WO2018014889A1

WO2018014889A1 - Splined joint

Info

Publication number: WO2018014889A1
Application number: PCT/DE2016/200335
Authority: WO
Inventors: Andreas Matysiak; Achim HAGMAYER; Heiko Rosenfeld
Original assignee: Schaeffler Technologies AG & Co. KG
Priority date: 2016-07-21
Filing date: 2016-07-21
Publication date: 2018-01-25

Abstract

The invention relates to a splined joint, in particular for a drive train of a motor vehicle, having two parts, which are arranged about an axis of rotation (d) and have first and second toothing regions (2) forming a rotational connection which is preloaded in the circumferential direction. The first toothing region (2) is formed from two toothing elements (3, 4) with first and second toothings (6, 7) which are phase-shifted in the circumferential direction. The toothing elements (3, 4) are connected to each other by means of an elastomer body (5) such that they can be twisted to a limited extent, and the first and second toothings (6, 7) are held on a third toothing of the second toothing region, forming a preloading force, effective in the circumferential direction, of the elastomer body (5). To simplify the formation of the preloading during the process of joining the toothing regions (2), the first and second toothings (6, 7) have, over at least a portion, different pitches relative to the axis of rotation (d).

Description

splines

The invention relates to a spline, in particular for a drive train of a motor vehicle with two arranged around a rotational axis components with a circumferentially biased rotational closure with each other forming first and second toothing regions, wherein the first toothed region is formed of two toothed elements with circumferentially phase-shifted first and second teeth, the Gear elements by means of an elastomeric body are connected to each other limited rotatably and the first and second teeth are added to form a circumferentially effective biasing force of the elastomeric body on a third toothing of the second toothing region.

A generic spline is known from the two unpublished German patent applications no. 10 2014 208 273.0 and 10 2014 226 430.8, the disclosure of which is hereby fully incorporated in the application known. In this case, a first toothed region is provided on a hub part arranged about an axis of rotation, which has a first toothed element which forms a rotational connection with a toothed region of a shaft with a third toothed element via which the moment to be transmitted via the spline toothing is essentially transmitted. In order to prevent toothing clatter of the spline, a second toothed element is elastically and limited rotatably connected to the hub part by means of an elastomer body. The second toothing element has a second toothing modeled on the first toothing, which is slightly inclined relative to the position of the first toothing about the axis of rotation is arranged out of phase, as long as the hub part and shaft are not joined. During the joining of the splines, the first and second teeth are in phase rotated against the action of the modulus of elasticity and pushed onto the third teeth of the shaft, so that the two teeth of the first toothed area braced against the teeth of the second toothed area and thus avoid gearing rattling.

The object of the invention is the development of a generic spline. In particular, object of the invention to simplify the installation of such a connector.

The object is solved by the subject matter of claim 1. The dependent claims give advantageous embodiments of the subject matter of claim 1 again.

The proposed spline is used in particular in a drive train of a motor vehicle, the torque transmission between two components such as drive train components, wherein during assembly, the connector is joined by axial displacement of the components. The two components arranged about a rotation axis form a rotationally prestressed rotation in the circumferential direction. For this purpose, a first and on the other component, a second toothing region are provided on the first component. The first toothed region is formed from two axially spaced toothed elements with circumferentially phase-shifted first and second toothings. The toothed elements are connected by means of an elastomeric body with each other elastically limited rotatable. The first and second teeth are added to form a circumferentially effective biasing force of the elastomeric body on a third toothing of the second toothed area. By the set Bias is avoided by a tolerances of the components caused gearing rattling. In order to perform the joining of the components and their teeth easier to form the bias, the first and second teeth on at least a portion of different slopes with respect to the axis of rotation. Due to the different pitch of the teeth, the first toothed element is rotated relative to the second toothed element without additional tools during the joining operation of the components as soon as they are pushed onto the toothing of the third toothed element.

The first and second toothings are aligned with one another so that at the beginning of the joining process, the third toothing in the first toothing can be completely pushed through and inserted into the second toothing. Due to the other pitch of the second toothing, the second toothed element is rotated to a limited extent against the action of the elastomer body and the pretensioning of the teeth of the first and second toothing is produced in relation to the third toothing. In this case, the first toothing and the third toothing can be formed as a straight toothing formed axially relative to the axis of rotation, for example as involute toothing. The second toothing may be formed as helical toothing over at least part of its axial extension. For example, the second toothing is designed as a straight toothing with import bevels, wherein the import bevels cause a rotation of the second toothing element relative to the first toothed element, as soon as the third toothing is pushed onto the insertion bevels.

