DE102020101058A1 - Disc brake for a commercial vehicle and brake pad set - Google Patents

Abstract

A disc brake (10) for a commercial vehicle, with a brake disc (2) overlapping, designed as a sliding caliper, which is attached to a stationary brake carrier (6), two in the brake caliper (1), movable in opposite directions, one each Lining carrier plate (4, 4 ') and brake linings (3, 3') having a friction lining (5, 5 ') attached to it, one of which is an action-side or application-side brake lining (3) by means of an application device via at least one brake pad against the brake disc ( 2) can be pressed, as well as at least one restoring device (8, 8 ') with which the brake linings (3, 3') can be returned after a braking-related displacement and release of the brake, the restoring device (8, 8 ') at least one on one Brake pad (3, 3 ') has attached return element (15, 18, 20, 22, 24, 26, 28), which is arranged between this brake pad (3, 3') and a fixed reference and on the brake pad (3, 3 ') a back exercise power. The at least one restoring element (15, 18, 20, 22, 24, 26, 28) is designed as a leaf spring element with a spring arm (16, 19, 21, 23, 25, 27, 29) and the fixed reference is a contact section ( 6d, 6'd) of the brake carrier (6). And a brake pad set with reset elements.

Description

The invention relates to a disc brake for a utility vehicle according to the preamble of claim 1. The invention also relates to a brake pad set.

In the case of a disc brake of the generic type, also known as a sliding caliper brake (or floating caliper brake), an action-side brake pad is pressed against a vehicle-side brake disc in the event of braking by means of an application device that can be actuated pneumatically or by an electric motor. In the further course of the braking process, the brake caliper is displaced against the application direction of the action-side brake pad with respect to the brake disc, with the opposite, reaction-side brake pad being entrained and pressed against the other side of the brake disc.

After the brake is released, in the known disc brake, the brake caliper remains in this position, in which the brake linings, but at least the reaction-side brake lining, admittedly pressurelessly but rubbing against the brake disc. The residual grinding moments of the brake linings that occur during driving have a disadvantageous effect in that they lead to increased fuel consumption as well as to a reduction in the service life of the components involved, namely the brake disc and the brake linings.

There is a slight loosening of the brake linings during driving, for example due to wobbling of the brake disc as well as vibrations and lateral acceleration when cornering. However, these effects are not sufficient to effectively prevent the residual grinding torques mentioned. Likewise, after the brake linings are released from the brake disc, these effects can again lead to the brake linings resting against the brake disc, which in turn can result in a residual grinding torque.

To counter this problem is in the generic DE 10 2007 001 213 discloses a disc brake with a resetting device which is arranged in one of the guide bars via which the brake caliper is slidably held on the brake carrier and which has a resilient return element by means of which the brake caliper is displaced into an initial position.

In principle, this construction has proven itself. However, the use of this known reset device in compressed air-operated disc brakes for heavy commercial vehicles can lead to problems, since wide limits of variable influences from component tolerances and component deformations are effective, which do not always allow this reset device to function reliably.

Similar problems arise with a disc brake as in the DE 10 2012 006 111 A1 is thematized. A restoring device is arranged on the side opposite the application device and facing the reaction-side brake lining, whereby an effective, in particular automatic, resetting of the brake caliper is achieved with minimal intervention in the system rigidity.

In any case, the resetting device acts on the brake caliper, the brake carrier acting as an abutment.

DE 10 2016 117 777 relates to a disc brake for a commercial vehicle, with a brake disc overlapping, designed as a sliding caliper, which is attached to a stationary brake carrier and has a central opening above the brake disc, two arranged in the brake caliper, movable in opposite directions, each one a lining carrier plate and a friction lining mounted on it having brake pads, of which an action-side or application-side brake pad can be pressed against the brake disc by means of an application device via at least one brake plunger, and at least one reset device with which the brake pads can be returned after a braking-related shifting and releasing of the brake. The restoring device has at least one restoring element attached to a brake lining, which is arranged between this brake lining and a fixed reference and exerts a restoring force on the brake lining.

The invention is based on the object of further developing a disc brake of the generic type in such a way that the service life, in particular of the brake linings and the brake disc, is increased by means of the simplest construction and the operating costs are reduced overall.

Another object is to provide a corresponding brake pad set.

This object is achieved by a disc brake with the features of claim 1.

The further object is achieved by a brake pad set with the features of claim 15.

A disc brake according to the invention for a utility vehicle comprises a brake disc overlapping, designed as a sliding caliper, which is attached to a stationary brake carrier, two arranged in the brake caliper, oppositely movable, each having a lining carrier plate and a friction lining attached to it, of which an action-side or application-side brake lining can be pressed against the brake disc by means of an application device via at least one brake piston, as well as at least one restoring device with which the brake linings after a braking-related displacement and Release of the brake are traceable, the restoring device having at least one restoring element attached to a brake lining, which is arranged between this brake lining and a fixed reference and exerts a restoring force on the brake lining. The at least one return element is designed as a leaf spring element with a spring arm and the fixed reference is a contact section of the brake carrier.

The restoring element is advantageously designed as a simple leaf spring element which protrudes over the brake lining in the radial direction in the direction of the center of the axis. This can equally be provided for both brake linings. The protruding end of the leaf spring is braced in the axial direction with respect to the brake carrier. The resulting spring force causes a restoring force on the respective brake lining. As a result of the support of the spring elements on the stationary brake carrier, not only the brake linings are positioned relative to the brake disc, but advantageously also the axially displaceable brake caliper. By centering the brake pads and the brake caliper opposite the brake disc, an ideal reduction of residual grinding torques can be made possible

The restoring elements as leaf spring elements are particularly advantageously simple and inexpensive to manufacture, e.g. as stamped / bent parts.

A brake pad set according to the invention for the disc brake according to the invention has an application-side brake lining and a rear-side brake lining, the application-side brake lining and the rear-side brake lining having at least one restoring element of a restoring device, which is designed as a leaf spring element with a spring arm.

This results in the advantage that when the brake linings are inserted, due to the pre-assembled return elements, they do not have to be applied subsequently.

Further advantageous developments of the invention are characterized in the subclaims.

In a preferred embodiment, the at least one restoring element exerts a tensile force as a restoring force on the brake lining to which the at least one restoring element is attached. One advantage here is the small footprint.

