DE202010003739U1 - disc brake - Google Patents

Abstract

Disc brake having a brake caliper (1), which surrounds at least one brake disc, and a brake actuating mechanism (17) with
A reinforcing mechanism (18) for introducing a clamping force,
- An adjusting device (19) to compensate for a lining wear with a torque clutch,
- A pressure element (20) for transmitting the application force to the brake disc, and
A reset device (21),
the reinforcing mechanism (18), the adjusting device (19), the pressure element (20) and the restoring device (21) being functionally cooperating in the caliper (1) by means of a rod (22) immovably mounted in the housing of the caliper (1) in the axial direction. are mounted,
characterized in that
the reinforcing mechanism (18), the adjusting device (19), the pressure element (20) and the return device (21) on one side and the rod (22) on the other side are designed and dimensioned in the axial direction so that when installed the brake actuating mechanism (17) the restoring device (21) under formation of a defined torque limit for the torque clutch under bias ...

Description

The The present invention relates to a disc brake, in particular for a commercial vehicle, and a method of manufacture or assembly of such a disc brake.

in this connection Disc brakes are included in the invention, either a Sliding saddle or have a fixed caliper, and the one or more Override brake discs. The invention mainly relates but not exclusively, on partially coated disc brakes.

Disc brakes, especially for heavy trucks, are in the most diverse Embodiments are known, both as regards the type of actuating mechanism, the way of transmitting the braking force to a or more brake discs as well as the type of adjustment for Balancing the brake lining wear.

For example, from the EP 0 271 864 B1 an actuator is known in which an axial actuator is mounted in a caliper housing about which a plurality of components of the brake mechanism are arranged. The adjustment device provided for this purpose and the reinforcing mechanism used in the form of a roller-ramp mechanism have a large number of individual components which make assembly more difficult and therefore cost-intensive. In addition, in connection with the assembly of this disc brake used for use caliper must be provided both on the rear side of the caliper housing and on the side of the brake disc out with many openings, which, however, associated with significant sealing problems.

Furthermore, from the EP 0 553 105 B1 a braking mechanism known which uses a lever mechanism for transmitting the clamping force. Although this brake mechanism is less complex than the aforementioned, its installation in the caliper housing proves to be cumbersome and therefore time-consuming, since during assembly in the interior of the housing a rotatable connection between a pressure piece and the lever is formed by a roller body to be arranged therebetween must be maintained. In addition, the brake mechanism so accomplished can be introduced only from the rear of the caliper, resulting in a relatively large opening in the rear part of the caliper housing or even a two-part, provided with a parting caliper, which inevitably significant sealing problems appear. In addition, it is a consequence of the exclusive rotational connection between the lever and the pressure piece, the latter engages for lack of a kinematically additionally required degree of freedom with slight inclination on the brake pad, whereby an uneven abrasion on the brake pad occurs.

To avoid this latter problem is in the art, for example in the EP 0 698 749 B1 has been proposed to provide such an additional degree of freedom in a lever-operated brake mechanism so that a strict axial linear guide of the pressure piece in the direction of the brake disc for a plane concerns of the brake pad is made possible. The disclosed in this document brake mechanism is introduced during assembly with its individual components both from the brake disc side and the side facing away from this of the caliper ago and assembled inside thereof, which in turn must be provided several, causing sealing problems openings. In addition, such assembly also proves to be cumbersome and therefore costly.

From the WO 01/75324 A1 a braking mechanism is known in which the pressure element for transmitting the application force is arranged around a central rod around. In the embodiment of the braking mechanism shown therein, however, a variety of individual components is used, which must cooperate in a complicated manner. The brake mechanism uses a cross member, which occupies a considerable space in the caliper, whereby the brake mechanism has a high overall weight and is rather unwieldy overall. The installation of such a braking mechanism thus proves to be cumbersome.

To address the above-mentioned problems and disadvantages of the disc brakes of the described prior art, suggests the WO 2004/059187 A1 the applicant to form an actuating mechanism in the form of a single axial plunger or pressure element, which acts on the brake disc, wherein an adjusting device is already integrated in the region of the plunger. The plunger is mounted by means of a rod in the housing of the caliper parallel to the axis of rotation of the brake disc. In a particular embodiment, the plunger acts directly with an integrated therein return device for the pressure element, which cooperates with the rod.

Regardless of the case coming to use operating mechanism, as for example in relation to the WO 2004/027281 A1 will be described below, must always be Compensation of the play occurring between the brake disc and the brake pad on the brake pad can be provided by the friction occurring on the brake pad. The brake actuation mechanism has, in the example of a plunger in question here, at least one pressure element which transmits the application force to the brake disk via the brake linings. For this purpose, the pressure element has at least one rotatable element which cooperates with a further element such that both elements can move axially relative to one another, the latter element being guided in the brake caliper in a non-rotatable manner but axially displaceable. According to the WO 2004/059187 A1 it is envisaged for implementing this principle that two sleeve-like spindles are in a threaded engagement, wherein an outer sleeve with an internal thread rotatably receives an inner sleeve with an external thread. The outer sleeve or outer spindle is non-rotatably guided in the caliper or in the carrier, so that a rotation of the inner sleeve or inner spindle leads to a linear displacement of the outer spindle relative thereto, so that the outer spindle on the brake disc to or from this can be moved away to compensate for the wear-related play on the brake pads.

The non-rotatable linear guide of the outer spindle in the axial direction can be realized, for example, in that the outer spindle is directly or via further intermediate components with the brake pad or pad holder in combination, which in turn are linearly guided even in the caliper or in the saddle. In other words, due to the fact that the brake pad (brake pad and pad holder), the pad holder or the brake pad itself are guided in the saddle or in its carrier in the axial direction relative to the brake disc, without being able to rotate, which is with these Brake components associated outer spindle exclusively axially and non-rotatably guided. In this case, usually the connection between the outer spindle, if necessary. Via a pressure plate or the like, and the brake pad or its holder releasably formed to allow a simple change of plaque, as for example the EP 1 832 777 B1 suggests.

Out The described prior art gives rise to the need the different problems and disadvantages occurring therein as possible to eliminate at the same time.

It Therefore, the object of the present invention is a brake mechanism to provide that opposite to the The prior art devices with fewer components gets along and has a lower complexity. In order to A smaller space requirement and a smaller one should go hand in hand Weight. In addition, should the brake mechanism characterized by improved stability and conditional through its incorporation into a caliper housing an improved Allow sealing.

A Still another object is to provide a brake mechanism, which is easy to assemble and whose individual components are lightweight and cost-effective to manufacture.

