DE202017002779U1 - Disc brake and brake actuation mechanism - Google Patents

Abstract

A brake actuation mechanism for a disc brake - comprising: an amplifying mechanism (A) for applying a application force to a pressure member (C) which transmits the application force to the brake disc; - wherein the pressure element (C) has a Nachtstellspindel (20) which is in threaded engagement with a pressure piece (23) which cooperates with a brake pad, so that a rotation of the adjusting spindle (20) to an axial displacement of the pressure piece (23 ) leads; - With an adjusting device (B) which is designed to enable the adjusting spindle (20) during an operating state of the disc brake to compensate for a lining wear in rotation; and - a drive member (41) configured to rotate the adjusting spindle (20) when needed outside of an operating state of the disc brake; characterized in that the drive element (41) is decoupled from the power flow of the application force by the brake actuation mechanism.

Description

The present invention relates to a brake actuation mechanism for a disc brake and a disc brake, in particular for commercial vehicles, having such a brake actuation mechanism.

In this case, the invention comprises disc brakes which have either a sliding caliper or a fixed caliper, and which engage over one or more brake discs. The invention relates primarily, but not exclusively, to partially coated disc brakes.

Disc brakes, especially for heavy trucks, are known in a variety of embodiments, both in terms of the type of brake actuation mechanism, the manner of transmitting the braking force to one or more discs and the nature of the adjustment to compensate for wear of the brake pads.

A particular embodiment of a brake actuator used in disc brakes is, for example, International Application WO 2011/113554 A2 the applicant known. The known from this application brake actuation mechanism is characterized by an extremely compact design, which is associated with a smaller footprint in the housing of the caliper and with a lower weight. All components of this brake actuating mechanism are functionally cooperatively mounted in the caliper by means of a rod mounted in the housing of the caliper in the axial direction so as to act in parallel with the axis of rotation of the brake disc. As a result of a displacement movement of the reinforcing mechanism performs a pressure element together with an adjusting a translational movement in the direction of the brake disc to transmit the clamping force.

The adjusting device for the compensation of wear has a torque clutch, which is torque-controlled and the selective transmission of a rotational direction-dependent rotation between components of the torque clutch is used. In addition, the adjusting device still has a one-way clutch, in which two rotatably mounted on the rod elements, an inner receiving sleeve and a hollow shaft are interconnected by means of a freewheeling spring, wherein the one-way clutch is designed so that it during a brake actuation rotational movement between the transmits both elements while slipping on brake release.

For exact operation in terms of delivery and transmission of the braking force and the readjustment in the known from the prior art brake actuation mechanism is hereby expressly to the disclosure of the WO 2011/113554 A2 directed. Other, similarly designed brake actuation mechanisms are for example from the WO 2013/083857 A2 , of the WO 2014/106672 A2 or the WO 2015/140225 A2 the applicant, to which also incorporated herein by reference.

At a change of worn brake pads at least the adjustment of the brake actuation mechanism, but usually the entire mechanism must be reset to disassemble or decouple the brake pads or brake pad holder plates of the pressure element of the pressure element.

For this purpose, a gear is provided in the prior art, which is arranged on the brake disc side facing away radially on the outside of the adjusting spindle and connected to this torque transmitting. The gear is rotated by a separate actuatable from outside the caliper mechanism in order to move the adjusting spindle back, so to draw into the interior of the housing of the caliper. In this context, let me give an example to the illustrations of the 5 and 11 and the associated points of description of the above-mentioned WO 2011/113554 A2 directed.

In the different embodiments of the prior art described above, the gear is in an immediate, the clamping force transmitted contact with a bearing seat body of the lever, so that the clamping force is introduced via the gear axially into the adjusting spindle.

Based on this, the invention has the object to provide a further developed brake actuation mechanism in which the gear for the provision of the adjusting device is decoupled in the operating state from the power flow of the clamping force for purposes of pad replacement. In addition, an object is to provide a disc brake in which such brake actuation mechanisms are used.

These objects are achieved with a brake actuation mechanism according to claim 1 and with a disc brake having such a brake actuation mechanism according to claim 9.