It is particularly advantageous if the at least one restoring element, when the associated brake lining is installed, is arranged preloaded with respect to the contact section of the brake carrier. In addition to this pre-tension, a further pre-tension, which is brought about by the application of the brake, is added to the braking process. This bias of the at least one restoring element can, depending on the design, also increase as the lining / disk wear increases.

In one embodiment, the at least one restoring element is attached to a pressure side of a lining carrier plate of the brake lining with a fastening section which is connected to the respective spring arm. Such an attachment is simple and requires little adjustment work.

It is particularly advantageous if the at least one restoring element engages or acts on the pressure side of the backing plate of the brake lining in the area of a mean friction radius, a center of gravity or in the middle, ie centrally in the intersection or in the area of this intersection of an imaginary transverse axis of the brake lining and an imaginary longitudinal axis of the brake lining acts, since in this way a tilting behavior of the brake lining can be prevented or essentially reduced.

This particular advantage also arises in the case when at least two restoring elements on the pressure side of the lining carrier plate of the brake lining act or act on an imaginary longitudinal axis of the brake lining symmetrically to an imaginary transverse axis of the brake lining in two contact areas to the right and left thereof in the area of a mean friction radius.

In a further embodiment, the at least one restoring element with its respective fastening section is on the pressure side ( 4b , 4'b ) attached to the backing plate of the brake pad so that it cannot rotate about an axis which runs parallel to a brake disk axis of rotation of the brake disk. This can be done in a simple manner using two fastening elements (screws, rivets, etc.). It is also possible that only one fastener and one pin are used. This advantageously simply prevents a rotation and thus a reduction in the function of the restoring element.

The anti-twist device of the at least one return element can also be provided with a tab section that is connected to the spring arm, be formed, wherein the tab portion has two upwardly projecting tabs which are supported in a through opening of the lining carrier plate. Such a through opening, which is often already present, can advantageously be used twice in this way without requiring additional processing.

Another embodiment provides that a rotation lock of the at least one return element is formed by a form fit of the fastening section connected to the spring arm in a recess of the brake lining carrier plate corresponding to the shape of the fastening section, the fastening section being fastened in the recess, for example by pressing is.

In a further embodiment, a rotation lock of the at least one reset element can be formed on the brake lining by means of pressed-on friction material of the respective friction lining, the reset element being connected to an insert and, before the friction material is pressed onto the lining carrier plate, from a lining side of the lining carrier plate through a through opening in the lining carrier plate is threaded, wherein the insert closes the through opening and is covered by the friction lining and is fixed in the lining carrier plate.

In an alternative or additional / combined embodiment, the spring arm of the at least one restoring element can be designed as a curved leaf spring element and attached to the lining carrier plate of the brake lining with pretension. This embodiment offers the advantage that, due to the curvature provided, there is already a preload when the restoring element is attached to the pressure side of the lining carrier plate. This can then be transferred to the contact section of the brake carrier interface during the assembly of the brake lining in the brake carrier, whereby a larger preload path is made possible with little installation space requirement

In yet another embodiment, the spring arm of the at least one restoring element has a contact end, sections of this contact end and / or a section of the spring arm being in contact with a contact section of the brake carrier in the area of the connection with the contact end. This results in an advantageously simple installation without tools.

Installation is particularly advantageously facilitated if the contact end has a radius.

Another embodiment provides that the contact end is connected to the spring arm via a crank. The crank ensures that the reset element can be installed more easily. The flat contact of the restoring element on the contact section of the brake carrier interface of the brake carrier, which is possible as a result, improves a potential tilting behavior of the brake linings. The offset can be designed inwards, i.e. pointing towards the brake lining, or outwards, i.e. pointing away from the brake lining. This results in an advantageously simple possibility of adapting to different designs of brake carriers.

In a further version, at least two return elements ( 15th , 18th , 20th , 22nd , 24 , 26th , 28 ) on the pressure side ( 4b , 4'b ) of the backing plate ( 4th ) of the brake lining ( 3 , 3 ' ) attached, the at least two return elements ( 15th , 18th , 20th , 22nd , 24 , 26th , 28 ) are each designed with a different spring rate. In this way, different spring forces can advantageously be set on the inlet and outlet sides, and potential tangential oblique wear can be counteracted in a targeted manner. This is particularly advantageous in the case of a single-piston design of the disc brake.

Embodiments of the invention are described below with reference to the accompanying drawings.

• 1 eine schematische Draufsicht einer Scheibenbremse aus dem Stand der Technik;
• 2 eine schematische perspektivische Teilansicht eines Bremsträgers mit einem zuspannseitigen Bremsbelag und Rückstellelementen eines ersten Ausführungsbeispiels einer Rückstelleinrichtung einer erfindungsgemäßen Scheibenbremse;
• 3 eine schematische perspektivische Teilansicht des Bremsträgers mit einem rückenseitigen Bremsbelag und Rückstellelementen des ersten Ausführungsbeispiels der Rückstelleinrichtung nach 2;
• 4 eine schematische perspektivische Teilansicht des Bremsträgers mit einem rückenseitigen Bremsbelag und Rückstellelementen eines zweiten Ausführungsbeispiels der Rückstelleinrichtung;
• 5 eine schematische perspektivische Teilansicht des Bremsträgers mit einem rückenseitigen Bremsbelag und Rückstellelementen einer Variation des zweiten Ausführungsbeispiels der Rückstelleinrichtung nach 4;
• 6-7 schematische Perspektivansichten von Rückstellelementen des zweiten Ausführungsbeispiels und der Variation des zweiten Ausführungsbeispiels der Rückstelleinrichtung;
• 8-9 schematische Teilansichten des Bremsträgers mit einem rückenseitigen Bremsbelag und mit einem Rückstellelement eines dritten Ausführungsbeispiels der Rückstelleinrichtung;
• 10 eine schematische Perspektivansicht des Bremsträgers mit einem rückenseitigen Bremsbelag und mit einem Rückstellelement eines vierten Ausführungsbeispiels der Rückstelleinrichtung;
• 11 eine schematische Perspektivansicht des Bremsträgers mit einem rückenseitigen Bremsbelag und mit einem Rückstellelement eines fünften Ausführungsbeispiels der Rückstelleinrichtung;
• 12 eine schematische Perspektivansicht des Rückstellelementes des fünften Ausführungsbeispiels der Rückstelleinrichtung nach 11;
• 13 eine schematische Schnittansicht eines rückenseitigen Bremsbelags mit einem Rückstellelement eines sechsten Ausführungsbeispiels der Rückstelleinrichtung;
• 14 eine schematische Perspektivansicht des Rückstellelementes des sechsten Ausführungsbeispiels der Rückstelleinrichtung nach 13; und
• 15 eine schematische Ansicht des rückenseitigen Bremsbelags mit dem Rückstellelement des sechsten Ausführungsbeispiels der Rückstelleinrichtung nach 13.

