EP1877670B1 - Braking and/or clamping device comprising an anti-friction wedge gear - Google Patents

Abstract

The invention relates to a braking and/or clamping device, which at least partially surrounds a rod (1) that can be displaced in relation to said device. The braking and/or clamping device comprises at least one wedge gear comprising a wedge (41) that can be displaced at least approximately parallel to the rod and a ram (43) that can be displaced at least approximately radially to the rod, an actuating device that acts on the wedge and a release device that acts on the wedge. The actuated ram presses a clamping sleeve against the rod in a radially pre-stressed manner. In addition, at least one part of the expansion joints of the wedge gear are configured to reduce friction. The invention provides a braking and/or clamping device, which produces a high clamping force with a compact construction.

Description

The invention relates to a braking and / or clamping device, which surrounds a rod movable relative to it at least partially, wherein the brake and / or clamping device at least one wedge gear with a movable at least approximately parallel to the rod wedge and at least approximately radially to the rod Plunger, an acting on the wedge actuator and acting on the wedge release device comprises, wherein at least the movement joint of the wedge gear between the wedge and the plunger is designed roller bearings.

From the product information no. F 10 of Sitema GmbH & Co. KG, "Double-acting locking units", 03/03, such a device is known. A sleeve-shaped wedge with an inner cone acts on a clamping sleeve with an outer cone. This device has a low efficiency because high friction losses occur during actuation and release.

From the JP 11013714 A is a brake without a ram known. Between a ring wedge and a cylindrical sleeve with a brake lining held in a cage balls of different diameters are arranged.

From the US 2002/0185342 A1 is known an electromagnetically releasable brake. The brake comprises a spring-loaded wedge gear, wherein between the flying wedge and a brake shoe, a flat cage roller bearing is arranged. The rail to be braked with its side facing away from the brake shoe is permanently against a friction lining.

The present invention is therefore based on the problem of developing a brake and / or clamping device that enables a high clamping force in a compact design.

This problem is solved with the features of the main claim. For this purpose, the actuated plunger presses a clamping sleeve radially biased to the rod. In addition, the movement joint of the wedge gear is designed roller-mounted between the wedge and the housing of the brake and / or clamping device.

Figur 1:

Dimetrischer Schnitt einer Klemm- und/oder Bremsvorrichtung;

Figur 2:

Teillängsschnitt durch eine Vorrichtung nach Figur 1 im gelüftete Zustand;

Figur 3:

Teillängsschnitt durch eine Vorrichtung nach Figur 1 im betätigten Zustand;

Figur 4:

Querschnitt durch eine Vorrichtung nach Figur 1;

Figur 5:

Klemmhülse;

Figur 6:

Prinzipskizze einer gelüfteten Brems- und/oder Klemmvorrichtung;

Figur 7:

Prinzipskizze einer betätigten Brems- und/oder Klemmvorrichtung.

Further details of the invention will become apparent from the dependent claims and the following description of a schematically illustrated embodiment.

FIG. 1:

Dimetric cut of a clamping and / or braking device;

FIG. 2:

Partial longitudinal section through a device after FIG. 1 in the released state;

FIG. 3:

Partial longitudinal section through a device after FIG. 1 in the actuated state;

FIG. 4:

Cross section through a device according to FIG. 1 ;

FIG. 5:

Ferrule;

FIG. 6:

Schematic diagram of a ventilated brake and / or clamping device;

FIG. 7:

Schematic diagram of an actuated brake and / or clamping device.

The FIGS. 1 to 4 show longitudinal and cross sections of a brake and / or clamping device (10), for example a lifting brake (10). The Hubbremse (10) engages around a through the Hubbremse (10) guided bar (1), for example, on both end faces (11, 12) protrudes from the Hubbremse (10). In the illustrated embodiment, the Hubbremse (10) engages around the rod (1) completely. The Hubbremse (10), the But also encompass rod (1) in a segment, wherein the segment angle is at least 210 angular degrees. The rod (1) is at least in the axial direction - in the direction of the longitudinal axis of the rod (1) - relative to the lifting brake (10) movable.

