DE102008034805B3 - Coupling device for transmitting a rotary movement with spring element - Google Patents

Abstract

The invention relates to a coupling device (1) for transmitting a rotary movement, with a first coupling part (10) having a toothing (11) with a second, coaxially arranged coupling part (20), one with the toothing (11) of the first Coupling part (10) cooperating further toothing (21), with at least one spring element (30) for clamping between the two coupling parts (20, 23) in the circumferential direction, and with a pressure body (40) having a tooth flank (24) at least one Tooth (22) of the toothing (21) of the second coupling part (20) forms a splined connection, wherein the pressure body (40) with a radially acting radial spring force F _{R of} the spring element (30) presses against the tooth flank (24) and thereby a in Circumferentially acting tensioning force F _{U is} generated. The coupling device (1) is characterized in that the spring element (30) defines the position of the pressure body (40) in the circumferential direction.

Description

The The invention relates to a coupling device for transmission a rotational movement, with a first coupling part, a toothing has, with a second, arranged coaxially with the first coupling part Coupling part, the one with the teeth of the first coupling part has cooperating further teeth, and at least a spring element for clamping the two coupling parts in Circumferential direction.

A Such coupling device is used for example in a motor vehicle used to drive an internal combustion engine with a transmission of the motor vehicle connect to. The first coupling part can be used as a hub with a Internal teeth are formed while the second coupling part a Shaft with an external toothing represents, wherein the shaft with the external teeth in the internal toothing the hub can be moved axially. By the spring element which clamps the coupling parts in the circumferential direction, should avoid unwanted noise which are caused by vibration excitations by the internal combustion engine may arise in the coupling device (eg the clacking of the Teeth through Back and forth movement within the backlash, especially at idle).

From the DE 44 07 169 A1 a coupling device is known in which the first coupling part designed as a hub with internal teeth. The second coupling part has an external toothing corresponding to the internal toothing. In the hub two diametrically opposed radial slots are introduced with radially extending side surfaces. In a slot, a segment in the form of a sliding block is used in each case, wherein its mobility is limited in the circumferential direction by the side surfaces of the corresponding slot. The sliding block is provided at a radially inner end with an inner driving toothing, which is adapted to the external toothing of the second coupling part. On an outer peripheral surface of the sliding block has a circumferential groove for engagement of a slotted annular bending-form spring element, which presses the sliding blocks in an idling operation of the coupling device radially inwardly against the external toothing of the second coupling part. The driving teeth on the radially inner end of the sliding block thus has a plurality of teeth or generally formulated pressure body, which form a spline connection with a tooth flank of the teeth of the outer toothing of the second coupling part, wherein the sliding blocks and thus the teeth of the driving teeth with a radial spring force acting in the radial direction Press bending form spring element against the tooth flanks of the external toothing of the second coupling part while a force acting in the circumferential direction of the tensioning force is generated, which counteracts relative movements in the circumferential direction.

The structure of the coupling device of DE 44 07 169 A1 is comparatively complex and expansive.

The DE 10 2006 017 167 A1 discloses a coupling device having a first and second coupling part, each having a toothing. For bracing the teeth in the circumferential direction, a spring arrangement is provided, which is fastened to the first coupling part by means of a riveted joint. The spring arrangement has two separate pressure bodies, which bear on tooth flanks of two adjacent teeth of the toothing of the second coupling part. When the gears are rotated relative to each other, one of the pressure bodies is displaced or bent against a spring force in the circumferential direction, whereby the teeth are braced.

The DE 10 2006 048 653 A1 also discloses a coupling device with two toothed coupling parts, wherein between two engaged teeth, an arcuate spring element is provided, which extends in the axial direction. Upon rotation of the coupling parts to each other, the arcuate spring element is further compressed or relaxed, thereby clacking the teeth is reduced.

The EP 0 209 314 A1 discloses a coupling device with two coupling parts and a pressure body, which is guided radially in a first coupling part and is pressed by a spring radially against the toothing of a second coupling part. The pressure hull is stored with play in the first coupling part, which can lead to noise. A corresponding coupling device also discloses the US 1,967,052 ,

The US 4,303,149 discloses a coupling device, wherein the teeth of one of the two coupling parts is divided into segments which are pressed by seated in an annular groove spring against the teeth of the other coupling part.

The DE 30 38 647 discloses a coupling device in which a spring element, which is supported at two ends on a first coupling part, presses against a flat surface of the second coupling part, thereby bracing the two coupling devices against each other. For mounting the coupling device while the two coupling parts must be aligned in the circumferential direction.

