WO2009013074A2 - Wave generator for a harmonic drive - Google Patents

Abstract

The invention relates to a wave generator (11) for a harmonic drive, which wave generator comprises a wave ring (2), which is provided with an elliptical outer contour, and a rolling bearing which is attached to the wave ring and has rolling bodies (5), which wave generator is characterized in that a rolling body raceway (7) for the rolling bodies is formed in the manner of a channel into an outer peripheral surface(6) of the wave ring. The invention also relates to a wave generator for a harmonic drive, which wave generator comprises a wave ring, which is provided with an elliptical outer contour, and a rolling bearing which is attached to the wave ring and has rolling bodies, wherein the rolling bodies are held in each case in rolling body pockets (10, 11) of an annular rolling body cage (4), which wave generator is characterized in that at least one rolling body pocket is formed in the manner of a rolling body securing pocket (11) which at least partially engages in both axial directions of the wave ring behind the rolling body which is held in said rolling body securing pocket.

Description

 Name of the invention

Wave generator for a wave gear

description

Field of the invention

The present invention is in the technical field of transmission technology and relates to their genus wave generators for a wave gear according to the preambles of the independent claims.

Background of the invention

For applications where low torque is to be converted into high torque with high speed reduction, such as in electric camshaft phasers, harmonic drives are often used.

Corrugated gears are nowadays usually used in two different types of construction, namely in the so-called pot design, which is described, for example, in US Pat. No. 355929 and in European Patent Application No. 1039100 A2, and in the so-called sleeve design, such as, for example in International Patent Applications WO 1995/00748 A1 and WO 2005/080757.

Common to both types of construction is an elliptically contoured adjusting shaft, generally referred to as a "wave generator", which can deform a bending elastic sleeve located within a ring gear in such a way that a torque transmitting connection is produced between sleeve and ring gear at two opposite points. In a typical embodiment of the wave gear, the elastic sleeve with an external toothing and the ring gear are provided with an internal toothing for realizing the torque-transmitting compounds. If the outer toothing of the elastic sleeve, for example, two teeth more than the internal teeth of the ring gear, then engages an output tooth of the sleeve after a complete rotation of the adjusting in a tooth gap of the ring gear, the two tooth gaps in front of the original tooth gap (in which the starting tooth before the beginning of Rotation of the adjusting shaft has reached) is. Thus, the sleeve remains in each case by two teeth per complete revolution of the adjusting shaft, so that the sleeve rotates in the ratio of the total number of teeth of the ring gear to the difference number of teeth of ring gear and sleeve against the direction of rotation of the adjusting, whereby a high speed reduction is realized.

A generic wave generator, as known for example from European Patent Application No. 0266972 A2, will be explained in more detail with reference to Figures 12 to 16. FIG. 12 shows an exploded view of the components of the wave generator denoted overall by the reference numeral 100, FIG. 13 shows a plan view, and FIG. 14 shows an axial section through the assembled wave generator 100.

As can be seen in particular from FIG. 12, the wave generator 100 is composed of a corrugated ring 101 and a ball bearing, which is designated as a whole by the reference number 102 and concentric with the corrugated ring 101. The ball bearing 102 comprises an inner ring 104, an outer ring 106, an annular ball cage 105 with cage pockets 108 and balls 107. In the annular outer peripheral surface 111 of the inner ring 104, a groove-shaped recessed inner race 109 for the balls 107 is incorporated in the circumferential direction. In a corresponding manner, the annular inner peripheral surface 112 of the outer ring 106 is provided in the circumferential direction with a groove-shaped recessed outer raceway 110 for the balls 107. At one end of the corrugated ring 101, an annular collar 103 is formed. For mounting the wave generator 100, the outer ring 106 is first brought eccentrically over the inner ring 104, resulting in a crescent-shaped gap between the inner ring 104 and outer ring 106 results. Subsequently, the balls 107 are placed in the crescent-shaped gap. When all the balls 107 are in the crescent-shaped gap, the balls 107 are distributed, whereby the outer ring 106 is positioned concentrically with the inner ring 104. Subsequently, the ball cage 105 is inserted in the axial direction between the inner and outer ring, wherein in each cage pocket 108, a ball 107 is received. By the ball cage 105, the balls 107 are held at an equal distance from each other, so as to avoid a collision of the balls 107. A rolling of the balls 107 is not affected thereby.