Alternatively, the first toothing may have a zero pitch and the second toothing may have a non-zero pitch with respect to the axis of rotation. This slope of the second toothing is designed so that the intended rotation of the first and second toothed elements is finally achieved only after the third toothing has passed through the second toothing. As a result, the rotation can be extended to a longer Axialweg and thus the joining force can be reduced.

It may be provided that the rotational closure between the first and third teeth take over substantially all of the torque of the spline to be transmitted, while the second teeth only provides the biasing force of the first toothing region relative to the second toothed region. It can therefore be provided to arrange on the first toothing element a larger number of teeth than a number of teeth on the second toothing. For example, 15 to 25, preferably between 20 and 24 teeth may be provided on the first toothing, which engage distributed over the circumference in corresponding tooth gaps of the third toothing rotationally. In order to reduce the friction, in particular during the joining process between the second and third toothing, the number of teeth of the second toothed element may be between one and six, preferably three.

It can further be provided to provide a few, for example, three teeth of the second toothing, which have different recesses relative to the end face of the second toothed element. In this way, the complementary teeth of the third toothing come into contact successively during the joining operation, so that an asymmetrical axial and rotational loading of the second toothed element occurs, which can facilitate the rotation of the second toothed element. According to an advantageous embodiment, the spline is formed as a shaft / hub connection. In that regard, one component is designed as a shaft and the other component as a hub part. Such a shaft / hub connection can be provided in a drive train, for example, between a torsional vibration damper such as dual mass flywheel and a dual clutch, wherein the output part of the torsional vibration damper, for example, a flange for acting on the spring means and / or a pendulum flange of a centrifugal pendulum connected to the hub part or in one piece can be formed with this. It has proven to be advantageous if the first toothed portion is provided on the hub part and the second toothed portion is provided on a shaft. For this purpose, the hub part can have on the front side of the hub a ring part, which is vulcanized onto the end face of the hub, so that an elastomeric body is formed between hub and ring part.

The invention will be explained in more detail with reference to the Ausführungsbei- illustrated in the figures 1 to 5 games. Showing:

1 shows a hub part of a spline in section,

FIG. 2 shows the hub part of FIG. 1 in a 3D view;

FIG. 3 shows a detail of the hub part of FIGS. 1 and 2,

Figure 4 is a partial 3D view of a relative to the hub portion of Figures 1 to

3 modified hub part

and

FIG. 5 shows the second toothed element of the hub part of FIG. 4 in 3D view.

FIGS. 1 and 2 show, in a 3D view and in section, the hub part 1 of a cited prior art in a drive train of a motor vehicle. zeugs trained splines between two components. In this case, the hub part 1 integrated, for example, in a torsional vibration damper is designed as a first component, while a shaft or a shaft journal, not shown, of a double clutch forms the second component, so that a shaft / hub connection is formed, for example, between a torsional vibration damper and a double clutch , Accordingly, the hub part 1 has the first toothed region 2 with the first and second toothed elements 3, 4. The first toothed element 3 and the second toothed element 4 designed as a ring part are connected elastically, in particular to a limited extent, to one another at the end face of the toothed region 2 by means of the elastomer body 5. The elastomeric body 5 can be formed by vulcanization of the two toothed elements 3, 4 to each other.

The toothed elements 3, 4 each contain a first and second toothing 6, 7 designed as internal toothing, which form a rotational lock with the second toothed region of the shaft with the third toothed element with the third toothing formed as external toothing (not shown).

The slopes of the teeth 6, 7 are formed differently. The first toothing 6 is formed with respect to the axis of rotation d as a straight toothing, while the toothing 7 is formed as a helical toothing with a predetermined angle to the axis of rotation d.

In the exemplary embodiment shown, a join of the shaft in the toothed region 2 is provided by the first toothing 6 of the first toothed element 3 in the toothing 7 of the second toothed element 4. In this case, with reference to the detail of FIG. 3, first of all the rotational closure between the first toothing of the toothed element 3 is achieved by axial immersion of the third toothing. tion of the shaft in the first gear element 3 justified. When abutting the third toothing on the ramps 9 of the teeth 8 of the second toothing 7, the second toothed element 4 is rotated against the first toothed element 3 against the action of the elastomer body 5. As a result, the teeth of the shaft and the first gear 6 are biased against each other in the circumferential direction preferably in the thrust direction of the torque, so that in the train operation of the drive train with the connector direct contact of the teeth of the first gear 6 is given to the teeth of the shaft. When thrust reversing the backlash is attenuated attenuated under the action of the elastomer body 5 and the teeth of the teeth come into contact with each other on the opposite tooth flanks. At idle torque transmitted via the spline, for example, drag torque and the like are preferably unable to overcome the bias of the elastomeric body 5, so that a Verzahnungsklappern is prevented when idling the drive train.

