DE102018127475A1 - Brake pad holder for a rail vehicle - Google Patents

Abstract

A brake pad holder for a disc brake of a rail vehicle has a pad holder (2) and at least two brake pads (3a, 3b) held in place on the pad holder (2), the pad holder (2) being a pressure plate (21) with a lengthwise direction of the pad holder (2) extending guide channel (22), in which a on a pressure plate (21) facing back (31) of the brake pads (3a, 3b) arranged guide web (32) is slidably held, the guide web (32) one in Moving direction (x) extending receiving channel (5), in which a spring bar (6) is received, the spring bar (6) having a plurality of spring elements (62) which are arranged such that in the inserted into the receiving channel (5) Spring rod (6) a torque perpendicular to the direction of displacement (x) acts on the brake pads (3a, 3b).

Description

The present invention relates to a brake pad holder for a disc brake of a rail vehicle according to the preamble of claim 1.

Brake pads for disc brakes of rail vehicles, such as those from the DE 10 2009 006 290 A1 are known, have a guide web provided on the rear of the brake pad, which is held in a guide channel of a pressure plate of a pad holder. The guide channel and correspondingly the guide web extend in the longitudinal direction of the pad holder.

It is also known to design the brake pads in two parts and to lock two brake pad halves one behind the other to the pad holder. The halves of the brake pads are also referred to below as brake pads for the sake of clarity.

The guide channel and corresponding to the guide web of the respective brake pad is preferably dovetail-shaped in cross section.

As a standard, there is a certain amount of play between the inner surfaces of the guide channel and the outer surfaces of the guide web to compensate for manufacturing tolerances as well as possible thermal expansion and simplified assembly.

Due to vibrations during driving, this play leads to the abovementioned contact surfaces rubbing against each other and thus wear both on the respective contact surfaces of the brake pads and on the pad holder, both on the surfaces of the guide channel and on those of the guide web.

This wear leads to an increase in the play between the guide channel and the guide web, which results in greater movement amplitudes during driving, which increases the wear until the pad holder or a locking latch, which holds the brake pad or the brake pads in the direction of insertion in their functional position, is renewed must become.

In extreme cases, such replacement of the brake pad holder or locking bolt may be necessary before the friction material of the brake pads has reached its wear limit.

Another disadvantage of a gradually increasing play between the guide channel and the guide web is that in the case of a dovetail-shaped guide, the brake pads are held at a greater distance from the pressure plate of the pad holder, since the dovetail-shaped guide webs and the corresponding dovetail-shaped guide channel also move vertically in one direction in the advanced state of wear has an increased play to the surface of the pressure plate.

This can also lead to increased lining wear and, moreover, to premature wear of the brake disk of the disc brake. In addition, undesirable friction noises can arise during driving.

The object of the present invention is to provide a brake pad holder for a disc brake of a rail vehicle, with which the above problems can largely be avoided and with which, in particular, a less wear-prone coupling between the brake pads and the pad holder is made possible.

This object is achieved by a brake pad holder for a rail vehicle with the features of claim 1.

The brake pad holder according to the invention for a rail vehicle has a pad holder and at least two brake pads held in place on the pad holder.

The pad holder has a pressure plate with a guide channel extending in the longitudinal direction of the pad holder, in which a guide web arranged on a rear side of the brake pads facing the pressure plate is slidably held.

The guide web of the brake pads has a receiving channel which extends in the direction of displacement and in which a spring rod is received.

The spring bar has a plurality of spring elements which are arranged such that when the spring bar is inserted into the receiving channel, a torque acts on the brake pads perpendicular to the direction of displacement.

By connecting the two brake pads via such a spring bar and the torque exerted by the spring elements arranged on the spring bar, the guide webs are rotated by a small angle in the guide channel about an axis of rotation oriented perpendicular to the pressure plate, and parts of the side surfaces are thereby pressed against the inner surfaces of the guide channel, which leads to an elimination of the play between the Guide webs and the guide channel in the fully assembled state.

By eliminating this play when the spring rod is inserted in the receiving channel, there is a static friction between the guide webs and the guide channel, which means that there is no relative movement between the guide channel and the guide webs when driving in a non-braking position and the wear is thus significantly reduced.

Advantageous embodiments of the invention are the subject of the dependent claims.