The fully assembled ball bearing 102 is then pressed onto the corrugated ring 101, being secured by the integrally formed on the corrugated ring 101 collar 103 of the ball cage 105 against falling out in the axial direction.

An assembled state of the wave generator 100 is shown in FIGS. 13 and 14, wherein FIG. 13 shows, in particular, how the annular collar 103 secures the ball cage 105 from falling out of the ball bearing 102.

As can further be seen from FIG. 13, the corrugated ring 101 is provided with an elliptical outer profile, wherein a denotes the main axis of the ellipse and b the minor axis of the ellipse.

If the corrugated ring 101 is rotated about its axis of symmetry, the inner ring 104 is deformed by its elliptical outer profile and the balls 107 adjacent to the main axis a of the ellipse are in each case displaced radially outward. About the radial displacement of the balls 107 to the outside of the outer ring 106 is deformed in a corresponding elliptical.

For example, when the wave generator 100 is inserted into an external-tooth elastic sleeve located inside a ring gear with internal teeth, by rotating the corrugated ring 101, the outer ring 106 becomes elliptical deformed, whereby the serrations of sleeve and ring gear respectively on the main axis a of the ellipse engage.

In order that in the generic wave generator, the stresses in the inner ring 104 in an elliptical deformation by the corrugated ring 101 in an acceptable manner are low, it is necessary to form the inner ring 104 sufficiently thin-walled. However, a relatively thin-walled inner ring is compared to a standard ball bearing with relatively thick-walled inner ring, associated with increased manufacturing costs. In addition, there is an additional expense when pressing the ball bearing 102 onto the corrugated ring 101.

In FIGS. 15 and 16, the annular ball cage 105 of the wave generator 100, as is known, for example, from US Pat. No. 3,285,099, is shown in more detail. FIG. 15 shows a perspective view of the ball cage 105 and FIG. 16 shows a plan view of a section of the ball cage 105.

Each cage pocket 108 of the ball cage 105 is formed by a semicircular recess 113, which opens in two, parallel to each other in the axial direction, straight webs 114. The cage pockets 108 are thereby open in the axial direction in each case on one side, to allow insertion of the balls 107 in the cage pockets 108.

The cage pockets 108 must allow the balls 107 sufficient freedom of movement so that they can move on their elliptical path, while the ball cage 105 itself remains annular (round). For this purpose, the webs 113 are usually formed V-shaped, while they are rectangular shaped in the axial direction.

However, this results in the disadvantage that the ball cage 105 is not fixed in the axial direction, but may fall out of the ball bearing 102, if it is not held by the integrally formed on the corrugated ring 101 collar 103. Since the attachment of the ball cage 105 is ensured only after the assembly of the ball bearing 102 on the corrugated ring 101, must during installation Montagevor- Care must be taken to ensure that the ball cage 105 does not fall out of the ball bearing 102.

task

In contrast, the object of the present invention is to provide a wave generator for a wave gear available, which allows a particularly simple and inexpensive installation compared to conventional wave generators.

Summary of the invention

This object is achieved according to the proposal of the invention by a wave generator for a wave gear with the features of claim 1, and by a wave generator for a wave gear with the features of claim 8. Advantageous embodiments of the invention are indicated by the features of the subclaims.

According to a first aspect of the invention, there is shown a wave generator for a magnetic transmission comprising a corrugated ring provided with an elliptical outer contour and a rolling bearing (eg ball bearing) mounted on the corrugated ring with rolling elements (eg balls). The wave generator according to the invention is characterized in an essential way in that in a Außenumfangs- surface of the corrugated ring in Umfangsgehchtung a rolling body track (inner raceway) is groove-shaped incorporated for the rolling elements. In a particularly advantageous embodiment of the wave generator according to the invention an elliptical Wälzkörperlaufbahn is incorporated for this purpose in an annular (round) outer peripheral surface of the corrugated ring, so that the corrugated ring has only in the elliptical Wälzkörperlaufbahn an elliptical outer contour and otherwise has a round outer contour.

In the wave generator according to the invention, the inner race for the balls is incorporated in the outer peripheral surface of the corrugated ring. Through the here- realized by "one-piece" design of corrugated ring and inner ring of the bearing can on the one hand a component (inner ring) can be saved and on the other hand, the corrugated ring thicker than a conventional inner ring for a rolling bearing of a wave generator can be realized, whereby the manufacturing costs and assembly costs are reduced. In a particularly simple manner, an elliptically contoured inner raceway for the rolling elements can be formed on the round outer peripheral surface of a relatively thick-walled corrugated ring.

