Brake caliper with reset device

Abstract

A brake caliper configured as a floating caliper (1) comprising an armature (2) and a caliper flange (3), as well as a linear guide (4) having at least one guide element (6) that is fixed on one side and movably mounted at its free end (8) in a guide bushing (9), wherein the guide bushing (9) has a reset device (19) that has a bolt contact surface (22) that has an inner diameter that is smaller than an outer diameter of the guide element (6), wherein the reset device (19) has a ring (27) and a contact web (28), as well as an inner elevation (26) arranged on the guide bushing (9), wherein the contact web (28) extends from the ring (27) toward the inner elevation (26), wherein the guide bushing (9) has rib-like elevations (26) on its inner circumference, wherein the elevations (26) are in contact with the surface of the guide element (6) with their free end,wherein the return device (19) with its ring (27) and its contact web (28) is arranged near the free end (8) of the guide element (6) inside the guide bushing (9), and wherein the return device (19) further comprises the ring (27), which has an inner diameter that is smaller than the outer diameter of the guide element (6), wherein the opposite surface of the ring (27) is spaced from the inner surface of the guide bushing (9), and wherein the ring (27) has the contact web (28) on a side arranged towards a threaded portion (12) of the guide element (6), which contact web is supported on the next elevation (26).

Description

The invention relates to a brake caliper in the form of a floating caliper.U.S. Pat. No. 4,458,790 A discloses a brake caliper having an anchor and a caliper rod and a linear guide which has at least one guide element which is fixed on one side and is movably mounted at its free end in a guide bush, wherein the guide bush has a restoring device which has a bolt bearing surface which has an inner diameter which is less than an outer diameter of the guide element, wherein the restoring device has a ring and an inner elevation arranged on the guide bush, wherein the ring has a bearing web on its side arranged in the direction of a threaded section of the guide element, wherein the bearing web extends from the ring in the direction of the inner elevation and is supported on the latter.DE 36 43 922 A1 discloses an elastic damping element for disc brakes.US 2013 / 0 062 149 A1 also concerns a brake caliper.DE 25 21 871 A1 discloses a bolt guide in which the bolt is guided through a guide bore of an elastic guide element, wherein the guide element exerts a restoring and adjusting action. After a limited elastic deformation has been exceeded, the guide element has a permanent change in shape.U.S. Pat. No. 7,721,854 B1 likewise discloses a brake caliper. DE 36 16 695 A1 also concerns a brake caliper.Brake calipers mentioned at the beginning are used, for example, as a floating caliper in vehicle brakes. In the floating caliper or also a Fist-type caliper, a brake piston is arranged behind only one of the brake pads arranged on both sides of a brake disc, while the brake pad remote from the brake piston is fastened to the floating caliper. In wheel brakes, the brake piston is usually located on the side of the floating caliper facing away from the wheel because of the small installation space available, and therefore usually acts on the inner brake lining. The floating caliper is displaceable in the axial direction of the brake disc, i.e. supported in a floating manner. If the brake piston is pressurized, the floating caliper is aligned, thanks to its linear guide, in such a way that both brake pads are pressed with the same force onto the brake disc. The linear guide is formed in that a guide element is fixed on one side in an anchor of the floating saddle, i.e. for example screwed, wherein a free end of the guide element opposite thereto reaches through an eye of the saddle chamfer and is mounted in a guide element so as to be axially movable. However, it is also possible for the guide element to be movable with its free end in a guide sleeve of the anchor, wherein the guide element is fixed to the eye of the saddle frame.When the braking process is ended, the brake piston, in cooperation with a piston seal, causes the corresponding brake lining, that is to say usually the inner brake lining, to be pulled back, with the result that the latter is held spaced apart from the brake disk again in its rest position. The other brake lining, i.e. usually the outer brake lining, on the other hand, is usually moved back into its rest position by the action of the brake disk. This is effected by the existing side impact of the brake disc, so that the gap is generated between the brake pad and the effective surface of the brake disc. This, however, results in an undesired deceleration of the vehicle, since the brake pads are also in contact with the brake disc outside the desired braking process. In a motor vehicle with four wheels, this is carried out in all four wheels in such a way that a very high resistance against the direction of travel is produced. This immediately causes a high counter torque, which must be overcome by the driving motor, so that its consumption increases. However, this effect is also observed in the case of possible faults in the brake disk-brake lining system.Not only is the increasing consumption disadvantageous. It is also observed that, due to the striking and rubbing of the brake disc, the wear, for example of the outer brake