BRAKE CALIPER GUIDE

Abstract

The disclosure relates to a brake caliper guide for a floating caliper disk brake, comprising at least one guide pin attached to a brake caliper, having a head and a shaft, a brake carrier having at least one guide bore which has an entry region and a bore depth extending into the brake carrier, and a guide device inserted into the entry region of the guide bore having a sliding sleeve arranged in an elastomer sleeve 40. The shaft of the guide pin is mounted in a longitudinally displaceable manner in the sliding sleeve such that the head is located outside the brake carrier. The region of the shaft which is located on the side of the guide device oriented toward the bore depth projects into the guide bore. The end face of the sliding sleeve which is oriented toward the outer face of the brake carrier has a first collar which extends radially outwardly. The elastomer sleeve overlaps the sliding sleeve and adjoins the first collar and is delimited in the longitudinal extent thereof by this collar, and/or the end face of the sliding sleeve, which is oriented toward the outer face of the brake carrier, has a first collar which extends radially outwardly. The end face of the sliding sleeve has a second collar which extends radially outwardly. The elastomer sleeve is arranged between the first and the second collar and is delimited in the longitudinal extent thereof by the collars.

Claims

1. A brake caliper guide for a floating caliper disk brake, comprising: at least one guide pin attached to a brake caliper, having a head and a shaft, a brake carrier having at least one guide bore which has an entry region and a bore depth extending into the brake carrier, and a guide device inserted into the entry region of the guide bore having a sliding sleeve arranged in an elastomer sleeve, wherein the shaft of the guide pin is mounted in a longitudinally displaceable manner in the sliding sleeve in such a way that the head is located outside the brake carrier, and a region of the shaft which is located on a side of the guide device oriented toward the bore depth projects into the guide bore, wherein an end face of the sliding sleeve which is oriented toward an outer face of the brake carrier has a first collar which extends radially outwardly, wherein the elastomer sleeve overlaps the sliding sleeve and adjoins the first collar and is delimited in a longitudinal extent thereof by this collar, and/or wherein the end face of the sliding sleeve, which is oriented toward the outer face of the brake carrier, has a first collar which extends radially outwardly, and wherein an end face of the sliding sleeve, which is oriented toward the bore depth of the guide bore, has a second collar which extends radially outwardly, wherein the elastomer sleeve is arranged between the first and the second collar and is delimited in the longitudinal extent thereof by the collars.

2. The brake caliper guide according to claim 1, wherein the guide device comprises a sealing arrangement having a guide pin connection and/or a brake caliper connection, a brake carrier connection and a protective bellows, which is integrally connected to the elastomer sleeve and, like the elastomer sleeve, includes an elastomer material, wherein, in a transition region between the elastomer sleeve and the brake carrier connection and/or the protective bellows, a width of the elastomer sleeve protrudes out of the entry region of the guide bore and/or out of the brake carrier.

3. The brake caliper guide according to claim 1, wherein the entry region has a cylindrical inner surface having an inside diameter which forms a receiving portion for a cylindrical outer surface of the elastomer sleeve and is in contact with the cylindrical outer surface of the elastomer sleeve, wherein the sliding sleeve has an inner sliding side in sliding contact with the shaft and an outer receiving side having an outer surface which is cylindrical at least in part and has an outside diameter, which forms a receiving portion for a cylindrical inner surface of the elastomer sleeve and is in contact with the cylindrical inner surface of the elastomer sleeve, wherein the radial distance between the inner diameter and the outer diameter defines a thickness of a part of the elastomer sleeve which is located between the cylindrical inner surface and the cylindrical outer surface when installed, wherein a transition region extends at an angle with respect to the elastomer sleeve, wherein a dimension of the collar height of the first collar in a radial direction, starting from the cylindrical outer surface, is at least equal to the dimension of the thickness.

4. The brake caliper guide (1) according to claim 3, wherein the inner sliding side has at least one connecting piece protruding out of the sliding sleeve, wherein the at least one connecting piece is in sliding contact with the shaft.