During assembly of the corrugated ring, the elliptical inner raceway profile is transmitted to the outer ring of the rolling bearing by means of the rolling elements. Thus, the function of the wave generator remains unchanged, however, the production of a thin-walled inner ring is saved for the rolling bearing and reduces assembly costs. A prior mounting of the bearing before applying the assembled rolling bearing to the corrugated ring is unnecessary.

In a particularly advantageous embodiment of the wave generator according to the invention, the rolling elements are each received in rolling elements pockets of an annular Wälzkörperkäfigs, wherein at least one Wälzkörpertasche is designed in the form of a Wälzkörpersicherungstasche which at least partially engages behind the rolling element received in her in both axial directions of the corrugated ring (surrounds).

By the axial engaging behind the rolling elements by the Wälzkörpersurch- tion pockets of Wälzkörperkäfigs can be achieved in a particularly simple manner securing the Wälzkörperkäfigs against axial falling out of the rolling bearing. A conventional manner for axial securing of the rolling element cage inserted collar on the corrugated ring can thus be saved. Once the Wälzkörperkäfig is brought into position in the rolling bearing, this is secured against the recorded in the Wälzkörpersicherstaschen rolling elements against axial falling out.

The Wälzkörpersicherungstaschen are advantageously each formed in the form of an elastically deformable snap pocket, in the elastically deformable Webs of the cage pockets engage behind the male rolling elements in the axial direction. The Wälzkörpersicherungstaschen are each provided with an opening through which the rolling elements can be accommodated, wherein the opening width is smaller than a radial diameter of the rolling body.

For a wave generator, it is important that the elliptical outer profile of the corrugated ring is transferred as accurately as possible to the outer ring of the bearing. This succeeds the better the more rolling elements are present in the rolling bearing. On the other hand, the rolling elements must have sufficient freedom of movement in the rolling body pockets for their elliptical movement, which forces the rolling elements a radial displacement. These two properties are in contradiction to the fact that for the elastic webs of Wälzkörpersicherungstaschen a certain web width is required because the elastic webs of Wälzkörpersicherungstaschen must be able to rebound. However, if the land width of the elastic webs is too small, the webs of adjacent Wälzkörpersicherungstaschen hinder each other during the springing.

Against the background of this problem, it is particularly advantageous if in the circumferential direction between two Wälzkörperssicherstaschen at least one is not arranged in the form of a Wälzkörpersicherungstasche Wälzkörpertasche without the rolling element engages behind elastic webs. For example, only every second rolling-element pocket or every third rolling-body pocket in the form of a rolling body securing pocket is formed in the circumferential direction.

The invention further extends to a wave gear, with at least one ring gear, a trained in the form of an elastic sleeve spur gear, which is at least partially disposed within the ring gear, and a formed according to the first aspect of the invention wave generator, which is suitable, via its outer ring elastically deforming the sleeve so that a torque transmitting connection is made between the ring gear and the sleeve at two opposite locations. According to a second aspect of the invention, there is shown a wave generator for a wave gear comprising a corrugated ring provided with an elliptical outer contour and a rolling bearing (eg ball bearing) mounted on the corrugated ring with rolling elements (eg balls) are received in each rolling body pockets of an annular Wälzkörperkäfigs. The wave generator according to the invention is essentially characterized in that at least one rolling body pocket is designed in the form of a rolling body locking pocket which at least partially engages behind the rolling element received in it in both axial directions of the corrugated ring.

Particularly advantageous is the Wälzkörpersicherungstasche formed in the form of an elastically deformable snap pocket for the rolling elements.

Furthermore, it is particularly advantageous in the circumferential direction between two Wälz- body securing pockets at least one not designed in the form of a Wälzkörpersicherungstasche Wälzkörpertasche arranged.

Furthermore, it is advantageous if a rolling body raceway for the rolling elements is incorporated groove-shaped in an outer peripheral surface of the corrugated ring. In this case, it is preferable if an elliptically contoured rolling body raceway is incorporated in an annular outer peripheral surface of the corrugated ring.

The invention further extends to a wave gear, having at least one ring gear, a trained in the form of an elastic sleeve spur gear which is at least partially disposed within the ring gear, and a wave generator according to the second aspect of the invention, which is suitable with its outer ring deforming the sleeve so elastically that between the ring gear and the sleeve at two opposite locations a torque transmitting connection is made. embodiment

The invention will now be explained in more detail with reference to an embodiment, reference being made to the accompanying drawings.