Show it:

• 1 a schematic plan view of a disc brake from the prior art;
• 2 a schematic perspective partial view of a brake carrier with an application-side brake lining and restoring elements of a first embodiment of a restoring device of a disc brake according to the invention;
• 3 a schematic perspective partial view of the brake carrier with a rear brake pad and reset elements of the first embodiment of the reset device according to 2 ;
• 4th a schematic perspective partial view of the brake carrier with a rear brake lining and reset elements of a second embodiment of the reset device;
• 5 a schematic perspective partial view of the brake carrier with a rear-side brake lining and reset elements according to a variation of the second embodiment of the reset device 4th ;
• 6-7 schematic perspective views of resetting elements of the second exemplary embodiment and the variation of the second exemplary embodiment of the resetting device;
• 8-9 schematic partial views of the brake carrier with a rear brake lining and with a restoring element of a third embodiment of the restoring device;
• 10 a schematic perspective view of the brake carrier with a rear brake lining and with a restoring element of a fourth embodiment of the restoring device;
• 11 a schematic perspective view of the brake carrier with a rear brake lining and with a restoring element of a fifth embodiment of the restoring device;
• 12th a schematic perspective view of the resetting element of the fifth embodiment of the resetting device according to FIG 11 ;
• 13th a schematic sectional view of a rear brake pad with a reset element of a sixth embodiment of the reset device;
• 14th a schematic perspective view of the resetting element of the sixth embodiment of the resetting device according to FIG 13th ; and
• 15th a schematic view of the rear brake lining with the reset element of the sixth embodiment of the reset device according to FIG 13th .

The terms “top”, “bottom”, “left”, “right” relate to the respective arrangements in the figures.

A "top" and a "bottom" of a brake pad 3 , 3 ' or a backing plate 4th always refer to the installation situation of the respective brake pad 3 , 3 ' . The underside of the respective brake pad is located here 3 , 3 ' in the radial direction closer to a brake disc axis of rotation 2a a brake disc 2 than the top of that brake pad 3 , 3 ' .

With the term "transverse axis" of the brake pad 3 , 3 ' an imaginary axis is meant, which in the installed state of the brake pad 3 , 3 ' radial to the brake disc axis of rotation 2a runs. A "longitudinal axis" of the brake pad 3 , 3 ' thus runs at right angles to the transverse axis and tangential to the brake disc 2 .

1 Figure 3 shows a schematic plan view of a disc brake 1 from the state of the art.

The disc brake 1 is here as a pneumatic disc brake 1 executed. However, it can also be operated in other ways, for example hydraulically, electrically or in combinations thereof. The disc brake 1 includes a brake disc 2 with a brake disc axle 2a , Brake pads 3 , 3 ' , a brake carrier 6th and a caliper 10 . The disc brake 1 can also be equipped with a reset device. This is not shown here, it is referred to in the document DE 10 2016 117 777 A1 referenced.

The brake disc 2 is from the brake caliper, which is designed here as a sliding caliper 10 encroached upon. The caliper 10 is on the stationary brake carrier 6th in the direction of the brake disc axis of rotation 2a slidably attached and has a central opening 9 above the brake disc 2 on.

The caliper 10 comprises an application section 11 , a saddle back 12th and two tension struts 13th . The back of the saddle 12th is with the application section 11 at each end with a tension strut 13th connected.

The application section 11 has an interior space in which an application device, not shown, of the disc brake 1 is arranged.

The application section 11 , the back of the saddle 12th and the tension struts 13th lay a central opening in this arrangement 9 between them firmly which the brake disc 2 overstretched.

The side of the brake carrier 6th , which to the application section 11 of the caliper 10 has, is called the attachment side 6a designated. The brake carrier 6th is with its attachment side 6a attached to a stationary part of an associated vehicle.

Both sides of the brake disc 2 is a brake pad each 3 , 3 ' arranged. The one between the brake disc 2 and the application section 11 of the caliper 1 arranged brake pad 3 is used as the brake pad on the application side 3 designated. The other brake pad 3 ' is between the brake disc 2 and the back of the saddle 12th arranged and is used as a rear brake pad 3 ' designated. To distinguish them, reference symbols with an apostrophe identify components and sections on the side of the back of the saddle 12th are arranged

Any brake pad 3 , 3 ' has a backing plate 4th , 4 ' and one on the backing plate 4th , 4 ' attached friction lining 5 , 5 ' on. The friction lining 5 , 5 ' is on one side of the covering 4a , 4'a the backing plate 4th , 4 ' attached. The covering side 4a , 4'a is the brake disc 2 facing. The friction linings 5 , 5 ' are in function, i.e. when braking, against the brake disc 2 pressed.

The other side of the backing plate 4th , 4 ' is hereinafter referred to as the print page 4b , 4'b designated. This is how the application-side brake lining stands 3 with its print side 4b with the application device of the disc brake 1 via a brake pad 11a in operative connection. The disc brake shown here 1 has only one brake stamp 11a on; However, disc brakes can also be equipped with two or more brake pads.

The print side 4'b of the rear brake pad 3 ' stands with the inside of the back of the saddle 12th of the caliper 10 in contact.

In the brake carrier 6th are the brake pads 3 , 3 ' in so-called lining shafts between two brake carrier horns 6b , 6'b and lie with sections of their undersides on respective support sections 6e , 6'e (see 2 and 3 ) of a respective lining well bottom of the brake carrier 6th on. There are the brake pads 3 , 3 ' in the axial direction with respect to the brake disc axis of rotation 2a movable. The bottom of the lining shaft is connected by a bridge connector 6c , 6'c (see 2 and 3 ) of the brake carrier 6th educated.

The brake pads 3 , 3 ' are on both sides of the brake disc in the event of braking 2 can be pressed on and through the central opening 9 accessible for replacement and maintenance. You can through this central opening 9 can be inserted into their associated covering shafts and removed from them again.