5. The brake caliper guide according to claim 1, wherein the sliding sleeve has a slot oriented in an axial direction of the sleeve.

6. The brake caliper guide according to claim 1, wherein both the shaft and the sliding sleeve are made of metal or comprise metal, and therefore there is a metal-on-metal sliding pair.

7. The brake caliper guide according to claim 1, wherein the guide device encapsulates a bearing point which is formed by the sliding sleeve, and/or the bore depth extending into the brake carrier.

8. The brake caliper guide according to claim 1, wherein the region of the shaft which is located on the side of the guide device oriented toward the bore depth and projects into the guide bore, comprises at least one guide arrangement by which the guide pin is mounted in a longitudinally displaceable manner in a region of the bore depth extending into the brake carrier.

9. The brake caliper guide according to claim 1, wherein the shaft is at least twice a length of the sliding sleeve.

10. The brake caliper guide according to claim 1, wherein, with regard to the components and construction elements indicated in the claims and the respective arrangement and assignment thereof in the brake caliper guide (1), the brake caliper (2) replaces the brake carrier (3), and the brake carrier (3) replaces the brake caliper (2).

11. The brake caliper guide according to claim 1, wherein the entry region has a cylindrical inner surface having an inside diameter which forms a receiving portion for a cylindrical outer surface of the elastomer sleeve and is in contact with the cylindrical outer surface of the elastomer sleeve, wherein the sliding sleeve has an inner sliding side in sliding contact with the shaft and an outer receiving side having an outer surface which is cylindrical at least in part and has an outside diameter, which forms a receiving portion for a cylindrical inner surface of the elastomer sleeve and is in contact with the cylindrical inner surface of the elastomer sleeve, wherein the radial distance between the inner diameter and the outer diameter defines a thickness of a part of the elastomer sleeve which is located between the cylindrical inner surface and the cylindrical outer surface when installed, wherein a transition region extends at an angle with respect to the elastomer sleeve, wherein a dimension of the collar height-of the first collar in a radial direction, starting from the cylindrical outer surface, is greater than this dimension.

12. The brake caliper guide according to claim 1, wherein the entry region has a cylindrical inner surface having an inside diameter which forms a receiving portion for a cylindrical outer surface of the elastomer sleeve and is in contact with the cylindrical outer surface of the elastomer sleeve, wherein the sliding sleeve has an inner sliding side in sliding contact with the shaft and an outer receiving side having an outer surface which is cylindrical at least in part and has an outside diameter, which forms a receiving portion for a cylindrical inner surface of the elastomer sleeve and is in contact with the cylindrical inner surface of the elastomer sleeve, wherein the radial distance between the inner diameter and the outer diameter defines a thickness of a part of the elastomer sleeve which is located between the cylindrical inner surface and the cylindrical outer surface when installed, wherein a transition region extends at an angle with respect to the elastomer sleeve, and wherein the dimension of the collar height is at least great enough that this collar axially supports the angled transition region.

13. The brake caliper guide according to claim 1, wherein the entry region has a cylindrical inner surface having an inside diameter which forms a receiving portion for a cylindrical outer surface of the elastomer sleeve and is in contact with the cylindrical outer surface of the elastomer sleeve, wherein the sliding sleeve has an inner sliding side in sliding contact with the shaft and an outer receiving side having an outer surface which is cylindrical at least in part and has an outside diameter, which forms a receiving portion for a cylindrical inner surface of the elastomer sleeve and is in contact with the cylindrical inner surface of the elastomer sleeve, wherein the radial distance between the inner diameter and the outer diameter defines a thickness of a part of the elastomer sleeve which is located between the cylindrical inner surface and the cylindrical outer surface when installed, wherein a transition region extends at an angle with respect to the elastomer sleeve, and wherein the dimension of the collar height of the second sliding sleeve collar in the radial direction, starting from the cylindrical outer surface, is at least half the size of the dimension of the thickness.