Solved These tasks are each with a disc brake as claimed 1.

The Invention in each of its embodiments relates to a Disc brake having a caliper, preferably one Sliding saddle, which surrounds at least one brake disc, and further a brake operating mechanism with a reinforcing mechanism for introducing a clamping force, an adjusting device for Compensation of wear of the brake pads with a torque coupling, a pressure element for transmission the application force on the brake disc and a return device wherein the amplifying mechanism, the adjusting device, the pressure element and the return means by means of a mounted in the housing of the caliper in the axial direction Rods are functionally cooperatively mounted in the caliper.

Of the Stab also serves in particular to the individual brake components in the housing of the caliper in such a way and Way to mount them parallel to the axis of rotation of the brake disc Act.

Of the Rod can be designed according to the invention that this immovable in the housing of the caliper, d. H. is not rotatably mounted. Its design and dimensioning is chosen so that the individual brake components in different modular units or the brake actuation mechanism in its entirety as each self-supporting units on the Rod on the one hand and thereby in the housing of the caliper on the other worn and in the brake disc facing away, backward Housing area of the caliper are held.

In the case of a sliding caliper brake, the caliper is arranged to be axially slidable relative to a corresponding axis of the vehicle by means of a carrier fastened to this axle, the carrier having at least two sliding pins. However, three or four sliding pins can be provided so that the sliding saddle in all other directions, but not in the intended direction of sliding, the direction of actuation corresponds, is fixed in its position.

The sliding calliper rests and slides on the slide pins by means of wear-resistant bearing elements provided in the housing of the caliper. For purposes of reducing noise production on the one hand and for purposes of avoiding bearing and guiding problems on the other hand, which could occur as a result of manufacturing tolerances, the bearing elements can be elastically mounted in the caliper. Here, the space surrounding the bearing surfaces is sealed by flexible rubber bellows, end caps, end caps or the like, so that dirt and water can not penetrate, otherwise the frictional resistance would be increased. In the case of the use of end or end caps, these are preferably provided with a vent mechanism for pressure equalization, as this in the German utility model no. 20 2009 003 262 the applicant is described, the disclosure of which is hereby incorporated by reference.

Alternatively, however, it is also possible that the sliding pins are fixed to the caliper, while the elastic sliding bearing elements are arranged on the support of the saddle in a corresponding manner. In both cases, as sliding bearing elements are preferably in the German utility model no. 20 2008 006 779 the plain bearing described in the applicant, the disclosure content of which is hereby incorporated by reference.

The brake pads are slidably mounted on the carrier in a known manner and are for this purpose inserted through a corresponding opening on the upper side of the caliper. The fixation of the brake pads can be accomplished by means of appropriate headband and pad retaining springs with locking devices, as this example in the German utility model no. 20 2008 013 446 the Applicants are described, the disclosure of which is hereby also expressly incorporated by reference.

Of the Brake caliper is preferably made in one piece and includes a housing portion for receiving the brake actuation mechanism and of further brake components and a brake disc and Brake pads cross bridge section. Alternatively, however, it is also conceivable that the housing section and the bridge section represent two separate components, held together by means of bolts or similar fasteners become.

Of the Housing section has two larger main openings on. A rear main opening is used the insertion of a force introduction element of an outside the caliper settled pneumatic, hydraulic or electromechanical actuator. The other main opening opens to the side of the brake disc and serves to receive a brake actuation mechanism and the passage of a pressure element of this brake actuation mechanism at brake application. In addition, you can still several smaller side openings provided in the caliper which are used for purposes of manufacture and assembly, for attaching and operating a reset device for the adjusting device, for sensors of different types Type or similar needed.

In each embodiment of the disc brake according to the Invention has the adjusting device for the clearance a momentary clutch on. This torque coupling is torque controlled and is used for the selective transmission of a direction-dependent Rotation between components of the torque coupling, as follows will be explained in detail.

Preferably the torque coupling is designed as a roller-ramp mechanism, the between the reinforcing mechanism and the pressure element acts, with the rolling elements of the roller-ramp mechanism are arranged coaxially with the rod movable.

With In other words, the rolling elements of the roller ramp mechanism are arranged concentrically around the rod on a circular path and can be on these sections in ramp areas move or roll, which lie on this circular path and in each other formed opposite components of the roller-ramp mechanism are as will be described below.

among them should not be understood solely that the roller-ramp mechanism represents a component that is between the pressure element or parts and the reinforcing mechanism or parts thereof is arranged in a force-transmitting manner. Rather, it closes such an arrangement does not mean that the pressure element or parts thereof directly with the reinforcement mechanism or parts of which can be force-transmitting in connection.

According to the invention, independently of the actual design of the torque coupling, it is provided that the reinforcing mechanism, the adjusting device, the pressure element and the return means on the one hand and the rod on the other side are configured and dimensioned in the axial direction so that in built-in state of the brake actuation mechanism the Restoring device under formation of a defined torque limit for the torque clutch is under bias.

In a further aspect according to the invention, in principle also independent of the actual realization the torque coupling, it is provided that the return device exerts a spring force on the torque coupling in the axial direction.

In the functional initial position of the brake actuation mechanism this spring force acts permanently.

Of the Rod is back in the housing section of the Caliper fixed and thereby sets the return device under a defined bias voltage, wherein the reset device on one side on the torque clutch and on the opposite Side on the serving as an abutment end of the rod in the direction acts on the brake disc. For this purpose, the assembly process according to the invention, which will be described in detail below.

Preferably is the restoring device as an elastic element, preferably designed as a helical spring and is brake disk side in an abutment shell axially fixed at the end of the rod added. That is, the spring is between the abutment shell and the torque clutch clamped under partial compression.

The Size of the thereby adjusting bias arises in this context also from the configuration of Reset device itself; d. H. for example, at a Coil spring from the number of turns that are used Material (spring constant) etc.

The defined bias should according to the invention be chosen so that this one hand for a desired return of the brake actuation mechanism and on the other hand for a desired torque limitation suitable for torque coupling.

The Torque limitation for the torque coupling, for example in the form of the roller-ramp mechanism, should be set so that an applied rotation on at least one of the rotary components the adjusting device is transmitted as long as the Torque required for this transfer is, remains below a value that u. a. by the of the elastic element applied force, d. H. Spring force, determined.

These force- and torque-dependent arrangement therefore determines during the brake actuation stroke the transition from a state in which with little force the clearance is balanced between the brake disc and the brake pad, and a state where the high-force braking contact takes place between the brake disc and the brake pad. The powerful and torque-dependent arrangement of the adjusting responds so that on between the brake disc and the brake pads each during the brake application and the reset predominant clearance and thereby provides an automatic Reconstruction of this clearance sure.