The brake pads 3 , 3 ' are in the example shown in different ways in their lining shafts in the brake carrier 6th held in the radial direction. In the radial direction on the brake disc axis of rotation 2a there are both brake pads 3 , 3 ' on the respective support sections 6e , 6'e. In the opposite radial direction, that of the brake disc axis of rotation 2a points away is the brake pad on the application side 3 , as in 2 is shown, with non-labeled lugs protruding on its sides in contour guides 6f in the respective brake carrier horn 6b , 6'b axially, ie in the direction of the brake disc axis of rotation 2a , displaceably guided. The contour guides 6f with their contour form a radial definition of the brake lining on the application side 3 .

On the top of the brake pad on the application side 3 is a pad retaining spring 7th arranged, which in its central area on the lining carrier plate 4th is held in a manner not described in detail and each with their ends on a brake carrier horn 6b , 6'b is supported. This is how the application-side brake lining is 3 in the radial direction from the brake disc axis of rotation 2a pointing away with its noses against upper sections of the guide contours 6f by means of a tensile force of the pad retaining spring 7th pressed.

As in 1 can be seen, is a length of the lining carrier plate in the example of the prior art shown 4th of the application-side brake lining 3 greater than a length of the backing plate 4 ' of the rear brake pad 3 ' .

The rear brake pad 3 has no tabs on the side and is held by means of a short pad retainer 14th in the radial direction from the brake disc axis of rotation 2a kept pointing away. The pad retainer 14th is on the back of the saddle 12th attached, extends parallel to the brake disc axis of rotation 2a over the rear brake pad 3 ' and stands with a pad retaining spring 7 ' of the rear brake pad 3 ' (here via a hood 7'a) in contact. The pad retaining spring 7 ' is on top of the backing plate 4 ' of the rear brake pad 3 ' with the hood 7'a (see also 4th , 5 ) appropriate.

Braking takes place by means of the in the application section 11 of the caliper 10 arranged application device, for example with a brake lever in a dome of the brake caliper 10 is positioned. The brake pad on the application side 3 first makes contact with the brake disc when braking 2 . In the further course, the brake caliper is activated by means of the reaction forces that occur 10 shifted in the opposite direction, taking along the reaction-side brake pad 3 ' until it is also on the brake disc 2 comes to the plant rubbing.

In 2 is a schematic perspective partial view of a brake carrier 6th with a brake pad on the application side 3 and return elements 15th of a first embodiment of a reset device 8th , 8th' a disc brake according to the invention 1 shown. 3 shows a schematic perspective partial view of the brake carrier 6th with a rear brake pad 3 ' and return elements 15th of the first embodiment of the reset device 8th , 8th' to 2 .

After releasing the brake, the two opposing brake pads are 3 , 3 ' by means of the reset device 8th , 8th' so far from the brake disc 2 solved that this is opposite the brake pads 3 , 3 ' can rotate freely.

On every brake pad 3 , 3 ' is a reset device in each case 8th , 8th' attached and exercises each on the associated brake pad 3 , 3 ' a force from which is referred to below as the restoring force. This restoring force moves the respective brake lining 3 , 3 ' in the direction of the brake disc axis of rotation 2a , ie in the axial direction, from the brake disc 2 path. In other words, the brake lining on the application side 3 is thereby through its reset device 8th from the brake disc 2 in the opposite direction of an application force of the application device on the application section 11 of the caliper 10 moved, with the rear brake pad 3 ' thereby through its reset device 8th' from the brake disc 2 away in to the application-side brake pad 3 opposite direction of movement together with the brake caliper 10 is moved.

The restoring force of the restoring device 8th , 8th' is generated by one or more energy storage elements. These energy storage elements are designed here as spring elements, which are located between the respective brake lining 3 , 3 ' and a stationary reference are attached in a prestressed manner. Disc brake components are under the fixed reference 10 to understand which are fixedly connected to the vehicle to be assigned, such as the brake carrier 6th .

The restoring force can be applied to the respective brake lining 3 , 3 ' be applied as tensile and / or compressive force. Here the restoring force is used as a tensile force on the respective brake lining 3 , 3 ' upset.

The reset device 8th , 8th' has two return elements here 15th on every brake pad 3 , 3 ' on.

The reset elements 15th are structured in the same way. It is therefore only a return element 15th described.

The reset element 15th is a simple leaf spring element with a spring arm 16 , which here has a flat rectangular cross-section. The spring arm 16 has a first end with an attachment portion 16a and a second end as a contact end 16b on. In the fastening section 16a are a mounting hole 16c and a guide hole 16d molded. The end of contact 16b is provided with a radius (rounding).

The fastening of the return elements 15th As leaf spring elements, various fastening methods such as riveting, screwing, welding, tumbling, pressing, etc. can be used.

The reset element 15th is with the attachment end 16a on the pressure side 4b , 4'b the backing plate 4th , 4 ' of the brake pad 3 , 3 ' attached. In the example shown is a fastener 17th , e.g. a rivet, through the mounting hole 16c guided and in the backing plate 4th , 4 ' fixed. The guide hole 16d engages another rivet or pin. This prevents the resetting element from rotating in relation to the lining carrier plate 4th , 4 ' educated. The term "anti-rotation device" will be used several times below. This is a rotation lock of the respective return element 15th about an axis that is parallel to the brake disc axis of rotation 2a runs to understand. This axis can, for example, through the fastening element 17th get lost.

In this way is the reset element 15th so on the backing plate 4th , 4 ' attached that it is in the radial direction downwards (in the direction of the center of the axis of the brake disc rotation axis 2a ) extends and with the contact end 16b over the lower edge of the backing plate 4th , 4 ' of the brake pad 3 , 3 ' protrudes. The concave side of the radius or rounding of the contact end 16b points from the pressure side 4b , 4'b path.

The reset elements 15th are here in pairs on the pressure side 4b , 4'b the backing plate 4th , 4 ' a brake pad 3 , 3 ' symmetrical to an imaginary transverse axis Q the backing plate 4th , 4 ' each in the area of a short side of the backing plate 4th , 4 ' arranged. The short sides of the backing plate 4th , 4 ' are each in contact with a brake carrier horn 6b , 6'b.