The invention is based on the object, a coupling device with two coupling parts and provide with spring element to provide, which can be used in particular in a motor vehicle for connecting engine and transmission, which can be housed in a limited space, a noise of the coupling device by vibrations of the engine as possible avoids, is simple and easy to assemble.

The The object underlying the invention is with the feature combination according to claim 1 solved. Preferred embodiments can the dependent claims be removed.

According to claim 1, a coupling device is proposed in which the spring element the Position of the pressure hull sets in the circumferential direction without play, wherein the spring element radial forces, the on the pressure hull act on a first end and a second end divides, between which seen in the circumferential direction of the pressure body is arranged. The pressure body is supported doing so at a connection extending between the two ends of the spring element. The spring element exerts in the circumferential direction on the pressure hull a circumferential or tangential spring force. The position of the pressure hull is thus set in the circumferential direction without play, since it only against the tangential spring force of the spring element is possible, the pressure body in Move circumferential direction. A playful seat of the pressure hull in first coupling part and thus any noise by the given Game can thus be excluded.

According to the invention is a Rigidity of the spring element in the circumferential direction greater than a stiffness in the radial direction. The stiffness of the spring element in the circumferential direction can be more than twice or ten times greater as the stiffness in the radial direction. For rotations of the gears leads in the circumferential direction the pressure body in Essentially only a radial movement.

The Gearing of the first coupling part may be an internal toothing. Accordingly, the second coupling part is formed with an external toothing. It pushes the spring element the pressure body radially inward against the external teeth of the second coupling part. Alternatively, it is possible that the first coupling part as a toothing has an external toothing. In this case would the pressure body by the spring element radially outward against the internal teeth pressed the second coupling part become.

In the embodiment, in which the pressure body against the external teeth pressed the second coupling part is, the spring element in a radially inwardly open recess of the To fit toothing of the first coupling parts. The first coupling part can be a hub with complete be closed scope. The spring element is supported by walls of the Recess both in the circumferential direction and in the radial direction from the first coupling part.

The Spring element and / or the recess may be formed so that the spring element can be inserted axially into the recess. A different possibility is that spring element and / or to make the recess so that insertion in the radial direction into the recess is possible.

Of the pressure vessels can engage with the tooth flanks of two adjacent teeth Gearing of the second coupling part stand. The pressure body engages in a tooth gap between the two adjacent teeth. However, it is also possible that the pressure body on the tooth flank of only one tooth. For contact with the tooth flank only a tooth presses the spring element over the pressure body the toothing of the second coupling part relative to the toothing of the first coupling part in the circumferential direction such that the tooth flanks of Teeth of the Gearing of the first coupling part with the corresponding opposite tooth flanks the teeth the gearing of the second coupling part come into abutment.

at the embodiment, in which the pressure body in engagement with the tooth flanks of two adjacent teeth of Gearing of the first coupling part is, an orientation the toothings of the two coupling parts are achieved in such a way that the teeth do not abut each other on their flanks, but in the middle in the Gap of neighboring Teeth of the other gearing lie. Now, from this position of the teeth, the hereinafter referred to by the term "middle-middle" is applied to the coupling device torque, twist in the circumferential direction, the teeth to each other, whereby the Pressure body against the radial spring force is displaced radially and the tooth flanks come to the plant. Part of the torque between the first and second coupling part is thus on the spring element and a further part about transmit the tooth flanks.

An alignment of the teeth of the two coupling parts, in which the teeth of one toothing are located centrally in the tooth gaps of the other toothing ("center-center"), can be achieved in that the pressure body in the circumferential direction against the teeth of the toothing of the first coupling part without Offset is arranged. The pressure body is located in the circumferential direction at a point at which otherwise a tooth of the toothing of the first coupling part would be arranged. By the plant on the tooth flanks of two be neighboring teeth are thus aligned the teeth of the two coupling parts in the constellation "center-center". However, if the pressure body offset relative to the teeth of the teeth of the first coupling part in the circumferential direction, the teeth are braced so that the individual teeth flank abut edges ("flank edge"), even if the pressure body with the tooth flanks of two adjacent teeth in Intervention is.

Of the pressure vessels can be a wedge-shaped or tooth-shaped Cross-section, with the tooth profile of the teeth of the toothing of the second coupling part corresponds. As a result, punctiform surfaces can be avoided that lead to voltage peaks to lead.

