Brake application device for disc brake

Abstract

The invention relates to a brake application device for a disc brake of a utility vehicle, having a deflectable brake lever which is supported on one side on an inner wall of a brake caliper and on the other side indirectly on a bridge (8) carrying at least one brake piston which is arranged movably in the brake caliper, for which purpose a roller device which is torsion-resistant and movement-resistant against the bridge (8) is provided between the brake lever and the bridge (8), the roller device being configured such that the bridge (8) and at least one roller (9) of the roller support device are connected by at least one fixing element (13).

Description

Technical Field

[0001] This invention relates to a braking application device for a disc brake used in commercial vehicles. Background Technology

[0002] When braking, this braking application device, which is part of the disc brake, can press the brake pads against the brake disc on the vehicle side.

[0003] Here, the operation of the braking device is pneumatically or electromechanically performed in cooperation with a deflectable brake lever, which is supported on one side on the inner wall of the brake caliper and on the other side on a movable bridge. For this purpose, a roller support device in the form of rollers fixed axially and radially between the brake lever and the bridge is provided.

[0004] To support the rollers, a bearing is constructed in the brake lever, which is coated with a suitable plastic, thus forming what is known as the DU support device.

[0005] To support the rollers, a modified molded component is mounted on the bridge frame. This molded component is used to radially and axially fix the rollers and serves as a cage return member for the rolling bearing via a shaped shoulder, such as a tab or similar object. The brake lever is smoothly supported on the inner wall of the brake caliper by means of this cage return member. Such a brake application device is known from DE10307734B3.

[0006] However, operational experience has shown that the current methods for securing the rollers to prevent axial movement are insufficient, potentially leading to breakage of the connecting pieces. Since the possible consequence is brake failure that is not externally detectable, this is certainly an unacceptable safety risk.

[0007] Furthermore, the freely rotating support of the rollers often leads to wear of particles entering the DU bearings of the brake lever, which particularly adversely affects the service life of the DU bearings.

[0008] To provide a remedy here, DE102014108500A1 proposes holding the rollers to the bridge in a torsional and displacement-resistant manner. To this end, corresponding forming areas are provided on the bridge and the rollers, for example as flattening portions on the rollers, which abut against the support surface of the bridge.

[0009] This structure has been functionally proven. However, problems may arise when assembling disc brakes, especially the brake application device, because the rollers exist as loose parts before assembly, which makes assembly difficult, since fixing them before the final position can only be achieved with the corresponding manufacturing costs, that is, with the aid of assembly aids.

[0010] In addition, both the design of the rollers and the bridge are relatively expensive because the flattening part of the rollers and the support surface of the bridge are constructed as planes, which can only be achieved through relatively expensive machining. Summary of the Invention

[0011] The objective of this invention is to further improve this type of braking application device so that its service life is improved by structurally simple means and its assembly is made simpler.

[0012] This task is accomplished using a braking application device.

[0013] According to the design of the present invention, the brake application device is in the form that at least one roller is generally connected to the bridge via a fixing element, which ensures not only the fixation of the roller relative to the bridge in the axial, radial, and torsional directions in the installation position of the brake application device, but also the fixation before installation into the brake caliper. That is, the bridge and roller can be pre-assembled and used as a structural unit without the need for special assembly measures to install the roller, which is known in the prior art as a device that is loose relative to the bridge.

[0014] The disc brake (whose main functional components are the brake application devices) is manufactured in large quantities as a mass-produced product, so the significant assembly simplification feasible by the design scheme according to the invention is particularly important in terms of cost minimization.

[0015] Furthermore, the advantage of this invention is that it eliminates the need for molded parts that are fixed to the cable tray as known to date, which also contributes to cost optimization.

[0016] In this sense, it can also be noted that the use of hardened steel for manufacturing rollers can now be abandoned, which has so far been derived from the friction pair steel / steel between the molded parts that form the bearing and the roller.

[0017] The at least one fixing element is held in a locking or friction-locking manner on the cable tray and the roller, wherein, according to another concept of the invention, the application of a clamping sleeve is particularly advantageously shown, which is inserted not only into the hole of the cable tray but also into the hole of the roller and is held therein in a friction-locking manner.

[0018] Such clamping sleeves are available in trade as standard parts and are therefore particularly cost-effective. For tolerance compensation, one of the holes, i.e., the hole in the cable tray or the hole in the roller, can be constructed as an elongated hole with a very small size.

[0019] However, in principle, the introduction of the hole is also very simple and can be manufactured at a significantly lower cost compared to the flattening portion of the roller described in the prior art on the one hand and the flattening portion of the bridge on the other hand.

[0020] Instead of clamping sleeves, retaining pins can be inserted into the corresponding prepared holes, where these retaining pins are also frictionally locked in the cable tray or rollers.

[0021] As another variation of the fixing element, holes can be provided in the cable tray, and two coaxially oriented rollers, arranged at a distance from each other, serving as roller support devices, can be pressed into the holes with their opposite ends. Here, the distance between the rollers, i.e., the resulting gap, is determined in such a way that the rollers can be inserted without any problems.

[0022] The perforations are also suitably formed onto a bridge made of cast iron. This implementation variation also ensures reliable retention of the rollers, i.e., resistance to torsion and movement.

[0023] Furthermore, the fixing element may be composed of a sheet metal piece that is pressed into both the groove of the support portion of the bridge frame and the groove of the roller, wherein the sheet metal piece extends in the pivoting direction of the brake lever. Attached Figure Description

[0024] The embodiments of the present invention will now be described with reference to the accompanying drawings.

[0025] In the attached diagram:

[0026] Figure 1 shows a cross-section of a schematic structure of a disc brake equipped with a brake application device according to the prior art.

[0027] Figure 2 The details of the disc brake according to the invention are shown in perspective view.