On Reason of the fact that according to the invention the Restoring device on the one hand and the device for torque limitation for the transition between the two previously mentioned phases or states the operating stroke on the other side in a single Component are integrated or summarized, the structure of the Brake actuation mechanism as a whole simplified and by fewer components, the weight, the assembly costs and the associated costs minimized. This also shortens the overall axial length the brake actuating mechanism.

Also regardless of the actual implementation of the torque coupling in a further aspect, the invention relates to a disc brake, in which the adjusting device in the axial direction opposite the reset device on the one hand and opposite the reinforcing mechanism on the other side respectively supported by means of a low-friction bearing element.

The Adjustment comprises, as will be described below should, an adjusting spindle, with the formation of the pressure element with a pressure piece, which interacts with a brake pad, is in a threaded engagement, wherein the pressure piece in the housing of the caliper axially rotatably guided is.

Of the Rotation of these elements counteracts a frictional force, the between components of the brake actuation mechanism as a result of the applied by the restoring device Forms force and transferred via the torque coupling to the adjusting spindle becomes.

According to the Invention, it is therefore intended that the adjusting device by low-friction bearing elements within the brake actuation mechanism namely in the axial direction quasi "embedded" is. The bearing elements can ball, roller or needle roller bearings include.

According to the invention, these are in the brake arranged bearing mechanism outside or adjacent to the actual transmission path for the or the power flow of the brake actuation force. Therefore, they can always be designed so that they do not have to withstand large loads, because due to the construction of the brake actuating mechanism according to the invention, the main power flow runs in braking operation of the reinforcing mechanism directly into the pressure element.

Of Further, the arrangement and structure of the brake operating mechanism according to the invention designed so that next the above areas, except for the contact area between the adjusting spindle and the pressure piece, no further Contact surfaces in the brake actuation mechanism themselves are present, which increased the adjustment process could oppose friction-related resistance.

hereby can during the actuation stroke the area of the transition between the compensation movement for the clearance, for which only a small force is needed, and the introduction of force upon contact of the brake pads with the brake disc during braking, if much higher forces in the brake actuation mechanism act, be specified more precisely or limited, whereby the Accuracy and reliability of wear compensation is improved.

Of the the torque coupling forming roller-ramp mechanism, always between the reinforcing mechanism and the pressure element, is also preferably outside of the power flow of Clamping force arranged. Ideally, the roller-ramp mechanism works in this case with at least one of the aforementioned low-friction bearing elements directly or indirectly together.

For All of the aforementioned embodiments, the Reinforcement mechanism have a lever that is is supported on at least one eccentric bearing extending transversely to the rod, wherein arranged between the lever and the pressure element at least one force transmission element is, by which the clamping force of the lever in the pressure element is initiated.

The eccentric bearing provides the amplification of the force introduced by an actuator and may preferably be realized in a manner as described in the International Patent Application WO 2004/027281 A2 the applicant is described, the disclosure of which is hereby incorporated by reference.

The Pressure element according to the invention, an adjusting spindle have, with a pressure piece, that with a brake pad cooperates, is in a threaded engagement, wherein the pressure piece axially rotatably guided in the housing of the caliper is. Preferably, the adjusting spindle is designed as a hollow spindle, the restoring device and the roller ramp mechanism are arranged inside the hollow spindle. This leaves the axial installation length of the brake actuation mechanism shorten further.

The Adjusting spindle is non-rotatable at its end facing away from the brake disk connected to a gear that is connected to both the at least one Power transmission element as well as with the roller-ramp mechanism interacts. Serve for this purpose connecting means which a plug connection via form a press fit, such as pin rivets. These are preferably arranged on the gear, while in the directed to the gear end face of the adjusting spindle corresponding blind holes are provided.

According to the Invention, the roller-ramp mechanism has a ramp body, which is rotatably connected to the gear, and a bearing ring, wherein the rolling bodies between the ramp body and the bearing ring are mounted freely movable.

Either in the ramp body as well as in the bearing ring are each other opposite on a concentric running around the rod Circular path successively formed a plurality of ramp surfaces, in which the rolling elements are included. In a relative Rotation of the bearing ring to the ramp body run the Rolling body against ramps in the ramp surfaces and may optionally skip to the ramp surface nearest in the direction of rotation. The exact operation of this torque clutch is to be described below in connection with the adjustment of the clearance still be described in more detail.

In In one embodiment, the return device is supported at the brake-disk-side end of the rod in an abutment shell thereby exerting the spring force on the bearing ring, which, as previously explained, a torque limiter realized for the torque coupling.

additionally can between the return device and the bearing ring arranged an outer receiving sleeve be between the bearing ring and the outer Receiving sleeve and between the ramp body and the power transmission element in each case a low-friction Bearing element is arranged.

In a preferred embodiment, the ramp body, the rolling bodies, the La gerring and the outer receiving sleeve an inner receiving sleeve and a hollow shaft coaxial or concentric, wherein the inner receiving sleeve and the hollow shaft are rotatably mounted on the rod.

Prefers are the inner receiving sleeve and the hollow shaft in Axial direction by a freewheel spring, this coaxial on the rod including, wherein the hollow shaft of the lever arranged in rotation displaceable and the inner receiving sleeve is rotatably connected to the bearing ring.

The Gear of the adjusting spindle is with an adjusting gear in Engaging rotatably mounted in the housing of the caliper and rotatable from outside the housing is.

According to the The invention is therefore further a separate return device provided for the adjusting device, with the help of which the adjusting device are brought into a position which can then be a replacement of completely worn out Brake pads allows.

The arranged on one in the housing parallel to the rod Shaft mounted Nachstellzahnrad or pinion meshes with the gear of the adjusting device. At least one end of either conically or cylindrically shaped shaft is designed so that it is with an appropriate tool from the outside through a corresponding opening in the housing of the Caliper can be operated. Alternatively, the Brake disk side end of the shaft also for a tool holder be designed. By simply turning the shaft with the tool is the Nachstellzahnrad and thereby the gear, with the adjusting spindle is also connected, also rotated, causing the adjusting spindle can be moved away from the brake disc. When exchanged Brake pads can rotate by in the opposite Direction the adjusting spindle are returned to their functional starting position.

In a further preferred embodiment, the pressure piece at least one guide rod parallel to the rod outside the power flow of the clamping force in an opening slidably guided in the housing of the caliper is.

Thereby the thrust piece is only axially displaceable, but not rotatably mounted, so that over the threaded engagement with the adjusting spindle whose rotation to a pure translational movement of the pressure piece leads.

