Abstract:
A coupling arrangement ( 1 ) with a first clamping ring ( 10 ) concentric to the axis of rotation ( 1   a ), a second clamping ring ( 20 ) oriented concentrically with the axis of rotation and grooved around its circumference, and with clamping bodies ( 30 ) oriented radially between the clamping rings ( 10, 20 ); which includes on at least one of the clamping rings projections ( 11 ) that are built into a shape like a ramp ( 10, 20 ), each of which is placed between two neighboring clamping bodies; and which includes a first retainer ( 15 ) and a second retainer ( 25 ), with which the clamping rings ( 10, 20 ) and the clamps ( 30 ) are held together.

Description:
BACKGROUND  
         [0001]    The present invention is directed to a coupling arrangement with a first clamping ring, a second clamping ring, as well as clamping bodies, which are placed radially between the clamping rings, which are fitted inside each other, and concentrically about an axis of rotation.  
           [0002]    This kind of coupling device is arranged between two rotating machine parts with differing relative RPMs, and which move in the same or opposed directions about an axis of rotation in a drive train, for example in an automobile transmission, or belt drive system. Power can be transferred between the machine parts through the coupling arrangement. These kinds of coupling arrangements are self-engaging or engagable free-wheels and clamp-type couplings. The difference between coupling arrangements that work one -way and those that work both ways should be noted. By means of coupling arrangements that work one way, a rotatable connection in a single direction of rotation about an axis of rotation may be made between two machine parts. Coupling arrangements that work both ways are able to make a rotatable connection between two machine parts about an axis of rotation in either a clockwise or counterclockwise direction. Each clamping ring is permanently rotatably fixed to one of the machine parts, or is able to be rotatably fixed to a machine part. The machine parts are usually at least partially positioned inside one another, radially and concentrically; The clamping rings are placed radially between the machine parts and the clamping bodies are located between them. At least one of the clamping rings has a bearing surface facing one of the clamping bodies with at least one projection situated radially in the area of displacement of at least one of the clamping bodies. The projections are arranged in one-sided or two-sided ramplike fashion circumferentially or on the side tangentially facing the clamping bodies. Speed (RPM) differentials and speed adaptations or rotating movements between the clamping rings force the clamps up against the projections, so that the clamping bodies climb up or clamp onto the ramp. The clamping bodies are then clamped between the clamping rings. A disengagable connection in the direction of rotation is thereby created between the machine parts.  
           [0003]    The engagable coupling arrangements that make up this technology may furthermore have an actuating element. The actuating element brings about the difference in RPM or speed adaptation between the clamping rings by restricting, holding in place, or stopping the movement of one clamping ring relative to the other. These coupling arrangements are used for example in differentials and transfer cases. For example, four wheel drive may be engaged by means of this coupling arrangement. Such a unit can be found in U.S. Pat. No. 640,901 B1. An inner clamping ring is placed on a shaft. An outer clamping ring surrounds the inner one. Clamping bodies are enclosed radially by the clamping rings. The outer clamping ring has ramplike, radial projections that protrude between the clamping bodies. Furthermore, the outer clamping ring is interrupted by a continuous groove in the circumferential direction. The clamping rings may be rotated relative to each other at an angle, and about the axis of rotation of a shaft via an actuating element. The actuating element is fitted to the inner clamping ring. The actuating element is positioned to come into contact with the outer clamping ring. On the outer clamping ring there is an outer machine part that may be turned to the outer clamping ring, for example a gear wheel. The outer machine part is separated from the outer clamping ring in such a way that a relative movement between the outer machine part and the outer clamping ring around the axis of rotation is possible while the clamping bodies are free from the ramp-like projections. A rotating movement of the shaft swivels the actuating element. The actuating element in turn acts upon the outer clamping ring in such a way that mechanical linkage is established between the clamping bodies and the ramp-shaped projections. Forces acting on the projections force the grooved outer clamping ring to spring back elastically. The forces change the outside diameter of the outer clamping ring, which comes into contact with the outer machine part in such a way that power may be applied between the machine parts through the coupling arrangement. The grooved clamping rings are knows as “slipper rings” in the trade.  