The reset elements 15th have a reset function for the respective brake lining 3 , 3 ' also the other function, a tilting of the respective brake lining 3 , 3 ' to prevent. This is done by the reset elements 15th for example in the area of a mean friction radius, a center of gravity or in the middle, ie centrally in the intersection or in the area of the intersection of the imaginary transverse axis Q and an imaginary longitudinal axis L. of the brake pad 3 , 3 ' , symmetrical about the transverse axis Q on two plant areas to the right and left of it on the longitudinal axis L. of the brake pad 3 , 3 ' on. In this way, a tilting moment of the respective brake lining 3 , 3 ' around the longitudinal axis L. , which is an inclination of the respective brake pad 3 , 3 ' cause, be reduced or even eliminated.

The protruding contact end 16b of the reset element 15th is opposite the brake carrier 6th braced in the axial direction and stands over the convex side of the rounding or the radius of the contact end 16b and / or with a section of the spring arm 16 in the area of the connection with the contact end 16b with a contact section 6d , 6'd of the brake carrier 6th in contact. The contact sections 6d , 6'd are in the example shown in the transition areas of the bridge connector 6c , 6'c with the brake carrier horns 6b , 6b of the brake carrier. The contact sections 6d (see e.g. 2 ) can also be processed (e.g. as an incline, as a surface, etc.).

The resulting spring force of the resetting elements tensioned in this way 15th causes a restoring force on the respective brake lining 3 , 3 ' . By supporting the reset elements 15th on the stationary brake carrier 6th are not just the brake pads 3 , 3 ' to the brake disc 2 positioned, but also the axially movable brake caliper 10 with the application unit in the application section 11 . By centering the brake pads 3 , 3 ' and the caliper 6th with the application unit opposite the brake disc 2 an ideal reduction of residual grinding torques can be made possible.

The interface to the brake carrier 6th showing the contact sections 6d , 6'd has is designed so that the restoring element 15th when assembling the brake pads 3 , 3 ' automatically preloads. This preload already has a restoring effect on the brake linings when they are new 3 , 3 ' and thus a reduction in the residual grinding torque is possible. The preload can, for example, be via the radius at the contact end 16b of the reset element 15th or via a slope, as indicated above, on the brake carrier 6th respectively. This pushes the reset element 16 when assembling the brake pad 3 , 3 ' in the axial direction and is preloaded.

The required spring rate and spring force of the return element 15th can about the geometry of the spring arm 16 and its ends 16a , 16b defined.

With increasing wear of the brake lining 3 , 3 ' and brake disc 2 the spring force of the return elements increases 15th to a certain extent continuously. This preload force is partially reduced again by plastic deformation and temperature influences, which results in an almost constant restoring force on the brake linings 3 , 3 ' adjusts.

In a version with two return elements 15th as leaf springs per brake lining 3 , 3 ' it is also possible to use the two return elements 15th each with a different spring rate. As a result, different spring forces are set on the inlet and outlet sides, and potential tangential oblique wear can be counteracted in a targeted manner. This is particularly the case with a single-piston design of the disc brake 1 (please refer 1 ) advantageous.

4th shows a schematic perspective partial view of the brake carrier 6th with a rear brake pad 3 ' and return elements 18th of a second embodiment of the reset device 8th , 8th' . In 5 is a schematic perspective partial view of the brake carrier 6th with a rear brake pad 3 ' and return elements 20th a variation of the second embodiment of the resetting device 8th , 8th' to 4th shown. 6th shows a schematic perspective view of the restoring element 18th of the second embodiment. In 7th Figure 3 is a schematic perspective view of the return element 20th the variation of the second embodiment of the reset device 8th , 8th' shown.

The reset elements 18th of the second embodiment are outwardly cranked execution of a leaf spring element.

The reset elements 18th are structured in the same way. It is therefore only a return element 18th described.

The reset element 18th includes a spring arm 19th with a fastening section 19a like the reset element 15th , a crank 19b , a contact end 19c and an end portion 19d .

The fastening section 19a of the reset element 18th is with a mounting hole 19e and a guide hole 19f Mistake. This and the fastening of the reset element 18th are already in connection with the reset element above 15th described.

At the free end of the spring arm 19th is the crank 19b molded in the form of a short section that extends approximately at right angles from the spring arm 19a extends outward, that is, in the attached state of the return element 18th on the pressure side 4b , 4'b the backing plate 4th , 4 ' from the print side 4b , 4'b protrudes.

The free end of the crank 19b is with the flat contact end 19c connected, which in turn at its free end the end portion 19d which is angled outward.

By the crank 19b becomes easier to assemble the reset element 18th guaranteed. The flat support of the restoring element that is possible as a result 18th with the end section 19d at the contact portion 6d , 6'd the brake carrier interface of the brake carrier 6th improves a potential tilting behavior of the brake pads 3 , 3 ' .

In the variation after 5 and 7th is the reset element 20th essentially like the reset element 18th designed as a leaf spring element and comprises a spring arm 21 with a fastening section 21a that has a mounting hole 21 e and a guide hole 21f has, a crank 21 b, a contact end 21c and an end portion 21d . The fastening of the reset element 20th on the backing plate 4th , 4 ' is above in connection with the reset element 15th described.

The reset element 20th differs from the reset element 18th due to an inward-cranked design. The crank 21b therefore points inwards, ie when the return element is attached 20th to the print side 4b , 4b of the lining carrier plate 4th , 4 ' . Because of the inward-pointing crank 21b can be an advantageous design of the interface on the brake carrier 6th , ie the contact sections 6d , 6'd of the brake carrier 6th be made possible

In the 4th and 5 is also a bracket for the pad retaining spring 7 ' of the rear brake pad 3 ' by means of a hood 7th shown. The hood 7th stands with a middle section of the pad retaining spring 7 ' in engagement not described in more detail and extends with an unspecified holding portion through a through opening 4c in an upper, middle area of the backing plate 4 ' .

8-9 show schematic partial views of the brake carrier 6th with a rear brake pad 3 ' and with a reset element 22nd of a third embodiment of the reset device 8th , 8th' . In 9 Figure 3 is a side view of the brake pad 3 ' in the brake carrier 6th shown, the brake carrier horn 6'b not being shown.

The reset element 22nd of the third embodiment is as a curved leaf spring element with bias on the brake lining 3 ' educated.