In contrast to the hub part 1 of FIGS. 1 to 3, the hub part 1 a shown in partial detail in FIG. 4 shows a second toothed element 4a with a toothing 7a with only three circumferentially arranged teeth 8a, 10a, 11a. The teeth 8a, 10a, 11a are inclined relative to the straight-toothed toothing 6a of the toothed element 3a and, corresponding to the teeth 8 of FIG. 3, cause the toothed element 4a to rotate relative to the toothed element 3a during the joining of the shaft and the hub part 1a. The rotation takes place asymmetrically with respect to the axis of rotation d and over the circumference successively on the teeth 8a, 10a, 11a. For this purpose, the teeth 8a, 10a, 11a - as shown in FIG. 5 - have a different length in the axial direction. The tooth 8a has the axial width of the toothing element 4a, for example 5 mm. The tooth 10a has over the width of the toothed element 4a, the axial recess 12a and thus only an axial width of, for example, 4.6 mm. The tooth 1 1 a is further shortened axially by the recess 13 a and for example 4.2 mm long. As a result, apart from the rotation, there is a tumbling movement of the toothed element 4a during the joining process of the shaft. In this way, the joining and twisting process of the toothed element 4a is simplified by the radial deflection of the toothed element 4a in contact with a complementary tooth of the shaft. For example, the friction is reduced and the joining forces are lowered.

LIST OF REFERENCE NUMBERS

1 hub part

1 a hub part

toothed area

3 toothing element

3a toothing element

toothed element

4a toothing element

5 elastomeric body

6 toothing

6a toothing

7 toothing

7a toothing

8 tooth

8a tooth

9 ramp

10 tooth

1 1 a tooth

12a return

13a return

d rotation axis

Claims

claims

1 . Connecting toothing in particular for a drive train of a motor vehicle with two components arranged around an axis of rotation (d) with a first and second toothing areas (2) forming a torsionally closed circuit in the circumferential direction, wherein the first toothed area (2) consists of two toothed elements (3, 3a, 4, 4a) is formed with circumferentially phase-shifted first and second teeth (6, 6a, 7, 7a), the toothed elements (3, 3a, 4, 4a) by means of an elastomeric body (5) are rotatably connected to each other limited and the first and second toothings (6, 6a, 7, 7a) are accommodated to form a circumferentially effective biasing force of the elastomeric body (5) on a third toothing of the second toothed area, characterized in that first and second toothing (6, 6a, 7, 7a) Have over at least a portion of different slopes with respect to the axis of rotation (d).

2. spline toothing according to claim 1, characterized in that the first toothing (6, 6 a) and the third toothing as axially to the rotation axis (d) formed Geradverzahnungen and the second toothing (7, 7 a) at least over part of its axial extent as helical toothing are formed.

3. spline according to claim 1 or 2, characterized in that in non-prestressed state of the elastomeric body (5) the teeth (6, 6a, 7, 7a) of the interconnected first and second toothing elements (3, 3a, 4, 4a) whose faces are aligned with each other.

4. spline according to one of claims 1 to 3, characterized in that the second toothing is formed as a straight toothing with chamfers.

5. spline according to one of claims 1 to 3, characterized in that the first toothing (6, 6a) has a slope zero and the second toothing (7, 7a) have a slope not equal to zero with respect to the axis of rotation (d).

6. spline according to one of claims 1 to 5, characterized in that the number of teeth of the first toothing (6a) is greater than the number of teeth (8a, 10a, 1 1 a) of the second toothing (7a).

7. spline according to claim 6, characterized in that the number of teeth (8a, 10a, 1 1 a) of the second toothed element (4a) is between one and six.

8. spline toothing according to claim 6 or 7, characterized in that the teeth (8a, 10a, 1 1 a) of the second toothing (7a) have different axial recesses (12a, 13a) relative to the end face of the second toothed element (4a).

9. spline according to one of claims 1 to 8, characterized in that the spline forms a shaft / hub connection.

10. spline toothing according to claim 9, characterized in that the first toothed region (2) on a hub part (1) and the second toothing region is provided on a shaft.