Abstract
An actuating device may include an energy recovery unit for a mechanical brake system. The actuating device may have an actuating drive for a brake application movement of a brake part for a service brake function. The actuating device has a force cartridge with a prestressed spring and with a ramp bearing as the energy recovery unit The ramp bearing may be fastened to the actuating drive on one side and to the spring on the other side. The force cartridge is fitted on a line of force action of the actuating drive and interacts with the actuating drive such that a force component for assisting the actuating drive is provided in a manner dependent on an adjustment position of the actuating drive.
Claims
1.-10. (canceled)
11. An actuating device comprising: an energy recovery unit for a mechanical brake system; an actuating drive for a brake application movement of a brake part for a service brake function; and a force cartridge with a prestressed spring and with a ramp bearing as the energy recovery unit, wherein the ramp bearing is fastened to the actuating drive on a first side and to the prestressed spring on a second side, wherein the force cartridge is fitted on a line of force action of the actuating drive and is configured to interact with the actuating drive such that a force component for assisting the actuating drive is provided based on an adjustment position of the actuating drive.
12. The actuating device of claim 11 wherein the ramp bearing has a cam track with a linear region.
13. The actuating device of claim 11 wherein the ramp bearing has a cam track with a non-linear region.
14. The actuating device of claim 11 wherein the ramp bearing has a cam track with a linear region and with a non-linear region.
15. The actuating device of claim 11 wherein the ramp bearing is a first ramp bearing, the actuating device comprising a second ramp bearing for the brake application movement, wherein the second ramp bearing includes a cam track with a linear region.
16. The actuating device of claim 11 wherein the ramp bearing is a first ramp bearing, the actuating device comprising a second ramp bearing for the brake application movement, wherein the second ramp bearing includes a cam track with a non-linear region.
17. The actuating device of claim 11 wherein the ramp bearing is a first ramp bearing, the actuating device comprising a second ramp bearing for the brake application movement, wherein the second ramp bearing includes a cam track with a linear region and with a non-linear region.
18. The actuating device of claim 17 wherein the ramp bearing is a first ramp bearing, the actuating device comprising a second ramp bearing for the brake application movement, wherein the second ramp bearing includes a cam track with a linear region and/or a non-linear region, wherein the second ramp bearing has a first region with a steep gradient for overcoming an air gap and a second region with a shallow gradient for generating brake application forces.
19. The actuating device of claim 17 wherein the cam track of the second ramp bearing is coordinated with a cam track of the first ramp bearing such that a bistable or unstable situation for the brake application device is achievable over certain angles of rotation of the actuating device.
20. The actuating device of claim 17 wherein the first ramp bearing includes a first region and a second region that correspond with the second ramp bearing over an angle of rotation.
21. The actuating device of claim 20 wherein the first region has a zero gradient for a neutral behavior while overcoming an air gap, wherein the second region has a non-linear characteristic that is coordinated such that a bistable situation can be generated over an entire range of a braking intervention.
22. The actuating device of claim 11 wherein the actuating drive is a first actuating drive, the actuating device comprising a second actuating drive, wherein the first and second actuating drives are configured to perform a brake application movement jointly.
23. The actuating device of claim 11 wherein the actuating drive is a first actuating drive, the actuating device comprising a second actuating drive, wherein the first and second actuating drives are configured to perform brake application movements independently of one another.
24. The actuating device of claim 11 wherein the ramp bearing has a detent position that forms a detent position for a parking brake function.
25. The actuating device of claim 24 wherein the detent position is an indentation or a depression.
26. The actuating device of claim 11 wherein the prestressed spring is fastened by a first end to the ramp bearing and by a second end, opposite the first end, to a brake caliper.
Description
IN THE DRAWINGS
[0025] FIG. 1 shows a perspective view of a mechanical brake system with an actuating device according to an exemplary embodiment according to the invention;
[0026] FIG. 2 shows a cross-sectional view of the mechanical brake system from FIG. 1;
[0027] FIG. 3 shows an exploded illustration of the mechanical brake system from FIG. 1;
[0028] FIG. 4 shows a schematic cross-sectional view of an actuating device according to the invention in an initial situation;
[0029] FIG. 5 shows a schematic cross-sectional view of the actuating device according to the invention according to FIG. 4 during a service braking operation;
[0030] FIG. 6 shows a schematic cross-sectional view of an actuating device according to the invention according to FIG. 5 during a wear-compensating readjustment.
