WO2021223790A1

WO2021223790A1 - Annular clamping element with splined transmission

Info

Publication number: WO2021223790A1
Application number: PCT/DE2021/000083
Authority: WO
Inventors: Martin Zimmer; Günther Zimmer
Original assignee: Martin Zimmer; Zimmer Guenther
Priority date: 2020-05-06
Filing date: 2021-05-06
Publication date: 2021-11-11
Also published as: DE102020002706A1; EP4146423A1

Abstract

The invention relates to an annular clamping element (10) with an annular housing (21), which has at least one pneumatic or hydraulic connection (13), and a ring piston (91), which can be moved in two stroke directions in the longitudinal direction of the annular clamping element. The housing has a rigid cylinder casing region (62) that surrounds a longitudinal axis oriented in the longitudinal direction and which comprises a guide section (63) and a free-standing inner wall (61), which has at least two clamping contact plates (73). Each clamping contact plate has a rolling surface (76) on the exterior. The inner wall, the ring piston, and at least two rolling bodies (131), each of which is mounted between an individual rolling surface and the ring piston, form a splined transmission, the frame of which is the cylinder casing region. During a movement of the ring piston, said movement being guided along the guide section, in one of the stroke directions of the ring piston, the inner wall is deformed radially to the longitudinal axis in the region of the clamping contact plates against an internal restoring force of the inner wall. The invention provides an annular clamping element with a long service life which can be used for braking and/or fixing purposes.

Description

Ring clamping element with splined gear

Description :

The invention relates to a ring clamping element with a ringför shaped, at least one pneumatic or hydraulic connection having housing and with an annular piston movable in two stroke directions in the direction of its longitudinal direction.

A clamping device with radially movable clamping elements is known from DE 102008 054 140 A1.

The present invention is based on the problem of developing a ring clamping element that can be used for braking and / or fixing with a long service life.

CONFIRMATION COPY This problem is solved with the features of the main claim. For this purpose, the housing has a, one in the longitudinal direction oriented longitudinal axis encompassing, a rigid Zylin dermantelbereich with a guide section and at least two clamping contact plates having, free-standing inner wall. Each terminal contact plate has a rolling surface on its outside. The inner wall, the annular piston and at least two rolling elements mounted between each individual rolling surface and the annular piston form a splined gear, the frame of which is the cylinder jacket area. When the annular piston moves along the guide section in one of its stroke directions, the inner wall in the area of the clamping contact plates is deformed radially towards the longitudinal axis against an internal restoring force of the inner wall.

The ring clamping element is used to grip and clamp a rod with a circular cross-sectional area. the

The center line of the rod lies on the longitudinal axis of the ring clamping element. The ring clamping element has a housing of high rigidity. The inner wall of the housing, which is oriented towards the rod, is designed as an elastically deformable clamping area in some areas. The clamping area has, for example, a large number of clamping contact plates that are pressed against the rod when clamping. An annular piston which can be adjusted in the longitudinal direction of the annular clamping element and which actuates the clamping contact plates by means of a multiplicity of simultaneously actuated wedge gears with interposed rolling elements is used to drive the annular clamping element. The number of wedge gears corresponds to the number of terminal contact plates. Further details of the invention emerge from the subclaims and the following description of schematically presented embodiments.

Figure 1: ring clamping element; FIG. 2: bottom part of the ring clamping element; FIG. 3: cover part of the ring clamping element; FIG. 4: annular piston; FIG. 5: cross section of the annular piston; FIG. 6: rolling element cage; FIG. 7: Isometric cross section of the ring clamping element without the cover part;

FIG. 8: section of the ring clamping element in the lifted position;

Figure 9: Section of the ring clamping element in the clamping position.