According to an advantageous embodiment variant of the invention, the spring bar has a rod-shaped base body on which the spring elements are arranged on opposite longitudinal sides.

The base body has in particular a polygonal, in particular cuboid cross-section, which facilitates the assembly or molding of spring elements on flat surfaces. In principle, however, a rod-shaped base body with a circular cross section is also conceivable.

According to a further embodiment variant, the spring elements are fastened to the base body, in particular riveted, screwed or locked.

This enables simple replacement of individual spring elements in the event of damage to one of the spring elements.

According to a preferred embodiment variant, the spring elements are designed as leaf springs or spring-loaded rollers. Such leaf springs or spring-loaded rollers are reliable and stable and inexpensive to produce in operation.

According to a further advantageous embodiment variant, the spring elements are arranged alternately on opposite longitudinal sides of the base body of the spring rod, so that two spring elements each abut each receiving channel of the brake pads.

With this arrangement of the spring elements, a torque acts in the same direction on both brake pads.

According to an alternative embodiment variant, respective spring elements are arranged in the region of the ends of the base body of the spring bar on the same long side of the base body of the spring bar and in the center area of the base body of the spring bar, two spring elements are arranged on the opposite long side of the base body of the spring bar.

With this arrangement of the spring elements, the torque acts in the opposite direction.

In order to simplify the dismantling of the spring rod, a tool holder is formed at least in a region of the rear end of the base body in the direction of insertion.

The tool holder can be designed, for example, in the form of a bayonet lock, so that the spring rod can be pulled out of the holder channel of the brake pads in a simple manner after insertion into the tool holder, which eliminates the slight twisting of the guide webs or the brake pads in the guide channel and the brake pads are thereby easily detachable from the pad holder.

In order to minimize the size of the contact surfaces of the two brake pads arranged one behind the other in order to reduce frictional wear, according to a further advantageous embodiment variant, a portion of an end face facing a second edge of the brake pads is adjacent to a peripheral edge of at least one of the brake pads by an angle of less than 2 ° formed angled relative to the remaining end face of the brake pad.

The resulting acute-angled recess in the contact area of the two brake pads reduces the parallelism deviation of the remaining end face.

According to a further advantageous embodiment variant, the width of the angled partial area of the end face perpendicular to the direction of displacement is less than 20% of the total width of the brake pad.

This enables sufficient rotation of the brake pads, while minimizing friction surface loss.

The slight rotation of the brake pads caused by the spring bar relative to the pressure plate of the pad holder leads, in the case of a dovetail-shaped guide web and guide channel, to the brake pads always being pressed in the direction of the pressure plate of the pad holder, since the pressure force on which the torque is based is pressed against the inclined inner surfaces of the Guide channel also cause a force that pushes the brake pad in the direction of the pressure plate.

Preferred exemplary embodiments are explained in more detail below with reference to the accompanying drawings. Show it:

• 1 eine perspektivische Darstellung eines Belaghalters einer Bremsbelaghalterung für ein Schienenfahrzeug mit zwei daran arretiert gehaltenen Bremsbelägen,
• 2 eine perspektivische Darstellung der Bremsbeläge mit Darstellung von an den Bremsbelägen angeordneten Führungsstegen und in den Führungssteg eingebrachtem Aufnahmekanal,
• 3 eine perspektivische Darstellung einer Ausführungsvariante eines Federstabs,
• 4 eine perspektivische Explosionsdarstellung des in 3 gezeigten Federstabs,
• 5 eine Schnittansicht durch die in 1 dargestellte Bremsbelaghalterung zur Darstellung der Zusammenwirkung zwischen Führungskanal, Führungssteg und Federstab,
• 6 eine Schnittdarstellung durch eine Ebene parallel zur Andruckplatte auf Höhe des Führungskanals und des Führungssteges,
• 7 eine Draufsicht auf die Bremsbeläge gemäß 2,
• 8 eine Draufsicht auf einen Federstab mit wechselseitig angeordneten Federelementen und
• 9 eine schematische Draufsicht auf einen Federstab mit einer alternativ ausgeführten Anordnung der Federelemente.