In a preferred embodiment extends the pressure body in the axial direction and has at least one tapered frontal end on. The rejuvenated The front end facilitates the axial nesting of the teeth the coupling parts. The front end can thus appropriate Have chamfers, so that the pressure hull does not block the axial telescoping.

The front end of the pressure hull can in the axial direction opposite be offset back the toothing of the first coupling part. When axial Intertwining the gears, the gears would first in Engage without the pressure body with the teeth of the second Coupling parts in contact comes. This allows first and second coupling part without Resistance by the spring element axially partially push each other. Upon further telescoping push the teeth of the teeth of the second Coupling part of the pressure hull against the force of the spring element radially outward (or after inside), whereby by the wedge effect between pressure body and the tooth flanks of the teeth one Alignment of the gears in the circumferential direction and a tension take place in the circumferential direction.

The Spring element may comprise a leaf spring. The leaf spring can be shaped so that they both the radial spring force as also provides the tangential spring force of the spring element.

In a preferred embodiment the pressure body one piece formed on the spring element. Form spring element and pressure body thus a single piece, in an assembly step in the recess of the toothing of the first coupling part leaves.

Preferably the spring element has a holding wing, which is for axial fixing the spring element is used on the first coupling part. Thus helps the retaining wing to avoid that when nesting the teeth of the Coupling the spring element and, as far as the one-piece design is based is placed, the pressure body axially from the desired Position is moved.

The Spring element may be made of sheet metal. In the integrally molded pressure vessels It can be a sheet metal exhibition, which consists of a Level of the leaf spring protrudes.

Preferably are arranged on the first coupling part a plurality of spring elements, the are distributed in the circumferential direction so that their radial forces related cancel on the central axis of the coupling device. For example can be provided two spring elements which are at an angle of 180 ° to each other are arranged. In an arrangement with three elements, the angular distance is between adjacent spring elements 120 °, with four elements preferably 90 °. By Such an arrangement of the spring elements, the coupling parts well centered to each other, even if the coupling device no torque transfers. Of the exact angular distance of the spring elements is essentially through determines the position of the teeth adjacent to the respective spring element. Depending on the number of teeth in the circumferential direction and their distance from each other, the angular distance the spring elements of the exact values 180 °, 120 °, 90 °, etc. more or less strong differ.

Based of the embodiment shown in the drawing, the invention explained in more detail. It demonstrate:

1 in perspective view an embodiment of a first coupling part in a perspective view;

2 a detail of a coupling device in a perspective view;

3 the coupling device of 3 in section in longitudinal section;

4 in perspective view a spring element; and

5 a part of the toothing of the first coupling part with the spring element in plan view.

1 shows a perspective view of a first coupling part 10 a coupling device 1 , in the 2 is shown in section and next to the first coupling part 10 a second coupling part 20 includes. The coupling device 1 further comprises a plurality of spring elements 30 of which one in 4 is shown in perspective. The first coupling part 10 is as a hub with an internal toothing 11 educated. The internal toothing 11 has a variety of individual inward teeth 12 on. These teeth 12 stand in the assembled state of the coupling device 1 with teeth 22 an external toothing 21 of the second coupling part 20 engaged. The coupling parts 10 . 20 are coaxial to a rotation axis 2 the coupling device 1 arranged. The coupling device leaves in the axial direction, ie in the direction of the axis of rotation 2 , a relative displacement of the coupling parts 10 . 20 to. For example, the coupling device can serve to connect the crankshaft of an internal combustion engine in a motor vehicle with a transmission of the motor vehicle.

How the particular 2 and also the 3 , which shows a section of the coupling device in longitudinal section, can be removed, is the spring element 30 in a recess 13 the internal toothing 12 arranged. At the point of the recess 13 missing several teeth (for example, three to five teeth) of the internal teeth 12 , The recess 13 extends in the circumferential direction of the first coupling part 10 and has two opposing boundary walls 14a . 14b on (cf. 3 ). Between the boundary walls 14a . 14b runs a slightly curved recess bottom 15 , The boundary walls 14a . 14b are to a midline 31 of the mirror-symmetrically constructed spring element 30 slightly inclined, being an intersection of an imaginary extension of the boundary walls 14a . 14b outside the first coupling part 10 lies.

In 3 are of the second coupling part 20 essentially only two adjacent teeth 22a . 22b shown, between which a tooth gap 23 given is. In the tooth gap 23 engages the pressure hull 40 the one-piece with the spring element 30 is trained. The one-piece is especially in 4 to recognize.

