BRAKE DEVICE

Abstract

The invention relates to a brake device having a frame, at least one pair of mutually opposing braking elements, at least one actuation element in operative connection with each braking element, and a spring device, wherein each braking element has three joint sections which are arranged in a row and are connected to one another via flexure bearings, and the middle joint section of which has a contact section, and the two joint sections adjoining the middle joint section are each connected integrally to the frame via a flexure bearing, wherein a force is exerted on each braking element by means of the spring device, by means of which force the respective contact section can be pressed with a defined force against an element to be braked, and a force which counteracts the force exerted on the braking elements by the spring device acts on the braking elements by means of a continuous energy input into the actuation elements and, when the energy input into the actuation elements is absent, the force exerted by the latter on the braking elements is removed.

Claims

1. A brake device comprising: a frame; at least one pair of mutually opposing braking elements; at least one actuation element in operative connection with each braking element; and a spring device; wherein each braking element has three joint sections which are arranged in a row and are connected to one another via flexure bearings, and the middle joint section which has a contact section; wherein two joint sections of the three joint sections adjoining the middle joint section are each connected integrally to the frame via a flexure bearing; wherein the spring device is positioned to exert a first force on each braking element so that the respective contact section can be pressed with a defined force against an element to be braked situated between the braking elements; wherein the brake device is designed such that a continuous energy input into the actuation elements can generate a second force on the braking elements which counteracts the first force exerted on the braking elements by the spring device; and wherein, when the continuous energy input into the actuation elements is absent, the second force exerted by the actuation elements on the braking elements is removed.

2. The brake device according to claim 1, each actuation element is a piezoelectric actuator in which a change in length can be brought about by an electrical energy input.

3. The brake device according to claim 1, further comprising: a lever transmission device.

4. The brake device according to claim 1, wherein the spring device comprises at least one disc spring, a tension spring or at least one tension spring section.

5. The brake device according to claim 4, wherein a direction of the first force of the disc spring, the tension spring, or the tension spring section is substantially perpendicular to a braking element of the at least one pair of mutually opposing braking elements or substantially parallel to the braking element.

6. The brake device according to claim 1, wherein both of the braking elements have an elongated shape; and wherein the actuation elements are arranged substantially parallel to a longitudinal extension of a braking element of the at least one pair of mutually opposing braking elements.

7. The brake device according to claim 1, wherein the spring device has a plurality of tension springs which are each arranged substantially parallel to the actuation element.

8. The brake device according to claim 1, wherein the spring device comprises two spring elements connected to the braking element and each of the spring elements has two tension spring sections arranged parallel to one another, wherein each tension spring section is arranged substantially perpendicular to a braking element of the at least one pair of mutually opposing braking elements.

9. A drive unit comprising: a drive element to be braked and a brake device for cooperating with the drive element; and wherein the brake device comprises: a frame; at least one pair of mutually opposing braking elements; at least one actuation element in operative connection with each braking element and a spring device; wherein each braking element has three joint sections which are arranged in a row and are connected to one another via flexure bearings, and the middle joint section which has a contact section; wherein two joint sections of the three joint sections adjoining the middle joint section are each connected integrally to the frame via a flexure bearing; wherein the spring device is positioned to exert a first force on each braking element so that the respective contact section can be pressed with a defined force against an element to be braked situated between the braking elements; wherein the brake device is designed such that a continuous energy input into the actuation elements can generate a second force on the braking elements which counteracts the first force exerted on the braking elements by the spring device; and wherein, when the continuous energy input into the actuation elements is absent, the second force exerted by the actuation elements on the braking elements is removed.