Brief description of the figures

Show it:

Fig. 1 is an exploded view of the components of a wave generator according to an embodiment of the invention;

FIG. 2 shows a schematic radial section through the mounted wave generator of FIG. 1; FIG.

Fig. 3 is a plan view of the assembled wave generator of Fig. 1;

4 shows a schematic axial section through the mounted wave generator of FIG. 1;

Fig. 5 shows a further schematic radial section through the mounted

Wave generator of Fig. 1;

Fig. 6 is a perspective view of the ball cage with accommodated in the cage pockets balls of the wave generator of Fig. 1;

FIG. 7 shows a schematic radial section of a section of the ball cage of the wave generator of FIG. 1; FIG.

Fig. 8 is a plan view of a portion of the ball cage of the wave generator of Fig. 1; Fig. 9 is a side view of a portion of the ball cage of the wave generator of Fig. 1;

FIG. 10 shows a schematic radial section of a section of the ball cage of the wave generator of FIG. 1 in the region of the main axis of the ellipse of the corrugated ring; FIG.

11 shows a schematic radial section of a section of the ball cage of the wave generator of FIG. 1 in the region of the minor axis of the ellipse of the wave ring;

FIG. 12 shows an exploded view of the components of a generic wave generator; FIG.

Fig. 13 is a plan view of the assembled wave generator of Fig. 12;

Fig. 14 is a perspective view of the assembled wave generator of Fig. 12;

Fig. 15 is a perspective view of the ball cage of the wave generator of Fig. 12;

16 shows a schematic radial section of a section of the ball cage of the wave generator of FIG. 12.

Detailed description of the figures

FIGS. 12 to 16, which show a conventional generic wave generator, have already been explained in detail in the introduction to the description, so that a further description is unnecessary here. Reference is first made to Figs. 1 to 4, wherein an embodiment of the wave generator according to the invention is illustrated in various representations.

The generally designated by the reference numeral 1 wave generator comprises a round radial section corrugated ring 2, a concentric to the corrugated ring (in radial section) outer ring 3, concentric to the corrugated ring 2 (in radial section round) ball cage 4 and a plurality of balls 5, wherein the corrugated ring , the ball cage 4, the outer ring 3 and the balls 5 together form a ball bearing.

The annular inner peripheral surface 8 of the outer ring 3 is provided in the circumferential direction with a groove-shaped recessed outer raceway 9 for the balls 5. Furthermore, in the annular outer peripheral surface 6 of the corrugated ring 2 in the circumferential direction a groove-shaped recessed inner race 7 for the balls 5 is incorporated. Both inner and outer raceway fix the balls 5 in the axial direction.

As can be seen in particular in Fig. 2, the inner race 7 in the radial section perpendicular to the axis of symmetry A an elliptical outer contour. The outer peripheral surface 6 of the corrugated ring 2 is (only) provided in the region of the inner race 7 with an elliptical outer contour and otherwise annular (round). In FIG. 3, for the ellipse formed by the inner race 7 with a the main axis (connecting line of the two points with the greatest distance from the EIMp center) of the ellipse and with b the minor axis perpendicular to the main axis a (connecting line of the two points with lowest Distance to the ellipse center) of the ellipse. The inner diameter of the corrugated ring 2 is denoted by d.

To assemble the wave generator 1, the outer ring 3 is first brought eccentrically over the corrugated ring 2, resulting in a crescent-shaped gap between the corrugated ring 2 and the outer ring 3. Subsequently, the balls 5 are placed in the crescent-shaped gap. When all the balls 5 in the crescent-shaped gap are located, the balls 5 are distributed, whereby the outer ring 3 is positioned concentrically with the corrugated ring 2. Subsequently, the ball cage 4 is inserted in the axial direction between the corrugated ring 2 and outer ring 3, wherein a ball 5 is received by each cage pocket 10, 11. By means of the ball cage 4, the balls 5 are kept at the same distance from each other so as to avoid a collision of the balls 5. A rolling of the balls 5 is not affected thereby.

Compared with an inner ring of a conventional standard ball bearing, the corrugated ring 2 has a larger radial ring thickness.