Figures 1-9 show a ring clamping element (10). Such ring clamping elements (10) are used, for example, on Werkzeugma machines to brake and / or fix slides relative to rods, for example guide rods. When used, the ring clamping element (10) fully encompasses the guide rod in the radial direction. It has two operating states. One operating state is a released or released position (11) in which the ring clamping element (10) can be moved along the guide rod, see Figure 8. The other operating state is a clamping position (12) in which the ring clamping element (10 ) is jammed against the guide rod for braking and / or blocking. In the figure 9, the clamping position (12) is shown without the rod. The ring clamping element (10) shown in the figures has an annular housing (21) with, for example, a central Stangenauf acquisition (22). The rod receptacle (22) has a circular cross-sectional area. This cross-sectional area is oriented normal to the longitudinal direction (15) of the ring clamping element (10). A longitudinal axis (14) of the ring clamping element (10), which is oriented in the longitudinal direction (15), forms the center line of the rod uptake (22). The rod holder (22) has a nominal diameter of 50 millimeters in the Ausführungsbei play. This nominal diameter corresponds to the outside diameter of the guide rod that can be accommodated in the rod holder (22). When the ring clamping element is released, the diameter of the rod holder (22) is, for example, 0.06% larger than the nominal diameter. The rod receptacle (22) thus has a clearance fit to the guide rod when the ring clamping element (10) is released. For example, the diameter of the rod receptacle (22) is in the tolerance field H8 according to ISO 286. In the clamping position (12) - when the guide rod is not inserted - the diameter can be reduced, for example, to 96% of the nominal diameter. The outside diameter of the ring clamping element (10) in the exemplary embodiment is 2.9 times the nominal diameter. The length of the ring clamping element (10) is, for example, 44% of the nominal diameter. The length of the ring clamping element (10) is thus less than 50% of the nominal diameter of the rod holder (22).

In the exemplary embodiment, a hydraulic connection (13) is arranged on the housing (21). It is also conceivable to arrange two hydraulic connections (13) on the housing (21). These can be arranged on one or on the two opposite end faces (23, 24) of the housing (21) or on the outer surface (25). In the exemplary embodiment, the hydraulic connection (13) sits in the edge area (32) of a cover part (31) of the housing (21). Instead of at least one hydraulic connection (13), at least one pneumatic connection can be provided on the housing (21). The housing (21) comprises a bottom part (51) and the cover part (31) joined to it. In the exemplary embodiment, the parts (31, 51) are screwed together. The fastening screws (26) are inserted into the base part (51) and screwed into threads (33) arranged in the cover part (31). The two parts (31, 51) can, however, also be cohesively connected to one another, for example by means of a welded connection or non-positively and / or positively, for example by means of a screw connection or by means of locking elements. Three locking screws (16) are arranged in the cover part (31) between the edge area (32) and the rod holder (22).

The bottom part (51), see FIG. 2, is designed in the shape of a ring pot. It has a base (52), an inner wall (61) adjoining the rod receptacle (22) and an outer wall (81). The bottom (52) has the shape of a circular ring plate. Its inside (53) pointing in the direction of the housing interior (27) has four circumferential oil channels (54, 55). The outer three of these oil channels (54) are connected to one another by means of a radially oriented oil distribution channel (56). This oil distribution channel (56) is connected in the outer wall (81) to an oil channel (82) introduced there.

The outer wall (81) is designed in the shape of a cylinder jacket. It has a constant thickness and a constant height along the circumference. In the longitudinal direction (15) through bores (83) penetrate the outer wall (81). Sit in these the fastening screws (26). Furthermore, centering pin receptacles (85) are placed on the upper side (84) facing the cover part (31). The inner wall (61) has a cylinder jacket area (62) adjoining the base (52) and a clamping area (71). The inner wall (61) delimits the rod receptacle (22). The cross section of the inner wall (61) in a plane normal to the longitudinal axis (14) is, for example, a closed ring in each sectional plane. The rings in the cylinder jacket area (62), for example, have a different shape than the rings in the clamping area (71).

The cylinder jacket area (62) has a constant wall thickness. The inner diameter of the cylinder jacket region (62) is, for example, 0.2% larger than the nominal diameter of the ring clamping element (10). When the guide rod is inserted, there is a circumferential annular gap between the guide rod and the cylinder jacket area (62). In the embodiment, the length of the cylinder jacket region (62) in the longitudinal direction (15) is 58% of the length of the inner wall (61) in this direction.