The spring element 30 has two leaf feather wings 32a . 32b on, in the installation position of the spring element 30 with its folded ends 33a . 33b in the recess 13 sit, with the bevelled ends 33a . 33b at the boundary walls 14a . 14b support and thus the position of the spring element 30 set in the circumferential direction to note that 3 not the installation position of the spring element 30 in the recess 13 shows, but the spring element 30 although in its intended position, but not with deformed leaf feather wings 32a . 32b in the installation position of the spring element 30 would be slightly bent.

In installation position of the spring element 30 would the pressure hull 40 with its sloping flanks 41a and 41b on the opposite flanks 24 the teeth 22a . 22b issue. Here are the leaf feather wings 32a . 32b deformed and press the pressure body 40 with a radially inwardly directed radial spring force F _R against the tooth flanks 24 the teeth 22a . 22b , The pressure hull 40 and the teeth 22a . 22b form a wedge connection, through which the radially acting force F _{R is converted} into a circumferentially acting forces F _U. Would now the second coupling part 20 relative to the first coupling part 10 To be deflected in the circumferential direction, thereby resulting from the radial spring force F _R and the spline circumferential forces F _{U must be} overcome. The forces F _U thereby cause a teeth clacking due to vibrational excitations of the engine does not take place because the coupling parts 10 . 20 can be moved in the circumferential direction only against a force. At a tooth flank angle α equal to 30 °, the circumferential forces F _U are approximately twice as great as the radial spring force F _R due to the wedge effect.

The leaf feather wings 32a . 32b not only provide a radial spring force F _R , but also for a position fixing of the pressure hull 40 in the circumferential direction. The spring element 30 exerts on the pressure hull 40 a tangential spring force that centers it on the central axis 31 holds. The tangential spring force is greater than the radial spring force F _R and also greater than the circumferential force F _U.

The pressure hull 40 is about the spring element 30 based on the first coupling part 10 arranged so that when unloaded coupling device 1 (transmitted torque equal to zero or very small) the teeth 12 of the first coupling part 10 in the middle of the tooth gaps 23 the second coupling part 20 lie. Will now through the second coupling part 20 a torque in the coupling device 1 initiated, with the torque in the representation of the 3 clockwise, so the second coupling part twists 20 based on the first coupling part 10 clockwise until the teeth 22 of the second coupling part 20 on corresponding opposite flanks of the teeth 12 of the first coupling part 10 issue. At the relative rotation of the coupling parts 10 . 20 becomes the pressure body 40 pressed against the radial spring force F _R radially outward. Now takes the guided by the coupling device torque off again, the radial spring force F _R is sufficient again, the pressure body 40 by the spring element 30 move radially inward again, eliminating the two gears 11 . 21 be aligned in the circumferential direction, so that the teeth of the two Verzahnun gene 11 . 21 lie centrally in the corresponding gaps of the other teeth.

How the particular 4 can be removed, the spring element 30 with the integrally formed pressure body 40 a leaf-shaped retaining wing 34 on, which serves to the spring element 30 based on the first coupling part 10 to fix in the axial direction. The retaining wing 34 lies in the installation position of the spring element 30 on the teeth 12 the internal toothing 11 of the first coupling part 10 on the front side, directly at the recess 13 are arranged. The retaining wing 34 lies in a plane which extends perpendicular to the plane in which substantially the leaf feather wings 32a . 32b lie. Again 1 can be removed, the axial position of the spring element on the one hand by the end faces of the teeth 12 fixed, on the other hand by a circular end face 16 at the retaining wing 34 is also present.

5 shows the spring element 30 and the pressure body formed thereon 40 and a section of the internal toothing 11 of the first coupling part 10 in the top view. It can be seen that leaf feather wings 32a . 32b each from their end 33a . 33b in the direction of the central axis 31 of the spring element 30 increase in width. A frontal end 42 of the pressure hull 40 is formed with curves or chamfers, the axial telescoping of the teeth 11 . 21 facilitate. In addition, the front end 42 opposite the front ends 16 the teeth 12 set back the toothing, so that the axial telescoping of the teeth 11 . 21 first the teeth 12 . 22 the gears 11 . 21 come into engagement without that a spring force of the spring element 30 counteracts Only with further axial telescoping is the pressure body 40 radially against the radial spring force F _{R of} the spring element 30 pushed outwards, whereby, as already described above, a tension of the coupling parts 10 . 20 in the circumferential direction and an orientation "center-center" takes place.