[0031] FIG. 1 shows a perspective view of a mechanical brake system with an actuating device according to an exemplary embodiment according to the invention. Braking is performed by means of the brake application movement and pressing of a brake lining 2 against a brake disk 1. The brake lining 2 is in this case part of a brake shoe. An actuating device is used for the brake application movement of the brake lining 2. The actuating device has an axially displaceable actuating bolt 7, a spiral spring 8 as an energy store, a first gearbox 4 for a first actuating motor 3, a second gearbox 6 for a second actuating motor 5, and a mounting plate 9 as an axial bearing and connection to a brake caliper (not shown in full). The brake caliper has the brake lining 2 as a brake part and the actuating device, wherein the actuating device is in particular arranged in a housing. The brake caliper is arranged on or around the brake disk 1.
[0032] FIG. 2 shows a cross-sectional view of the mechanical brake system from FIG. 1, wherein the cross-sectional plane A-A is indicated in FIG. 1. Additional details are illustrated here. The brake lining 2 can be caused to perform a plane-parallel brake application movement toward the brake disk 1. The brake application movement is performed in particular by way of the axial displacement of an actuating nut 10 on which an annular part of the ramp bearing 16 as brake application means is arranged fixedly in terms of rotation. The ramp bearing 16 has spherical rolling elements and, on its other or opposite side, is fastened fixedly in terms of rotation to the actuating bolt 7. This means that a rotation of the actuating nut 10 during the axial displacement thereof is not transmitted to the actuating bolt 7. The actuating nut 10 is in operative engagement both with an actuating spindle 20 and with an actuating sleeve 11 and can be moved (or also blocked—parking function) by means of one or both of these components 20, 11. The actuating spindle 20 has a spindle-like external thread which is in operative engagement with an internal thread of the actuating nut 10. In this way, a rotation of the actuating spindle 20 can be transformed into an axial movement of the actuating nut 10. The actuating sleeve 11 has, on its inner circumference, multiple rectilinear grooves which are arranged parallel to the axis and which are in operative engagement with the inversely identically formed external grooves of the actuating nut 10, Here, a rotation of the actuating sleeve 11 can lead to an axial movement of the actuating nut 10. The actuating sleeve 11 is fastened to a toothed gear 12 which can be driven and set in rotation via a drive pinion 13 of the actuating motor 3. The gearbox 4 described in FIG. 1 (also referred to as gearbox A) is formed by the toothed gear 12 and the drive pinion 13. A first, lower annular component of the ramp bearing 17 of the energy recovery unit is fastened to the upper side of the toothed gear 12. The second, upper annular component of the ramp bearing 17 is mounted on the first component by means of spherical rolling elements. The second annular component is pressed onto the rolling elements, and thus onto the first component, by means of a prestressed spiral spring 8 as an energy store. The second component of the ramp bearing 17 is fixedly connected only to the spiral spring 8, or is in operative engagement with the spiral spring 8 and the rolling elements, in order that, inter glia, the actuating sleeve 11 can rotate independently of this component. The toothed gear A 12 is mounted rotatably on a toothed gear B 19 by means of an axial bearing or needle roller bearing 14, wherein the needle roller bearing 14 is arranged on the upper side of the toothed gear B 19 and fastened thereto. The gearbox 6 described in FIG. 1 (also referred to as gearbox B) is formed by the toothed gear 19 and the drive pinion 18. The toothed gear 19 is fixedly connected to the actuating spindle 20 and sets this in rotation by means of the actuating motor 5. The toothed gear B 19 is connected rotatably to the mounting plate 9 by means of an axial bearing or ball bearing 15. The mounting plate 9 serves as a mount for the ball bearing 15 and is fixedly connected to the brake caliper (not illustrated). All components of the actuating device are arranged coaxially around the axis of rotation of the spindle 20.
