WO2006108387A1

WO2006108387A1 - Braking and/or clamping device comprising an anti-friction wedge gear

Info

Publication number: WO2006108387A1
Application number: PCT/DE2006/000624
Authority: WO
Inventors: Günther Zimmer; Martin Zimmer
Original assignee: Zimmer Guenther; Martin Zimmer
Priority date: 2005-04-11
Filing date: 2006-04-10
Publication date: 2006-10-19
Also published as: EP1877670B1; DE502006005109D1; EP1877670A1; DE102005016723A1; ATE445784T1

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

Brake and / or clamping device with roller bearings

spline gear

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.

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, since high friction losses occur during actuation and release.

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, at least some of the movement joints of the wedge gear are designed roller bearings.

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

Figure 1: Dimetric section of a clamping and / or braking device;

FIG. 2: partial longitudinal section through a device according to FIG. 1 in the released state; FIG. 3: partial longitudinal section through a device according to FIG. 1 in the actuated state; FIG. 4: cross section through a device according to FIG. 1; FIG. 5: clamping sleeve; Figure 6: Schematic sketch of a ventilated brake and / or

Clamping device;

Figure 7: schematic diagram of an actuated brake and / or clamping device.

Figures 1 to 4 show longitudinal and cross sections of a brake and / or clamping device (10), for example a lifting brake (10). The lifting brake (10) engages around a rod (1) guided through the lifting brake (10), which protrudes from the lifting brake (10), for example, on both end faces (11, 12). 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) lent 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 e.g. 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 by means of connecting elements, e.g. Screws to be connected. For this purpose, the individual components (15-18), e.g.

Through holes and / or thread have. 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. 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, lie 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 axial spacing of the outermost rollers (44) relative to one another here amounts to 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 transverse cut, cf. FIG. 4. The two lateral webs (56, 57) project beyond the guide blocks (19) and the wedges (42) and guide the two parts (19, 42) 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. FIGS. 2 and 3. In the case of the ventilated lifting brake (10) shown in FIG. 2, they project over the guide blocks (19) in the direction of the actuating device (81) in the release direction (3). If the lifting brake (10) is actuated, cf. 3, the wedges (42) project in the direction of the release device (91), in the actuation direction (2), over the guide blocks (19). 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 e.g. 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 the rollers shown in Figures 1 and 4 also balls, needles, etc. can be 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 upper sides (61) have, for example, 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. 3, the plungers (43) are e.g. through the lid (17) and the adapter housing part (16). 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 also conceivable.

The undersides (62) of the plunger (43) act on a clamping sleeve (71), see. 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. Figures 2 and 3, their position by the central bore (32) and the guide surface (27) of the adapter housing part (16) is limited. 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 shown as an individual part in FIG. 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) can easily be 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) can 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), for example helical springs (82), are seated in depressions (86) of the spring bearing side (85) of the annular plate (83) facing away from the wedges (42). These depressions (86) are arranged on a regular pitch circle. The thickness of the ring plate (83) in the region of the depressions (86) is for example 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 springs (82) illustrated in Figures 1-3 are e.g. Coil springs (82) with 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 outside diameter is e.g. 117 mm and its inner diameter is 36 mm, for example. In its bore (101) and on its outer circumference it carries sealing elements (102, 103), e.g. O-rings. In the assembled state, cf. Figures 1 - 3 protrudes the adapter housing part (16) like a mandrel through the bore (101) of the annular piston (93). The piston surface (104) has a recess (105) whose area is e.g. 75% of the piston area (104). The annular piston (93) has in this embodiment, for example, six in the direction of the wedge gear (41) protruding fingers (106). These are flush with the outer peripheral contour of the annular piston (93) and lie in the assembled state, see. Figures 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). For example, instead of six fingers (106), the ring piston (93) may comprise three fingers (106), which may then be e.g. lie in every second 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 lid (18) facing the piston surface (111) - it is, for example, 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) in the

Ring piston (95) used. 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 delimited 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 terminal (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 piezoelectric 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 block (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 wedges (42), then e.g. 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 pads (19). Subsequently, the Adapterge¬

ll Housing part (16) are screwed to the main housing part (15). 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) with the piston rods (96) preassembled on it is inserted into the adapter housing (16) and then the fastening cover (18) is 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 cover (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 brake and / or clamping device (10), this can be aligned, for example, on a teaching mandrel. 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 linings (79) can be adjusted, for example, 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 switched off, the actuating device (81) pushes the wedge gear (41) from the released position of the brake and / or clamping device (10) shown in FIG. 2 into that shown in FIG 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) pushes 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), for example, into the right end position shown in FIG. 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), radially in the direction of

Rod (1) moved. In this clamping direction (4) they are guided by means of the guide surfaces (27, 31). The plungers (43) press in the clamping direction (4) the brake pads (79) with 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 braking and / or clamping device (10) is now transferred from that shown in Figure 3, the rod (1) ^■ clamping state in the illustrated in Figure 2 the released state.