           [0004]    The manufacture of the clamping rings for the coupling arrangement, especially the bearing surfaces with the ramp-like projections, is expensive, especially due to the machine finishing and cleaning of the bearing surfaces. The mounting of the individual parts of the coupling is relatively costly and time-consuming. Incorrect mounting and loss of parts is entirely possible. The storage and transport costs of the individual parts until their assembly by the manufacturer, i.e. a manufacturer of transmissions, are high.  
         SUMMARY  
         [0005]    The object of the invention therefore, is to create a coupling arrangement that may be economically built and therefore economically mounted, and for which the storage and transport costs of the individual parts during production and mounting is sharply reduced.  
           [0006]    This objective is accomplished by a coupling arrangement with a first clamping ring, a second clamping ring, and clamping bodies situated radially between the clamping rings. The clamping rings are fitted inside one another, concentrically with an axis of rotation, and at least a first retainer is provided on at least one of the clamping rings, and a second retainer is fixed in a longitudinal direction of the axis of rotation. At the same time the clamping rings and the clamping bodies are held together, in a longitudinal direction of the axis of rotation, by the retainers.  
           [0007]    When the clamping rings move relative to one another, the clamping bodies between the first and second clamping rings are clamped. At least one of the clamping rings is fitted with a first retainer and with a second retainer. The clamping bodies and the clamping rings are held together along the axis of rotation by the retainers, and thereby joined into a single component assembly. The idea is for this component to be assembled by the manufacturer of the individual parts of the coupling arrangement. The transportation and storage costs for the individual parts are thereby reduced. The coupling arrangement, provided as a preassembled component, may then be mounted between the machine parts by the manufacturer, for example of transmissions, so that incorrect mounts and the loss of the coupling arrangement&#39;s individual parts is prevented during assembly.  
           [0008]    The invention is designed in such a way that the retainers are spaced apart and are fixed to the first clamping ring in at least one direction of the axis of rotation. At the same time, the retainers engage the second clamping ring by edges or segments cut out of the second clamping ring, which face away from each other at least in a direction of the axis of rotation, at least partially, and which carry and surround the clamping bodies at least partially on both sides. By means of the clamping rings and retainers, the machine component is built in such a way that the clamping bodies are securely held in the coupling arrangement.  
           [0009]    The invention is also designed in such a way that the clamping rings are formed sheet metal parts. The manufacture of such clamping rings is especially economical when mass-produced. The bearing surfaces with the ramp-like projections may be manufactured for example by drawing or rolling the metal, and do not need to be brushed free of shavings or chips afterwards. The manufacture of the clamping rings by drawing or stamping, or by rolling, or by a combination of these processes, conserves material. The materials used to manufacture the clamping rings are preferably metals made of case-hardened steel according to DIN 17210, marked with either 17Cr3 or 16MnCr5. The surface of the fittings is preferably hardened to 700+10HV10 (Eht 550 =0.2-0.7).  
           [0010]    Another element of the invention is that at least the first retainer is of a piece with the first clamping ring. The manufacture of the retainers is thus economically integrated into the finishing of the clamping rings. The design is such that the retainer is a lip protruding from the first clamping ring at a right angle to the axis of rotation, or one or more metal lips extending radially off the clamping ring.  
           [0011]    Another element of the design is that at least one of the retainers is separate from the coupling arrangement&#39;s clamping rings, and held longitudinally against the first clamping ring in at least one longitudinal direction of the axis of rotation. It is preferable that the separately formed retainer be a perforated cap. The axis of rotation extends through the perforation of the perforated cap, whereby the perforated cap attaches itself longitudinally to the clamp in one direction. The perforated cap then engages a cut-out, longitudinally oriented section or edge of the second clamping ring, or, as provided for by the design, is equipped with at least one lip coming off the perforated cap. The lip engages the second clamping ring by at least one section or edge facing the longitudinal direction of the axis of rotation. It is preferable that the perforated cap be constructed by a punch method, which is simple and economical.  
           [0012]    In the invention described above, either the first or second clamping ring includes a bearing surface with ramp-like projections. The design also provides for both clamping rings to be equipped with such a surface.  
           [0013]    Other elements of the invention provide the coupling arrangement with a slipper ring. The coupling arrangement has at least one clamping ring oriented concentrically with the axis of rotation of the machine parts, and a second clamping ring oriented concentrically with the first, which is used as a slipper ring and therefore grooved through its circumference with a groove, making it changeable in circumference; the coupling arrangement also has clamping bodies oriented radially between the clamping rings. The second, grooved clamping ring includes a bearing surface facing the clamping bodies with jutting projections formed into a ramp-like shape that neighbor each other and point radially toward the clamping bodies.  