[0033] FIG. 3 shows an exploded illustration of the mechanical brake system from FIG. 1 or FIG. 2. In addition to the elements or components described above, a first sliding sleeve 23 and a second sliding sleeve 24 are illustrated in detail. The first sliding sleeve 23 is arranged between the actuating spindle 20 and the actuating sleeve 11 and, as a sliding contact/surface, allows a rotatable mounting of spindle 20 and actuating sleeve 11. The second sliding sleeve 24 is arranged between the actuating spindle 20 and the actuating bolt 7 and, as a sliding contact/surface, allows a rotatable mounting of the spindle 20 relative to the actuating bolt 7. The sliding sleeves 23, 24 serve in particular for position stabilization, and stabilization against tilting, of the components that are in contact with the sliding sleeves. The ramp bearing 17 is formed by an upper annular component with three arcuate depressions, three spherical rolling elements arranged in the depressions and by a lower annular component (in particular as an insert in the toothed gear 12) with an annular depression (not visible). The upper component of the ramp bearing 17 also has an anti-rotation device 21 and, on the upper side, a bearing surface 22 for the spring 8. The anti-rotation device 21 is fastened, for example, to an axially extending rod or rail (not illustrated) such that the upper part of the ramp bearing 17 is axially displaceable and the force of the spring 8 can be transmitted to the rolling elements, via the toothed gear 12 and finally to the actuating sleeve 11. Similarly to the ramp bearing 17 of the energy recovery unit, the ramp bearing 16 of the brake application means has an upper annular component with three arcuate depressions, three spherical rolling elements arranged in the depressions, and a lower annular component with an annular depression (not visible). The upper component and the lower component of the ramp bearing 16 are connected fixedly in terms of rotation to the actuating bolt 7 and to the actuating nut 10 in each case by means of three pins.
[0034] FIGS. 4, 5 and 6 each show a schematic cross-sectional view of an actuating device according to the invention; firstly in an initial position, then during a service braking operation, and finally during a wear-compensating readjustment. The cross-sectional view illustrates in particular the forces acting on the components of the actuating device and their directions of force with respect to one another. The components have already been described in FIGS. 1 to 3. It is possible to clearly see the function of the actuating nut 10, which can be moved both by the actuation of the actuating drive A with the actuating sleeve 11 (based on the actuating motor A 3) and by the actuation of the actuating drive B with the actuating spindle 20 (based on the actuating motor B 4). The actuating bolt 7 is displaced, and the brake application movement of the brake lining 2 is effected, by means of the movement of the actuating nut 10, for example by horizontal displacement by means of the actuating drive B (see FIG. 5) or by vertical displacement by means of the actuating drive A (see FIG. 6). During the service braking operation in FIG. 5, the force of the force cartridge with the prestressed spring 8 and the ramp bearing 17 assists the actuating drive B. The cross-sectional views illustrate the two brake linings 2, which are arranged in the brake caliper 25 and which are displaced, or caused to perform a brake application movement, by means of the actuating device.
LIST OF REFERENCE DESIGNATIONS
[0035] 1 Brake disk
[0036] 2 Brake shoe with brake linina
[0037] 3 Actuating motor A
[0038] 4 Gearbox A
[0039] 5 Actuating motor B
[0040] 6 Gearbox B
[0041] 7 Actuating bolt
[0042] 8 Spring as energy store
[0043] 9 Axial bearing mounting plate/connection to the brake caliper
[0044] 10 Actuating nut
[0045] 11 Actuating sleeve
[0046] 12 Toothed gear A
[0047] 13 Drive pinion A
[0048] 14 Axial bearing/needle roller bearing
[0049] 15 Axial bearing/ball bearing
[0050] 16 Ramp bearing (brake application movement)
[0051] 17 Ramp bearing (energy recovery unit)
[0052] 18 Toothed gear B
[0053] 19 Drive pinion B
[0054] 20 Actuating spindle
[0055] Anti-rotation device for cam ramp bearing
[0056] Bearing surface for spring/energy store
[0057] Sliding sleeve for actuating spindle-actuating bolt sliding contact
[0058] Sliding sleeve for actuating spindle-actuating sleeve sliding contact
[0059] Brake caliper