The rod (1), for example, has a cylindrical cross-section with its diameter e.g. 28 mm. The rod (1) may for example also have an elliptical, oval, square, rectangular, triangular or polygonal cross-section. It can e.g. a lifting rod, a horizontal or inclined guide rod, a piston rod, etc.

The lifting brake (10) comprises an example cylindrical housing (13) in which a e.g. six wedge gear (41), an actuator (81) and a release device (91) are arranged. To activate the release device (91), a pneumatic connection (14) is provided on the housing (13), for example.

The housing (13) has, for example, a length of 160 mm and a diameter of 135 mm. It consists for example of a main housing part (15) and an adapter housing part (16) screwed thereto. At its two front ends, it is each closed with a lid (17, 18). In this case, the support cover (17) is screwed onto the main housing part (15) and the connection cover (18) onto the adapter housing part (16). The individual components (15-18) can also be connected to one another by means of connecting elements, eg screws. For this purpose, the individual components (15-18) may have, for example, through-holes and / or threads. A version with flanges or Zugankerbauweise is conceivable.

The main housing part (15) has, for example, the shape of a tube whose length is about 60% of the length of the lifting brake (10). Both pipe ends carry external thread (21) for receiving the connection components (16, 17). The inner wall (22) has, for example, six continuous guide grooves (23), cf. the Figures 2-4 , The width of the guide grooves (23) in this embodiment is 12% of the diameter of the main housing part (15). The main housing part (15) also has about 25% of its length, seen from the adapter housing part (16), threaded holes (24), for example, located centrally in the guide grooves (23).

In each guide groove (23) sits in each case a cuboid guide block (19) whose length corresponds approximately to half the length of the main housing part (15). These guide pads (19) are e.g. by means of stud bolts (25), which sit in the threaded holes (24) attached. The radially inwardly oriented surface (26) of the guide blocks (19) is hardened, for example. The guide blocks (19) may also be part of the main housing part (15).

Each guide block (19) supports a wedge gear (41). The single wedge gear (41) comprises a wedge (42) located close to the guide block (19) and a plunger (43) close to the rod (1). The wedges (42) are movable in a direction parallel to the rod (1). Between the guide blocks (19) and the wedges (42) rolling elements (44) are arranged. These rolling elements (44) are, for example, rollers (44) which are held by cages (45). The axes of the rollers (44) are transverse to the axis of the rod (1). The center distance of the outermost rollers (44) to each other here is 72% of the length of the guide blocks (19). The length of the entire roller guides (44, 45) corresponds in the embodiment about 95% of the length of the guide blocks (19). The cages (45), eg plastic or metal cages, have an H-shaped cross section, see. FIG. 4 , In this case, the two lateral webs (56, 57) project over the guide blocks (19) and the wedges (42) and guide the two parts (19, 42) to each other transversely to the guide direction of the roller guides (44, 45).

The wedges (42) are, for example, 25% longer than the guide blocks (19), cf. the Figures 2 and 3 , In the case of the ventilated lifting brake (10) shown in FIG. 2, they protrude in the direction of the actuating device (81) in the release direction (3) via the guide blocks (19). If the lifting brake (10) is actuated, cf. FIG. 3 , The wedges (42) in the direction of the release device (91), in the actuation direction (2), via the guide pads (19) over. For example, at least the running surfaces (53) for the rolling elements (44) and the wedge surfaces (54) facing away from them are hardened on the wedges (42), but the wedges (42) can also be through hardened. The wedge surfaces (54) of the wedges (42) have a pitch of eg 1 degree. The wedges (42) taper in this embodiment in the direction of the release device (91).