           [0014]    It is preferable that the clamping rings be sheet metal parts formed using case-hardened steel, and that they exhibit the qualities described above. The second clamping ring is equipped, on the circumferential side facing away from the clamps, with a contact surface, which in turn is equipped with an interface surface for frictional contact with one of the machine parts. A continuous groove runs along the length of the second clamping ring; this groove extends from the machine part interface surface to the bearing surface and is of variable width in the circumferential direction of the second clamping ring, in such a way that when torque is transferred, the second clamping ring is elastic, and may be brought into frictional contact with the machine part, this by virtue of the clamping bodies that are up against the ramp-like projections, and clamped between the clamping rings.  
           [0015]    It is preferable that either the first or second clamping ring be equipped with the retainers, where the retainers lie spaced across from each other in a longitudinal direction of the axis of rotation, and are fastened to one of the coupling (coupling arrangement) rings in at least one longitudinal direction of the axis of rotation.  
           [0016]    The retainers take up and surround the other clamping ring, at least partially, by cut-out sections or edges longitudinal to the axis of rotation, and which face away from each other, and engage its/their edges. Furthermore, the clamping bodies that extend in a longitudinal direction of the axis of rotation are positioned between and held in place by the retainers.  
           [0017]    At least the first retainer is preferably formed as one piece with the first clamping ring, and is preferably a lip made from the metal of the first clamping ring, and extends from it at right angles to the axis of rotation. As an alternative, at least the second retainer is made separate from the clamping rings, and is preferably held longitudinally to the first clamping ring in at least one longitudinal direction of the axis of rotation. In the aforementioned case, the second retainer is preferably a perforated cap. The perforated cap holds to the clamping body longitudinally in one direction, surrounding the axis of rotation. A further provision of the design is that the perforated cap be outfitted with at least one tongue coming off it. The tongue engages the second clamping ring by at least one edge or cut-out section oriented longitudinally with the axis of rotation. The design also provides that the edge or section includes a recess cut out of the second clamping ring. The recess extends longitudinally from the axis of rotation into the clamping ring.  
           [0018]    Another preferred feature of the invention calls for a coupling arrangement where at least the first retainer is formed in one piece with the first clamping ring and at least the second retainer is separate from the clamping rings. The retainer is a lip protruding from the first clamping ring at a right angle to the axis of rotation, and is made from the metal of the first clamping ring. The second retainer is the perforated cap described above. Another feature of the unit is that the perforated cap has a protruding tongue, which engages the second clamping ring by a section or edge oriented in at least one longitudinal direction of the axis of rotation. This edge preferably comprises a recess in the second clamping ring, where the recess extends into the second clamping ring in a longitudinal direction of the axis of rotation.  
           [0019]    For a coupling arrangement with metal clamping rings whose second clamping ring is a slipper ring that may be fixed about an axis of rotation relative to one of the machine parts by means of an actuating element, it is provided that the actuating element formed in one piece with the second clamping ring. Such an actuating element may for example be a recess in the second clamping ring, where the recess extends into the second clamping ring in a longitudinal direction of the axis of rotation, and where the recess may be pivoted relative to the first clamping ring by a catch acting on the coupling arrangement by entering the recess from the outside. Alternatively, the actuating element may be a longitudinal tongue extending in a longitudinal direction away from the second clamping ring, and built from the second clamping ring. The tongue, and thereby the second clamping ring, is oriented such that it may be rotated about the axis of rotation relative to the first clamping ring. Another alternative arrangement provided for by the invention is that the actuating element may be built separately but held longitudinally to the first, ungrooved clamping ring in at least one longitudinal direction of the axis of rotation.  