If the corrugated ring 2 is rotated, the balls 5 are offset in the radial direction in accordance with the elliptical outer profile of the inner race 7 of the corrugated ring 2, the balls 5 adjacent to the main axis a being displaced radially outwards, while the balls 5 adjacent to the minor axis b radially inwardly offset. In a corresponding manner, the outer ring 3 is elliptically deformed via the balls 5.

If the wave generator 1 is inserted, for example, into an outer-toothed elastic sleeve located inside a ring gear with internal toothing, the outer ring 3 is elliptically deformed by turning the corrugated ring 2 via the balls 5, whereby the toothings of the sleeve and ring gear at two opposite points correspond to the rotational position the major axis a of the elliptical inner race 7 engage.

Reference is now made to FIGS. 5 to 11, wherein the ball cage 4 of the wave generator 1 is explained in more detail.

The annular in radial section (round) ball cage 4 is distributed in the circumferential direction with a plurality of cage pockets 10, 11 is provided. The cage pockets 10, 11 are formed in two mutually different shapes, namely in the form of a first cage pocket 10 and in the form of a second cage pocket eleventh Each first cage pocket 10 comprises a recess 12 for receiving a ball 5, which forms a spherical (more precisely spherical segment-shaped) cavity 16. It further comprises two extending in the axial direction A, arranged parallel to each other, straight first webs 13, which continue the recess 12 axially.

Each second cage pocket 11 comprises a recess 5 for receiving a ball 5 which forms a spherical (or spherical-segment-shaped) cavity 16. It also comprises two curved second webs 14, which are formed on the recess and complement the spherical (or spherical segment-shaped) shape of the cavity 16. For this purpose, the second webs 4 each have a same center of curvature and a same curvature as the recess 12 to which they are integrally formed.

The two mutually facing end portions of the two second webs 14 of a same second ball pocket 11 form between them an opening 15 with a width c. The width c is chosen so that it is less than the diameter d of a ball. 5

The second webs 14 are elastically deformable, so that a ball 5 can be received by elastic deformation of the second webs 14 through the opening 15 into the cavity 16 of the second cage pocket 11. The second cage pockets 11 thus serve as snap pockets for the balls 5. If a ball 5 is received in the cavity 16 of a second cage pocket 11, then the second webs 14 engage behind the ball 5 in the axial direction A.

In the mounted state of the wave generator 1, the ball cage 4 is thus secured by a behind engaging guided in the inner and outer race balls 5 by the second cage pockets 11, so that the ball cage 4 in the assembled state does not fall out of the ball bearing and in an advantageous manner Way can be dispensed with an additional securing element for axial securing of the ball cage 14. Both the first cage pockets 10 and the second cage pockets 11 are formed so that the balls 5 are not impaired when rolling on their two raceways 7, 9. In order to realize the largest possible number of balls 5, and to avoid that the second webs 14 hinder each other in the elastic springing, in the ball cage 4 of the wave generator 1 in the circumferential direction, only every third cage pocket in the form of a second cage pocket 11 (Wälzkörpersicherungstasche ), so that two first cage pockets 10 are located between two adjacent second cage pockets 11.

As can be seen in particular from FIG. 7, first and second cage pockets 10, 11 allow the balls 5 sufficient freedom of movement in the radial direction on their elliptical track. B denotes an illustrated situation, in which a ball 5 is located in a radially outermost position, corresponding to a rotational position of the corrugated ring 2, in which the main axis a of the ellipse of the inner race 7 of the corrugated ring 2 is directed towards the ball 5 , On the other hand, C represents an illustrated situation, in which the ball 5 is in a radially far inward position, corresponding to a rotational position of the corrugated ring 2, in which the minor axis b of the ellipse of the inner race 7 of the corrugated ring 2 is directed towards the ball 5. Furthermore, 7 intermediate positions between these two extreme positions of the ball 5 are shown in FIG.

The outer diameter of the ball cage 4 are the inner diameter of the outer ring 4 are to be dimensioned in a suitable manner. 10 shows a situation in which the main axis a of the ellipse of the inner race 7 of the corrugated ring 2 is directed to a ball 5. Obviously remains between ball cage 4 and outer ring 3 a designated D gap. In contrast, FIG. 11 shows a situation in which the minor axis b of the ellipse of the inner raceway 7 of the corrugated ring 2 faces the ball 5. Obviously remains between the ball cage 4 and the outer ring 3, a gap E, which is dimensioned smaller in the radial direction than the gap D. In the wave generator shown, in contrast to conventional wave generators no additional component for the axial fixation of the ball cage is necessary because the ball cage on the second cage pockets on the running in the two tracks (and thus axially fixed) balls is axially fixed. As a result, the wave generator can be made simpler and thus cheaper. In addition, there is no risk during assembly that the ball cage falls from the ball bearing, which allows a reduced installation and handling costs. The function of the wave generator is not affected by the snap pockets provided with ball cage.