• – einen Verstärkungsmechanismus zum Einleiten einer Zuspannkraft in ein Druckelement, das die Zuspannkraft auf die Bremsscheibe überträgt;
• – wobei das Druckelement eine Nachtstellspindel aufweist, die mit einem Druckstück, das mit einem Bremsbelag zusammenwirkt, in einem Gewindeeingriff steht, so dass eine Drehung der Nachstellspindel zu einer axialen Verschiebung des Druckstücks führt;
• – eine Nachstelleinrichtung, die ausgestaltet ist, während eines Betriebszustands der Scheibenbremse die Nachstellspindel zum Ausgleich eines Belagverschleißes in Drehung zu versetzen; und
• – ein Antriebselement, das ausgestaltet ist, außerhalb eines Betriebszustands der Scheibenbremse die Nachstellspindel bei Bedarf in Drehung zu versetzen;

wobei das Antriebselement vom Kraftfluss der Zuspannkraft durch den Bremsbetätigungsmechanismus entkoppelt ist. The gist of the present invention is to provide a brake actuation mechanism for a disc brake which comprises:

• - A reinforcing mechanism for introducing a clamping force in a pressure element which transmits the application force to the brake disc;
• - wherein the pressure element comprises a Nachstellspindel which is in threaded engagement with a pressure piece, which cooperates with a brake pad, so that a rotation of the adjusting spindle leads to an axial displacement of the pressure piece;
• - an adjusting device, which is designed to enable the adjusting spindle to compensate for a lining wear during an operating state of the disc brake in rotation; and
• A drive element configured to cause the adjustment spindle to rotate as needed outside an operating state of the disc brake;

wherein the drive element is decoupled from the power flow of the application force by the brake actuation mechanism.

Outside of an operating state includes all circumstances in which the vehicle and thus the disc brakes of a maintenance, service or inspection are subjected.

The drive element is preferably designed as a gear which is arranged radially on the outside of the adjusting spindle.

Due to the fact that the gear during operation of the disc brake is not arranged within the force flow of the application force during brake operation, it can be made lighter overall or made of a less resistant material. At the same time, this allows individual components of the brake actuation mechanism and thus the entire brake actuation mechanism to be stiffer for the purpose of power transmission.

In one embodiment, the gear is received in an annular groove of the adjusting spindle.

In a preferred embodiment, the gear has a means which enters into a torque-transmitting connection with a complementary means of the adjusting spindle. Preferably, this means is formed as a radially inwardly directed projection which engages in a shape-complementary recess which is directed radially inwardly on an end side of the adjusting spindle.

Furthermore, the gear may preferably be divided in the radial direction in the region of the projection. The division allows easier mounting of the gear in the annular groove of the adjusting spindle, since the ring of the gear can be easily pulled apart.

For purposes of initiation of the application force of the reinforcing mechanism directly into the adjusting spindle, this frontally may have a radially inwardly and coaxially outwardly stepped ring, which cooperates with a shape-complementary recess of the reinforcing mechanism. In the ring itself a plurality of recesses may be provided radially inwardly, which are designed to enter into a torque-transmitting and axially displaceable connection with corresponding projections of an output element of the adjusting device.

The invention also relates to a disc brake having a brake actuation mechanism according to at least one of the above-described embodiments. In particular, the invention relates to a disc brake in which a brake actuation mechanism according to at least one of the above-described embodiments by a rod in a housing of a brake caliper of the disc brake is mounted at least in modules or in total as a self-supporting unit.

Further advantages and features of the invention will become apparent from the following description of the embodiments illustrated with reference to the drawings. Show it

1 a lateral longitudinal section in the axial direction of a brake actuation mechanism according to the invention;

2a an exploded view of a part of the brake actuating mechanism;

2 B an exploded view of another part of the brake actuating mechanism;

3a a cross section along LL 1 ;

3b a cross section along SS 1 ;

4 a perspective view of only one adjusting spindle of an adjusting device with a gear;

5 a front view of the adjusting spindle with the gear; and

6 an axial cross section through the adjusting spindle with the gear.

The 1 to 3b generally show all components of a brake actuation mechanism according to the invention. For the exact installation position of such a brake actuation mechanism according to the invention in a housing of a caliper is intended to be exemplary of the WO 2011/113554 A2 the applicant are referred to, the disclosure of which is hereby incorporated by reference.

The brake actuating mechanism according to the invention consists essentially of four modules which functionally cooperate, namely a reinforcing mechanism A, an adjusting device B, a pressure element C and a return device D, wherein the brake actuating mechanism acts as a self-supporting unit by means of a centrally located rod 1 can be mounted on this itself and thereby in a housing of the caliper.