           [0020]    For a unit with an actuating element, it is further provided that one of the retainers and one of the actuating elements be attached to and made from a common perforated cap with a tongue protruding at first radially from that perforated cap. The perforated cap is held to the first clamping ring in at least one longitudinal direction of the axis of rotation, and holds the clamping bodies longitudinally, and the axis of rotation extends through the perforation. The tongue first engages the second clamping ring, at right angles to the axis of rotation, by the edge of a recess in the second clamping ring, and then protrudes away from the edge longitudinally to the axis of rotation, and finally juts out of the recess and over the second clamping ring. In so doing, the upper part of the tongue comprises the actuating element and engages, for example, a catch (or something similar) on a rotating control part of the coupling arrangement, which may be rotated, at least relative to the first clamping ring. The recess in the second clamping ring has at least one width, tangential to the circumferential direction, which corresponds to the tangential width of the tongue plus a pivot distance for the circumferential pivoting (rotation of the tongue about the axis) of the tongue inside the recess. The pivot distance is given by the angular position, around which the tongue in the gap/catch may be pivoted to engage or disengage the clamping of the clamping bodies to the clamping rings.  
           [0021]    Other features of the invention have to do with the relative positions of the clamping rings. The first clamping ring surrounds the second one a least partially. In so doing, the retainers point away from the first clamping ring and inwards in the direction of the axis of rotation and at right angles to it, and at least partially take up and surround the second clamping ring longitudinally to the axis of rotation. In so doing, the bearing surface on the second, grooved clamping ring points away from the axis of rotation and towards the outside. During the coupling process; the second clamping ring deflects radially inwardly, whereby the width of the groove shrinks and contact is established with one of the machine parts inside the coupling arrangement. As an alternative, the first clamping ring may be arranged inside the second one. In this arrangement, the retainers point out radially from the first clamping ring at right angles to the axis of rotation and away from the axis of rotation, and hold the second clamping ring, at least partially, longitudinally to the axis of rotation. The bearing surface with the ramp-like projections on the second clamping ring points in the direction of the axis of rotation. During the clamping process, the second clamping ring springs up radially, whereby frictional contact with the outer machine part in the coupling arrangement may be established.  
           [0022]    Alternatively, the first clamping ring with the retainers may exhibit a cylindrical bearing surface, or analogously to the second clamping ring, a bearing surface with projections formed into the shape of a ramp. If both clamping rings are equipped with such projections, the coupling arrangement may selectively be used to transfer torque in one or both directions of rotation, clockwise or counter-clockwise. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0023]    In the following pages, the invention will described more thoroughly on the basis of a preferred embodiment. In the drawings:  
         [0024]    [0024]FIG. 1 is a longitudinal section of a coupling arrangement according to the invention.  
         [0025]    [0025]FIG. 2 is a cross section of the invention depicted in FIG. 1.  
         [0026]    [0026]FIG. 3 is a view of the outer clamping ring of the coupling arrangement, as in FIG. 1, shown individually.  
         [0027]    [0027]FIG. 4 is a view of the coupling arrangement shown as a separate component, without any machine parts in the cross section.  
         [0028]    [0028]FIG. 5 is another example of the coupling arrangement as a separate component, without any machine parts.  
         [0029]    [0029]FIG. 5 a  is an enlarged view of detail Y from FIG. 5.  
         [0030]    [0030]FIG. 6 is a cross section of the coupling arrangement as in FIG. 5 taken along the line VI-VI.  
         [0031]    [0031]FIG. 6 a  is an enlarged view of detail X from FIG. 6.  
         [0032]    [0032]FIG. 6 b  is an enlarged view of detail X from FIG. 6 with an alternative design of the perforated cap.  
         [0033]    [0033]FIG. 7 is a view of the inner clamping ring of the coupling arrangement shown as an individual component, as in FIG. 5.  
         [0034]    [0034]FIG. 8 is a view of the perforated cap of the assembly component shown as an individual component, as in FIGS. 5 and 6 a.    
         [0035]    [0035]FIG. 9 is a view of the outer coupling ring of the coupling arrangement seen as a whole, as in FIG. 5  
         [0036]    [0036]FIG. 10 is a longitudinal section of the coupling ring as in FIG. 9.  
         [0037]    [0037]FIG. 10 a  is an enlarged view of detail U from FIG. 10.  
         [0038]    [0038]FIG. 11 is a view of the coupling arrangement as an assembly component as in FIG. 5, depicted as a whole without the machine parts.  
         [0039]    [0039]FIG. 11 a  is an enlarged view of detail V from FIG. 11.  
         [0040]    [0040]FIG. 12 is a longitudinal section through the inner coupling arrangement ring of the coupling arrangement as in FIG. 11.  