10. A positioning device comprising: at least one drive unit comprising: a drive element to be braked and a brake device for cooperating with the drive element; and wherein the brake device comprises: a frame; at least one pair of mutually opposing braking elements; at least one actuation element in operative connection with each braking element; and a spring device; wherein each braking element has three joint sections which are arranged in a row and are connected to one another via flexure bearings, and the middle joint section which has a contact section; wherein two joint sections of the three joint sections adjoining the middle joint section are each connected integrally to the frame via a flexure bearing; wherein the spring device is positioned to exert a first force on each braking element so that the respective contact section can be pressed with a defined force against an element to be braked situated between the braking elements; wherein the brake device is designed such that a continuous energy input into the actuation elements can generate a second force on the braking elements which counteracts the first force exerted on the braking elements by the spring device; and wherein, when the continuous energy input into the actuation elements is absent, the second force exerted by the actuation elements on the braking elements is removed.

Description

[0020] Advantages and expediencies of the invention are described in more detail in the following description of preferred exemplary embodiments using the figures. In the figures:

[0021] FIG. 1: shows a perspective view of an embodiment of the brake device according to the invention

[0022] FIG. 2: shows a plan view of the brake device according to FIG. 1

[0023] FIG. 3: shows a sectional view of the brake device according to FIG. 1 along the cut according to FIG. 2

[0024] FIG. 4: shows a perspective view of a further embodiment of the brake device according to the invention

[0025] FIG. 5: shows a plan view of the brake device according to FIG. 4

[0026] FIG. 6: shows a sectional view of the brake device according to FIG. 4 along the cut according to FIG. 5

[0027] FIG. 7: shows a perspective view of a further embodiment of the brake device according to the invention

[0028] FIG. 8: shows a plan view of the brake device according to FIG. 7

[0029] FIG. 9: shows a sectional view of the brake device according to FIG. 7 along the cut according to FIG. 8

[0030] FIG. 1 shows a perspective view of a first embodiment of the brake device (1) according to the invention. This brake device has two braking elements (3) arranged mutually opposing one another, wherein both of the braking elements (3) are connected in one piece to the frame (2) via two flexure bearings (6) arranged at different ends.

[0031] Each braking element (3) has an elongated shape and comprises three joint sections (34) arranged in a row or one behind the other, wherein adjacent joint sections (34) are each connected to one another via a flexure bearing (33). The respective middle joint section has a contact section (31) provided for contact with an element to be braked. The contact section (31) of both braking elements (3) point in directions towards one another.

[0032] A total of four actuation elements (4) in the form of piezoelectric actuators are inserted into the frame (2). Two of the actuation elements (4) are arranged directly next to one another and parallel to one another and act on the respective end section of the frame (2). Due to a change in length of the actuator elements (4) brought about by continuous energy input, a displacement of one element of the frame relative to the other element of the frame (2) (in FIG. 1 the right part of the frame 2), which is intended for attachment to a higher-level unit, occurs. Due to the connection on both sides of the braking element (3) to the frame (2) or the elements of the frame via flexure bearings (6), a desired movement of the braking element (3) occurs, in which the joint section (34) with the contact section (31) moves towards the adjacent and associated actuation elements 4. The mutually opposed braking element (3) makes an analogous movement, such that with continuous energy input into the actuation elements (4) and the accompanying change in length of the actuation elements (4), the joint sections (34) with the contact section (31) move away from one another in opposite directions.

[0033] Each actuation element (4) is in contact with a screw (100) associated thereto, which is inserted into a corresponding tapped hole in the frame (2), wherein, by means of the respective screw (100), the actuating element (4) in contact therewith can be subjected to a compressive force or pretensioning.