As previously explained, is used according to the Invention in particular the rod to the reinforcing mechanism and / or the adjusting device and / or the pressure element and / or the return device as a self-supporting mounting unit to hold together.

The rod essentially provides the support and guidance for the individual components of the brake mechanism. However, with a corresponding weight of the pressure element, it may also be necessary for the pressure element to be provided with additional bearing aids. So it is for example possible to guide the pressure element on the brake pads on bearing surfaces in the carrier or in the saddle, as previously described in connection with the European Patent No. 1,832,777 the applicant was mentioned, the disclosure of which is expressly incorporated herein by reference. Different guide and bearing aids, in particular for the pressure element, can be combined with each other.

In order to in the interior of the adjusting device with the torque coupling no Dirt or water can penetrate, is the brake disk side Closed end of the pressure piece. This can be, for example be realized with a separate lid or the pressure piece itself is completely closed towards the brake disc as an integrally cast or forged component produced. The embodiment with a removable Lid has the advantage that the return spring from the outside is also still available later and for example about a corresponding tool in addition to a desired Preload can be set, even if the entire brake actuation mechanism as a preassembled unit on the rod in housing of the Caliper is mounted.

Coaxial to the rod is further according to the invention a sealing collar provided, extending between the lateral surface the pressure piece and a corresponding radially inner Bearing surface of the housing of the caliper extends. The sealing sleeve can become when moving the pressure piece folded in the axial direction. Both ends of the sealing sleeve can equipped with reinforcements provided with metal inserts be in the appropriate places of the pressure piece on the one side or the housing of the caliper on the other side under clamping action, interference fit, spring action or the like come to the captive plant.

is the front end of the pressure piece is closed, represents the Sealing sleeve the only seal of the brake disc facing opening in the housing of the caliper, which is an intrusion prevents dirt and water from entering the interior, thus protecting the brake actuation mechanism.

The Disc brake in all embodiments described above is particularly suitable for easy installation of the Brake actuation mechanism in the housing of the Caliper, wherein the axial rod plays a significant role.

As previously mentioned, the staff serves to either all components as a single module or multiple components as separate sub-modules, each as a pre-assembled, self-supporting units to hold together, depending on how large the size the caliper predetermined space conditions are, and so these modules in the body of the caliper too Fasten. The separate submodules can then be final assembled inside the body of the caliper become.

Of the Stab therefore serves on the one hand as a guide means and fasteners for the components in the brake application, the Adjustment of the clearance and the return for the disc brake in the assembled state. on the other hand this acts as a mounting bracket in the housing of the Caliper during assembly of the brake actuation mechanism.

According to the Invention may already be a part of the bias by the pre-assembly the adjustment unit, reinforcement mechanism and restoring means on the rod by a corresponding Selection of the axial dimensions of the individual components will be realized. This preload can be achieved by appropriate snap rings or other radial attachment mechanisms maintained on the rod become.

The residual preload, which is the spring force on the torque coupling or defines the torque limit, then becomes final by mounting the unit in the caliper on the return device or spring applied.

The final pretension greater than is the preload generated by the pre-assembly, ultimately Maintain by holding the rod with it on or around it axially fixed brake components in the housing of the caliper through the rear bearing and fastening means, for example, a threaded nut or by two split pin halves, is axially clamped so that the rod can not move axially.

The initial preload is sufficient, the entire braking mechanism with his brake components on the rod to hold. The thus formed self-supporting unit can be easily stored and transported, both what the assembly in the caliper as well as future maintenance work.

After this the final bias has been applied leaves the load on the circlips or other radial attachment mechanisms, with which to maintain the initial bias was, after, since the final bias of the spring directly into the housing of the caliper, which then serves as an abutment acts, is initiated. Because of this fact, it is possible that the adjusting device reset properly This can be done by minimal compression during This assembly step is achieved.

The Invention is basically characterized by the advantage from that for mounting the brake actuation mechanism and its attachment in the caliper next to the rod only very few Fasteners are necessary. The number of parts is thereby in Compared to the prior art lower, thereby increasing the assembly easier, faster and more cost-effective.

About that In addition, very many standard parts and rotationally symmetric Components are used, their production is also essential is easier.

Of the Brake actuation mechanism according to the Invention is further characterized by its compactness all in the axial direction while still flawless reliability out, so that also the length of the caliper, accompanying with a weight reduction, can be shortened. Of the specific construction of the brake operating mechanism according to the The invention can be moved and handled as a unit.

Further Advantages and features of the present invention will become apparent the embodiments illustrated below with reference to the accompanying drawings. Show it

1 an exploded view of the essential components of the disc brake according to the present invention;

2 a plan view, partially in section, the disc brake in the assembled state;

3 a side sectional view of the disc brake in the assembled state;

4 an exploded view of the brake actuation mechanism according to the invention with its individual components;

5 an enlarged section 2 for illustrating the brake operating mechanism;

6 an enlarged section 3 for illustrating the brake operating mechanism; and

7 a side view of a brake actuation mechanism in a further embodiment according to the invention.

In 1 is the disc brake according to the invention in an exploded view with its essential components shown in the 2 and 3 are each represented in their assembled state.

The disc brake has a caliper 1 on that on a support 2 is guided in a sliding manner. This is the caliper 1 by means of plain bearings 3 on the carrier 2 guided.

The plain bearings 3 are by means of bolts 4 on the carrier 2 fixed and corresponding in openings 5 in the housing of the caliper 1 added. Between the plain bearing 3 and the inner wall of the openings 5 are elastic plain bearing elements 6 provided, as this example, in the German utility model no. 20 2008 006 779 the applicant are described.

To ensure proper functioning of the thus formed plain bearing mechanism, the openings 5 in the caliper 1 to the outside by means of end caps 7 sealed, as this example, in the German utility model no. 20 2009 003 262 the applicant are described.

The caliper 1 over or encompasses brake pads 8th that rest on pad holders 9 are attached. The pad holders 9 with the brake pads arranged thereon 8th are in appropriate guides 10 of the carrier 2 axially guided. The pad holders 9 be by pad retaining springs 11 shake-proof clamped, this is on a headband 12 support, which has an upward opening 13 in the housing of the caliper 1 spans, through which the brake pads 8th with their pad holders 9 can be inserted and removed for assembly purposes. On its two sides under or behind the handlebar 12 corresponding to the caliper 1 molded or formed projections or recesses 14 so that the headband 12 can not escape to the top and so an abutment for the pad retaining springs 11 to be able to form.