         [0041]    [0041]FIG. 12 a  is an enlarged view of detail T from FIG. 12.  
         [0042]    [0042]FIG. 12 b  is an enlarged view of detail W corresponding to FIG. 12.  
         [0043]    [0043]FIG. 13 is a view of the inner coupling arrangement ring corresponding to FIG. 12 as seen from the front.  
         [0044]    [0044]FIG. 14 is a view of another embodiment of a coupling arrangement in longitudinal section.  
         [0045]    [0045]FIG. 15 is a view of the outer coupling ring of the coupling arrangement corresponding to FIG. 14.  
         [0046]    [0046]FIG. 15 a  is an enlarged view of detail S from FIG. 15.  
         [0047]    [0047]FIG. 15 b  is a detail of the outer coupling ring corresponding to FIG. 15.  
         [0048]    [0048]FIGS. 16, 17 are views providing a description of the principle behind a bi-directional coupling arrangement. 
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0049]    [0049]FIGS. 1 and 2 depict a coupling arrangement  1 , with an outer clamping ring  2  as the first clamping ring  10 , and an inside clamping ring  3  as the second clamping ring  20 , with cylinder rollers  4  as clamping bodies  30 , and with an actuating element  40 . The coupling arrangement  1  is placed between a gear wheel  5  and a shaft  6 . The outer clamping ring  2  is firmly mounted in the gear wheel  5 . When the coupling arrangement  1  is not engaged, the inner clamping ring  3  may be turned relative to the shaft  6 . The coupling arrangement  1  is equipped with a full complement of clamping bodies  30 . As follows from especially FIGS. 2 a ,  3  and  4 , both the outer clamping ring  2  and the inner clamping ring exhibit bearing surfaces  7  or  8 , which are equipped with projections  9  or  11  that are formed with a ramp-like shape and placed radially next to the clamping bodies  30 . Each of the clamping bodies  30  is assigned to a projection  9  or  11  in a clockwise or counter-clockwise pivot direction. The projections  9  are formed on the outer surface of the inner clamping ring  3  and stand out radially from the bearing surface  7 . The projections  11  are formed on the inner surface of the outer clamping ring and point radially inwardly from the bearing surface  8 .  
         [0050]    The second clamping ring  20  is a slipper ring and includes a continuous groove extending in a longitudinal direction of the axis of rotation  1   a . The actuating element  40  extends from the coupling arrangement  1  in the same direction as the axis of rotation la, in the form of a tongue  13  that is formed as one piece with the inner clamping ring. The tongue  13  juts toward the outside of the coupling arrangement  1 , into a catch  14 , not depicted in greater detail, which is outside of the coupling arrangement. When the catch  14  rotates around the axis of rotation  1   a , around half the rotation angle φ in one of the directions of rotation, the clamping bodies  30  rise up the ramp-like projections  9  and  11  (FIGS. 16 and 17). The clamping bodies  30  clamp fast between the ramps. In so doing, the inner clamping ring  3  is caused to give inwards in the direction of the axis of rotation, which causes the width B of the groove  12  to diminish. The shaft  6  and the inner clamping ring  3  are then made to rub together. Torque may then be applied through the coupling arrangement  1  between the gearwheel  5  and the shaft  6 .  
         [0051]    The coupling arrangement  1  is, as depicted in FIG. 4, pre-assembled into a single component. To that end, the outer clamping ring  2  includes a first retainer  15  as well as a second retainer  25 . The first retainer  15  is designed as a lip that is formed in one piece with the outer clamping ring. The lip points radially inwardly from the outer clamping ring  2  in toward the axis of rotation la, and in so doing engages the inner clamping ring  3  by a section  17  cut out from the frontal side. The second retainer  25  is a perforated cap  18 . The perforated cap  18  is a punched component and is held to the outer clamping ring by means of an additional lip in one of the longitudinal directions of the axis of rotation. The first retainer  15  and the second retainer  25  hold the second clamping ring  20  between them longitudinally, whereby the retainers  15 ,  25  hold longitudinally to the clamping bodies  30 . In so doing, the perforated cap  18  grabs onto the inner clamping ring by means of a cut-out segment  21  facing longitudinally away from another cut-out segment  17 . The tongue  13  extends through the perforated cap  18  at a catch  22  in the perforated cap  18  that is not further depicted, and which faces radially outward from the hole in the perforated cap, in such a manner that the actuating element  40  may rotate about the angle φ inside the catch  22 .  