The reset element 22nd includes a spring arm 23 with a fastening section 23a like the reset element 15th , two arch sections 23b , 23c , and a contact end 23d .

An end portion of the attachment portion 23a is in the attached state of the reset element 22nd on the pressure side 4b , 4'b the backing plate 4th , 4 ' on. The fastening is similar to that in connection with the reset element 15th described above. The part of the fastening section that adjoins the end section 23a indicates the guide hole 23f up and is with the first arch section 23b who made the mounting hole 23e having connected. These two sections are bent in such a way that their concave sides face the pressure side 4b , 4b of the lining carrier plate 4th , 4 ' point.

The first arch section 23b is with the spring arm 23 connected, which partly on the pressure side 4b , 4'b the backing plate 4th , 4 ' rests. The other part gradually lifts up from the print side 4b , 4'b off and is with the second arch section 23c connected, with a convex side of this connection to the pressure side 4b , 4'b shows. The second arch section 23c then continues curved so that its concave side towards the pressure side 4b , 4b has. The free end of the second arch section 23c goes into the approximately straight end of the contact 23d about which the contact section 6d , 6'd of the brake carrier 6th contacted.

This embodiment offers the advantage that the provided curvature of the first arch section 23b together with part of the fastening section 23a on the pressure side 4b , 4'b the backing plate 4th , 4 ' on the brake pad 3 , 3 ' already when attaching the reset element 22nd on the pressure side 4b , 4'b the backing plate 4th , 4 ' on the brake pad 3 , 3 ' there is a bias. This can then be done when installing the brake pad 3 , 3 ' in the brake carrier 6th on the contact section 6d , 6'd the brake carrier interface, whereby a larger preload path is made possible with little space requirement.

A respective width of the reset elements 15th , 18th , 20th , 22nd corresponds approximately to the width of the pad retaining spring 7 ' .

The first, second and third exemplary embodiments of the resetting device 8th , 8th' each has two return elements 15th , 18th , 20th , 22nd on. It is also possible that the number of reset elements 15th , 18th , 20th , 22nd can be greater than two.

10 Figure 3 shows a schematic perspective view of the brake carrier 6th with a rear brake pad 3 ' and with a reset element 24 of a fourth embodiment of the reset device 8th , 8th' represent.

Instead of two or more return elements 15th , 18th , 20th , 22nd as leaf springs it is also possible to have only one return element 24 to be used as a leaf spring element. This is implemented in the fourth embodiment, which 10 indicates.

The reset element 24 has a spring arm 25th , an attachment portion 25a with a mounting hole 25g , a connecting section 25b , a contact end 25c with a bent end portion 25d , a step section 25e and a tab portion 25f on.

The reset element 24 is along the transverse axis Q the backing plate 4th , 4 ' (please refer 4th ) in the middle of the pressure side 4b , 4'b the backing plate 4th , 4 ' arranged and has a width that is approximately a length of the hood 7a is equivalent to.

The representation in 10 shows the brake pads 3 , 3 ' when worn, with only a residual thickness of the friction linings 5 , 5 ' is available. The brake pads 3 , 3 ' are correspondingly on the brake disc by a wear adjustment device, not shown 2 adjusted. The spring arm 24 of the built-in reset element 24 is therefore bent in a corresponding manner in this state.

This in 10 upper end of the spring arm 25th is with the fastening section 25a connected, which on the pressure side 4b , 4'b and, as already described above, via its mounting hole 25e on the backing plate 4th , 4 ' is firmly attached. The top of the attachment section 25a is via an angled step section 25e with the tab section 25f connected. The tab section 25f has two upwardly protruding tabs that are located in the existing through opening 4c in the upper area of the backing plate 4th , 4 ' below the hood 7a prop up. This support forms an anti-twist device for the resetting element 24 .

The spring arm 25th is at its lower end over the connecting section 25b with the contact end angled downwards 25c connected, which at its free end the outwardly bent end portion 25d having. The end of contact 25c and part of the connecting portion 25b stand with a contact section 6'g in a central area of the bridge connector 6'c of the brake carrier 6th in contact.

11 shows a schematic perspective view of the brake carrier 6th with a rear brake pad 3 ' and with a reset element 26th of a fifth embodiment of the resetting device 8th , 8th' . 12th shows a schematic perspective view of the restoring element 26th of the fifth embodiment of the resetting device 8th , 8th' to 11 represent.

The reset element 26th as a leaf spring element comprises a spring arm 27 , an attachment portion 27a , a connecting section 27b , a contact end 27c with a bent end portion 27d and a step section 27e .

The reset element 26th is like the reset element 24 of the fourth embodiment along the transverse axis Q the backing plate 4th , 4 ' (please refer 10 ) in the middle of the pressure side 4b , 4'b the backing plate 4th , 4 ' arranged and has a width that is approximately a length of the hood 7a is equivalent to.

The reset element 26th of the fifth embodiment of the resetting device 8th , 8th' differs from the reset element 24 of the fourth embodiment in the configuration of the fastening portion 27a and the attachment to the backing plate 4th , 4 ' of the respective brake pad 3 , 3 ' . So is the attachment section 27a formed as a rectangular plate over the step portion 27e with the upper end of the spring arm 27a connected is. The step section 27e extends to the backing plate 4th , 4 ' pointing at about 90 ° from the spring arm 27a .

The fastening section 27a is here via a press fit in one with the shape of the fastening section 27a corresponding recess 4d from the print side 4b , 4'b in the backing plate 4th , 4 ' attached.

The reset element 26th of the fifth embodiment of the resetting device 8th , 8th' has the advantage that it is achieved by pressing (in a corresponding processing) of the fastening section 27a on the pressure side 4b , 4'b the backing plate 4th , 4 ' is attached. This type of fastening with the rectangular shape of fastening section 27a and the corresponding recess 4d forms a form-fitting anti-rotation lock for the reset element 26th .

The shape of the attachment portion 27a can also have another angular shape in addition to a rectangular shape.

It is also conceivable that the fastening section 27a and the recess corresponding to it 4d have an oval or round shape. In the case of a circular shape, an anti-twist device can be provided, for example, by pinning and / or caulking between the fastening section 27a and the backing plate 4th , 4 ' be realized.

The design and function of the other end of the reset element 26th with the connecting section 27b , End of contact 27c and end section 27d is above in connection with the reset element 24 of the fifth embodiment explained.