14. The brake caliper guide according to claim 13, wherein the inner sliding side has at least one connecting piece protruding out of the sliding sleeve, wherein the at least one connecting piece is in sliding contact with the shaft.

15. The brake caliper guide according to claim 14, wherein the at least one sliding connecting piece is in the form of a radially circumferential connecting piece.

16. The brake caliper guide according to claim 13, wherein the sliding sleeve has a slot oriented in an axial direction of the sleeve.

17. The brake caliper guide according to claim 1, wherein the guide device encapsulates a bearing point which is formed by the sliding sleeve and/or the bore depth extending into the brake carrier and is lubricated.

18. The brake caliper guide according to claim 13, wherein the region of the shaft which is located on the side of the guide device oriented toward the bore depth and projects into the guide bore, comprises at least one guide arrangement by which the guide pin is mounted in a longitudinally displaceable manner in a region of the bore depth extending into the brake carrier.

19. The brake caliper guide according to claim 13, wherein the shaft is at least twice a length of the sliding sleeve.

20. A brake caliper guide for a floating caliper disk brake, comprising: at least one guide pin attached to a brake carrier, having a head and a shaft, a brake caliper having at least one guide bore which has an entry region and a bore depth extending into the brake caliper, and a guide device inserted into the entry region of the guide bore having a sliding sleeve arranged in an elastomer sleeve, wherein the shaft of the guide pin is mounted in a longitudinally displaceable manner in the sliding sleeve in such a way that the head is located outside the brake caliper, and a region of the shaft which is located on a side of the guide device oriented toward the bore depth projects into the guide bore, wherein an end face of the sliding sleeve which is oriented toward an outer face of the brake caliper has a first collar which extends radially outwardly, wherein the elastomer sleeve overlaps the sliding sleeve and adjoins the first collar and is delimited in a longitudinal extent thereof by this collar, and/or wherein the end face of the sliding sleeve, which is oriented toward the outer face of the brake caliper, has a first collar which extends radially outwardly, and wherein an end face of the sliding sleeve, which is oriented toward the bore depth of the guide bore, has a second collar which extends radially outwardly, wherein the elastomer sleeve is arranged between the first and the second collar and is delimited in the longitudinal extent thereof by the collars.

21. The brake caliper guide according to claim 20, wherein the entry region has a cylindrical inner surface having an inside diameter which forms a receiving portion for a cylindrical outer surface of the elastomer sleeve and is in contact with the cylindrical outer surface of the elastomer sleeve, wherein the sliding sleeve has an inner sliding side in sliding contact with the shaft and an outer receiving side having an outer surface which is cylindrical at least in part and has an outside diameter, which forms a receiving portion for a cylindrical inner surface of the elastomer sleeve and is in contact with the cylindrical inner surface of the elastomer sleeve, wherein the radial distance between the inner diameter and the outer diameter defines a thickness of a part of the elastomer sleeve which is located between the cylindrical inner surface and the cylindrical outer surface when installed, wherein a transition region extends at an angle with respect to the elastomer sleeve, and wherein the dimension of the collar height of the second sliding sleeve collar in the radial direction, starting from the cylindrical outer surface, is at least half the size of the dimension of the thickness.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0031] The disclosure will be described in greater detail below with reference to the accompanying schematic drawings. This description is the explanation of one exemplary arrangement. For the sake of clarity, not all the elements shown in a drawing are necessarily provided with a reference sign. However, corresponding elements or regions are then labeled at least in another drawing, and the meaning can be found therein.