         [0052]    [0052]FIG. 3 shows the outer clamping ring before mounting along with the other elements of the coupling arrangement  1 . The outer clamping ring  2  as well as the inner clamping ring  3 , are formed metal parts. Upon assembly, the lips  16  and  19 , are bent radially inwardly towards the axis of rotation by roll crimping.  
         [0053]    [0053]FIGS. 5 and 6 show another embodiment of a coupling arrangement  23 . In the coupling arrangement  23 , the first clamping ring  10  is an outer clamping ring  24 , and the second clamping ring  20  is an inner clamping ring  26 . The outer clamping ring  24  includes a first retainer  15  and a second retainer  25 . The first retainer  15  is a lip  28  that is formed in one piece with the outer clamping ring  24 , and is made as a stamped part. The second retainer  25  is a perforated cap  29 . The lip  28  points radially inwardly from the outer clamping ring toward the axis of rotation  23   a , and engages the inner clamping ring  26  by a ring-shaped section  31  cut out of the frontal side. The perforated cap  29  holds the clamping bodies  30  in a longitudinal direction of the axis of rotation  23   a , and includes a tongue pointing radially inwardly  32  (FIG. 6 a , FIG. 6). The tongue  32  engages behind the inner clamping ring  26  by a section  33 a cut out of a recess  33  in the inner clamping ring  26 . The perforated cap  29  is secured to the outer clamping ring in the longitudinal direction of the axis of rotation  23   a , by means of an additional Iip  34 . The inner clamping ring  26  and the clamping bodies  30  are thereby held longitudinally to the outer clamping ring  24  by the retainers  15  and  25 .  
         [0054]    The inner clamping ring  26  is a slipper ring in the form of a hollow cylinder, and includes a groove  27  (FIG. 13). The inner clamping ring is a metal part produced essentially by metal forming. The characteristics of such a clamping ring  26  are shown in FIGS.  11  to  13 . A drawn part of the inner clamping ring  26  in the shape of a bowl is reduced circumferentially in the thickness of the sheet material at the segments  43  touching the groove  27  (FIG. 11 a ). At first the groove  27  has not been fully cut through on the bowl, but rather punched outward at the recess  27   a . To the left and right along the longitudinal direction of the recess  27   a , there are predetermined breaking points  27   b  (FIGS. 6A &amp; 11A). Connected to the predetermined breaking points in the longitudinal direction of the inner clamping ring  26 , are the recess  33  on one end and the recess  35  on the other. The inner clamping ring  26  is at first kept closed over the predetermined breaking points. After the brim (not pictured) has been pulled off and after a hole has been made in the bottom of the bowl (not pictured), there will be edges  36  and  37  that point radially outwardly (and inwardly) left behind on the inner clamping ring (FIG. 12 a , FIG. 12 b ). There are ramp-shaped projections  38  located on the outside of the bearing surface  26   a  of the inner clamping ring  26  (FIGS. 6 a ,  6   b , and  7 ). The projections  38  cross longitudinally into the edge  36  (FIG. 12 a ). A cylindrical section  39  connects to the projections  38  at the height of the recess  33  (FIG. 7, FIG. 12 b ). The inner clamping ring  26  remains closed circumferentially during the hardening and shaping process taking place over the predetermined breaking points, so that on the one hand the stability of the shape of the cylindrical ring is secured, and on the other hand so that during processing, the ring does not get caught on any other fittings by the groove  27 . The circumferentially separated inner clamping ring  26 , terminated at the predetermined breaking points  27   b , exhibits the functional measurement (B) of the groove  27  after the separation of the predetermined breaking points (FIGS. 11 a  and  16 ).  
         [0055]    The outer clamping ring  24  (FIGS. 9, 10, and  10   a ) is, like the inner clamping ring  26 , a cold-formed metal part. The inside surface area of the outer clamping ring  24  is provided with ramp-like projections  41 . The ramp-like projections  41  extend longitudinally out from the lip  28  and terminate, seen longitudinally, in an at first cylindrical segment  42 , which upon mounting the coupling arrangement  23  is moved over to the lip  34  holding the perforated cap  29  in place. Initially, the lip  28  is supposed to hold the clamping bodies  30  axially and is therefore bent backwards slightly inside the inner part of the outer clamping ring  24  (FIG. 10A). The material of the lip  28  is then bent longitudinally further backwards, and is thereby oriented toward the axis of rotation, and finally angled inward by an edge.  