Show it:

• 1 1 shows a perspective view of a pad holder of a brake pad holder for a rail vehicle with two brake pads held thereon,
• 2nd 2 shows a perspective view of the brake linings with the representation of guide webs arranged on the brake linings and receiving channel introduced into the guide web,
• 3rd 2 shows a perspective illustration of an embodiment variant of a spring bar,
• 4th an exploded perspective view of the in 3rd spring rod shown,
• 5 a sectional view through the in 1 Brake pad holder shown to illustrate the interaction between the guide channel, guide bar and spring rod,
• 6 2 shows a sectional illustration through a plane parallel to the pressure plate at the level of the guide channel and the guide web,
• 7 a top view of the brake pads according to 2nd ,
• 8th a plan view of a spring bar with mutually arranged spring elements and
• 9 is a schematic plan view of a spring bar with an alternative arrangement of the spring elements.

In the following description of the figures, terms such as top, bottom, left, right, front, rear, etc. refer exclusively to the exemplary representation and position of the pad holder, pressure plate, brake pad, guide channel, guide bar, spring bar and the like selected in the respective figures. These terms are not to be understood as restrictive, i.e. these references can change due to different working positions or the mirror-symmetrical design or the like.

In 1 An embodiment variant of a brake pad holder according to the invention for a rail vehicle is shown.

The brake pad holder has a pad holder known per se from the prior art 2nd on, with a brake lever bearing 24th for mounting a brake lever, a pressure plate 21 , on whose the brake lever bearing 24th bottom facing away in the longitudinal direction of the pad holder 2nd extending guide channel 22 is molded.

In this guide channel 22 are management bridges 32a , 32b of two brake pads 3a , 3b kept slidable.

The two brake pads 3a , 3b are shaped here so that they also serve as brake pad halves of a brake pad 3rd could be called. It would also be conceivable here instead of two brake pad halves to have three or more brake pad parts in a row in the guide channel 22 to arrange or a two-part brake pad not in the middle, but in a larger, i.e. in the direction of displacement x longer, and a smaller one, i.e. in the direction of displacement x split shorter section. Therefore, the “two-part brake pads” shown in the exemplary embodiments, consisting of two brake pad halves, are generally referred to below as brake pads.

The boardwalks 32 are on the pressure plate 21 facing back 31a , 31b the brake pads 3a , 3b arranged. The boardwalks 32 are preferably made of the friction lining material of the brake lining 3rd on the back of the respective brake pad facing away from the friction surface 3a , 3b molded.

It is also conceivable for the guide webs to be separate components in the friction lining material of the respective brake lining 3a , 3b pour or otherwise fix.

As in 2nd is shown are the guide bars 32 in the preferred embodiment variant shown here of a carrier plate 4th encased what the reinforcement of the guide bar 32 serves.

As in 2nd and 5 further shown is the guide bridge 32 and accordingly the guide channel 22 dovetail shaped, the width of the guide bar 32 to the pressure plate 21 in a direction z perpendicular to the friction surface of the brake pads 3a , 3b increases.

As in 2nd further shown, the guide web 32 one in the direction of displacement x extending receiving channel 5 on in which a spring rod 6 is recorded.

The spring rod 6 points like in the 2nd to 4th shown several spring elements 62 on, which are arranged so that in the receiving channel 5 inserted state of the spring bar 6 a torque perpendicular to the direction of displacement x on the brake pads 3a , 3b works.

As in the 3rd and 4th shown, the spring rod 6 a rod-shaped body 61 on. The spring elements 62 are at each other opposite long sides of the rod-shaped base body 61 arranged.

In the preferred embodiment shown here are the spring elements 62 on the main body 61 with rivets 64 fixed.

Other means for fastening the spring elements are also conceivable 62 on the main body 61 of the spring bar 6 , such as screws or a latch or the like.

The spring elements 62 are preferably designed as leaf springs, as in 3rd and 4th is shown. Other configurations of spring elements such as spring-loaded rollers are also conceivable.

The recording channel 5 is preferably U-shaped, as exemplified in 5 is shown. The carrier plate is preferred here 4th that the guide bars 32 encased, with a central U-shaped bulge, in the spring bar 6 lies in the assembled state.