The side of the cylinder jacket region (62) facing away from the longitudinal axis (14) delimits a displacement space (17) when the ring clamping element (10) is mounted. This side comprises a guide section (63) adjoining the base (52), for example. The guide section (63) has a cylinder jacket-shaped shape with a circular cross-sectional area. The geometric center axis of the guide section (63) coincides with the longitudinal axis (14). The clamping area (71) forms an area of the inner wall (61) which protrudes upward in the representations of FIGS. 1, 2, 8 and 9. In these representations, it sits free-standing on the cylinder jacket area (62). For example, its inner surface (72) delimits the envelope contour of the rod receptacle (22).

The clamping area (71) has a multiplicity of clamping contact plates (73) and an equal number of relief plates (74). In the exemplary embodiment, the ring clamping element (10) has 12 clamping contact plates (73). The ring clamping element (10) can have a minimum of two clamping contact plates (73). All clamping contact plates (73) have the same geometric shape in the exemplary embodiment. They are arranged uniformly along a pitch circle around the longitudinal axis (14). Each clamping contact plate (73) covers e.g. a sector of 18 degrees.

In the exemplary embodiment shown, the individual clamping contact plate (73) has a cylindrical sleeve-shaped gripping surface (75) oriented to the longitudinal axis and a flat outer surface (76). The outer surface (76) is referred to below as the rolling surface (76). In the illustration of FIGS. 2 and 8, the rolling surfaces (76) form tangential planes on an imaginary cylinder, the center line of which coincides with the longitudinal axis (14). The minimum thickness of the individual clamping contact plate (73) is two thirds of the wall thickness of the cylinder jacket area (62).

The individual rolling surface (76) can also be designed in the shape of a channel. The individual channel then has, for example, a constant cross section and is oriented in the longitudinal direction (15). In this case, when the Ringklemmele element (10) is released, an imaginary cylinder whose center line coincides with the longitudinal axis (14) is touched by all rolling surfaces. This contact takes place in the surface lines of the cylinder. the Curvature center lines of the rolling surfaces are, for example, on radial planes to the longitudinal axis (14).

The individual clamping contact plates (73) are connected to one another, for example, by means of the relief plates (74).

For example, all relief plates (74) have the same geometrical shape. In a plane normal to the longitudinal axis (14), its free surface (77) pointing to the longitudinal axis (14) has a radius which is e.g. 15% of the radius of the gripping surfaces (75) of the clamping contact plates (73) in the same plane. The minimum thickness of the individual relief plate (74) is for example 50% of the minimum thickness of the individual Klemmkon contact plate (73). The inner wall (61) can also be designed without relief plates (74). For example, the clamping contact plates (73) are then spaced apart from one another.

Figures 1 and 3 show the cover part (31). The cover part (31) is annular. The inside diameter corresponds, for example, to the inside diameter of the cylinder jacket region (62). A cover part (31) stiffening the inner ring (34) of the cover part (31) is formed without depressions or elevations.

The cover part (31) has a support ring (35) on its circumference. In the support ring (35) the threaded holes (33) for the fastening screws (26) and the Bolzenaufnah men (36) for the centering bolts (28) are arranged. Furthermore, a channel section (37) of the hydraulic channel (37, 82) penetrates the support ring (35). Spring receptacles (39) are arranged in the central area (38) of the cover part (31) surrounded by the support ring (35). In the exemplary embodiment, the cover part (31) has nine spring receptacles men (39), which are arranged evenly on a common pitch circle. All of these spring receptacles (39) have the same geometric dimensions. The cover part (31) can also be designed without spring receptacles (39).

In Figures 4 and 5, an annular piston (91) is shown in an isometric view and in a cross section. The illustrated annular piston (91) has an envelope contour in the shape of a cylinder jacket in its lower region (92) facing the base (52). Its upper area (101) is frustoconical. The upper area (101) can also have a cylindrical envelope-shaped envelope contour.