lining, is greater than on the inner brake lining. Thus, the brake pads must be replaced very early, wherein in principle a pair of brake pads, i.e. the inner and outer brake pads, should be replaced together, wherein the inner brake pad may not yet have to be replaced on account of its lower wear. However, it can also be that noise is emitted by the accidental impact of the brake disk on the brake lining, so that occupants of the vehicle could conclude that the brake system is defective. Quiet noises can also arise, so that the occupants could infer an inferior vehicle.EP 2 314 895 B1 relates to a brake caliper with a control for adjusting and resetting the brake lining. The caliper housing has two fixed sides disposed on opposite sides of a brake disc. Each brake disc side is assigned a brake lining. Each brake pad is assigned brake pistons. Each brake piston is assigned a brake lining timing and retraction device, which has a Belleville spring in each case, which interacts with a brake caliper retraction ring in each case. The control thus causes the brake pads to be positively withdrawn from the brake disc by a uniform distance during the life of the brake pads and the brake disc.WO 2016 / 009 375 A1 discloses a brake pad retraction device which is separate from the brake piston. In this case, WO 2016 / 09375 A1 also starts from a fixed brake caliper which has brake pistons acting on brake pads on each side of the brake disc. The retraction device of the respective brake pad is designed such that the respective brake pad can be retracted independently of the respective others.In view of the state of the art shown, brake calipers, in particular, swimming calipers, still offer room for improvements.The invention is based on the object of making available a brake caliper which is improved with simple means and by means of which undesired deceleration of the vehicle counter to the direction of travel can be avoided, with the result that the consumption of the driving motor can be reduced, wherein at the same time brake pads on both sides of the brake disc have substantially identical wear.According to the invention, this object is achieved by a brake caliper having the features of claim 1.What is shown is a brake caliper in the embodiment as a floating caliper having an anchor and a caliper rod and a linear guide which has at least one guide element which is fixed on one side and is movably mounted at its free end in a guide bush, wherein the guide bush has a restoring device which has a bolt bearing surface which has an inner diameter which is less than an outer diameter of the guide element, wherein the restoring device has a ring and a bearing web, and an inner elevation arranged on the guide bush, wherein the bearing web extends from the ring in the direction of the inner elevation, wherein the guide bush has rib-like elevations on its inner circumference, wherein the elevations are in contact with the surface of the guide element by way of their free end, wherein the restoring device is arranged with its ring and its contact web near the free end of the guide element in the interior of the guide bushing, and wherein the restoring device further comprises the ring which has an inner diameter which is less than the outer diameter of the guide element, wherein the surface of the ring opposite thereto is spaced apart from the inner surface of the guide bushing, and wherein the ring comprises the contact web on a side arranged in the direction of a threaded section of the guide element, which contact web is supported on the next elevation.It should be noted that the features and measures individually listed in the following description can be combined with one another in any technically meaningful manner and reveal further configurations of the invention. The description additionally characterizes and specifies the invention, in particular in conjunction with the figures.As mentioned, the brake caliper has an anchor and a caliper thumb and a linear guide having at least one guide element which is fixed on one side and is mounted movably with its free end opposite it in a guide bushing. The guide bush has a restoring device, so that the guide element can be transferred from a use position into a rest position after a braking operation.During a braking operation, the floating caliper is aligned, thanks to its linear guide, in such a way that both brake pads are pressed onto the brake disc with the same force. After the braking process, both brake pads are moved back by the brake disc. This is effected on the one hand by means of the brake piston which acts directly on the relevant brake lining. On the other hand, the restoring device brings about the return movement of the other brake lining from the brake disc. The brake piston advantageously acts on the inner brake lining, so that the restoring device acts only on the other, i.e. outer, brake lining.The guide element can also be referred to as a guide bolt, which has a threaded section at its fastening end, which is screwed to a corresponding thread within a receptacle, preferably of the anchor, so that the guide element is preferably fixed to the anchor. The threaded section is adjoined by a base body which extends in diameter unchanged as far as the free end. In this respect, the base body can be referred to as a cylindrical base body. The base body can also be designed to taper or thicken in the direction of the free end. The change in diameter can take place continuously or in steps. The guide element is