As in 5 what is also recognizable is the width of the guide web 32a , 32b slightly smaller than the width of the guide channel 22 in the pad holder 2nd so that for installing the brake pads 3a , 3b , where first the brake pad 3b with his boardwalk 32 in the guide channel 22 in the pressure plate 21 of the pad holder 2nd is inserted, then the second brake pad 3a with his boardwalk 32 in the guide channel 22 is introduced, the insertion or insertion of the guide bars 32 the brake pads 3a , 3b can be done in a simple manner.

To prevent undesired movement of the guide bars during driving 32 in the guide channel 22 To prevent, the spring rod is connected 6 in the receiving channel in the middle of the guide bars 5 inserted.

Due to the arrangement of the spring elements as described above 62 of the spring bar 6 are the two brake pads 3a , 3b coupled in such a way that via the spring bar 6 a torque on the brake pads 3a , 3b works. This torque leads to the brake pads 3a , 3b can be rotated slightly about an axis of rotation extending in the z direction and thereby the guide webs 32 partially, especially linear, on the guide channel 22 apply under static friction, which leads to the brake pads under normal driving conditions in the non-braking state 3a , 3b not relative to the guide channel 22 to move back and fourth.

The minimum twisting of the brake pads 3a , 3b within the guide channel 22 can by different arrangements of the spring elements 62 on the main body 61 of the spring bar 6 respectively.

So in the 3rd , 6 , 7 and 8th an arrangement of the spring elements 62 on the main body 61 of the spring bar 6 shown in which the spring elements 62 alternately on opposite longitudinal sides of the base body 61 of the spring bar 6 are arranged so that on each receiving channel 5 the brake pads 3a , 3b two spring elements each 62 issue.

So points in the 3rd and 4th spring rod shown 6 a total of four such spring elements 62 on.

A configuration with, for example, six or eight spring elements would also be conceivable here, provided that not only two brake pads, but, as explained above, three or four brake pads in a row in the guide channel 22 of the pad holder 2nd would have been inserted. It is important that the spring elements are arranged so that each of the brake pads 3a , 3b a torque is applied.

At the in 9 shown arrangement of the spring elements 62 on the main body 61 of the spring bar 6 are respective spring elements 62 in the area of the ends of the base body 61 of the spring bar 6 on the same long side of the body 61 of the spring bar 6 arranged.

Furthermore, are in the central area of the main body 61 two spring elements 62 on the opposite long side of the body 61 of the spring bar 6 arranged.

The basic body 61 of the spring bar 6 has in the preferred embodiment shown in the figures a polygonal, here cuboid cross-section. Other cross-sectional configurations of the base body are also conceivable 61 .

Due to the dovetail design of the guide channel 22 and the guide bars 32a , 32b act the reaction forces of the spring elements 62 also in the vertical direction z, so that due to the slight twisting of the brake pads 3a , 3b the backside 31a , 31b the brake pads 3a , 3b also always in the direction of the pressure plate 21 of the pad holder 2nd be pressed.

In the in the 3rd , 6 and 7 shown arrangement of the spring elements 62 on the spring bar 6 that cause the brake pads to twist 3a , 3b leads in the same direction, which also remain after insertion into the guide channel 22 end faces lying against each other 34a , 34b the brake pads 3a , 3b parallel or almost parallel to each other, so that large areas of the end faces are in contact with each other.

To reduce this contact area, as in 2nd and 7 shown one on a circumferential edge 33a , 33 at least one of the brake pads 3a , 3b adjacent sub-area 35a , 35b one the second of the brake pads 3b , 3a facing end face by an angle α , which is preferably less than 2 °, compared to the rest of the end face 34a , 34b of the brake pad 3a , 3b angled.

This bend preferably does not extend over the entire width in the direction y of the brake pads 3a , 3b , but the width of the angled section 35a , 35b the front surface of the brake pads 3a , 3b is preferably less than 20% of the total width of the brake pads 3a , 3b .

The bend can only on one of the brake pads 3a , 3b be molded. It is also conceivable to provide both brake pads with such a bend in a mirror-image configuration.

To facilitate disassembly of the spring bar 6 from the recording channel 5 is at least at one end of the spring bar 6 , at least the rear end in the insertion direction, which in the installed state near the locking latch 25th is positioned, a tool holder 63 molded.

This tool holder 63 is preferably designed as a bayonet catch recess, so that a correspondingly shaped tool with an angled end can be easily inserted into the tool holder 63 is insertable and so the spring bar 6 from the recording channel 5 can be pulled out.