Between the wedge surfaces (54) and the plungers (43) is in each wedge gears (41) each example, another roller guide (46, 47). The construction and the geometric dimensions of these roller guides (46, 47) correspond, for example, to the structure and the geometrical dimensions of the roller guides (44, 45). As rolling elements (44, 46) instead of in the FIGS. 1 and 4 Rolls also shown balls, needles, etc. are used. The two lateral webs (58, 59) of the cages (47) project over the wedges (42) and the plungers (43). As a result, they prevent a lateral offset, cf. Figure 4, the two components (42, 43) to each other.

The length of the plunger (43) corresponds here to the length of the guide blocks (19). In the embodiment described here, the plungers (43) taper in the direction of the actuating device (81). Their possibly hardened tops (61) have e.g. the same pitch as the wedge surfaces (54) of the wedges (42). The lower sides (62) are flat surfaces. At least one normal to each of these surfaces intersects the centerline of the rod (1). The plungers (43) can also be through hardened.

For a movement in the clamping direction (4), cf. FIG. 3 , the plunger (43), for example, through the lid (17) and the adapter housing part (16) are guided. The guide surfaces (27, 31) of these components (16, 17) have a small distance from the end faces (63, 64) of the plunger (43). This distance is a maximum of a few tenths of a millimeter. Optionally, the guide surfaces (27, 31) and / or the end faces (63, 64) of the plungers (43) may be lubricated or coated with a self-lubricating surface. The use of rolling elements is conceivable.

The undersides (62) of the plunger (43) act on a clamping sleeve (71), see. the Figures 1 - 4 , This clamping sleeve (71) engages in the embodiment of the rod (1) completely. It protrudes into a central bore (32) of the lid (17). In the axial direction, cf. the Figures 2 and 3 , Its position is limited by the central bore (32) and the guide surface (27) of the adapter housing part (16). Here, at least between the clamping sleeve (71) and the guide surface (27) has a movement joint (72). The clamping sleeve (71) can be fixed in the radial and axial direction through the central bore (32) of the lid (17).

The clamping sleeve (71) is as an item in the FIG. 5 shown. Their length is for example 82.5 mm. It has a hollow cylindrical base body (73) with a maximum outer diameter of eg 47 mm. The inner diameter is a few hundredths of a millimeter larger than the rod diameter, so that the clamping sleeve (71) is easily pushed onto the rod (1). The material of the clamping sleeve (71) is for example a metallic or a non-metallic material. A composite material can also be used. The clamping sleeve (71) can be made eg by powder metallurgy.

The base body (73) has, for example, six circumferentially uniformly distributed longitudinal slots (74) whose length is e.g. 90% of the length of the body (73) is. These longitudinal slots (74), their width is e.g. 3 mm, each end in a relief hole (75). They divide clamping elements (76) from each other. These clamping elements (76) have on their outer sides (77) e.g. milled ram support surfaces (78). These are, for example, flat planar surfaces on which the plungers (43) rest over the entire surface after assembly of the brake and / or clamping device (10). The plungers (43) thus sit e.g. positively in the clamping sleeve (71). The single plunger bearing surface (78) can also have the width of a clamping element (76).

The inner walls of the clamping elements (76) are the friction and / or brake pads (79), which bear against the rod (1) during braking and / or when clamping the device (10). Optionally, the friction and / or brake pads (79) may be applied as a coating on the inner wall of the clamping sleeve (71).

The actuating device (81) comprises, for example, six springs (82) which are arranged between a ring plate (83) and the support cover (17). The annular plate (83) rests with its wedge-side (84) on the end faces (51) of all wedges (42). The springs (82), e.g. Coil springs (82), sitting in depressions (86) of the wedges (42) facing away from the spring system side (85) of the annular plate (83). These depressions (86) are arranged on a regular pitch circle. The thickness of the annular plate (83) in the region of the depressions (86) is e.g. 4 mm. The imaginary center lines (87) of the springs (82) penetrate the wedge (42) at least approximately centrally. The cover-side support surface (33) of the springs (82) is for example a plane surface.

