Abstract
A disc brake includes a pressure piece, an adjusting spindle, and an adjustment unit. The adjusting spindle is guided through an opening, provided with a thread unit, of the pressure piece. The adjusting spindle is guided through the adjusting unit, and the adjusting unit protrudes into the opening. The adjusting spindle has a limitation disposed in a thread turn of the adjusting spindle.
Claims
1. A disc brake (1) for motor vehicles, the disc brake comprising: a pressure piece (2) which is arranged along an axial axis (AB) of the disc brake (1), at least one adjusting spindle (10) having a thread (15), wherein the thread (15) has at least one thread turn (11), and an adjustment unit (20) for adjusting an air gap (L) of the disc brake (1), wherein the adjusting spindle (10) is guided axially at least partially through an opening (4), which is provided with a thread unit (5), of the pressure piece (2), and wherein the adjusting spindle (10) is guided at least partially through the adjustment unit (20) and the adjustment unit (20) axially protrudes at least partially into the opening (4) of the pressure piece (2), wherein the adjusting spindle (10) includes a limitation (12, 12a, 12b, 12c) disposed in the thread turn (11).
2. The disc brake (1) as claimed in claim 1, wherein the limitation (12, 12a, 12b, 12c), starting from a thread base (13) of the thread turn (11) of the adjusting spindle (10), extends radially toward the adjustment unit (20).
3. The disc brake (1) as claimed in claim 1, wherein the limitation (12, 12a, 12b, 12c) is a part-region (14a) of a thread flank (14) of the adjusting spindle (10) or the limitation (12, 12a, 12b, 12c) is a part-region (14b) of the spindle (10).
4. The disc brake (1) as claimed in claim 1, wherein the limitation (12, 12a, 12b, 12c) is formed by machining, shaping, or material application production.
5. The disc brake (1) as claimed in claim 4, wherein the limitation (12, 12a, 12b, 12c) is formed by shaping and the shaping is a rolling process.
6. The disc brake (1) as claimed in claim 3, wherein the limitation (12, 12b, 12c) which is in the form of part of the thread flank (14) is deformed by a shaping operation.
7. The disc brake (1) as claimed in claim 2, wherein the thread unit (5) includes a stop (5a) that defines a radial spacing (S) from the axial axis (A), wherein the limitation (12, 12a, 12b, 12c) has a radial dimension from the axial axis (A) which is greater than the radial spacing (S) of the stop (5a) of the thread unit (5), such that the stop (5a) and the limitation overlap radially.
8. The disc brake (1) as claimed in claim 1, wherein the limitation (12, 12a, 12b, 12c) is configured to strike a stop (5a) of the thread unit (5) and to prevent the adjusting spindle (10) from being axially unscrewed toward a brake disc of the disc brake (1).
Description
BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Selected embodiments of the invention will be explained below with reference to the appended Figures, in which
[0019] FIG. 1 shows a disc brake having an adjusting spindle,
[0020] FIG. 2 is a laterally sectioned view of a tensioning unit of a disc brake according to FIG. 1,
[0021] FIG. 3 is a cut-out of the adjusting spindle according to FIG. 2 with a limitation formed by a shaping process,
[0022] FIG. 3a is a perspective view of an adjusting spindle of a tensioning unit according to FIGS. 2 and 3,
[0023] FIG. 4 is a partial perspective view of the adjusting spindle according to FIG. 2 with a limitation produced using a machining operation,
[0024] FIG. 5 is a partial perspective view of the adjusting spindle according to FIG. 2 with a limitation which is produced by means of rolling, and
[0025] FIG. 6 is a partial perspective view of an adjusting spindle having a limitation produced by adhesive bonding.