A displacement in the longitudinal direction of the retaining clip 12 is prevented by this on one side with a locking device designed as a spring 15 works together, in turn, with the caliper 1 is strained, as in the example German utility model no. 20 2008 013 446 the applicant is described.

The two brake pads 8th Grasp a brake disc not shown here, which is mounted on a corresponding hub or connected to the hub part of a wheel axle.

Like in the 1 can be seen, the caliper points 1 brake disc facing an opening 16 through which a brake actuation mechanism 17 can act on the brake disc and through which, as further below in connection with the 11 to 22 is described, the brake actuation mechanism 17 , depending on the embodiment, in different modules in the housing of the caliper 1 is mounted.

4 shows in an exploded view of the brake actuation mechanism 17 in its parts, while the 5 to 7 this in its functional mounting position in the housing of the caliper 1 represent.

The brake actuation mechanism 17 According to the invention is designed such that on the one hand a simple assembly in the caliper 1 allowed and on the other hand by the special arrangement of the individual parts to each other a proper operation with a compact design allows.

According to the invention, there is the brake actuation mechanism 17 essentially a reinforcing mechanism 18 that the actuator force originating from a hydraulic, pneumatic or electromechanical (or a combination of these types) actuator (not shown here) as a clamping force in the brake actuation mechanism 17 initiates and thereby amplified according to a design-dictated transmission ratio, from an adjuster 19 , which serves to compensate for brake pad wear, from a pressure element 20 , which transmits the increased application force to the brake disc, and from a restoring device 21 to the brake actuation mechanism 17 to reset to its initial position when no braking force across the actuator, located outside the housing of the caliper 1 is located, has more effect.

An essential feature of the disc brake according to the invention here is that the aforementioned assemblies on a central rod 22 are arranged, which is aligned coaxially with the axis of the brake disc.

The rod 22 serves, as will become apparent from the following description, as a mounting means for the individual components of the brake actuation mechanism on the one hand and as a fastening means for this in the housing of the caliper 1 on the other hand.

The reinforcement mechanism 18 has a lever 23 on, at the top, an opening 24 in the caliper 1 sweeping end 25 a transmission means, not shown here, of the actuator, for example a rod of a pneumatic cylinder, acts. The lever 23 is in a rear housing portion of the caliper 1 pivotally mounted by this on two eccentric rollers 26 rotatably supported. The cylindrical eccentric rollers 26 are in a corresponding, in two cups 27 arranged needle roller cage 28 rotatably received, with the bearing shells 27 in the rear housing portion of the caliper 1 support.

The lever 23 is relative to the eccentric rollers 26 designed and designed, which is a pivoting movement about the eccentric rollers 26 an eccentric displacement of the lever 23 to the eccentric rollers 26 adjusts the gain of the actuator in the lever 23 initiated force leads. For the exact design and operation of the Exzenterlagerung the lever 23 This is intended to refer to the disclosure of International Patent Application No. 2004/027281 A2 the applicant are referred to, the disclosure of which is hereby incorporated by reference.

The eccentric rollers 26 opposite, the lever is supported 23 over further needle bearing shells 29 on a power transmission element 30 from. The power transmission element 30 is integrally, preferably as a cast or forged, constructed and has lever side two approximately half-shell-like recesses 31 on, that of receiving the needle bearing cups 29 serve. Brake disk side is the power transmission element 30 formed with planar surfaces to, as will be described below, with the adjusting device 19 and thereby with the pressure element 20 to work together.

For the penetration of the central rod 22 points the lever 23 an opening 32 , the needle bearing cage 28 an opening 33 and the power transmission element 30 an opening 34 on while the cups are in place 27 , the eccentric rollers 26 and the needle bearing shells 29 on either side of the staff 23 are arranged in appropriate places.

Immediately following the reinforcement mechanism 18 Towards the brake disc, the adjuster closes 19 at.

The adjusting device 19 includes a torque coupling whose operation is explained below. The torque coupling is called a roller-ramp mechanism 35 formed, whose items are best in the 6 you can see.

The roller-ramp mechanism 35 has a ramp body 36 on, on its side facing away from the brake disc with a gear 37 rotatably connected. The function of the gear 37 will be explained in more detail below.

The ramp body 36 opposite is a bearing ring 38 intended. The bearing ring 38 and the ramp body 36 close several rolling bodies 39 one in a roll cage 40 guided and coaxial around the bar 22 movable between the bearing ring 38 and the ramp body 36 are arranged.

The rolling bodies 39 are each in ramp areas 41 taken up, which are opposite each other in the bearing ring 38 on one side and the ramp body 36 on the other side are trained. A ramp surface 41 each goes to the following ramp area 41 over, with all ramp surfaces 41 on a closed circular path around the staff 22 lie. In 4 These are ramp areas 41 only for the bearing ring 38 recognizable. This can be any ramp surface 41 each be divided into different sections having different pitch angles. The pitch angle can be chosen so that it is better to tune the limiting torque for the torque clutch when interacting with the bias.

The ramp body 36 is supported against the power transmission element 30 by at least one low-friction bearing element 42 in a cylindrical recess 43 in the brake disc facing side of the power transmission element 30 is provided.

In an analogous manner, the bearing ring is supported 38 via another low-friction bearing element 44 on an outer receiving sleeve 45 from.

The outer receiving sleeve 45 and partly the bearing ring 38 Coaxially close an inner receiving sleeve 46 and partly the bearing ring 38 and the ramp body 36 with the rolling elements 39 between close coaxially a hollow shaft 47 one.

The inner receiving sleeve 46 and the hollow shaft 47 engage each other at their ends and are on the central rod 22 rotatably mounted, wherein the inner receiving sleeve 46 on the bar 22 axially by a snap ring 48 is fixed.

The hollow shaft 47 and the inner receiving sleeve 46 in turn coaxial with a freewheel spring 49 a, wherein the radial outer surface of the freewheeling spring 49 each with the radial inner surfaces of the hollow shaft 47 and the inner receiving sleeve 46 is in communication, so that these two elements can be connected non-rotatably when needed.

The inner receiving sleeve 46 is about a gearing 50 with the bearing ring 38 rotatably connected. In addition, the teeth in this case have interposed roller bearings or rollers to a roller guide between the inner receiving sleeve 46 and the bearing ring 38 form, which inherits a very low friction in the axial direction.

The hollow shaft 47 again has a peg-like element 51 on, with the lever 23 communicates, wherein this connection is designed so that when a pivoting movement of the lever 23 over the peg-like element 51 the hollow shaft 47 is put into a rotary motion. The hollow shaft 47 completely penetrates the power transmission element 30 ,

It can be seen in the figures that all components of the adjusting device 19 formed as a substantially rotationally symmetrical body and coaxially around the rod 22 are arranged.