The number of springs (82) may be higher or lower than the number of wedge gears (41). Thus, e.g. a brake and / or clamping device (10) with six wedge gears (41) comprise an actuating device (81) with three springs (82). The center lines (87) of the springs (82) can lie in the direction of actuation (2) of the wedge (42), without penetrating the latter.

The in the Figures 1 - 3 shown springs (82) are, for example, coil springs (82) having a rectangular cross-section. But it can also springs (82) are used with circular cross-section, disc springs, etc.

The actuating device (81) can also be operated hydraulically, pneumatically or by means of a motor. For example, in a hydraulic actuator, the annular plate (83) may be the piston of a cylinder-piston unit or connected to this piston. The use of a piezoelectric element or a shape memory element is conceivable.

The release device (91) comprises, for example, two series-connected pneumatically operated cylinder-piston units (92, 93, 94, 95) which act on the release side (52) of the wedges (42). The pistons (93, 95) of both cylinder-piston units (92, 93, 94, 95) are interconnected by means of piston rods (96).

The cylinder (92) is a ring cylinder formed by the adapter housing (16). The piston (93) is an annular piston (93) whose outer diameter is 117 mm, for example, and whose inner diameter is 36 mm, for example. In its bore (101) and on its outer circumference it carries sealing elements (102, 103), eg O-rings. In the assembled state, cf. the Figures 1 - 3 the adapter housing part (16) projects like a spike through the bore (101) of the annular piston (93). The piston surface (104) has a depression (105) whose area is, for example, 75% of the piston area (104). The annular piston (93) in this embodiment, for example, six in the direction of the wedge gear (41) projecting fingers (106). These are flush with the outer peripheral contour of the annular piston (93) and lie in the assembled state, see. the FIGS. 1 and 4 , in the space between the guide blocks (19). The fingers (106) are here shorter by a few millimeters than the wedges (42). Instead of six fingers (106), the annular piston (93) may, for example, comprise three fingers (106), which then lie, for example, in every other intermediate space between the guide blocks (19). Optionally, the piston (93) without fingers (106) may be executed.

In the assembled brake and / or clamping device (10) are all wedges (42) with their release side (52) on the wedge contact surface (107) of the annular piston (93).

The cylinder (94) is a ring cylinder formed by the terminal cover (18). In this cylinder (94) of the annular piston (95) slidably mounted on a lid mandrel (37). The piston surface (111) facing the cover (18) is e.g. 5% larger than the piston surface (104) - has a recess (112) whose area is more than 50% of the piston surface (111).

The lid (18) has a feed channel (35) through which e.g. Air from the pneumatic port (14) in the piston (95) and the lid (18) limited cylinder space (113) is promoted.

On the piston rod side (114) facing away from the cylinder space (113) are the e.g. six piston rods (96) inserted into the annular piston (95). These piston rods (96) are arranged, for example, such that their imaginary center line penetrates, at least approximately centrally, the release sides (52) of the wedges (42). Each piston rod (96) has a central piston rod bore (97) which is aligned with a piston bore (115) in the piston (95). The interior of the piston rod bore (97) is thus connected to the cylinder chamber (113). The piston rods (96) are guided sealed by the adapter housing (16) and abut the annular piston (92). A radial opening (117) here connects the piston rod bore (97) with the cylinder chamber (108), which is bounded by the adapter housing (16) and the annular piston (93).

The number of piston rods (96) of the release device (91) may be lower or higher than the number of wedge gears (41). The release device (91) can also be designed so that the imaginary center lines of the piston rods (96) extend parallel to the release direction (3) of the wedges (42) and do not penetrate the wedges (42).

Optionally, the pneumatic release device (91) shown here can be designed with only one annular piston (93). The adapter housing part (16) then has a pneumatic connection (14) and closes off the housing (13). On the second annular piston (95) and the piston rods (96) can then be omitted. An embodiment with three or more or more connected in series pistons is conceivable.

Instead of a pneumatic drive, the release device (91) can be operated hydraulically or by means of a motor. The use of piezo elements or a shape memory element is conceivable.