LIST OF REFERENCE NUMBERS

1 wave generator

2 corrugated ring 3 outer ring

4 ball cage

5 ball

6 outer peripheral surface

7 inner race 8 inner circumferential surface

9 outer career

10 first cage pocket

11 second cage pocket

12 recess 13 first bridge

14 second bridge

15 opening

16 cavity

100 wave generator 101 corrugated ring

102 ball bearings

103 ring collar

104 inner ring

105 ball cage 106 outer ring

107 ball

108 cage pocket

109 inner raceway

110 outer race 111 outer peripheral surface

112 inner peripheral surface

113 deepening

114 footbridge

Claims

claims 1. wave generator (1) for a wave gear, which has a elliptical outer contour provided with a corrugated ring (2) and a rolling ring mounted on the rolling bearing with rolling elements (5), characterized in that in an outer peripheral surface (6) of the corrugated ring a Wälzkörperlaufbahn ( 7) is groove-shaped incorporated for the rolling elements. 2. wave generator according to claim 1, characterized in that in an annular outer peripheral surface (6) of the corrugated ring (2) has an elliptical Wälzkörperlaufbahn (7) is incorporated. 3. Well generator according to one of claims 1 to 2, characterized in that the rolling bearing is designed in the form of a ball bearing. 4. wave generator according to one of claims 1 to 3, wherein the rolling elements in each rolling body pockets (10, 11) of an annular Wälzkörperkäfigs (4) are accommodated, characterized in that at least one Wälzkörpertasche pocket in the form of a Wälzkörpersurch- (11) is formed which at least partially engages behind the rolling element received in it in both axial directions of the corrugated ring. 5. Well generator according to claim 4, characterized in that the at least one Wälzkörpersicherungstasche (11) is designed in the form of an elastically deformable snap pocket. 6. wave generator according to one of claims 4 to 5, characterized in that in the circumferential direction between two Wälzkörpersiche- tion pockets (11) at least one not designed in the form of a Wälzkörpersicherungstasche Wälzkörpertasche (10) is arranged. 7. wave gear, with at least one ring gear, designed in the form of an elastic sleeve spur gear, which is at least partially disposed within the ring gear, and a wave generator, which is adapted to elastically deform the sleeve so that between the ring gear and the sleeve two Opposite torque-transmitting connections are made, wherein the wave generator is designed according to one of claims 1 to 6. 8. wave generator (1) for a wave gear, which has a ellipti- see outer contour provided corrugated ring (2) and an applied to the corrugated rolling bearing with rolling elements (5), wherein the rolling bodies (5) each in Wälzkörpertaschen (10, 11 ) of an annular Wälzkörperkäfigs (4), characterized in that at least one Wälzkörpertasche is formed in the form of a Wälzkörpersurch- tion pocket (11), which accommodated in her Rolling element (5) engages behind in two axial directions of the corrugated ring at least partially. 9. wave generator according to claim 8, characterized in that the at least one rolling body securing pocket (11) is designed in the form of an elastically deformable snap pocket. 10. wave generator according to one of claims 8 to 9, characterized in that in the circumferential direction between two Wälzkörpersiche- tion pockets (11) at least one not designed in the form of a Wälzkörpersicherungstasche Wälzkörpertasche (10) is arranged. 11. wave generator according to one of claims 8 to 10, characterized in that in an outer peripheral surface (6) of the corrugated ring (2) has a rolling body raceway (7) for the rolling elements (5) is groove-shaped incorporated. 12. wave generator according to claim 11, characterized in that in an annular outer peripheral surface (6) of the corrugated ring (2) an elliptically kontütter Wälzkörperlaufbahn (7) is incorporated. 13. Well generator according to one of claims 8 to 12, characterized in that the rolling bearing is designed in the form of a ball bearing. 14. wave gear, with at least one ring gear, a trained in the form of an elastic sleeve spur gear, which is at least partially disposed within the ring gear, and a wave generator, which is adapted to elastically deform the sleeve so that between the ring gear and the sleeve two Opposite torque-transmitting connections are made, wherein the wave generator is designed according to one of claims 8 to 13.