[0034] The spring device (5) is located on the left-hand element of the frame (2) in FIG. 1, which comprises a tensioning element (54) and a set of disc springs (55). The tensioning element (54) also has a journal (56) (not visible in FIG. 1) and a collar section (57) having two through holes (58). The journal (56) protrudes into a correspondingly shaped recess in the frame (2), while the disc springs (55) arranged around the journal (56) are supported, on the one hand, on the frame (2) and, on the other, on a shoulder section of the tensioning element (54). By means of screws (not shown in FIG. 1), which protrude through the through holes (58) of the collar section (57) of the tensioning element (54), the tensioning element (54) is connected to a sleeve (103) (also not shown in FIG. 1), and this connection simultaneously compresses the disc springs (55), resulting in a force with which the two elements of the frame (2) can be moved towards one another in one direction. Thus, the force exerted by the spring device (5) on the elements of the frame (2) counteracts the force on the elements of the frame (2) caused by the actuation elements due to a change in length. The direction of the force of the spring device (5) is thus substantially parallel to the orientation of the elongated braking element (3).

[0035] FIG. 2 shows a plan view of the brake device according to FIG. 1. FIG. 2 also indicates a cut along the cut line A-A, wherein the corresponding sectional view is shown in FIG. 3.

[0036] FIG. 3 shows the spring device (5) with the tensioning element (54), the journal (56) of which cooperates with a corresponding recess (102) in the frame (2) or in the left-hand element of the frame (2) in FIG. 3, wherein the set of a plurality of disc springs (55) is arranged, around the journal (56) of the tensioning element (54), which disc spring set is supported against the shoulder section of the tensioning element (54). Via the collar section (57) of the tensioning element (54), which has two through holes (58), the tensioning element (54) is connected to the sleeve (103) of the brake device (1) by means of screws (not shown in FIG. 3), which project through the through holes of the collar section (57), wherein the disc springs (55) are compressed by this connection in order to thereby press the element of the frame (2) which is on the left in FIG. 3 towards the element of the frame (2) which is on the right in FIG. 3.

[0037] FIG. 4 shows a further embodiment of a brake device 1 according to the invention, which is similar to the embodiment according to FIGS. 1 to 3. It differs substantially therefrom in that the spring device (5) is constructed differently and is also arranged in a different place. The spring device (5) comprises in total four tension springs (51) in the form of flat spring steel sheets, which are each arranged next to an actuation element (4) and aligned parallel thereto. The direction of the force of the spring device (5) or the tension springs (51) is thus substantially parallel to the orientation of the elongated braking element (3).

[0038] FIG. 5 shows the brake device (1) according to FIG. 4 in a plan view, while FIG. 6 corresponds to a sectional view along the cut A-A indicated in FIG. 5.

[0039] With the brake device (1) according to FIG. 7, which is also similar to the brake device according to FIGS. 1 to 3 or to the brake device according to FIGS. 4 to 6, the spring device (5) is formed by two substantially annular spring elements (52), each of which has two tension spring sections (53). Each of the spring elements (52) is connected to the joint sections (34) of both braking elements (3), the joints having the contact section (31). The direction of the force of the spring device (5) is thus substantially perpendicular to the orientation of the elongated braking element (3).

[0040] FIG. 8 shows the brake device according to FIG. 7 in a plan view and also indicates a cut along the cut line A-A, wherein the corresponding sectional view is shown in FIG. 9.

LIST OF REFERENCE NUMERALS

[0041] 1 Brake device [0042] 2 Frame [0043] 3 Braking element [0044] 31 Contact section (of the braking element 3) [0045] 33 Flexure bearing (of the braking element 3) [0046] 34 Joint sections (of the braking element 3) [0047] 4 Actuation element [0048] 5 Spring device [0049] 51 Tension spring (of the spring device 5) [0050] 52 Spring element (of the spring device 5) [0051] 53 Tension spring section (of the spring element 52) [0052] 54 Tensioning element (of the spring device 5) [0053] 55 Disc spring (of the spring device 5) [0054] 56 Journal (of the tensioning element 54) [0055] 57 Collar section (of the tensioning element 54) [0056] 58 Through holes (of the collar section 57) [0057] 6 Flexure bearing [0058] 100 Screw [0059] 101 Tapped bore [0060] 102 Recess (of the frame 2) [0061] 103 Sleeve (of the brake device 1)