         [0056]    Inside the coupling arrangement, the edge  28   a  engages the inner clamping ring  26  by the cut-out segment  31  (FIG. 6 a ). The horizontally oriented hollowed cylindrical ring-shaped segment  28   b  of the lip  28  then bridges the longitudinal gap made by the edge  36  between the cogs  38  and the frontal side, so that the clamping bodies  30  do not touch the edge  36  (FIGS. 6 a  and  6   b ). The cylindrical segment  39  of the inner clamping ring  26  juts out longitudinally (at least partially so) from the outer clamping ring, at least partially, causing the recess  33  to jut out in so doing, so that a catch (not depicted) fitted outside the coupling arrangement  23  can grab the recess  33 , which is designed as an actuating element  40 .  
         [0057]    The perforated cap  29  catches the recess  33  with the tongue  32  and may be freely rotated about the coupling arrangement&#39;s  23  axis of rotation  23   a  relative to the outer clamping ring  24  (FIG. 6). FIG. 6 b  shows an alternate design of the coupling arrangement  23  with modifications to the inner clamping ring  26  and the perforated cap  29 . Here the inner clamping ring  26  does not exhibit the cylindrical segment  39  and thereby juts out over the outside of the outer clamping ring  24 . The perforated cap  29  includes an angled catch  32   a  on the tongue  32 , which engages into the actuating element and may be rotated about an angle theta over the inner clamping ring  26 , as depicted in FIG. 16.  
         [0058]    [0058]FIG. 14 shows another embodiment of a coupling arrangement  44 . The coupling arrangement  44  is placed between the gearwheel  5  and the shaft  6  and is comprised of an outer clamping ring  45 , an inner clamping ring  46 , and clamping bodies  30 . In the coupling arrangement  44 , the first clamping ring  10  is the inner clamping ring  46 , and the second clamping ring  20  is the outer clamping ring  45 . The inner clamping ring  46  is a formed metal part having a first retainer  15  in the form of a lip  47  designed to be one piece with the inner clamping ring  46 . The lip  47  is angled radially away from the axis of rotation  44   a  of the coupling arrangement, pointing outward. The second retainer  25  is a perforated cap  48  that lies across from the lip  47  in a longitudinal direction of the axis of rotation  44   a , and which takes up and surrounds the clamping bodies  30 . The lip  47  engages the outer clamping ring  45  by a ring-shaped segment  49  that is oriented longitudinally to the axis of rotation  44   a , and which forms the frontal part of the outer clamping ring  45 . The perforated cap  48  includes a tongue ( 50 ) pointing radially outwardly from the perforated cap  48 , which engages the outer clamping ring  45  by a recess  51  by a cut out segment  51   a  turned longitudinally away from the cut-out segment  49 .  
         [0059]    The perforated cap  48  is held longitudinally to the inner clamping ring  46  by means of an additional lip  58 , so that the inner clamping ring  46 , the clamping bodies  30 , the perforated cap  48  and the outer clamping ring  45  are held together in a single assembly part.  
         [0060]    The outer clamping ring  45  is a slipper ring with ramp-like projections  53  that extend out radially from the bearing surface  52  (FIG. 15). The slipper ring is grooved  54  all around (FIGS. 15, 15 a , and  15   b ). The second clamping ring is a formed metal part that is closed at first. The outer clamping ring  45  is made with a predetermined breaking point  55 , against which the wall of the outer clamping ring  45  is diminished and partially cut through by means of an outwardly stamped surface  56  (FIGS. 15 a ,  15   b ). During the heat treatment, the outer clamping ring  45  is at first locked to the predetermined breaking point and thereby stabilized. The predetermined breaking point  55  of the outer clamping ring  45  is broken, so that the fitting becomes grooved.  