The reinforcing mechanism A serves to introduce an actuating force from a hydraulic, pneumatic or electromechanical actuator (not shown) as a clamping force into the brake actuating mechanism and to reinforce it according to a gear ratio dictated by its construction. A lever 2 is pivotally mounted in a rear housing portion of a (also not shown here) caliper by this against a roller 3 is rotatably arranged, wherein the roller 3 relative to the axis of rotation of the lever 2 is positioned eccentrically. Between the roller 3 and the corresponding area of the lever 2 are needle roller bearings or needle roller cages 4 intended.

At the roller 3 opposite side is the lever 2 via corresponding needle roller bearings or needle bearing cages 5 in corresponding bearing surfaces of a preferably one-piece bearing seat body 6 pivoted.

The reinforcing mechanism A is designed so that by rotation about the roller 3 the lever 2 this opposite performs an eccentric displacement movement, which leads to a corresponding increase in the lever 2 acting actuating force, which then acts as a clamping force via a on a (not shown here) brake disc movement of the bearing seat body 6 , which may be performed for this purpose in the housing of the caliper indirectly or directly linear, is transmitted to the adjusting device B and the pressure element C.

The adjusting device B follows in the axial direction with respect to the brake disc seen immediately after the bearing seat body 6 for the lever 2 ,

The adjusting device B has a plurality of functionally interacting elements.

A designed as a hollow shaft input element 7 for the adjuster B is on the rod 1 rotatably mounted. The hollow shaft 7 has a one-piece pin 8th on, in a recess 9 in the lever 2 is included, as exemplified the 4a shows. A pivoting movement of the lever 2 displaces the input element 7 over the connection of pins 8th and recess 9 in rotation, as described in more detail below in connection with the 3a should be explained.

The input element 7 is with an initial element 10 via a freewheel spring 11 connected, which form such a first torque clutch. The starting element 10 is also on the staff 1 rotatably mounted and formed as a radial bearing hub, the axial longitudinal grooves 12 has, in the spherical body 13 a ball cage 14 slidably guided.

In this way it is possible that the starting element 10 that's about the freewheel spring 11 from the input element 7 rotationally driven, a rotational movement on a first, front coupling ring 15 a second torque clutch can transmit, and yet relative to this coupling ring 15 is arranged axially displaceable, wherein the coupling ring 15 inside also longitudinal grooves 12 ' for receiving and guiding the spherical body 13 having.

The second torque clutch is formed by the front clutch ring 15 via a ball bearing ring 16 with a second, rear coupling ring 17 interacts. Here are the balls 18 in the ball bearing ring 16 in corresponding, circumferentially in the mutually facing end faces of both the first coupling ring 15 as well as the second coupling ring 17 arranged ramps 19 led, as from the 1 can be seen, so that a corresponding torque-dependent roller-ramp mechanism is formed.

The rear coupling ring 17 then transmits a rotational movement induced thereon by means of a spring-groove connection on a hollow adjusting spindle 20 , for the realization of which the rear coupling ring 17 radially projecting, evenly distributed over the circumference springs 21 has, in correspondingly complementarily configured grooves 22 on the radial inside of the adjusting spindle 20 intervene, as exemplified in the 3b can be seen.

The adjusting spindle 20 is via a threaded engagement with a pressure piece 23 the pressure element C connected in the housing of the Caliper linearly displaceable, but not rotatably guided, so that a rotational movement to Nachstellzwecken the adjusting spindle 20 to a linear offset of the pressure piece 23 leads. As can be seen, enclosing the adjusting spindle 20 the other components of the adjusting B completely. The stamp or pot-shaped pressure piece 23 the pressure element C cooperates on its front side with a brake pad holder (not shown here) in order to transmit the application force to the brake disk.

The clamping force is in the pressure piece 23 initiated by the adjusting spindle 20 directly on the bearing seat body 6 of the lever 2 supported. Ie. by the pivotal movement of the lever 2 in the bearing seat body 6 initiated clamping force is in the adjusting spindle 20 and via the threaded engagement on the pressure piece 23 and then transferred from there via the brake pad with brake intervention in the brake disc.

Furthermore, the rear coupling ring is supported 17 via a low-friction thrust bearing 24 on the bearing seat body 6 from. The bearing seat body 6 stands with the adjusting spindle 20 directly in force-transmitting contact, wherein radial sections, circumferential, axial projections 25 the adjusting spindle 20 in a correspondingly configured annular recess 26 of the bearing seat body 6 intervention. This ensures that the main force flow of the clamping force of the bearing seat body 6 directly into the adjusting spindle 20 and via the threaded engagement on the pressure piece 23 takes place while due to the low-friction thrust bearing 24 the rear coupling ring 17 and thus the adjuster B remains largely decoupled from the application force in the axial direction as far as possible.