In the lower region (92) the annular piston (91) has a sealing ring receptacle (94) on its outer surface (93). A sealing ring (95), e.g. an O-ring (95), sits in this when the ring clamping element (10) is installed. This sealing ring (95) seals the Ringkol ben (91) against the outer wall (81) of the bottom part (51). The maximum outer diameter of the annular piston (91) is in the exemplary embodiment from two tenths of a millimeter smaller than the inner diameter of the outer wall (81) of the bottom part (51).

The area of the maximum outside diameter is designed, for example, as a circumferential, arched annular collar (96).

The upper area (101) has spring element receptacles (102) arranged on a common pitch circle. The diameter of the pitch circle, the number of spring element receptacles (102) and their diameter corresponds to the arrangement of the Federaufnah men (39) in the cover part (31). The depth of the individual spring element receptacles (102) corresponds, for example, to 80% of the length of the annular piston (91) in the longitudinal direction (15). The inner contour of the annular piston (91) has a guide area (111) and a wedge section (121). The Führerbe rich (111) has a guide collar (112) and a sealing ring holder (113). The guide collar (112) has a cylindrical shape. Its center line coincides with the longitudinal axis (14) of the ring clamping element (10). In the assembled state, the guide collar (112) engages the cylinder jacket area (62) of the bottom part (51). Its inner diameter is, for example, five hundredths of a millimeter larger than the outer diameter of the guide section (63) of the bottom part (51).

The sealing ring receptacle (113) is designed circumferentially. When the annular piston (91) is mounted, a sealing ring (114), e.g. in the form of an O-ring (114), seals it against the inner wall (61) of the bottom part (51).

The wedge section (121) sits above the guide area (111) in the illustrations. It delimits an imaginary body designed in the shape of a truncated pyramid. The number of boundary surfaces of the truncated pyramid-shaped body corresponds to the number of wedge surfaces (122) of the wedge section (121). In the exemplary embodiment, this number is identical to the number of rolling surfaces (76) of the bottom part (51). The minimum number of wedge surfaces (122) is two. The imaginary tip of the truncated pyramid shaped Kör pers and its center line lie on a straight line containing the longitudinal axis (14). In the exemplary embodiment, the tip lies above the cover part (31). In the illustrated ring clamping element (10), all wedge surfaces (122) lie in tangential planes on an imaginary cone with a circular base. They touch the cone in one surface line each. The center line and the slope of this cone coincide with the corresponding sizes of the truncated pyramid. The individual wedge surface (122) forms an angle of three degrees with the longitudinal axis (14), for example. This angle is greater than zero degrees and less than 45 degrees. The angle swept by the individual wedge surface (122) in a plane normal to the longitudinal axis (14) is in the exemplary embodiment a third greater than the angle swept over by the individual rolling surface (76) of the bottom part (51) in the same plane. The transitions (123) between the individual wedge surfaces (122) are designed as curved surfaces,

In the representations of Figures 4, 5, 8 and 9, the wedge surfaces (122) are flat surfaces. The wedge surfaces (122) can, however, also be designed as channel-shaped curved surfaces. The individual channel then has a constant cross section along its length, for example. The center line of the Wölbungsra dien a channel lie in a common radial plane to the longitudinal axis (14). In this case, all wedge surfaces (122) touch an imaginary cone with the properties mentioned above, each in a surface line.

The wedge section (121) merges into the guide area (111) in transition surfaces (124). For example, a single wedge surface (122) with a transition surface (124) forms a right angle.

Rolling bodies (131) are arranged between the rolling surfaces (76) and the wedge surfaces (122). In the illustrated game, these are cylindrical rollers (131), the axes of which lie in a plane normal to the longitudinal axis (14). The number of rolling elements (131) corresponds to the number of rolling surfaces (76). A rolling element (131) and a wedge surface (122) are assigned to each rolling surface (76). The ring clamping element (10) can, however, also be designed so that the number of rolling elements (131) is less than the number of rolling surfaces (73) and / or the the wedge surfaces (122). The ring clamping element (10) has at least two rolling elements (131).

All of the rolling elements (131) are held, for example, in a common ring cage (141). FIG. 6 shows such an annular cage (141). The ring cage (141) has a circumferential support ring (142) and arranged on this Wälzkörperaufnah men (143). The rolling element receptacles (143) each consist of a vertical web (144) and two receptacle webs (145) protruding from this in the circumferential direction.