preferably made of a metal. The transition of the threaded section to the base body is designed step-like, so that the end face of the base body facing the threaded section is designed as a counter surface. Thus, for example, excessively deep screwing into the receptacle is avoided.The guide element protrudes with its free end out of the receptacle and with its base body reaches through an eye of the saddle thumb. The guide bushing is accommodated in the eye. The guide bush is open on one side. The opening is oriented in the direction of the anchor. The guide bush has a receiving section and a bearing section adjoining thereto. With the receiving portion, the guide bushing is received in the eye in a positionally secure manner. The bearing portion extends away from the eye and the anchor.The reset device is advantageously designed as a spring-elastic element. When the guide element is transferred from its rest position in the direction of its use position, the spring-elastic element is thus quasi tensioned and stores the absorbed force. It is advantageous that the spring-elastic element does not execute a relative movement with respect to the guide element, but is carried along with the guide element. If the brake pressure is reduced, that is to say after the braking process, the restoring device brings about, as a result of the restoring force, a return of the guide element into the rest position and thus a transfer of the brake lining, which is not loaded by the brake piston, into its rest position. This is achieved by the relaxing spring-elastic element, which pulls the guide element back into its initial position.In order to be able to tension the restoring device, i.e. the spring-elastic element, it is provided that the restoring device has a bolt contact surface which has an inner diameter which is smaller than an outer diameter of the guide element, i.e. of the base body. Thus, the restoring device has a frictional engagement with the surface of the guide element with its bolt contact surface, wherein the bolt contact surface is carried along when the latter is deflected in the direction of the use position. The restoring device can be designed as a solid body and fill the annular space between the inner periphery of the guide bushing and the outer periphery of the guide element. Of course, the restoring device can also be interrupted along its longitudinal axis. The aim is achieved when the bolt contact surface is continuously in contact with the corresponding surface of the guide element as viewed in the circumferential direction.The aim is when the restoring device has a saw-tooth-like configuration, wherein the tooth tips form the respective bolt contact surface. The tooth bases opposite the tooth tips are in direct connection with the inner periphery of the guide bushing. Thus, each individual tooth can be deflected according to the movement of the guide element and store the necessary restoring force. The saw-tooth-like configuration offers the advantage of a very simple setting of the desired properties of the restoring device. Thus, the tooth height and tooth width, but also the stiffness of the material, directly influence the effective restoring force of the spring-elastic element, and thus also the distance of the brake pad to be adjusted from the brake disk. This, in turn, can be used to generate different tensile forces and can also be used to adjust the brake pedal feel.The guide bushing, but also the restoring device, can consist of a plastic, that is to say for example of a rubber material, for example of a terpolymer elastomer (EPDM).Advantageously, the guide bushing can be configured integrally with the restoring device. In this case, the bolt bearing surface can be different in its elastic properties from an outer jacket of the guide bushing. The restoring device can extend over the entire length of the guide bushing and preferably comprises the surface of the guide element over its full circumference with its bolt contact surface. It is also possible if the restoring device is arranged only in the receiving section or in the bearing section or in regions of the guide bushing. It is preferred if the restoring device is arranged in the bearing section of the guide bushing.The restoring device can also be inserted as a separate inlet into the guide bushing, wherein an outer periphery of the inlet can be connected to the inner periphery of the guide bushing in a positionally secure manner, wherein adhesive connections are preferably also conceivable, however, other connection types, such as connections by plastic welding or frictional connections. If a separate inlet is provided, the material properties of the guide bushing and of the inlet can likewise be set independently of one another, wherein different properties with regard to rigidity and elasticity are also possible in the case of a restoring device integral with the guide bushing. Of course, it is possible that an outer periphery of the restoring device, when it is configured separately from the guide bushing, is spaced apart from the inner surface thereof. Nevertheless, despite the contact-free embodiment to the inner periphery of the guide bush, a return of the guide element would also be possible upon termination of the braking process, but wear compensation would also be possible, which will be discussed in more detail later.With the invention, uniform wear of the brake linings is thus achieved, since the brake lining not acted upon by a brake piston is also very rapidly