[0032] FIG. 1 is a sectional view of the brake caliper guide:

[0033] FIG. 2 is an enlarged detail of the brake caliper guide shown in FIG. 1;

[0034] FIG. 3 is a perspective sectional view of the region of the guide device:

[0035] FIG. 4 shows the guide device without guide pins;

[0036] FIG. 5 shows the guide device;

[0037] FIG. 6 shows the sliding sleeve; and

[0038] FIG. 7 shows diagrams with path (SR)—force (FR)—progressions;

DETAILED DESCRIPTION

[0039] As can be seen in FIGS. 1 to 4, in an exemplary arrangement, the brake caliper 2 is mounted so as to be axially displaceable with respect to the brake carrier 3 by two guide pins 20 (as a result of the sectional view, only one guide pin is shown) which are each guided in a guide device 30. The guide devices 30 are each inserted into the entry region 11 of a guide bore 10. The guide bore 10 extends in the form of a blind hole from the outer face 4 of the brake carrier 3 with a bore depth 12 thereinto. The entry region 11 has a greater diameter D1 in comparison with the bore diameter of the rest of the guide bore 10, which is used as a seat for the guide device 30. The guide device 30 has a sliding sleeve 50, an elastomer sleeve 40 and a sealing arrangement 31. The elastomer sleeve 40 and the sealing arrangement 31 includes an elastomer material and are integrally interconnected by a transition region 35. When viewed in the longitudinal section of the guide device 30 (see for example FIG. 2), the transition region 35 extends radially outwardly as an extension of the elastomer sleeve 40 at an angle of 90° (in an L shape) to the longitudinal extent of the elastomer sleeve. While the elastomer sleeve 40 is located inside the entry region 11, the transition region 35 protrudes out of the entry region 11 and transitions into parts of the sealing arrangement 31 described in the following. As can be seen in FIGS. 3 to 5, the sealing arrangement 31 comprises a guide pin connection 32, to which the arrangement is fixed in a sealing manner on the guide pin head 21, and a brake carrier connection 33, to which the arrangement is fixed in a sealing manner on the brake carrier 3. The guide pin connection 32 and the brake carrier connection 33 are interconnected by a protective bellows 34.

[0040] According to for example FIGS. 2 and 4, the guide device 30 is inserted into the entry region 11 of the guide bore 10 in such a way that the cylindrical inner surface 13 of the entry region 11, with the inside diameter D1, is in contact with the cylindrical outer surface 41 of the elastomer sleeve. The elastomer sleeve 40 has a cylindrical inner surface 42 and a cylindrical outer surface 41 and has a specific length. The sliding sleeve 50 has an inner sliding side 55 and an outer receiving side 56 having a cylindrical outer surface 57 with an outside diameter D2 which forms a receiving portion for the cylindrical inner surface 42 of the elastomer sleeve. The cylindrical outer surface 57 of the sliding sleeve 50 is in contact with the cylindrical inner surface 42 of the elastomer sleeve. The radial distance between the dimension reference lines of the dimensions D1 and D2 defines the thickness t of the part of the elastomer sleeve 40 located between the cylindrical inner surface 13 of the guide bore and the cylindrical outer surface 57 of the gliding sleeve 50 when installed.

[0041] The sliding sleeve 50 comprises, on the end faces thereof, in each case one collar 53, 54 extending radially outwardly. The possible longitudinal extent of the elastomer sleeve 40 is delimited by the two collars 53, 54, since the sleeve is arranged in the receiving region of the sliding sleeve 50 between these collars. The collars can be seen particularly well in FIGS. 2 and 6.

[0042] The first collar 53 is arranged on the end face 51 which is oriented toward the outer face of the brake carrier. The second collar 54 is arranged on the end face 52 which is oriented toward the bore depth 12 of the guide bore 10.

[0043] The dimension of the collar height HB1 of the first sliding sleeve collar 53 in the radial direction, starting from the cylindrical outer surface 57, is approximately three times as great as the dimension of the thickness t, and therefore this collar 53 axially supports the angled transition region. The dimension of the collar height HB2 of the second sliding sleeve collar 54 in the radial direction, starting from the cylindrical outer surface 57, is approximately 0.7 times the size of the dimension of the thickness t, and therefore this collar 54 axially supports the inner end of the elastomer sleeve 40.