At the thrust bearing 24 opposite side is the front coupling ring 15 via another low-friction thrust bearing 27 on a storage ring 28 rotatably guided.

At the storage ring 28 comes a spring 29 the return device D to the plant. The spring designed as a helical spring 29 in turn relies on the interposition of a sliding ring 30 on an abutment shell 31 starting at the brake disc facing the end of the rod 1 is attached. The return spring 29 is designed so that it exerts a defined preload on the second torque coupling, which defines the limiting transmission torque between the coupling rings.

The abutment shell 31 This is an abutment ring 32 and a fastener 33 on the bar 1 held in a rotatable arrangement, as will be explained below.

In the area of the front end of the staff 1 is a bearing sleeve 34 provided on the side facing away from the brake disc directly on the front side of the output element 10 supported.

This bearing sleeve 34 takes a spring element 35 on, in turn, on the abutment ring 32 supported. In this way, according to the invention of the spring element 35 over the starting element 10 on the input element 7 exerted a defined bias.

At the brake disc end facing the bearing sleeve 34 a distance X to the abutment ring 32 on, wherein the spring element 35 an opening 36 in the abutment shell 31 be upheld.

It becomes clear that this makes it possible for the input element 7 and thus also the starting element 10 with the bearing sleeve 34 maximum to move this distance X in the axial direction of the brake disc, wherein the bearing sleeve 34 doing so through the opening 36 in the abutment shell 31 moved through until this on the abutment ring 32 comes to the plant.

With a pivoting movement of the lever 2 the recess moves 9 in the lever 2 on a circular path forward towards the brake disc. Until the upper edge of the recess 9 with the pin 8th First, a clearance A is bridged that corresponds to the wear-independent clearance of the brake, which is never adjusted.

Thereafter, the recess takes 9 the pin 8th on the pivoting movement corresponding circular path and so offset the input element 7 on the bar 1 in rotation.

At the same time is due to the resulting from the circular path feed due to the pivoting movement of the recess 9 or the lever 2 a force on the pin 8th exerted in the direction of the brake disc. Because the input element 7 and in principle, the entire adjusting device B on the rod 1 is axially displaceable, performs the input element 7 together with the adjusting device B, an axial forward movement on the rod 1 , which counteract the bias of the spring element 35 is directed.

This forward movement comes to an end when, after bridging the distance X, the bearing sleeve 34 on the abutment ring 32 comes to the plant.

Due to the fact that the pin 8th in addition to the rotation together with the recess 9 also by a maximum length X after can move forward, which are in the contact point between the recess 9 and the pin 8th acting forces reduced in the axial direction and thereby minimizes the contact friction, which can significantly increase the life of this device while reducing wear.

According to the invention, the distance X is to be chosen so that the reduction of the forces can be done to a sufficient extent and at the same time the reliability of the power transmission between the lever 2 and the pin 8th is ensured for each state of wear for the activation of the adjusting device B.

The abutment shell 31 is with the adjusting spindle 20 torque transmitting coupled by a projection 37 the abutment shell 31 in an axial longitudinal groove 38 on the inner surface of the adjusting spindle 20 slidably guided.

Because the abutment shell 31 with the adjusting spindle 20 rotates, is the brake disc facing the end of the return spring 29 over in the abutment shell 31 mounted sliding ring 30 decoupled.

The fastener 33 pointing to an annular groove 39 of the staff 1 is attached, and the abutment ring 32 can therefore work together with the abutment shell 31 rotate. According to the invention, the friction behavior between the fastener 33 and the staff 1 in the ring groove 39 determined in such a rotation via a corresponding dimensioning of these elements and / or determination of the surface finish in the contact surfaces so that in response to a defined counter-torque is exerted on the entire brake actuation mechanism which is capable of wear between relatively movably arranged components before all of the adjuster B to reduce.

Like from the 1 can be seen, the entire brake actuation mechanism is the brake disk side by that on the rod 1 rotatably mounted fastener 33 and brake disc facing away through a mounting ring 40 on the bar 1 held by the reinforcing mechanism A, the adjusting device B, the pressure element C and the return means D are arranged to functionally cooperate, wherein the hollow adjusting spindle 20 the remaining components of the adjusting device B and the restoring device D completely absorbs. The brake actuation mechanism can by means of the rod 1 mounted as a unit in a housing of the caliper and fastened.