In 13th Fig. 3 is a schematic sectional view of a rear brake pad 3 ' with a reset element 28 of a sixth embodiment of the reset device 8th , 8th' shown. 14th shows a schematic perspective view of the restoring element 28 of the sixth embodiment of the reset device 8th , 8th' to 13th represent. 15th shows a schematic view of the rear brake pad 3 ' with the reset element 28 of the sixth embodiment of the reset device 8th , 8th' to 13th .

The reset element 28 of the sixth embodiment is like the restoring element 24 of the fourth embodiment also designed as a leaf spring element and along the transverse axis Q the backing plate 4th , 4 ' (please refer 10 ) in the middle of the pressure side 4b , 4'b the backing plate 4th , 4 ' arranged and has a width that is approximately a length of the hood 7a is equivalent to.

The reset element 28 includes a spring arm 29 , an attachment portion 29a with a step section 29e and a connection 29f , a connecting section 29b and a contact end 29c with a bent end portion 29d . In addition, the restoring element 28 an operation 30th on which with the fastening portion 29a is firmly connected.

The design and function of the end of the return element 28 with the connecting section 29b , End of contact 29c and end section 29d for contacting the brake carrier 6th is above in connection with the reset element 24 of the fifth embodiment explained.

The spring arm 29 is with its upper end over the step section 29e with the fastening section 29a connected, which in turn has a connection at its upper end 29f has, which is at 90 ° to the insert 30th is angled towards.

The use 30th is here a circular cylindrical body with a coaxial circular cylindrical projection 30a , an outside diameter 30b , an end face 30c , a ring surface 30d running around the ledge 30a is arranged, the projection 30a an outside diameter 30e and a connection area 30f having.

The use 30th and the lead 30a form a common body with a step that emerges from the ring surface 30d is formed because the outer diameter 30e of the protrusion 30a smaller than the outside diameter 30b of use 30th is.

At the connection area 30f of the protrusion 30a is the fastening section 29a with the step section 29e and the connection 29f attached, e.g. welded. Also an area of connection between the upper end of the spring arm 29 and the step section 29e is here with the lead 30a at its connection area 30f firmly connected, e.g. welded.

The reset element 28 of the sixth embodiment is on the brake pad 3 , 3 ' Via pressed-on friction material of the respective friction lining 5 , 5 ' attached. In the sixth embodiment shown, the reset element 28 before the friction material is pressed onto the backing plate 4th , 4 ' from the pavement side 4a , 4'a with the spring arm 29 ahead through a through opening of a recess 4e in the backing plate 4th , 4 ' threaded. By subsequently pressing on the friction material of the friction lining 5 , 5 ' also becomes the reset element 28 attached and secured against twisting. The reset element 28 is designed so that there is the necessary opening of the recess 4e in the backing plate 4th , 4 ' locks.

The insert is in the assembled state 30th with the lead 30a in the recess 4e and a recess coaxial therewith 4f recorded. An inside diameter of the recess 4e is to the outside diameter 30e of the protrusion 30a adapted, with an inner diameter of the recess 4f with the outside diameter 30b of use 30f corresponds. The ring surface 30d of use 30th lies on one shoulder 4g as a step between the recess 4e and the recess 4f on. The friction lining 5 , 5 ' becomes after inserting the reset element 29 on the covering side 4a , 4'a of the backing plate 4th , 4 ' applied, the friction lining 5 , 5 ' the face 30c of use 30th covered and this in the backing plate 4th , 4 ' fixed.

The invention is not restricted by the exemplary embodiments described above. It can be modified within the scope of the attached claims.

For a subsequent installation of the reset device 8th , 8th' with the return elements 15th , 18th , 20th , 22nd , 24 , 26th , 28 can use the corresponding brake pads provided with them 3 , 3 ' used when changing.

Reset elements 15th , 18th , 20th made of round wire or other possible cross-sections are also conceivable, also in combination or additional arrangement.

List of reference symbols

1

Disc brake

2

Brake disc

2a

Brake disc rotation axis

3, 3 '

Brake pad

4, 4 '

Backing plate

4a, 4'a

Facing side

4b, 4'b

Print side

4c

Through opening

4d

Recess

4e

Recess

4f

Recess

4g

shoulder

5, 5 '

Friction lining

6th

Brake carrier

6a

Mounting side

6b, 6'b

Brake carrier horn

6c, 6'c

Bridge connector

6d, 6'd

Contact section

6e, 6'e

Support section

6f

Contour guide

6'g

Contact section

7, 7 '

Pad retaining spring

7a

Hood

8, 8 '

Reset device

9

opening

10

Caliper

11

Application section

11a

Brake pad

12th

Back of the saddle

13th

Tension strut

14th

Pad retainer

15th

Reset element

16

Spring arm

16a

Fastening section

16b

End of contact

16c

Mounting hole

16d

Guide hole

17th

Fastener

17a

Guide pin

18, 20

Reset element

19, 21

Spring arm

19a, 21a

Fastening section

19b, 21b

Crank

19c, 21c

End of contact

19d, 21d

End section

19e, 21e

Mounting hole

19f, 21f

Guide hole

22nd

Reset element

23

Spring arm

23a

Fastening section

23b, 23c

Arch section

23d

End of contact

23e

Mounting hole

23f

Guide hole

24

Reset element

25th

Spring arm

25a

Fastening section

25b

Connection section

25c

End of contact

25d

End section

25e

Step section

25f

Tab section

25g

Mounting hole

26th

Reset element

27

Spring arm

27a

Fastening section

27b

Connection section

27c

End of contact

27d

End section

27e

Step section

28

Reset element

29

Spring arm

29a

Fastening section

29b

Connection section

29c

End of contact

29d

End section

29e

Step section

29f

connection

30th

mission

30a

head Start

30b

outer diameter

30c

Face

30d

Ring surface

30e

outer diameter

30f

Connection area

L.

Longitudinal axis

Q

Transverse axis

S.

main emphasis

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was 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.