removed from the brake disk by the restoring device and held at a distance therefrom. The pushing back of the relevant brake lining by the brake disk, which has caused the uneven wear, as known in the prior art, can thus be avoided. The otherwise customary, random impact of the brake disk on the relevant brake pad is also avoided, since the relevant brake pad is held in the desired position, that is to say at the desired distance from the brake disk.Of course, the brake pads are subject to operational wear, so that the friction surfaces of the brake pads, but also of the brake disc, are removed. This would mean that the gap between the brake pads, i.e. between the outer brake pad and the brake disc, would become too large, so that a spongy brake feel is obtained, which is to be avoided for safety reasons. This situation is also taken into account by the invention in that the resetting device simultaneously functions as an adjusting or tracking device. If the guide element is transferred into its use position during braking and if this transfer path is so large that the set coefficient of friction of the bolt contact surface with respect to the surface of the guide element is exceeded, a relative movement of the guide element with respect to the guide bushing is produced. In this case, the guide element slides along the restoring device, wherein the restoring device simultaneously slides back into its initial position, with the result that the entire system is virtually reset to the initial state. However, the functionality according to the invention is restored, wherein the wear has simultaneously been compensated.If the restoring device has the sawtooth-like configuration, the teeth would first be deflected and slide back into their non-deflected position, wherein the guide element is moved relative to the guide bushing, so that the entire system is virtually reset to the initial state. However, the functionality according to the invention is restored, wherein the wear has simultaneously been compensated.As mentioned above, the restoring device has a ring on which a contact web is arranged. On the inner circumference of the guide bush, elevations are arranged. The contact web extends in the direction of a directly adjacent elevation. The bearing web extends in a straight line from the ring to the elevation. The bearing web can be formed on both the elevation and on the ring. It is also possible if the bearing web is either separate from the ring and is integrally formed on the elevation, or if the bearing web is separate from the elevation and is integrally formed on the ring. The restoring device is arranged near the free end of the guide element in the interior of the guide bushing. During a braking process, the contact web is compressed, so that the required restoring force is generated. When the braking operation is ended, the guide element is moved into its initial position by the restoring force. The readjustment function is also provided in this embodiment. If the closure of the brake lining and / or of the brake disk is too great, the ring slides with its bolt contact surface on the surface of the guide element, so that the wear is compensated for.Although the invention has been described so far in such a way that the guide element, which can also be referred to as a guide bolt, is screwed into the anchor and is movable relative to the saddle chamfer, it can naturally be provided to connect the guide element to the saddle chamfer in a positionally secure manner and to support the free end movably in a guide bushing of the anchor. The restoring device could thus, simultaneously with the restoring of the guide element and thus of the relevant brake lining into its rest position, additionally assume centering functions within the guide bushing for the setting or tracking function.Further advantageous embodiments of the invention are disclosed in the dependent claims and the following description of the figures. The following are shown: FIG. 1 shows a brake caliper in a perspective view, FIG. 2 shows a guide element as a detail, FIG. 3 is a sectional view through a guide bush with the restoring device in a rest position, FIG. 4 shows the sectional view from FIG. 3 with the restoring device in a use position, FIG. 5 is the sectional view from FIG. 3 with the restoring device in the operating case of brake medium wear, FIG. 6 shows a sectional view through a further exemplary embodiment in a rest position, and FIG. 7 shows the sectional view from FIG. 6 in a use position.In the different figures, identical parts are always provided with the same reference numerals, which is why they are generally also described only once.FIG. 1 shows a brake caliper in the form of a floating caliper 1. the floating caliper 1 has an anchor 2, a caliper chamfer 3 and a linear guide 4. Brake pads which cannot be seen are held on the floating caliper. An inner brake lining is arranged on the right side of the floating caliper in the drawing plane. A brake piston, which is not visible, acts directly on the inner brake lining. The other, i.e. outer, brake lining is arranged movably guided on the armature 2.The linear guide 4 has a guide element 6, which is fixed in a receptacle 7 of the anchor 2 on the one hand. On the other hand, the guide element 6 is held with its free end 8 (FIG. 2 ) in a guide bushing 9 of the saddle frame 3 in a linearly movable manner. As can be seen in FIG. 1, the floating saddle 1 has two guide elements 6, which are each arranged laterally of the