The terminal cover (18) has on its outer side mounting holes (36) with which the brake and / or clamping device (10) on a relative to the rod (1) movable component can be attached.

When mounting the brake and / or clamping device (10), for example, the guide blocks (19) are first inserted into the main housing part (15) and secured by means of the stud bolts (25). Optionally, each guide pad (19) can be secured by means of two adjusting or stud screws (25) to allow radial adjustment of the guide pads (19).

After inserting the roller guides (44, 45) and the wedges (42) then, for example, the roller guides (46, 47) and the plunger (43) from the side of the release device (91) from inserted. From this side of the annular piston (93) is inserted so that the fingers (106) lie between the guide blocks (19). Subsequently, the adapter housing part (16) to the main housing part (15) are screwed. Here, the adapter housing part (16) is adjusted so that a small guide gap to the plungers (43) remains and that the bores (28) for the piston rods (96) are aligned with the wedges (42).

In the next assembly step, for example, the annular piston (95) is inserted with the piston rods (96) preassembled on it in the adapter housing (16) and then the fastening cover (18) screwed onto the adapter housing part (16).

From the side of the actuating device (81), the clamping sleeve (71) can now be inserted in such a way that the clamping elements (76) lie under the plungers (43). Optionally, for mounting the clamping sleeve (71) to move the wedges (42) in the release direction (3). This can be done during assembly by hand or by means of the release device (91).

To complete the brake and / or clamping device (10), the ring plate (83) and the springs (82) are now used. Here, the annular plate (83) is inserted so that the depressions (86) are aligned with the wedges (42). To close the housing (13), the lid (17) is screwed onto the main housing part (15). After assembly, the clamping sleeve (71) can be removed outside the clamping elements (76), e.g. be fixed by the cover (17) in the radial and / or axial direction.

The order of the assembly steps can also be chosen differently. In this case, individual components can be connected to each other, for example by means of fasteners. To adjust the guide and movement joints (72, 66, 67) adjustment means may be provided.

To center the braking and / or clamping device (10), this may e.g. be aligned with a gauge. For this purpose, a teaching mandrel whose cross section is identical to the cross section of the rod (1), in the brake and / or clamping device (10) used. Now, by adjusting the guide pads (19), the friction pads (79) can be made e.g. be adjusted so that the housing (13) relative to the rod (1) is centered.

When mounting the brake and / or clamping device (10) on the rod (1), the brake and / or clamping device (10), for example, when activated release device (91) on the rod (1) is pushed. Hereinafter, the brake and / or clamping device (10) is e.g. attached to a tool carriage which is movable relative to the rod (1).

If the pneumatic pressure of the release device (91) is turned off, the actuator (81) pushes the wedge gear (41) of the in the FIG. 2 shown vented position of the brake and / or clamping device (10) in the in FIG. 3 shown actuated position of the brake and / or clamping device (10). Here, by means of the springs (82), the annular plate (83) in the actuation direction (2) is moved. The annular plate (83) presses all the wedges (42) in this direction, with the wedges (42) rolling along the rollers (44). The wedge stroke is for example 10 mm. The roller guides (44, 45) in this movement joint (66) are in this case offset by half the stroke of the wedges (42). The wedges (42) move the pistons (93, 95) eg in the in FIG. 3 illustrated right end position. In this case, for example, the compressed air from the cylinder chambers (108, 113) escape through quick exhaust valves.

During their movement, the wedges (42) simultaneously roll along the rolling elements (46). Also in the movement joint (67), the roller guides (46, 47) are shifted by half the wedge stroke. At the same time, the plungers (43), which also roll on the rolling elements (46), are displaced radially in the direction of the rod (1). In this clamping direction (4) they are guided by means of the guide surfaces (27, 31). The plunger (43) press in the clamping direction (4) the brake pads (79) under elastic deformation of the clamping elements (76) of the clamping sleeve (71) against the rod (1). The clamping force in this embodiment corresponds to about sixty times the spring force. The clamping sleeve (71) is biased in the radial direction. Hereby, for example, a moving tool carriage is decelerated or, in the case of a stationary tool carriage, the rod (1) is clamped to hold the position.