The adjusting device 19 enclosing is the pressure element 20 provided, which is also coaxial with the rod 22 is arranged.

The pressure element 20 has a hollow adjusting spindle 52 on, the outside with a pressure piece 53 via a corresponding thread 54 engaged. The pressure piece 53 spreads to the brake disc for reasons of better power distribution trapezoidal and is via appropriate fasteners, such as a pin-groove connection 55 , on the pad holder 9 of the inner brake pad 8th attached, like this one from the 2 is apparent.

The adjusting spindle 52 is on its disc side facing away from the gear wheel 37 the adjusting device 19 via corresponding connecting elements 56 rotatably connected, for example by pin rivets 56 that in corresponding blind holes 57 in the front of the adjusting spindle 52 form a press fit.

The gear 37 again stands with the ramp body 36 via a wedge and groove connection 58 in a non-rotatable connection.

This will cause a rotational movement of the ramp body 36 indirectly on the adjusting spindle 52 transfer.

On the outside is on the pressure piece 53 a sealing collar 59 arranged the space between the pressure piece 53 and the respective inner wall of the housing of the caliper 1 seals against the brake disc to prevent the ingress of moisture and dirt into the interior of the caliper 1 exclude, so that the functional safety of the brake actuation mechanism 17 is ensured at all times.

The sealing cuff 59 is elastically unrolling in the axial direction and has at their ends in each case, optionally resilient, metal inserts 60 on which a perfect press fit to the respective contact surfaces in the housing of the caliper 1 provide.

The pressure piece 53 further comprises at least one guide element, for example a guide rod 61 on that in a corresponding opening in the caliper 1 is included. This will ensure that the pressure piece 53 relative to the caliper 1 rotatably guided and a rotational movement of the adjusting spindle 52 in an axial longitudinal movement of the pressure piece 53 is translated.

The adjusting spindle 52 not only closes the adjuster 19 , but also the reset device 21 coaxial.

The reset device 21 closes in the axial direction to the brake disc back to the adjusting device 19 and is also coaxial with the rod 22 arranged.

This consists of a coil spring 63 , the brake disc side to an abutment shell 64 supported. The abutment shell 64 is at the brake-disk-side end of the rod 22 via a spacer ring 65 and a snap ring 66 axially positioned and fastened.

On its opposite side, the coil spring is supported 63 on the outer receiving sleeve 45 the adjusting device 19 from. In this way, the return device 21 at the same time as a mechanism for applying a torque limiter to the adjuster 19 as described below in connection with the description of the operation of the adjuster 19 and the brake operating mechanism 17 still to be explained.

In 7 is an alternative embodiment of the return device 21 shown.

Also in this relies a coil spring 63 on an abutment shell 64 from. The abutment shell 64 However, this is done axially on the rod 22 by means of a threaded nut 67 set on a brake-disk-side thread 68 on the staff 22 is screwed on. By targeted twisting of the threaded nut 67 relative to the rod 22 can have a defined preload on the coil spring 63 be applied.

In addition, in this embodiment, between the outer receiving sleeve 45 and the low-friction bearing element 44 another guide ring 69 intended. The guide ring 69 supports the positioning as well as the axial and radial guidance of the guide ring 69 neighboring components relative to each other.

The low-friction bearing element 44 Among other things, it serves to eliminate the risk that, especially when releasing the brake, a slight winding of the coil spring 63 the adjustment function is affected.

Like in the 5 to recognize so, the gear meshes 37 the adjusting device 19 with an adjusting gear 70 that is on an axle in the body of the caliper 1 is stored parallel to the rod 22 runs.

The axle is driven by an adjusting shaft or an axle body 71 formed, which has a corresponding toothing and with its free end 72 in one in the housing of the caliper 1 provided storage bag hole 73 and with its opposite end 74 in an externally accessible opening 75 in the caliper 1 is stored. The axle body 71 becomes like a plug in the opening 75 inserted, however, such tolerances are provided that the axle body 71 from a certain torque in the opening 75 can be turned. This is the end of this 74 of the axle body 71 a version 76 on, which serves to receive a tool, with the help of which of the axle body 71 , so that the Nachstellzahnrad 70 and in turn the gear 37 with the adjusting spindle 52 can be set in rotation, as will be explained below under.

The opening 75 is by a correspondingly shaped cap 77 From the outside tightly closed.

The housing of the caliper 1 has yet another lateral mounting opening 78 on, in axial extension to the axis of rotation of the eccentric rollers 26 is provided.

Through this opening 78 can the mounting and alignment of the bearing shells 27 and the needle bearing cage 28 and the eccentric rollers 26 be accomplished and supported. In addition, leave them over the opening 78 the bearing surfaces inside the housing of the caliper 1 machine.

The mounting hole 78 is also by a sealing plug 79 closable. Transverse to the axial direction, ie laterally outward, are the eccentric rollers 26 by on the lever 23 protruding edges 80 guided and positioned. On the opposite sides are the eccentric rollers 26 through a spacer sleeve 81 , the quasi inner side storage areas 82 for both eccentric rollers 26 provides, from the bar 22 separated.

The position of the spacer sleeve 81 is in the axial direction on one side by a spring washer 84 and on the opposite side by abutment with the hollow shaft 47 established.

The rod 22 has at its rear, brake disc facing away from a thread 85 on. This thread 85 is in the assembled state outside the housing of the caliper 1 because the rod 22 an opening 86 in the caliper 1 be upheld.

The opening 86 widens conically and serves with intermediate storage of a sealing ring 87 the inclusion of a wedge ring 88 ,

During assembly, the wedge ring 88 by means of one on the thread 85 screw-on fixing nut 89 in the opening 86 braced. The fastening nut 89 is still from an end cap 90 overlapped.

As can be seen in the figures, the rod points 22 a corresponding contouring with different diameters and groove arrangements in order to provide the bearing surfaces and mounting means for the axial positioning of the above-described individual components.

It is an essential aspect of the invention that the rod 22 on the one hand and the individual on this stored components of the reinforcement mechanism 18 , the adjuster 19 and the reset device 21 on the other side in the axial direction are dimensioned and designed so that in the installed, strained in the rear part of the caliper state of the rod 22 the coil spring 63 a defined torque limit over a then formed permanent bias on the in the adjustment 19 in the form of a roller-ramp mechanism 35 present torque coupling exercises.

This torque limit will also through the corresponding assembly steps of the brake actuation mechanism 17 realized.