anchor 2 and are accommodated in the respective receptacle 7 of the anchor 2 and the respective guide bushing 9.The guide element 6 (FIG. 2 ) can also be referred to as a guide bolt, which has a threaded section 12 at its fastening end 11, which threaded section is screwed to a corresponding thread within the receptacle 7 of the anchor 2, so that the guide element 6 is fixed to the anchor 2. The threaded section 12 is adjoined by a base body 13 which extends in diameter unchanged as far as the free end 8. In this respect, the base body 13 can be referred to as a cylindrical base body. The guide element 6 preferably consists of a metal. A transition 14 of the threaded section 12 to the base body 13 is designed step-like, so that the end face of the base body 13 facing the threaded section 12 is designed as a counter surface.The guide element 6 projects beyond the receptacle 7 of the anchor 2 and reaches through an eye 16 of the saddle chamfer 3 with its base body 13.The guide bush 9 is open on one side and is preferably closed on the other side by a plug. The opening is oriented in the direction of the armature 2. The guide bush 9 has a receiving portion 17 and a bearing portion 18 adjoining thereto. With the receiving section 17, the guide bushing 9 is held in the eye 16 in a positionally secure manner. The bearing section 18 extends away from the receiving section 17 and the armature 2.The guide bush 9 has a restoring device 19 (FIGS. 3 to 7 ). In FIG. 3, a section of the base body 13 can be seen in each case only. A bolt contact surface 22 of the restoring device 19 has an inner diameter which is smaller than an outer diameter of the guide element 6, that is to say of the main body 13. Thus, the restoring device 19 has a frictional engagement with the surface of the guide element 6 with its bolt contact surface 22, wherein the bolt contact surface 22 is carried along when the latter is deflected in the direction of the use position, as can be seen in FIG. 4.The restoring device 19 has a saw-tooth-like configuration, wherein its teeth 20, that is to say its tooth tips 21, form the bolt contact surface 22.Thus, each individual tooth 20 can be deflected in accordance with the movement of the guide element 6, and the restoring device 19 can thus store the necessary restoring force. The saw-tooth-like configuration offers the advantage of a very simple adjustment of the desired properties of the restoring device 19. the tooth height and tooth width, but also the rigidity of the material, have a direct influence on the effective restoring force and thus also on the distance of the brake lining to be adjusted from the brake disc. This, in turn, can be used to generate different tensile forces and can also be used to adjust the brake pedal feel.Of course, the brake pads are subject to operational wear, so that the friction surfaces of the brake pads, but also of the brake disc, are removed. This would mean that the gap between the brake pads, i.e. between the outer brake pad and the brake disc, would become too large, so that a spongy brake feel is obtained, which is to be avoided for safety reasons. This situation is also taken into account by the invention in that the resetting device 19 simultaneously functions as an adjusting or tracking device. If the guide element 6 is transferred into its use position during braking and if this transfer path is so large that the set coefficient of friction of the bolt contact surface 22 with respect to the surface of the guide element 6 is exceeded, a relative movement of the guide element 6 with respect to the restoring device 19 is produced. In this case, the guide element 6 slides along the restoring device 19, the teeth initially being deflected and then sliding back into their non-deflected position. This is indicated in the figure by means of the double arrow 23. The guide element 6 is moved relative to the guide bush 9, so that the entire system is virtually reset to the starting state. However, the functionality according to the invention is restored, wherein the wear has simultaneously been compensated. During a further braking operation, the state according to FIGS. 3 and 4 would again be reached.FIGS. 6 and 7 show a further exemplary embodiment of a resetting device 19. The restoring device 19 is accommodated in the guide bush 9, which has rib-like elevations 26 on its inner periphery. The elevations 26 are in contact with the surface of the guide element 6 with their free end, so that a slide bearing is formed in a manner of speaking. The rib-like configuration brings about, among other things, stability advantages of the guide element 6 and brings about a centering of the guide element 6 in the guide bushing 9.The restoring device 19 also has a ring 27 which has an inner diameter which is smaller than the outer diameter of the guide element 6, thus ensuring a frictional contact of the inner ring surface with the outer surface of the guide element 6. By way of example, the surface of the ring 27 opposite thereto is spaced apart from the inner surface of the guide bushing 9. The ring 27 is designed with its bolt bearing surface 22 in such a way that it is possible to dispense with bearing on the interior of the guide bush 9. On a side arranged in the direction of the threaded section 12 of the guide element 6, the ring 27 has a contact web 28 which is supported on the next elevation 26. The contact web 28 is designed to be elastic.The ring 27 together with the bearing web 28 can be separate from the guide bushing 