Such a tool holder is preferably at both ends of the base body 61 of the spring bar 6 provided what the installation of the spring rod 6 in the opposite orientation.

This enables a rotation of the direction of action of the spring elements 62 exerted torque, so that the contact surfaces between the guide channel 22 and the boardwalks 32a , 32b also on the opposite side of the guide channel 22 or the guide bars 32a , 32b changes, which contributes to a further reduction in wear.

The angle of rotation of the brake pads 3a , 3b in the inserted state of the spring bar 6 into the recording channel 5 is preferably about 0.35 °.

Reference list

2nd

Pad holder

21

Pressure plate

22

Guide channel

23

bottom

24th

Brake lever bearing

24th

Pivot bearing

25th

Locking latch

26

Pivot bearing

3rd

Brake pad

3a

Brake pad

31a

back

32a

Boardwalk

33a

circumferential edge

34a

Face

35a

Subarea

3b

Brake pad

31b

back

32b

Boardwalk

33b

circumferential edge

34b

Face

35b

Subarea

4th

Carrier sheet

5

Recording channel

6

Spring rod

61

Basic body

62

Spring element

63

Tool holder

64

rivet

α

angle

x

Direction of displacement

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included for better information for 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 102009006290 A1 [0002]

Claims (12)

Brake pad holder for a disc brake of a rail vehicle, comprising - a pad holder (2), - at least two brake pads (3a, 3b) held in place on the pad holder (2), - the pad holder (2) being a pressure plate (21) with a lengthwise direction of the pad holder (2) extending guide channel (22), in which a guide web (32a, 32b) arranged on a rear side (31a, 31b) of the brake pads (3a) facing the pressure plate (21) is slidably held, characterized in that that the guide web (32) has a receiving channel (5) which extends in the displacement direction (x) and in which a spring bar (6) is received, - the spring bar (6) has a plurality of spring elements (62) which are arranged in this way, that when the spring rod (6) is inserted in the receiving channel (5), a torque acts on the brake pads (3a, 3b) perpendicular to the direction of displacement (x). Brake pad holder after Claim 1 , characterized in that the spring rod (6) has a rod-shaped base body (61) on which the spring elements (62) are arranged on opposite longitudinal sides. Brake pad holder after Claim 2 , characterized in that the spring elements (62) are attached to the base body (61), in particular riveted, screwed or locked. Brake pad holder according to one of the preceding claims, characterized in that the spring elements (62) are designed as leaf springs or spring-loaded rollers. Brake pad holder according to one of the preceding claims, characterized in that the spring elements (62) are arranged alternately on opposite longitudinal sides of the base body (61) of the spring bar (6), so that on each receiving channel (5) of the brake pads (3a, 3b) in each case two spring elements (62) rest. Brake pad holder according to one of the preceding claims, characterized in that respective spring elements (62) in the region of the ends of the base body (61) of the spring bar (6) on the same long side of the base body (61) of the spring bar (6) and in the central area of the base body ( 61) of the spring bar (6), two spring elements (62) are arranged on the opposite longitudinal side of the base body (61) of the spring bar (6). Brake pad holder according to one of the preceding claims, characterized in that the base body (61) has a polygonal, in particular cuboid cross-section. Brake pad holder according to one of the preceding claims, characterized in that a tool holder (63) is formed at least in a region of the rear end of the base body (61) in the direction of insertion. Brake pad holder according to one of the preceding claims, characterized in that a partial region (35a, 35b) adjacent to a peripheral edge (33a, 33b) of at least one of the brake pads (3a, 3b) surrounds an end face facing a second one of the brake pads (3b, 3a) an angle (α) of less than 2 ° relative to the remaining end face (34a, 34b) of the brake lining (3a, 3b) is angled. Brake pad holder after Claim 9 , characterized in that the width of the angled portion (35a, 35b) of the end face perpendicular to the direction of displacement (x) is less than 20% of the total width of the brake pad (3a, 3b). Brake pad holder according to one of the preceding claims, characterized in that the guide web (32) of the brake pads (3a, 3b) and the guide channel (22) are dovetail-shaped in cross section. Brake pad holder according to one of the preceding claims, characterized in that the guide web (32) of the brake pads (3a, 3b) is at least partially encased by a carrier plate (4).

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