The operation of the brake actuating mechanism according to the invention 17 with the adjusting device 19 is as follows.

When a force is applied by the actuator, the lever pivots 23 around the eccentric rollers 26 and offset over the peg-like element 51 the hollow shaft 47 in rotation. This is indicated by the lever 23 a recess or groove 51A on, as for example in the 5 can be seen.

If still no contact with the brake pad 8th and the brake disc is made and consequently no braking force is transmitted, locks the freewheel spring 49 the hollow shaft 47 with the inner receiving sleeve 46 so that both turn together. Because the inner receiving sleeve 46 about the gearing 50 rotatably with the bearing ring 38 connected, this bearing ring turns 38 accordingly with.

Due to the coil spring 63 exerted spring force that provides the defined torque limit rotates the bearing ring 38 also the ramp body 36 and that with this over the wedge-groove connection 58 rotatably connected gear 37 and ultimately the adjuster spindle 52 , The rolling bodies 39 remain stationary in the in the ramp body 36 on one side and in the bearing ring 38 trained ramp surfaces 41 (please refer 4 ). The ramp surfaces 41 are formed continuously circular as merging ramps, so that in each case a rolling body 39 if necessary in the next ramp area 41 can skip.

Because the pressure piece 53 in the housing of the caliper 1 over the guide rod 61 is guided exclusively axially and therefore can not rotate, causes a rotation of the adjusting spindle 52 an axial displacement of the pressure piece 53 , As a result, the clearance is bridged.

Now comes during braking the brake pad 8th With the brake disc in contact, forms a closed power flow with a corresponding counterforce to the introduced force. With increasing force in the axial direction, there is a point where this is due to the friction in the thread 54 conditional torque between the pressure piece 53 and the adjusting spindle 52 will be larger than that by the coil spring 63 Torque limiting torque induced in the torque clutch. As a result, the adjusting spindle remain 52 and the gear 37 and thus the ramp body 36 stand.

At this moment, however, turn the hollow shaft 47 , the inner receiving sleeve 46 and the bearing ring 38 further, which causes the rolling bodies 39 no longer stationary, but in the ramp areas 41 of the ramp body 36 move on and against these ramp surfaces 41 accrues.

Because the ramp body 36 opposite the power transmission element 30 via a low-friction bearing element 42 supported, causes the emergence of the rolling body 39 that the bearing ring 38 from the ramp body 36 towards the brake disc to move away and so the coil spring 63 compressed. This compression takes place during the entire Bremsbetätigungshubs and forms quasi the elastic portion for the subsequent return movement.

If the actuator no longer directs power into the brake actuation mechanism 17 a, which begins by the restoring device 21 supported return movement.

Initially, there is still a contact between the brake pad 8th and the brake disc, which still affect considerable forces. The individual components gear 37 , Ramp body 36 and bearing ring 38 with the rolling elements 39 in between and the hollow shaft 47 then turn in the reverse direction until they resume their original angular position at the beginning of braking. These components consequently reverse their movements during the braking stroke in accordance with the aforementioned elastic portion.

If there is no abrasion on the brake lining during the braking stroke 8th occurred and therefore no wear on the brake pad 8th is present, ends a force-conducting contact between the brake pads 8th and the brake disc exactly at the time when the components gear 37 , Ramp body 36 , Bearing ring 38 and hollow shaft 47 take their starting angle position again. These components then remain in their position until the pin-like element 51 during the pivotal movement of the lever 23 in the reverse pivoting direction on the opposite stop surface of the connecting groove or recess 51A of the lever 23 in which the peg-like element 51 is guided, comes to the concern. Then, by the reverse pivotal movement of the lever 23 the hollow shaft 47 actively further rotated in the reverse direction, while due to the freewheeling spring 49 the inner receiving sleeve 46 and the bearing ring 38 stay standing. In this phase slips the freewheel spring 49 then by such an angle, which corresponds to the adjustment of the clearance during the brake stroke.

The recess 51A of the lever 23 is slightly larger than the thickness of the peg-like element to form a game 51 , This game corresponds to the clearance between the brake pad 8th and the brake disc, which is never adjusted for purposes of functional safety.

If, on the other hand, there is wear on the brake pad after the brake stroke 8th Before, for example, after a strong emergency braking, lifts the force-conducting contact between the brake pads 8th and the brake disc on before the gear components 37 , Ramp body 36 and bearing ring 38 with the rolling elements 39 in between their starting angle position could take again.

At this time, caused by the coil spring 63 in the axial direction on the torque coupling force exerted that the gear 37 and thus the adjusting spindle 52 sets in rotation, whereby the wear is compensated. The further movement sequence of the individual components is then the same as for the case described above without wear.

The adjustment during the release of the brake or the provision of the pressure piece 53 and the reverse pivotal movement of the lever 23 is also the result of low internal friction and the resulting low hysteresis of the roller-ramp mechanism 35 , For these reasons, according to the invention, a roller-ramp mechanism is preferably used as a torque coupling, since it allows the exact determination of a torque for torque limiting at low production costs.

1

caliper

2

carrier

3

bearings

4

bolt

5

openings

6

plain bearing elements

7

endcaps

8th

Brake pads

9

pad holders

10

guides

11

Pad retainer springs

12

headband

13

opening

14

Projections / recesses

15

locking device

16

opening

17

Brake actuating mechanism

18

strengthening mechanism

19

readjustment

20

pressure element

21

Reset device

22

Rod

23

lever

24

opening

25

The End lever

26

eccentric rollers

27

bearings

28

Needle bearing cage

29

Needle bearings

30

Power transmission element

31

recesses

32

opening

33

opening

34

opening

35

Roller ramp mechanism

36

ramp body

37

gear

38

bearing ring

39

roll body

40

roll cage

41

ramped surfaces

42

Friktionsarmes bearing element

43

recess

44

Friktionsarmes bearing element

45

Outer receiving sleeve

46

Inner receiving sleeve

47

hollow shaft

48

snap ring

49

Freewheel spring

50

gearing

51

Zapf-like element

51A

recess lever

52

Cave adjusting spindle

53

Pressure piece

54

thread

55

Pin-groove connection

56

fasteners

57

blind holes

58

Wedge groove connection

59

sealing sleeve

60

metal inserts

61

guide rod

63

coil spring

64

Abutment shell

65

spacer ring

66

snap ring

67

threaded nut

68

thread

69

guide ring

70

adjustment gear

71

axle body

72

Free The End

73

Bearing blind hole

74

The End

75

opening

76

version

77

cap

78

mounting hole

79

plug

80

edge lever

81

spacer

82

storage area

83

84

spring washer

85

thread

86

opening

87

seal

88

Keilsplinte / wedge ring

89

fixing nut

90

endcap

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• EP 0271864 B1 [0004]
• EP 0553105 B1 [0005]
• - EP 0698749 B1 [0006]
• WO 01/75324 A1 [0007]
• WO 2004/059187 A1 [0008, 0009]
• - WO 2004/027281 A1 [0009]
• EP 1832777 B1 [0010]
• - DE 202009003262 U [0019, 0088]
• - DE 202008006779 U [0020, 0087]
• - DE 202008013446 U [0021, 0090]
• WO 2004/027281 A2 [0047, 0099]
• EP 1832777 [0062]