9, wherein the elevations 26 can likewise be separate from the guide bushing 9. In such a case, the elevations 26 are connected in a positionally secure manner to the inner surface of the guide bushing 9, for example adhesively bonded or welded using plastic technology, and bear with their free ends against the surface of the guide element 6 preferably over the full circumference or else interrupted in the circumferential direction, in order thus to form the sliding bearing.It is of course also possible for the ring 27 to be designed as a separate inlet to the guide bush 9 and to be accommodated in the guide bush 9 in a positionally secure manner via its outer diameter. A one-piece configuration of the ring 27 together with the contact web 28 and the elevations 26 with the guide bushing 9 is also possible.If the guide element 6 is now led out of the guide bush 9 as a result of a braking process, the bearing web 28 is compressed (FIG. 7 ). When the braking process is ended, the restoring force stored in the bearing web 28 in this way is brought about for returning the guide element 6 into its initial position, that is to say into its rest position.For the purpose of adjusting the brake lining during wear, the ring 27 slides along the guide element 6, with the result that an adjustment function is implemented as before. In this case, despite its preferably contact-free configuration with respect to the inner surface of the guide bush 9, the ring 27 with its bolt bearing surface 22 is designed to be frictionally engaged with the surface of the base body 13 in such a way that sliding along said bolt surface is effected with a defined introduction of force.The exemplary embodiment in relation to FIGS. 6 and 7 shows a guide bushing 9, which is only schematically illustrated and in which a separate illustration of the receiving section and of the bearing section has been dispensed with.In the exemplary embodiment shown in FIGS. 6 and 7, the restoring device 19, i.e. the ring 27 with the bearing web 28 and the elevations 26, is arranged on an inner side of the guide bushing 9. The distance of the ring 27 from the free end 8 of the guide element 6 is sufficient so that the readjustment, i.e. compensation, function is provided at all times. It is also possible to arrange the restoring device 24 with ring 27 and bearing web 28 opposite thereto on an outer side, or in between.List of reference numbers:1 Floating saddle 2 anchor 3 saddle chamfer 4 linear guide 5 6 guide element 7 receptacle at 2 8 free end of 6 9 guide bush 10 11 fastening end of 6 12 threaded section 13 base body 14 transition 15 16 eye at 3 17 receptacle section of 9 18 bearing section of 9 19 restoring device 20 21 tooth tips 22 bolt contact surface 23 double arrow 24 25 26 elevation 27 ring 28 contact web

Claims

Brake caliper in the embodiment as a floating caliper (1) having an anchor (2) and a caliper rod (3) and a linear guide (4) which has at least one guide element (6) which is fixed on one side and is mounted movably at its free end (8) in a guide bush (9), wherein the guide bush (9) has a restoring device (19) which has a bolt bearing surface (22) which has an inner diameter which is less than an outer diameter of the guide element (6), wherein the restoring device (19) has a ring (27) and a bearing web (28), and an inner elevation (26) arranged on the guide bush (9), wherein the bearing web (28) extends from the ring (27) in the direction of the inner elevation (26), wherein the guide bush (9) has rib-like elevations (26) on its inner periphery, wherein the elevations (26) are in contact with the surface of the guide element (6) with their free end, wherein the restoring device (19) is arranged with its ring (27) and its contact web (28) near the free end (8) of the guide element (6) inside the guide bushing (9) and wherein the restoring device (19) further comprises the ring (27) which has an inner diameter which is less than the outer diameter of the guide element (6), wherein the surface of the ring (27) opposite thereto is spaced apart from the inner surface of the guide bushing (9), and wherein the ring (27) comprises, on a side arranged in the direction of a threaded section (12) of the guide element (6), the contact web (28) which is supported on the next elevation (26).Brake caliper according to claim 1, characterised in that the guide bush (6) is produced together with the restoring device (19) and is arranged on the guide element (6) by friction via its bolt contact surface (22), wherein the guide bush (6) and the restoring device (19) are in one piece and consist of a plastics material.Brake caliper according to claim 1 or 2, characterised in that the guide bush (6) and the restoring device (19) consist of a rubber material.Brake caliper according to Claim 1 or 2, characterized in that the guide bush (6) and the restoring device (19) consist of a terpolymer elastomer.Brake caliper according to Claim 1, characterized in that the restoring device (19) is accommodated as a separate inlet in the guide bush (6) and is arranged in a frictionally locking manner via its bolt bearing surface (22) on the guide element (6), at least the restoring device (19) being composed of a plastic.Brake caliper according to claim 5, characterised in that at least the restoring device (19) consists of a rubber material.Brake caliper according to Claim 5, characterized in that at least the restoring device (19) consists of a terpolymer elastomer.

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