         [0061]    On an unengaged coupling arrangement  44 , the first clamping ring  10  and the second clamping ring  20  are at first fitted firmly to the shaft  6 . The gearwheel  5  is fixed to the second clamping ring  20 , designed as an outer, clamping ring  45 , in such a way that it may be rotated relative to the axis of rotation  44 a. A catch  57  engages into the recess  51  designed to function as an actuating element  40 . The coupling arrangement  44  may be engaged by means of the catch  57  pivoting clockwise or counter-clockwise about the angle φ/ 2 . In so doing, the clamping bodies  30  clamp between the first clamping ring  10  and the second clamping ring  20 . The second clamping ring  20  springs up elastically in such a way that the outer clamping ring  45  is brought into frictional contact with the gearwheel  5 . The shaft  6  then has a firm turning connection to the cogwheel  5  through the coupling arrangement  44  activated by the catch  57 .  
         [0062]    Reference Markings  
         [0063]    [0063] 1  Coupling arrangement  
         [0064]    [0064] 1   a  Axis of rotation  
         [0065]    [0065] 2  Outer clamping ring  
         [0066]    [0066] 3  Inner clamping ring  
         [0067]    [0067] 4  Cylinder  
         [0068]    [0068] 5  Gear wheel  
         [0069]    [0069] 6  Shaft  
         [0070]    [0070] 7  Bearing surface  
         [0071]    [0071] 8  Bearing surfaces  
         [0072]    [0072] 9  Projection  
         [0073]    [0073] 10  First clamping ring  
         [0074]    [0074] 11  Projection  
         [0075]    [0075] 12  Groove  
         [0076]    [0076] 13  Tongue  
         [0077]    [0077] 14  Catch  
         [0078]    [0078] 15  First Retainer  
         [0079]    [0079] 16  Lip  
         [0080]    [0080] 17  Cut-out segment  
         [0081]    [0081] 18  Perforated cap  
         [0082]    [0082] 19  Lip  
         [0083]    [0083] 20  Second clamping ring  
         [0084]    [0084] 21  Cut-out segment  
         [0085]    [0085] 22  Recess  
         [0086]    [0086] 23  Coupling arrangement  
         [0087]    [0087] 23   a  Axis of rotation  
         [0088]    [0088] 24  Outer clamping ring  
         [0089]    [0089] 25  Second retainer  
         [0090]    [0090] 26  Inner clamping ring  
         [0091]    [0091] 26   a  Bearing surface  
         [0092]    [0092] 27  Groove  
         [0093]    [0093] 27   a  Recess  
         [0094]    [0094] 27   b  Predetermined breaking point  
         [0095]    [0095] 28  Lip  
         [0096]    [0096] 28   a  Edge  
         [0097]    [0097] 28   b  Ring segment (cut out)  
         [0098]    [0098] 29  Perforated cap  
         [0099]    [0099] 30  Clamping ring  
         [0100]    [0100] 31  Cut out segment  
         [0101]    [0101] 32  Tongue  
         [0102]    [0102] 32   a  Catch  
         [0103]    [0103] 33  Recess  
         [0104]    [0104] 33   a  Cut out segment  
         [0105]    [0105] 34  Lip  
         [0106]    [0106] 35  Recess  
         [0107]    [0107] 36  Edge  
         [0108]    [0108] 37  Edge  
         [0109]    [0109] 38  Projection  
         [0110]    [0110] 39  Cut out segment  
         [0111]    [0111] 40  Actuating element  
         [0112]    [0112] 41  Projection  
         [0113]    [0113] 42  Cut out segment  
         [0114]    [0114] 43  Cut out segment  
         [0115]    [0115] 44  Coupling arrangement  
         [0116]    [0116] 44   a  Axis of rotation  
         [0117]    [0117] 45  Outer clamping ring  
         [0118]    [0118] 46  Inner clamping ring  
         [0119]    [0119] 47  Lip  
         [0120]    [0120] 48  Perforated cap  
         [0121]    [0121] 49  Cut out segment  
         [0122]    [0122] 50  Tongue  
         [0123]    [0123] 51  Recess  
         [0124]    [0124] 52  Bearing surface  
         [0125]    [0125] 53  Cog  
         [0126]    [0126] 54  Groove  
         [0127]    [0127] 55  Predetermined breaking point  
         [0128]    [0128] 56  Indentation  
         [0129]    [0129] 57  Catch  
         [0130]    [0130] 58  Lip