[0028] Figure 3 Showing according to Figure 2 Detailed cross section of line III-III in the middle,

[0029] Figure 4 The bridge of the brake application device is shown in perspective view.

[0030] Figure 5 Another embodiment of the braking application device according to the present invention is illustrated in the diagram.

[0031] Figure 6 Showing according to Figure 5 According to the line VI-VI in the middle Figure 5 A cross-section of the braking application device.

[0032] Figure 7 Another variation of the braking application device according to the invention is also shown in perspective.

[0033] Figure 8 Another embodiment of the invention is shown in a longitudinal sectional view. Detailed Implementation

[0034] Figure 1 shows a cross-section of a disc brake for a commercial vehicle according to the prior art. The disc brake has a brake disc 3, which is fixed to an axle (not shown) of the commercial vehicle and surrounded by a brake caliper 1, which is movable toward the brake disc 3.

[0035] A brake application device 2 is arranged in the brake caliper 1, which can press the brake pads 4 onto the brake disc 3 when the brake is triggered by a brake cylinder that is preferably pneumatically operated.

[0036] The braking application device 2 acts on brake plungers (not shown) arranged in parallel and spaced apart from each other in the bridge 8, configured to adjust the main shaft.

[0037] The brake lever 5 of the brake application device 2 is in operative connection with the brake cylinder 6. When operated, the brake lever can pivot toward the brake disc 3 around the roller 9 that extends parallel to the plane of the brake disc 3.

[0038] On the side opposite to roller 9, brake lever 5 rests against roller 11, which is held in a retainer. The roller is supported on one side on brake lever 5, which is configured as an eccentric wheel 7 in the region, and on the other side on the inner wall of brake caliper 1.

[0039] Roller 9, which is part of the roller support device, serves as a rotary bearing for brake lever 5 and is located in bearing shell 10 of eccentric wheel 7. Here, bearing shell 10 also matches the cross-sectional profile of roller 9 in cross-section, such as concave groove 12, in which roller 9 is placed on the other side.

[0040] Figures 2 to 8 A variant of the braking application device 2 is shown, which, according to the invention, has at least one fixed element connected to the bridge 8 and the roller 9.

[0041] exist Figures 2 to 4 The cable tray 8 is depicted in detail as a brake application device 2. In this example, the fixing element is composed of a clamping sleeve 13, which is inserted into not only the hole 14 of the cable tray 8 but also the hole 14 of the roller 9 in the region of the groove 12 and is held therein in a frictional locking manner.

[0042] exist Figure 5 and Figure 6 In the variant shown, two coaxially oriented rollers 9 are connected to the bridge 8 via the fixing element, wherein the two rollers 9 are arranged spaced apart from each other with a gap. In this example, the fixing element is also configured as a clamping sleeve 13.

[0043] exist Figure 7 Another design of the brake application device 2 according to the invention is shown. A bridge frame 8 with two rollers 9 can be seen, these rollers being pressed into and frictionally locked in the eyelets 15 of the bridge frame 8 with their oppositely spaced end regions. These eyelets 15 are integral parts of the bridge frame 8, meaning they are formed together during the manufacture of the bridge frame 8.

[0044] at last, Figure 8 Another embodiment of the invention is given here, wherein a plate member 16 is provided as a fixing element, which is pressed into the groove 17 of the bridge frame 8 on one side and into the groove 17 of the roller 9, thereby establishing a friction-locking connection.

[0045] List of reference numerals

[0046] 1 brake caliper

[0047] 2 Braking Application Device

[0048] 3 brake discs

[0049] 4 Brake pads

[0050] 5 Brake levers

[0051] 6 brake cylinders

[0052] 7 Eccentric Wheel

[0053] 8 cable trays

[0054] 9 rollers

[0055] 10 bearings

[0056] 11 Rolling bodies

[0057] 12 trenches

[0058] 13 Clamping Sleeve

[0059] 14 holes

[0060] 15-hole eye

[0061] 16 sheet metal parts

[0062] 17 slots

Claims

1. A brake application device for a disc brake in a commercial vehicle, the brake application device having a deflectable brake lever (5) supported on one side on the inner wall of a brake caliper (1) and indirectly supported on the other side on a bridge (8) movably arranged in the brake caliper (1) carrying at least one brake plunger, wherein a torsional and non-moving roller support device is provided between the brake lever (5) and the bridge (8), characterized in that, The bridge (8) and at least one roller (9) of the roller support device are connected by at least one fixing element.

2. The braking application device for the disc brake according to claim 1, characterized in that, The fixing element is held in the bridge (8) and the roller (9) in a form-locking and / or friction-locking manner.

3. The braking application device for the disc brake according to claim 1, characterized in that, The fixing element is composed of a clamping sleeve (13) or a fixing pin, which is pressed into the hole (14) of the bridge (8) and the roller (9).

4. The braking application device for a disc brake according to any one of claims 1 to 3, characterized in that, The fixing element is made of a plate component (16) which is pressed into the corresponding grooves (17) of the bridge (8) and the roller (9).

5. The braking application device for a disc brake according to any one of claims 1 to 3, characterized in that, Two rollers (9) are provided, which are coaxially oriented and arranged at a distance from each other.

6. The brake application device for a disc brake according to claim 5, characterized in that, Each of the two rollers (9) is pressed into the eyelet (15) of the bridge frame (8).

7. The brake application device for a disc brake according to claim 6, characterized in that, The eyelet (15) is formed onto the cable tray (8).

8. The braking application device for a disc brake according to claim 6, characterized in that, The eyelet (15) is located at the opposite ends of the two rollers (9).

9. The braking application device for a disc brake according to any one of claims 1 to 3, characterized in that, The at least one roller (9) and the bridge (8) are pre-assembled as structural units.

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