Balls can also be used as rolling elements (131). In this case, the rolling surfaces (76) and the wedge surfaces (122) can be designed either as planes or as grooves. Some rolling elements (131) can also be designed as cylinder rollers (131) and others as balls.

When the ring clamping element (10) is mounted, the spring receptacles (39) of the cover part (31) are offset in the longitudinal direction (15) with respect to the spring element receptacles (102) of the annular piston (91). Here, a spring receptacle (39) of the cover part (31) is assigned to a spring element receptacle (102) of the ring piston (91). In the associated Federauf took (39, 102) sit in the embodiment, two spring elements (151, 152). Both spring elements (151, 152) are designed as compression springs (151, 152). An outer compression spring (151) surrounds an inner compression spring (152).

All inner compression springs (152) and all outer compression springs (151) are connected in parallel to one another. The slope directions of the inner compression springs (152) and the outer compression springs (151) are directed differently, for example. The outer diameter of the outer compression springs (151) is generally management example 1.54 times the outer diameter of the in neren compression springs (152). The wire diameter of the outer compression springs (151) is, for example, 1.3 times the wire diameter of the inner compression springs (152). For example, all spring elements (151, 152) have the same number of turns.

The ring clamping element (10) can also be designed without spring elements (151, 152). For example, the space delimited by the cover part (31) and the annular piston (91) can then be used for a pneumatic or hydraulic medium.

Figure 7 shows the ring clamping element (10) without the cover part (31). The rolling elements (131) are held in the ring cage (141), the support ring (142) of the ring cage (141) being oriented in the direction of the cover part (31). The rolling elements (131) lie on both the rolling surfaces (76) and the wedge surfaces (122). The annular piston (91) is in the Führungsab section (63) of the inner wall (61) of the bottom part (51) in the longitudinal direction (15). In the housing (21), the base (52) and the annular piston (91) delimit the displacement space (17).

The oil distribution channel (56) connects the displacement space (17) with the wall-side hydraulic channel (37, 82). In the representation in FIG. 7, the annular piston (91) is, for example, in an upper end position. The spring elements (151, 152) are shown compressed in this illustration.

The inner wall (61), the annular piston (91) and the rolling elements (131) arranged between them form a multi-wedge gear (41). The frame of this splined gear (41) is the rigid cylinder jacket area (62) of the inner wall (61). The annular piston (91) is guided in a first stroke direction (125) and in a second stroke direction (126) along the Führungsab section (63) of the cylinder jacket region (62) in the longitudinal direction (15). In the illustration of Figure 7 is a first stroke direction (125) directed towards the ventilated position (11) of the small ring element (10). The second stroke direction (126) is directed in the direction of the clamping position (12) of the ring clamping element (10). It is also conceivable to orient the second stroke direction (126) in the direction of the ventilated position (11) and the first stroke direction (125) in the direction of the clamping position (12).

The multi-spline gear (41) can also be designed so that the surfaces of the ring piston (91) designated as wedge surfaces (122) touch an imaginary common cylinder in each case on a surface line. In this case, the rolling surfaces (76) of the clamping contact plates (73) touch an imaginary cone with a circular base, the center line of which lies on a straight line containing the longitudinal axis.

Both the wedge surfaces (122) and the rolling surfaces can also touch imaginary cones with a circular base, the center line of which contains the longitudinal axis (14). The angle of inclination of both cones can be identical or different. The rolling elements (131) arranged between the annular piston (91) and the clamping contact plates (73) enable low-wear operation of the Ringklemmele element (10).

All rolling surfaces (76) thus touch an imaginary first geometric body with a circular base in a surface line. This base area is oriented normal to the longitudinal axis (14). The center line of this first geometric body lies on a straight line which contains the longitudinal axis (14). All wedge surfaces (122) touch an imaginary second geometric body. The second geometric body also has a circular base which is normal to the longitudinal axis (14). The center line of the second geometric body lies on the same straight line as the center line of the first geometric body. At least one of the two geometric Kör is conical in shape. The maximum angle of inclination of the surface lines of the body relative to the longitudinal axis (14) corresponds to the abovementioned critical angle of the wedge surfaces (122).