The clamping and / or braking takes place without delay when removing the pneumatic pressure. Even if the brake and / or clamping device (10) is not actuated for a longer period of time, speaks the brake and / or clamping device (10) due to the low start-up and rolling friction of the rolling guides (44, 45, 46, 47) in the movement joints (66, 67) immediately. Thus, a safe emergency braking function is guaranteed.

To release the brake and / or clamping device (10), the pneumatic connection (14) is connected, for example, to the compressed air network. The brake and / or clamping device (10) will now from the in the FIG. 3 shown, the rod (1) clamping state in the in the FIG. 2 converted dissolved state shown.

The incoming compressed air penetrates into the cylinder chamber (113) and through the piston rod bore (97) into the cylinder chamber (108). The pistons (93, 95) are displaced in the release direction (3). The fingers (106) prevent tilting of the piston (93). The force transmitted to the wedges (42) is the sum of the thrust forces of the pistons (93) and (95). Hereby, a high force for releasing the brake and / or clamping device (10) is generated with this compact release device (91). The wedges (42) are guided in the release direction (3) by the roller guides (44, 45) and also push the ring plate (83) in the release direction (3). Here, the springs (82) are compressed.

The elastically deformed clamping sleeve (71) presses the plungers (43) against the roller guides (46, 47) with the reshaping of the clamping elements (76). When lifting the friction linings (79), the rod (1) is released. For example, the tool carriage can now be moved freely again. During the ventilation of the brake and / or clamping device (10), the roller guides (44, 45, 46, 47) remain permanently loaded.

The required release force is approximately constant, since the starting friction of the roller guides (44, 45, 46, 47) is only slightly higher than the rolling friction.

Since only slight friction losses occur during actuation and when the brake and / or clamping device (10) is actuated, this device (10) has a high degree of efficiency. Despite their compact dimensions, high braking and / or clamping forces can be achieved with this device (10).

The brake and / or clamping device (10) can be used for different rod diameter. For a rod (1) of smaller diameter, for example, the clamping sleeve (71) is replaced by a clamping sleeve, which at least in the field of Friction and / or brake pads (79) has a smaller inner diameter.

The braking and / or clamping device (10) may be e.g. be executed with three wedge gears (41). In cross section, these are then e.g. arranged at an angle of 120 degrees to each other.

The wedge gear (41) may also include a cone-shaped wedge and a cone-shaped ram. The rolling elements in the movement joints are then, for example, ball sleeves with or without ball return.

The brake and / or clamping device (10) requires only a small amount of maintenance. It can therefore also be installed in hard to reach areas of a system.

The FIGS. 6 and 7 show schematic diagrams of a ventilated and an actuated brake and / or clamping device (10). The clamping sleeve (71) is shown here with an elastic joint (121), for example a film hinge (121). If the brake and / or clamping device (10) is released, cf. FIG. 6 , There is a gap (6) between the friction and / or brake pads (79) and the rod (1).

Upon actuation of the brake and / or clamping device (10), the clamping elements (76) with the friction and / or brake linings (79) by means of the wedge gear (41) against the rod (1) pressed. The elastic joint (121) is deformed in this case and thus the clamping sleeve (71) radially biased pressed against the rod (1).