The incoming compressed air penetrates into the cylinder chamber (113) and through the piston rod bore (97) into the cylinder derraum (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.

Figures 6 and 7 show schematic diagrams of a ventilated and an actuated brake and / or clamping device (10). The Klexnmhülse (71) is here with a resilient joint (121), e.g. a film hinge (121) shown. If the brake and / or clamping device (10) is released, cf. 6, there is a gap (6) between the friction and / or brake linings (79) and the rod (1).

Upon actuation of the brake and / or clamping device (10), the clamping element (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 direction of actuation 3 release direction

4 brake and / or clamping direction

6 gap

10 Brake and / or clamping device, Hubbrake 11, 12 end faces of (10)

13 housing

14 Pneumatic connection

15 Main body 16 Adapter body

17 Lid, support lid

18 Lid, connection cover, mounting cover

19 guide blocks

21 external thread

22 inner wall

23 guide grooves

24 threaded holes

25 stud bolts 26 surface of (19)

27 guide surfaces of (16)

28 holes 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 fixing holes

37 cornucopia

41 wedge gear 42 wedges

43 pestles

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 running surfaces of (42) 54 wedge surfaces of (42)

56, 57 Footbridges from (45)

58, 59 webs of (47)

61 tops of (43)

62 subpages of (43)

63, 64 faces of (43)

66, 67 movement joints

71 clamping sleeve

72 movement joints 73 basic body

74 longitudinal slots 75 relief holes

76 nipping ducks

77 outsides

78 ram support surfaces

79 friction and / or brake pads 81 actuator

82 springs, coil springs

83 Ring plate 84 Wedge side of (83)

85 spring system side of (83)

86 depression

87 centerlines of (82)

91 release device

92 cylinders

93 pistons, ring piston

94 cylinders

95 pistons, ring pistons 96 piston rods

97 piston rod bore

101 bore 102, 103 sealing elements 104 piston surface of (93)

105 depression

106 fingers

107 wedge contact surface

108 cylinder space

111 piston area of (95)

112 depression in (111)

113 cylinder space

114 piston rod side 115 piston bore

117 radial opening in (96)

121 joint, film joint

Claims

claims:

1. Braking and / or clamping device which engages around a rod movable relative to it at least partially, wherein the brake and / or clamping device comprises at least one wedge gear with a wedge movable at least approximately parallel to the rod and a plunger movable at least approximately radially to the rod, an actuating device acting on the wedge and a release device acting on the wedge, characterized in that the actuated plunger (43) presses a clamping sleeve (71) radially biased against the rod (1) and that at least a part of the movement joints (66, 67) of the wedge gear are designed roller bearings.

2. Braking and / or clamping device according to claim 1, characterized in that between the wedge (42) and the plunger (43) rolling elements (46) are arranged and that the wedge (42) by means of rolling elements (44) parallel to the rod ( 1) is guided.

3. Braking and / or clamping device according to claim 1, characterized in that it comprises six star-shaped wedge gear (41).

4. Braking and / or clamping device according to claim 3, characterized in that the rolling elements (44, 46) are part of RoI lenführungen (44, 45, 46, 47).

5. Braking and / or clamping device according to claim 1, characterized in that the actuating device (81) comprises a with the wedge (42) cooperating spring-loaded annular plate (83).

6. Braking and / or clamping device according to claim 5, that the number of springs (82) corresponds to the number of wedge gear (41).

7. Braking and / or clamping device according to claim 1, characterized in that the release device (91) comprises at least one pneumatic cylinder-piston unit (92, 93).

8. Braking and / or clamping device according to claim 7, characterized in that the piston (93) of the cylinder-piston unit (92, 93) is an annular piston (93).

9. Brake and / or clamping device according to claim 8, characterized in that the annular piston (93) cooperates with the wedge (42).

10. Braking and / or clamping device according to claim 7, characterized in that the release device (91) comprises a second cylinder-piston unit (94, 95) with a second annular piston (95), wherein the two annular piston (93, 95) by means of Piston rods (96) are interconnected.

11. Braking and / or clamping device according to claim 10, characterized in that the number of piston rods (96) corresponds to the number of wedge gears (41).