When assembling the ring clamping element (10), for example, the ring cage (141) with the rolling elements (131) inserted therein is first inserted into the ring piston (91). The spring elements (151, 152) are placed in the spring element receptacles (102) of the annular piston (91) and then the cover part (31) is placed on the annular piston (91). The spring elements (151, 152) are compressed and the locking screws (16) are screwed through the cover part (31) into the locking threads (103) of the annular piston (91).

This unit is inserted into the base part (51) after the sealing elements (95, 114) have been installed. Then the cover part (31) and the bottom part (51) are screwed together ver. A different order of assembly is also conceivable.

After removing the locking screws (16), the relaxing spring elements (151, 152) press the annular piston (91) in the second stroke direction (126) into a lower end position (97), see FIG (13), for example, a hydraulic line is connected via a 3/2-way valve. After the application of hydraulic fluid, the displacement space (17) is enlarged. The annular piston (91) is displaced into an upper end position (98) in the first stroke direction (125) under compression of the spring elements (151, 152), see FIG. 8.His guide collar (112) slides along the guide section (63) ) of the cylinder jacket area (62). Now the ring clamping element (10) be pushed up on a rod with a circular cross-sectional area. The ring clamping element (10) engages around the rod. As soon as the hydraulic pressure in the displacement chamber (17) is verrin, the rod is fixed by means of the ring clamping element (10). The clamp is therefore closed without pressure and is self-locking.

With hydraulic or pneumatic actuation on both sides, the annular piston (91) can be moved in both directions by means of the medium. It is also conceivable for the Ringkol ben (91) to be spring-loaded only in the release direction. In this case, the ring clamping element (10) is used, for example, as a service brake. FIG. 8 shows a cross section of the ring clamping element (10) in the released position (11). The displacement space (17) has its maximum volume. The annular piston (91) is in its upper end position (98). The spring elements (151, 152) are compressed. The rolling elements (131) are located in the lower region of the wedge surfaces (122) and in the upper region of the rolling surfaces (76). The gripping surfaces (75) delimit an imaginary cylinder whose center line coincides with the longitudinal axis (14). The inner wall (61) has its original, undeformed shape. In FIG. 9, the ring clamping element (10) is shown in the clamping position (12). The displacement space (17) has its minimal volume. The annular piston (91) is in its lower end position (97). The spring elements (151, 152) are relieved. The rolling elements (131) are located in the upper area of the wedge surfaces (122) and in the lower area of the rolling surfaces (76). The inner wall (61) is elastically deformed radially in the area of the clamping contact plates (73) in the direction of the longitudinal axis (14).

When the inner wall (61) is deformed, a restoring force is built up as an internal force in the inner wall (61). The thin relief plates (74) are also deformed. The gripping surfaces (75) delimit an imaginary truncated cone, the tip of which lies on the longitudinal axis (14). The tip of the truncated cone is oriented towards the tip of the truncated pyramid of the wedge section (121).

When the ring clamping element (10) is released again, the ring piston (91) is moved in the first stroke direction (125) against the direction of force of the Federele elements (151, 152). Here, the inner wall (61) in the area of the terminal contact plates (73) is relieved, so that the internal force reshapes the inner wall (61) into its undeformed starting position. Combinations of the individual exemplary embodiments are also conceivable.

List of reference symbols:

10 ring clamping element

11 released position 12 clamping position

13 hydraulic connection

14 longitudinal axis

15 longitudinal direction

16 Security screws. 17 Displacement space

21 housing

22 rod holder

23 front side of (21), on the lid part side 24 front side of (21), on the bottom part side

25 outer surface

26 fastening screws

27 Housing interior

28 centering bolts

31 cover part

32 edge area of (31)

33 Thread, threaded hole

34 inner ring 35 support ring

36 pin sockets

37 canal section

38 central area of (31)