[0044] The guide pins 20 each have a head 21 and a shaft 22. The head 21 is fixed to the movable brake caliper 2. The shaft 22 is mounted in the sliding sleeve 50 in an axially displaceable manner. In this case, the outside diameter of the shaft 22 is in sliding contact with the inner sliding side 55 of the sliding sleeve 50. In this case, two radially circumferential sliding connecting pieces 58 form the sliding contact points. The shaft end 23 of the shaft 22 projects into the bore depth 23 of the guide bore 10 and is likewise guided in the guide bore 10 in an axially displaceable manner by a guide means 24.

[0045] The axial support or definition, produced by the sliding sleeve collars, of an axial longitudinal extent of the elastomer sleeve 40 means that in the case of a radial force acting on the guide system and a resulting radial deflection of the guide pin 20 in the guide device 30, the reaction force FR that the guide device 30 exerts on the guide pin 20 greatly increases, and an overly great radial deflection and thus unwanted contact between other guide parts is prevented. In this case, it is decisive that the elastomer sleeve 40, which is received in the receiving region of the sliding sleeve between the collars 53, 54 and allows rigid guidance of the guide pin 20 in the radial direction between the guide bore 10, 11 and the sliding sleeve 50. In the case of low radial forces, the elastomer sleeve 40, in the predominantly relaxed state, in turn allows good damping and low sliding frictional force between the guide pin 20 and the sliding sleeve 50. The good sliding quality is supported by a metal-on-metal sliding friction pair. In other words, both the sliding sleeve 50 and the guide pin 20 are produced from metal.

[0046] The shaft 22 is approximately five times the length of the sliding sleeve 50. In other words, the length of the elastomer sleeve 40 can be designed to be short in comparison with the overall dimensions of the brake caliper guide 1 as a result of the rigidity thereof in the event of radial forces.

[0047] As can be seen in FIG. 6, the sliding sleeve 50 is provided with a continuous longitudinal slot 59. The longitudinal slot is used firstly to compensate for production tolerances, and secondly the sliding sleeve 50 and the longitudinal slot 59 thereof are designed in such a way that when the shaft 22 is introduced through the sliding sleeve, this sleeve is radially spread apart and thus preloaded. The elastomer sleeve 40 is thus likewise radially preloaded, and the outside diameter thereof is enlarged. In other words, when not preloaded, the guide device can be inserted into the guide bore 10 or into the entry region 11 more easily. When inserting the guide pin 20 or the shaft 22 through the sliding sleeve 50, this sleeve is preloaded, and the outer surface 41 of the elastomer sleeve 40 is pressed onto the cylindrical inner surface 13 of the entry region 11 in such a way that the guide device 30 is securely fixed in the guide bore 10. The higher coefficient of friction which acts in the seat between the outer surface 41 of the elastomer sleeve 40 and the cylindrical inner surface 13 of the entry region 11 in comparison with the sliding friction pair of the sliding sleeve 50 and the guide pin shaft 22 also contributes to secure fixing.

[0048] FIG. 7 shows force progressions of the radial force and a corresponding reaction force FR as a function of the radial guide pin deflection SR in two diagrams. The information is based on the respective use of an elastomer sleeve having a SHORE A hardness of 50. The case A illustrated shows the force progression when using an elastomer sleeve without axial definition. Case B shows the force progression when using the axially defined elastomer sleeve according to the disclosure. In this case, the maximum absolute radial forces to be achieved are not that important. These can be adapted by selecting the degree of hardness. It is more relevant that the gradient of the force progression of the radial force FR as a function of the radial deflection SR in the solution according to the disclosure is substantially greater than in a solution without axial definitions of the elastomer sleeve. In the case of a small pin deflection SR, this force progression results in low frictional forces and good sliding properties. In the case of large pin deflections SR, the required guiding rigidity is achieved by the high increase in the reaction force.