The 4 to 6 show only the combination consisting of adjusting spindle 20 and a gear 41 which serves to reset the adjuster B when the brake pads need to be replaced. It interacts with a separate, operable from outside the caliper mechanism (not shown) together.

The gear 41 is on the adjusting spindle 20 with a certain axial distance Y from the bearing seat body 6 positioned so that immediately no clamping force in this gear 41 is initiated.

In the embodiment shown, the gear is 41 also from the output element of the second torque clutch, the rear clutch ring 17 decoupled. However, it is also conceivable that this coupling ring 17 instead of directly the adjusting spindle 20 the gear on it 41 and thus indirectly the adjusting spindle 20 drives, which for this purpose may have radially inwardly directed projections, the corresponding openings in the adjusting spindle 20 pass through and with the coupling ring 17 to enter a corresponding torque-transmitting wedge-groove connection or the like.

The gear 41 is in the region of a radially inwardly directed projection 42 through a slot 43 divided, which allows the gear 41 to pull apart radially for assembly purposes. The lead 42 engages torque transmitting in a preferably complementary shape recess 44 in the adjusting spindle 20 one. The two halves of the projection 42 also have radial recesses 45 on. This allows the gear 41 altogether lighter in a circumferential annular groove 46 the adjusting spindle 20 assemble.

The bearing seat body 6 of the reinforcing mechanism A engages directly on a front-side bearing surface 47 the adjusting spindle 20 at, by the distance Y, the gear 41 from the over this storage area 47 initiated application force remains decoupled.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• WO 2011/113554 A2 [0004, 0006, 0008, 0030]
• WO 2013/083857 A2 [0006]
• WO 2014/106672 A2 [0006]
• WO 2015/140225 A2 [0006]

Claims (10)

A brake actuation mechanism for a disc brake - comprising: an amplifying mechanism (A) for applying a application force to a pressure member (C) which transmits the application force to the brake disc; - wherein the pressure element (C) a night setting spindle ( 20 ), which with a pressure piece ( 23 ), which cooperates with a brake pad, is in a threaded engagement, so that a rotation of the adjusting spindle ( 20 ) to an axial displacement of the pressure piece ( 23 ) leads; - With an adjusting device (B), which is designed, during an operating state of the disc brake, the adjusting spindle ( 20 ) to compensate for a lining wear in rotation; and - with a drive element ( 41 ), which is configured, outside an operating state of the disc brake, the adjusting spindle ( 20 ) to turn as needed; characterized in that the drive element ( 41 ) is decoupled from the power flow of the application force by the brake actuation mechanism. Brake actuation mechanism according to claim 1, in which the drive element is designed as a toothed wheel ( 41 ) is formed, the radially outside on the adjusting spindle ( 20 ) is arranged. Brake actuation mechanism according to claim 2, in which the toothed wheel ( 41 ) in an annular groove ( 46 ) of the adjusting spindle ( 20 ) is recorded. Brake actuation mechanism according to claim 2 or 3, wherein the gear ( 41 ) a means ( 42 ) provided with a means ( 44 ) of the adjusting spindle ( 20 ) receives a torque transmitting connection. Brake actuation mechanism according to claim 4, wherein the means ( 41 ) is formed as a radially inwardly directed projection which in a form-complementary recess ( 44 ) intervenes. Brake actuation mechanism according to claim 5, in which the toothed wheel ( 41 ) is divided in the radial direction. Brake actuation mechanism according to one of the preceding claims, in which the adjusting spindle ( 20 ) frontally at least one radially inwardly and coaxially outwardly offset ring element ( 25 ), which with a shape-complementary recess ( 26 ) of the reinforcing mechanism (A). Brake actuation mechanism according to claim 7, wherein in the ring element ( 25 ) radially inside several recesses ( 22 ) are provided, which are designed to with corresponding projections ( 21 ) of an output element ( 17 ) of the adjusting device (B) enter into a torque-transmitting and axially displaceable connection. Disc brake comprising a brake actuating mechanism according to at least one of claims 1 to 8. Disc brake according to Claim 9, in which the brake-actuating mechanism according to at least one of Claims 1 to 8 is provided by a rod ( 1 ) is mountable in a housing of a caliper of the disc brake as a self-supporting unit.

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