39 spring mounts

41 spline gears

51 bottom part

52 floor 53 inside

54 oil channels

55 oil gutter

56 oil distribution duct

61 inner wall

62 cylinder jacket area

63 Guide section 71 Clamping area

72 inner surface

73 Terminal contact plate

74 Relief Plate

75 gripping surface 76 outer surface, rolling surface

77 open space

81 outer wall

82 oil channel 83 through holes

84 top

85 centering pin receptacles

91 annular pistons

92 lower area

93 exterior surface

94 sealing ring mounts

95 Sealing ring, O-ring

96 cuff

97 lower end position of (91)

98 upper end position of (91) 01 upper area of (91) 02 spring element receptacles 103 safety thread

111 guide area 112 guide collar 113 sealing ring mount

114 Sealing ring, O-ring

121 wedge section

122 wedge surfaces

123 transitions

124 transition areas

125 first stroke direction of (91)

126 second stroke direction of (91)

131 Rolling elements, cylindrical rollers

141 ring cage

142 support ring

143 rolling element mountings 144 vertical web

145 support bars

151 spring element, outer spring element, compression spring

152 spring element, inner spring element, compression spring

Claims

Patent claims:

1. Ring clamping element (10) with an annular housing (21) having at least one pneumatic or hydraulic connection (13) and with an annular piston (91) which can be moved in two stroke directions (125, 126) in the direction of its longitudinal direction (15) , characterized,

- That the housing (21) one, a longitudinal axis (14) oriented in the longitudinal direction (15) encompassing a rigid cylinder jacket region (62) with a guide section (63) and at least two clamping contact plates (73), free-standing inner wall (61) ) Has,

- That each clamping contact plate (73) has a rolling surface (76) on its outside,

- That the inner wall (61), the annular piston (91) and at least two rolling bodies mounted between each individual rolling surface (76) and the annular piston (91) form a multi-spline gear (41) whose Ge alternate the cylinder jacket area (62) is,

- So that when the annular piston (91) moves along the guide section (63) in one of its stroke directions (125; 126), the inner wall (61) in the area of the clamping contact plates (73) radially counteracts an internal restoring force of the inner wall (61) is deformed towards the longitudinal axis (14).

2. Ring clamping element (10) according to claim 1, characterized in that the ring piston (91) has a wedge portion (121) with a plurality of wedge surfaces (122), the number the wedge surfaces (122) corresponds to at least the number of Wälzkör by (131).

3. ring clamping element (10) according to claim 2, characterized in that

- that each rolling surface (76) touches a surface line of a common first geometric body with a circular base, the center line of which contains the longitudinal axis (14),

- That each wedge surface (122) touches a surface line of a common second geometric body with a circular base, the center line of which contains the longitudinal axis (14), and

- That of the surface lines of the first geometric body and / or of the surface lines of the second geometric body with a straight line containing the longitudinal axis (14) encloses an angle which is greater than zero and less than 45 degrees.

4. ring clamping element (10) according to claim 1, characterized in that the annular piston (91) is arranged and guided within the housing (21).

5. ring clamping element (10) according to claim 1, characterized in that all of the rolling elements (131) are mounted in a common ring cage (141) of ringför mig design.

6. ring clamping element (10) according to claim 1, characterized in that both the rolling surfaces (76) and the Keilflä Chen (122) are flat surfaces.

7. ring clamping element (10) according to claim 1, characterized in that at least one rolling element (131) is a cylindrical roller (131), the axis of which lies in a normal plane to the longitudinal axis (14) and / or that at least one rolling element ( 131) is a ball guided in at least one channel, the center line of the radii of curvature of this channel being in a radial plane to the longitudinal axis (14).

8. ring clamping element (10) according to claim 1, characterized in that the clamping area (71) between the Klemmkontaktplat th (73) arranged relief plates (74).

9. ring clamping element (10) according to claim 1, characterized in that the annular piston (91) is spring-loaded in one of its stroke directions relative to the housing (21).

10. ring clamping element (10) according to claim 1, characterized in that the hydraulic or pneumatic connection (13) with a in the housing (21) arranged, by means of the annular piston (91) limited displacement space (17) verbun is the.