mechanism.

FIG. 2 is a view seen in the direction of arrow II in FIG.

FIG. 3 is another sectional view of the belt wheel according to the present invention.

[Explanation of symbols]

 1,101 Belt wheel 3,24,103 Input member 4,104,124 Output member 5,105 Damper 6,7,106,107 Thin plate forming member 8 Receptor 9,109 Accumulator 10,20 Axial range 11 , 111 Molded part 12, 21, 22, 112 Radial range 13, 19, 41a Range 14 Curved part 15 Additional part 16, 116 Rolling bearing 23 Overhang part 25, 125 Damping mechanism 26 Inner race 28 Buffer member 29, 129 Damping mass 31, 36, 131 Recess 35 Fixed part 41 Cover cap

Front page continuation (72) Inventor Peter Klein Edenkoben Riedburgstrasse 6 (72) Inventor Stefan Valtwies Otterweier Blumenstraße 4

Claims (21)

[Claims] 1. A drive disc for a belt drive or a chain drive, in particular for driving an auxiliary unit of an internal combustion engine, the drive disc being fixed on a shaft such as the drive shaft of the internal combustion engine, It has an input member and an output member rotatable relative to the input member, and these members are rotatably connected to each other via a buffer device having a pressure-store capable of being compressed in the circumferential direction, for example, a coil compression spring. A vibration damping mechanism having a damping mass, which is rotatably supported relative to each other via a bearing and is connectable to the same shaft as the drive disk via a shock absorber. In which the drive disc has a radially outwardly axially extending region with a profile for an endless drive member such as a belt or a chain, the radius of this region Drive disk, characterized in that the damping mass and the damping device are arranged inwardly, in which case the outer axial range, the vibration damping mechanism and the damping device are adapted to be fitted axially into one another. 2. The drive disk according to claim 1, wherein the damping mass and the damping device are arranged in an axial extension range of at least approximately the outer axial range. 3. The drive disk according to claim 1, wherein the annular damping mass is provided directly adjacent to the outer axial range and radially inward of this range. 4. A free space in which the input member of the damping mechanism provided radially inside the annular damping mass is configured like a cup and the damping device is formed by the input member of the damping mechanism in at least approximately the axial direction. 4. The drive disk according to claim 1, which is housed in the drive disk. 5. The input member of the damping mechanism is drivable by a shaft and carries the input member of the shock absorber.
The drive disk according to any one of items 1 to 4. 6. The fixing point between the drive disc and the input member of the damping mechanism is provided radially inward of the bearing portion between the shock absorber output member and the shock absorber input member of the drive disc. The drive disk according to claim 1. 7. The cup-shaped recess of the input member of the damping mechanism is opened toward the shaft end to which the input member of the damping mechanism is fixed, according to any one of claims 4 to 6. Drive disc. 8. A fixing point between the input member of the damping mechanism and the input member of the shock absorber and a rolling bearing between the output member and the input member of the shock absorber are provided at least at substantially the same axial height. The drive disk according to any one of claims 1 to 7. 9. A shock absorber having an outer axial range with a shaped part, an annular damping mass, a force store, and an output member of the shock absorber, in the order of radially outward to radially inward. 9. The drive disc according to claim 1, further comprising a bearing arranged between the input member and the input member. 10. The energy storage device according to claim 1, wherein the energy storage device is housed inside a substantially sealed casing, which casing is at least partially filled with a viscous medium, for example grease. The drive disk according to item 1. 11. A drive disc according to claim 10, wherein the casing is at least partly constituted by an output member of a shock absorber which supports a molding for the endless drive member. 12. The shock absorber output member comprises a sheet metal forming member having an axial addition with a radially outer, endless forming portion for the drive member. And radially inward, starting from one axial end of the appendage, forming an annular curve extending axially within the appendage for receiving and guiding the energy store. In this case, the thin plate forming member forms another sleeve-shaped additional portion on the inner side in the radial direction of the curved portion, and this additional portion forms a bearing seat for the outer race of the rolling bearing on the inner peripheral surface. The drive disk according to any one of claims 1 to 11, which is present. 13. Another thin plate forming member is provided,
The sheet metal forming member is connected radially outwardly to one sheet metal forming member and axially covers the curved portion of the sheet metal forming member to form an annular receiving part for the energy storage device. The drive disk according to claim 12, wherein 14. The sheet metal forming member has a push-in deforming portion, and the push-in deforming portion has a support portion for an end region of the energy storage device in the range of the annular receiving portion. Item 1
3. The drive disk according to item 3. 15. The input member of the shock absorber connected to the shaft has a radial load range, which load range engages between the energy stores in a circumferential direction. From 14
The drive disk according to any one of items 1 to 7. 16. The shock absorber input member has an axial extent that extends radially inward at one end and radially outward at the other end,
16. The drive disk as claimed in claim 1, wherein the drive disk is transitioned into a flange range having a load range for the energy store. 17. A drive disk according to claim 16, wherein the axial extent of the input member receives the inner race of the rolling bearing. 18. The drive disk according to claim 16 or 17, wherein the axial range of the input member is formed into a cup shape, and has a forming portion for an assembly tool when viewed in the circumferential direction. 19. The cup-shaped recess of the shock absorber input member is closed by a cover cap.
The drive disk according to any one of claims 1 to 18. 20. The drive disk of claim 19, wherein the cover cap is supported by the output member of the shock absorber. 21. The housing is closed by a cover cap, which can be attached to the input member of the shock absorber after mounting the drive disc on a suitable shaft. One of
The drive disk according to the item.