Patent literature cited

• DE 102007001213 [0005]
• DE 102012006111 A1 [0007]
• DE 102016117777 [0009]
• DE 102016117777 A1 [0040]

Claims (16)

Disc brake (10) for a commercial vehicle, with a brake disc (2) overlapping, designed as a sliding caliper, which is fastened to a stationary brake carrier (6), two in the brake caliper (1), movable in opposite directions, each with one lining carrier plate (4, 4 ') and brake linings (3, 3') having a friction lining (5, 5 ') fastened thereon, of which an action-side or application-side brake lining (3) is pressed against the brake disc (2 ) can be pressed, as well as at least one restoring device (8, 8 ') with which the brake linings (3, 3') can be returned after a braking-related shifting and releasing of the brake, the restoring device (8, 8 ') at least one on a brake lining (3, 3 ') has attached return element (15, 18, 20, 22, 24, 26, 28), which is arranged between this brake lining (3, 3') and a fixed reference and on the brake lining (3, 3 ' ) a reset raft, characterized in that the at least one return element (15, 18, 20, 22, 24, 26, 28) is designed as a leaf spring element with a spring arm (16, 19, 21, 23, 25, 27, 29) and the The fixed reference is a contact section (6d, 6'd) of the brake carrier (6). Disc brake (10) Claim 1 , characterized in that the at least one restoring element (15, 18, 20, 22, 24, 26, 28) exerts a tensile force as a restoring force on the brake lining (3, 3 ') on which the at least one restoring element (15, 18, 20, 22, 24, 26, 28) is attached. Disc brake (10) Claim 2 , characterized in that the at least one restoring element (15, 18, 20, 22, 24, 26, 28) in the installed state of the associated brake lining (3, 3 ') is prestressed with respect to the contact section (6d, 6'd) of the Brake carrier (6) is arranged. Disc brake (10) Claim 2 or 3 , characterized in that the at least one restoring element (15, 18, 20, 22, 24, 26, 28) has a fastening section (16a, 19a, 21a, 23a, 25a, 27a, 29a) which is connected to the respective spring arm (16 , 19, 21, 23, 25, 27, 29) is attached to a pressure side (4b, 4'b) of a lining carrier plate (4) of the brake lining (3, 3 '). Disc brake (10) Claim 4 , characterized in that the at least one return element (15, 18, 20, 22, 24, 26, 28) on the pressure side (4b, 4'b) of the lining carrier plate (4) of the brake lining (3, 3 ') in the area of a middle friction radius, a center of gravity or in the middle, ie centrally at the point of intersection or in the area of this point of intersection of an imaginary transverse axis (Q) of the brake lining (3, 3 ') and an imaginary longitudinal axis (L) of the brake lining (3, 3') . Disc brake (10) Claim 4 or 5 , characterized in that at least two restoring elements (15, 18, 20, 22, 24, 26, 28) on the pressure side (4b, 4'b) of the lining carrier plate (4) of the brake lining (3, 3 ') in the area of a middle Friction radius symmetrically to an imaginary transverse axis (Q) of the brake lining (3, 3 ') attack or act on two contact areas to the right and left thereof on an imaginary longitudinal axis (L) of the brake lining (3, 3'). Disc brake (10) according to one of the Claims 4 until 6th , characterized in that the at least one return element (15, 18, 20, 22, 24, 26, 28) with its respective fastening section (16a, 19a, 21a, 23a, 25a, 27a, 29a) on the pressure side (4b, 4 'b) the lining carrier plate (4) of the brake lining (3, 3') is attached so that it cannot rotate about an axis which runs parallel to a brake disc axis of rotation (2a) of the brake disc (2). Disc brake (10) Claim 7 , characterized in that an anti-rotation device of the at least one restoring element (24) is formed with a tab section (25f) which is connected to the spring arm (25), the tab section (25f) having two upwardly projecting tabs which Support in a through opening (4c) of the lining carrier plate (4, 4 '). Disc brake (10) Claim 7 , characterized in that the at least one restoring element (26) is secured against rotation by a form fit of the fastening section (27a) connected to the spring arm (27) in a recess (4d) of the lining carrier plate (4, 4) corresponding to the shape of the fastening section (27a) ') of the brake lining (3, 3') is formed, the fastening section (27a) being fastened in the recess (4d), for example by pressing. Disc brake (10) Claim 7 , characterized in that a rotation lock of the at least one reset element (28) is formed on the brake lining (3, 3 ') via pressed-on friction material of the respective friction lining (5, 5'), the reset element (28) having an insert (30) is connected and before the friction material is pressed onto the lining backing plate (4, 4 ') from a lining side (4a, 4'a) of the lining backing plate (4, 4') through a through opening in the lining backing plate (4, 4 '), wherein the insert (30) closes the through opening and is covered by the friction lining (5, 5 ') and is fixed in the lining carrier plate (4, 4'). Disc brake (10) according to one of the preceding claims, characterized in that the spring arm (23) of the at least one restoring element (22) is designed as a curved leaf spring element and is pretensioned on the lining carrier plate (4, 4 ') of the brake lining (3, 3) ') is appropriate. Disc brake (10) according to one of the preceding claims, characterized in that the spring arm (16, 19, 21, 23, 25, 27, 29) of the at least one return element (15, 18, 20, 22, 24, 26, 28) a contact end (16b, 19c, 21c, 23d, 25c, 27c, 29c), portions of this contact end (16b, 19c, 21c, 23d, 25c, 27c, 29c) and / or a portion of the spring arm (16, 19, 21, 23, 25, 27, 29) are in contact with a contact section (6d, 6'd) of the brake carrier (6) in the area of the connection with the contact end (16b, 19c, 21c, 23d, 25c, 27c, 29c) . Disc brake (10) Claim 12 , characterized in that the contact end (16b) has a radius. Disc brake (10) Claim 12 characterized in that the contact end (19c, 21c) is connected to the spring arm (19, 12) via a crank (19b, 21b). Disc brake (10) according to one of the preceding claims, characterized in that at least two restoring elements (15, 18, 20, 22, 24, 26, 28) on the pressure side (4b, 4'b) of the lining carrier plate (4) of the brake lining ( 3, 3 ') are attached, the at least two restoring elements (15, 18, 20, 22, 24, 26, 28) each being designed with a different spring rate. Brake pad set for a disc brake (10) according to one of the preceding claims, characterized in that the brake pad set has an application-side brake lining (3) and a rear-side brake lining (3 '), the application-side brake lining (3) and the rear-side brake lining (3') has at least one restoring element (15, 18, 20, 22, 24, 26, 28) of a restoring device (8, 8 ') which, as a leaf spring element with a spring arm (16, 19, 21, 23, 25, 27, 29) is trained.

Images