1

coupling device

2

axis of rotation

10

first coupling part

11

internal gearing

12

tooth

13

recess

14

Boundary wall ( 14a . 14b )

15

recess bottom

16

front

20

second coupling part

21

external teeth

22

Tooth ( 22a . 22b )

23

gap

24

tooth flank

30

spring element

31

central axis

32

Leaf feather wings ( 32a . 32b )

33

The End ( 33a . 33b )

34

retaining wings

40

pressure vessels

41

Flank ( 41a . 41b )

42

frontal The End

Claims (15)

Coupling device ( 1 ) for transmitting a rotary movement, - with a first coupling part ( 10 ), which is a gearing ( 11 ), - with a second, coaxially arranged coupling part ( 20 ), the one with the toothing ( 11 ) of the first coupling part ( 10 ) cooperating further gearing ( 21 ), - with at least one spring element ( 30 ) for the tension between the two coupling parts ( 20 . 23 ) in the circumferential direction, wherein the spring element has a first end ( 33a ) and a second end ( 33b ) for supporting on the first coupling part ( 10 ), and - with a pressure body ( 40 ), which with a tooth flank ( 24 ) at least one tooth ( 22 ) of the gearing ( 21 ) of the second coupling part ( 20 ) forms a splined connection, wherein the pressure body ( 40 ) with a radially acting radial spring force F _{R of} the spring element ( 30 ) against the tooth flank ( 24 ) and thereby a circumferentially acting tensioning force F _{U is} generated, wherein the pressure body ( 40 ) in the circumferential direction between the first end ( 33a ) and the second end ( 33b ) is arranged, and wherein the spring element ( 30 ) the position of the pressure hull ( 40 ) is set in the circumferential direction without play, characterized in that the spring element ( 30 ) acting on the pressure body radial forces to the first end ( 33a ) and the second end ( 33b ) transmits, wherein the pressure body at one between the first end ( 33a ) and second end ( 33b ) extending connection of the spring element ( 30 ) is supported. Coupling device ( 1 ) according to claim 1, characterized in that the spring element ( 30 ) in the circumferential direction of the pressure body ( 40 ) directed tangential spring force exerts. Coupling device ( 1 ) according to claim 1 or 2, characterized in that a stiffness of the spring element ( 30 ) in the circumferential direction is greater than a stiffness in the radial direction. Coupling device ( 1 ) according to one of claims 1 to 3, characterized in that the Ver toothing ( 11 ) of the first coupling part ( 10 ) is an internal toothing. Coupling device ( 1 ) according to one of claims 1 to 4, characterized in that the spring element ( 30 ) in a recess ( 13 ) of the gearing ( 11 ) of the first coupling part ( 10 ) sits. Coupling device ( 1 ) according to claim 5, characterized in that the spring element ( 30 ) axially in the recess ( 13 ) can be inserted. Coupling device ( 1 ) according to one of claims 1 to 6, characterized in that the pressure body ( 40 ) in engagement with the tooth flanks ( 24 ) of two adjacent teeth ( 22a . 22b ) of the gearing ( 21 ) of the second coupling part ( 20 ) stands. Coupling device ( 1 ) according to one of claims 1 to 7, characterized in that the pressure body ( 40 ) in the circumferential direction relative to the teeth ( 12 ) of the gearing ( 11 ) of the first coupling part ( 10 ) is arranged offset. Coupling device ( 1 ) according to one of claims 1 to 8, characterized in that the pressure body ( 40 ) has a wedge-shaped or tooth-shaped cross-section. Coupling device ( 1 ) according to one of claims 1 to 9, characterized in that the pressure body ( 40 ) extends in the axial direction and at least one tapered front end ( 42 ) having. Coupling device ( 1 ) according to claim 10, characterized in that the front end ( 42 ) of the pressure hull ( 40 ) in the axial direction relative to the toothing ( 11 ) of the first coupling part ( 10 ) is reset. Coupling device ( 1 ) according to one of claims 1 to 11, characterized in that the spring element ( 30 ) comprises a leaf spring. Coupling device ( 1 ) according to one of claims 1 to 12, characterized in that the pressure body ( 40 ) in one piece on the spring element ( 30 ) is formed. Coupling device ( 1 ) according to one of claims 1 to 13, characterized in that the spring element ( 30 ) a retaining wing ( 34 ), which for the axial fixing of the spring element ( 30 ) on the first coupling part ( 10 ) serves. Coupling device ( 1 ) according to one of claims 1 to 14, characterized in that the spring element ( 30 ) can be produced from sheet metal.