LIST OF REFERENCE NUMBERS

1

pole

2

actuation direction

3

release direction

4

Brake and / or clamping direction

6

gap

10

Brake and / or clamping device, Hubbremse

11, 12

End faces of (10)

13

casing

14

pneumatic connection

15

The main body portion

16

Adapter housing part

17

Cover, support cover

18

Lid, connection cover, mounting cover

19

guide blocks

21

external thread

22

inner wall

23

guide

24

threaded holes

25

studs

26

Surface of (19)

27

Guide surfaces of (16)

28

Drilling in (16)

29

Seals in (28)

31

Guide surfaces of (17)

32

Central drilling of (17)

33

Support surface of (17)

35

Feed channel in (18)

36

mounting holes

37

cover Dorn

41

spline gear

42

wedges

43

tappet

44

Rolling elements, part of the roller guide, rollers

45

Cages, part of the roller guide

46

Rolling elements, part of the roller guide, rollers

47

Cages, part of the roller guide

51

End faces of (42), actuation side

52

End faces of (42), release side

53

Treads of (42)

54

Wedge surfaces of (42)

56, 57

Footbridges of (45)

58, 59

Footbridges of (47)

61

Topsides of (43)

62

Subpages of (43)

63, 64

End faces of (43)

66, 67

Expansion joints

71

collet

72

Expansion joints

73

body

74

longitudinal slots

75

relief wells

76

clamping elements

77

outsides

78

Shock pad surfaces

79

Friction and / or brake pads

81

actuator

82

Springs, coil springs

83

ring plate

84

Wedge plant side of (83)

85

Spring plant side of (83)

86

depression

87

Centerlines of (82)

91

release device

92

cylinder

93

Piston, ring piston

94

cylinder

95

Piston, ring piston

96

piston rods

97

Piston rod bore

101

drilling

102, 103

sealing elements

104

Piston area of (93)

105

depression

106

finger

107

Wedge contact surface

108

cylinder space

111

Piston area of (95)

112

Sinking into (111)

113

cylinder space

114

Piston rod side

115

piston bore

117

radial opening in (96)

121

Joint, film joint

Claims (11)

1. Braking and/or clamping device (10) encompassing - at least partly - a bar (1) that is movable relative to said braking and/or clamping device (10), said braking and/or clamping device (10) being comprised of at least one wedge gear (41) with a wedge (42) that moves in such a way as to be at least approximately concurrent to said bar (1), of one tappet (43) that moves radially - at least to a certain extent - relative to said bar (1), of an actuating device (81) affecting said wedge (42) and of a releasing device (91) affecting said wedge (42), with at least the motion joint (67) of said wedge gear (41) having roller bearings between said wedge (42) and said tappet (43)
   wherein

   - the actuated tappet (43) presses a radially pre-loaded taper clamping sleeve (71) against said bar (1),

   - and the motion joint (66) of said wedge gear (41) has roller bearings between said wedge (42) and the housing of said (13) braking and/or clamping device.
2. The braking and/or clamping device of claim 1, wherein rolling elements (46) are mounted between said wedge (42) and said tappet (43), and wherein said rolling elements (44) guide said wedge (42) concurrently to said bar (1).
3. The braking and/or clamping device of claim 1, wherein said device is comprised of six wedge gears (41) arranged radially.
4. The braking and/or clamping device of claim 3, wherein said rolling elements (44, 46) are part of the rolling guides (44, 45; 46, 47).
5. The braking and/or clamping device of claim 1, wherein said actuating device (81) encompasses an annular, spring-loaded plate (83) co-operating with said wedge (42).
6. The braking and/or clamping device of claim 5, wherein the number of springs (82) corresponds to the number of wedge gears (41).
7. The braking and/or clamping device of claim 1, wherein said releasing device (91) is comprised of at least one pneumatic cylinder-piston unit (92, 93).
8. The braking and/or clamping device of claim 7, wherein the piston (93) of said cylinder-piston unit (92, 93) is an annular piston (93).
9. The braking and/or clamping device of claim 8, wherein said annular piston (93) co-operates with said wedge (42).
10. The braking and/or clamping device of claim 7, wherein the releasing device (91) is comprised of a second cylinder-piston unit (94, 95) with a second annular piston (95), both annular pistons (93, 95) being connected to each other by piston rods (96).
11. The braking and/or clamping device of claim 10, wherein the number of piston rods (96) corresponds to the number of wedge gears (41).

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