DETAILED DESCRIPTION OF THE DRAWINGS
[0026] FIG. 1 is a perspective view of a disc brake 1 having an adjusting spindle 10. The disc brake 1 has a brake caliper 6 which is supported by guiding pins 8, 8a in a sliding manner on a brake carrier 7. The adjusting spindle 10 is arranged, as part of a tensioning unit 17 centrally along an axial axis AB of the disc brake 1, in the brake caliper 6. The tensioning unit 17 further includes a rotary lever 18 which is supported on an inner wall 6a of the brake caliper 6. The rotary lever 18 axially tensions a brake disc 19 along the axial axis AB of the disc brake 1 via a pressure piece 2 and via two brake liners 3, 3a. In order to adjust an air gap L, an adjustment unit 20 is additionally arranged on the adjusting spindle 10. The correction of the air gap L is carried out where necessary during the feed movement of the rotary lever 18 or more specifically during the bridging of the air gap L. During the feeding operation, a pressure plate 10a which is axially arranged on the adjusting spindle 10 presses against the brake liner 3a, wherein the brake liner 3a is displaced in the direction of the brake disc 19. With an increasing brake liner wear, the adjusting spindle is moved in order to adjust the air gap L further in the direction of the brake disc 19.
[0027] The maximum position, that is to say, the limit state of the adjusting spindle 10 according to FIG. 1, is illustrated in FIG. 2. The limit state is intended to be understood to be the state of the adjusting spindle 10 in which the adjusting spindle 10 can still be adjusted by the adjustment unit 20. Further unscrewing of the adjusting spindle 10 from the pressure piece 2 and the adjustment unit 20 which is arranged on the adjusting spindle 10 results in the adjusting spindle 10 no longer being able to be adjusted via the adjustment unit 20 and the adjustment unit 20 not remaining in position, or where applicable becoming jammed, whereby the adjustment unit 20 loses its adjustment function. The adjustment unit 20 has resilient elements 21 and guiding bushes 22, wherein the adjusting spindle 10 is connected to the adjustment unit 20 by a wrap spring 21a. The wrap spring 21a is a component of the adjustment unit 20. Both the adjusting spindle 10 and the adjustment unit 20 are supported, axially along the axis A of the adjusting spindle 10, partially in the pressure piece 2. More specifically, the adjustment unit 20 is supported on the adjusting spindle 10.
[0028] FIG. 3 shows an adjusting spindle 10 according to FIG. 1 and FIG. 2 and including a limitation 12 according to the present disclosure. The limitation 12 of FIG. 3 is constructed as a shaped limitation 12 and prevents further unscrewing of the adjusting spindle 10 from the adjustment unit 20 (see FIG. 1 and FIG. 2) by blocking stop 5a, which is in the form of a tooth flank 5a, of the thread unit 5. In order to form the limitation 12, a cut-out of the thread flank 14 is shaped using a pressing tool. When viewed from a thread base 13 of the thread 15, the pitch angle of the shaped thread flank 14a has been changed in comparison with the original pitch angle. A part-region of the shaped thread turn tip 11a thus partially spans the region 13a of the thread base 13 which is arranged between the thread flank 14a and the thread flank 14. The limitation 12 has, with regard to the radial form, a dimension which is greater than the spacing S of a schematically illustrated stop 5a (FIG. 2) of the thread unit 5 with respect to an axial axis A of the adjusting spindle.
[0029] FIG. 3a is a perspective view of the adjusting spindle according to FIG. 1, FIG. 2 and FIG. 3 with the shaped limitation 12. An active diameter 24 of the shaping tool can be clearly seen.
[0030] Another embodiment of the limitation 12 can be seen in FIG. 4. FIG. 4 is a partial perspective view of the adjusting spindle 10 according to FIG. 1 and FIG. 2 with a limitation 12a which is produced by machining. The limitation 12a is formed in an end region 23 of the adjusting spindle 10. The end region 23 is the region of the adjusting spindle 10 opposite the pressure plate 10a (FIG. 1). The thread 15 is cut into the adjusting spindle 10, wherein the limitation 12a is a non-processed portion of the thread 15. The thread turn 11 is thus not formed in the region of the limitation 12a.
[0031] FIG. 5 is a partial perspective view of the adjusting spindle according to FIG. 1 and FIG. 2 with a limitation 12b which is produced by rolling. The limitation 12b is fitted during the production of the adjusting spindle 10 at any position along the spindle axis in a thread turn 11.
[0032] FIG. 6 is a perspective view of the adjusting spindle according to FIG. 1 and FIG. 2 with a limitation 12c produced by means of adhesive, soldering, or welding material. The radial form of the limitation 12 can be clearly seen.
[0033] While the above description constitutes the preferred embodiments of the present invention, it will be appreciated that the invention is susceptible to modification, variation and change without departing from the proper scope and fair meaning of the accompanying claims.