Claims (19)

Disc brake having a caliper ( 1 ), which surrounds at least one brake disc, and a brake actuation mechanism ( 17 ) with - a reinforcing mechanism ( 18 ) for introducing a clamping force, - an adjusting device ( 19 ) to compensate for a lining wear with a torque coupling, - a pressure element ( 20 ) for transmitting the application force to the brake disk, and - a restoring device ( 21 ), wherein the reinforcing mechanism ( 18 ), the adjusting device ( 19 ), the pressure element ( 20 ) and the reset device ( 21 ) by means of a in the housing of the caliper ( 1 ) in the axial direction immovably mounted rod ( 22 ) functionally cooperating in the caliper ( 1 ) are mounted, characterized in that the reinforcing mechanism ( 18 ), the adjusting device ( 19 ), the pressure element ( 20 ) and the reset device ( 21 ) on one side and the rod ( 22 ) are configured on the other side and dimensioned in the axial direction so that in the installed state of the brake actuation mechanism ( 17 ) the reset device ( 21 ) is biased to form a defined torque limit for the torque coupling. Disc brake according to Claim 1, in which the restoring device ( 21 ) exerts a spring force on the torque coupling in the axial direction. Disc brake according to Claim 1 or 2, in which the adjusting device ( 19 ) in the axial direction with respect to the restoring device ( 21 ) on the one side and the reinforcing mechanism ( 18 ) on the other side in each case by means of a low-friction bearing element ( 42 ; 44 ) is supported. Disc brake according to claim 1, 2 or 3, in which the torque coupling is used as a roller-ramp mechanism ( 35 ) formed between the reinforcing mechanism ( 18 ) and the pressure element ( 20 ), whereby the rolling bodies ( 39 ) of the roller-ramp mechanism ( 35 ) coaxial with the rod ( 22 ) are movably arranged. Disc brake according to Claim 1 or 4, in which the roller-ramp mechanism ( 35 ) is arranged outside the power flow of the application force. Disc brake according to Claim 5, in which the roller-ramp mechanism ( 35 ) with at least one low-friction bearing element ( 42 ; 44 ) cooperates. Disc brake according to one of the preceding claims, in which the reinforcement mechanism ( 18 ) a lever ( 23 ) located on at least one transverse to the rod ( 22 ) extending eccentric bearing ( 26 ), wherein between the lever ( 23 ) and the pressure element ( 20 ) at least one force transmission element ( 30 ) is arranged, through which the clamping force of the lever ( 23 ) in the pressure element ( 20 ) is initiated. Disc brake according to Claim 7, in which the pressure element ( 20 ) an adjusting spindle ( 52 ), which with a pressure piece ( 53 ) fitted with a brake pad ( 8th ) cooperates, in threaded engagement, wherein the pressure piece ( 53 ) in the housing of the caliper ( 1 ) is guided axially rotatably. Disc brake according to Claim 8, in which the adjusting spindle ( 52 ) is designed as a hollow spindle, wherein the restoring device ( 21 ) and the roller ramp mechanism ( 35 ) inside the hollow spindle ( 52 ) are arranged. Disc brake according to claim 8 or 9, in which the adjusting spindle ( 52 ) rotatably on its brake disc facing away with a gear ( 37 ) connected to both the at least one power transmission element ( 30 ) as well as with the roller-ramp mechanism ( 35 ) cooperates. Disc brake according to one of Claims 4 to 10, in which the roller-ramp mechanism ( 35 ) a ramp body ( 36 ), which with the gear ( 37 ) is rotatably connected, and a bearing ring ( 38 ), and the rolling bodies ( 39 ) between the ramp body ( 36 ) and the bearing ring ( 38 ) are mounted freely movable. Disc brake according to Claim 11, in which the restoring device ( 21 ) at the brake-disk-side end of the rod ( 22 ) on an abutment shell ( 64 ) and thereby on the bearing ring ( 38 ) exerts a spring force. Disc brake according to claim 12, in which between the resetting device ( 21 ) and the bearing ring ( 38 ) an outer receiving sleeve ( 45 ) is arranged. Disc brake according to claim 13, wherein between the bearing ring ( 38 ) and the outer receiving sleeve ( 45 ) and between the ramp body ( 36 ) and the power transmission element ( 30 ) each have a low-friction bearing element ( 44 ; 42 ) is arranged. Disc brake according to Claim 13 or 14, in which the ramp body ( 36 ), the rolling bodies ( 39 ), the bearing ring ( 38 ) and the outer receiving sleeve ( 45 ) an inner receiving sleeve ( 46 ) and a Hollow shaft ( 47 ) coaxially, wherein the inner receiving sleeve ( 46 ) and the hollow shaft ( 47 ) on the rod ( 22 ) are rotatably arranged. Disc brake according to Claim 15, in which the inner receiving sleeve ( 46 ) and the hollow shaft ( 47 ) in the axial direction by a freewheeling spring ( 49 ), these on the rod ( 22 ) are coaxially included, wherein the hollow shaft ( 47 ) from the lever ( 23 ) arranged in rotation displaceable and the inner receiving sleeve ( 46 ) with the bearing ring ( 38 ) is rotatably connected. Disc brake according to one of Claims 11 to 16, in which the toothed wheel ( 37 ) with an adjusting gear ( 70 ) engaged in the housing of the caliper ( 1 ) is rotatably mounted and can be set from outside the housing in rotation. Disc brake according to one of claims 9 to 17, in which the pressure piece ( 53 ) at least one guide rod ( 61 ) parallel to the rod ( 22 ) outside the force flow of the clamping force in an opening ( 62 ) in the housing of the caliper ( 61 ) is guided in a sliding manner. Disc brake according to one of the preceding claims, in which the rod ( 22 ) the reinforcing mechanism ( 18 ) and / or the adjusting device ( 19 ) and / or the printing element ( 20 ) and / or the resetting device ( 21 ) holds together as a self-supporting mounting unit.