Brake pad holder of a disc brake

Abstract

Brake pad holder of a disc brake for a commercial vehicle, wherein brake pads (2) assigned to both sides of a brake disc, each having a pad carrier plate (11) and a friction lining (12), are held by means of a pad retaining spring (4) in a pad recess (3') of a stationary brake carrier (1) bounded by opposing brake carrier horns (3), characterized in that each pad retaining spring (4) spanning the longitudinal extent of the assigned brake pad (2) is positively connected at its end, outside the pad recess (3'), to the brake carrier (1) and bears against the pad carrier plate (11).

Description

[0001] The invention relates to a brake pad holder of a disc brake according to the preamble of claim 1.

[0002] Such brake pad holders are well known, for example from DE 40 20 287 A1.

[0003] To secure the position of the two brake pads, each is equipped with a pad retaining spring. This spring is designed as a leaf spring and is attached to the brake pad in the upper edge area facing a brake caliper mounting opening. It is held under preload by a pad retaining bracket extending transversely to the brake pad, i.e., in the axial direction of the brake disc. The pad retaining spring is secured in two opposing areas of the brake caliper that border the mounting opening.

[0004] The positioning of the brake pads under preload is intended to compensate for tolerances as well as to reduce or prevent the occurrence of rattling noises that otherwise occur when the vehicle is in operation.

[0005] However, the current brake pad mounting system does not adequately meet this requirement. For the brake pads to be mountable, a tolerance of approximately 5 to 6 mm must be taken into account.

[0006] This tolerance determines the spring travel of the pad retaining springs, which in turn influences the preload of the pad retaining springs. This means that the greater the spring travel, the lower the preload of the pad retaining spring.

[0007] Especially during driving, where considerable vibrations can occur due to, for example, uneven road surfaces, the preload of the pad retaining springs is insufficient, so that bottoming out of the brake pads and thus rattling is unavoidable.

[0008] In addition to these purely functional disadvantages, there are also difficulties in the manufacture of the known brake pad retainers. For example, appropriate designs of the brake pads are required to secure the pad retaining springs, e.g., in the form of tabs on a pad carrier plate, as shown and described in the cited literature.

[0009] The use of the pad retaining bracket is also indispensable, which naturally results in cost disadvantages, especially since this pad retaining bracket must meet functional requirements with regard to its design and thus its production.

[0010] From DE 24 17 612 C2 a brake pad holder is known in which the bistable pad retaining spring is held at the end in grooves of opposite boundary walls of a pad shaft provided in the brake calliper.

[0011] DE 38 39 957 A1 discloses a brake pad holder with a pad retaining spring which is firmly connected, for example by riveting, to a pad carrier plate and whose end legs are supported on projections which are supported on the inner sides of a pad shaft of the brake calliper.

[0012] In a brake pad holder shown and described in US 3 298 469 A, the pad retaining spring is connected to a brake caliper at both ends by screwing.

[0013] DE 100 31 808 A1 deals with a brake pad holder in which, contrary to the generic type, a pad retaining spring is provided for each end region of the brake pad assigned to the respective brake carrier horn, which is held by means of a fastening bolt pressed into a bore in the brake carrier horn.

[0014] Deviating from the generic type, DE 10 2006 007 017 A1 discloses a brake pad retainer in which two pad retaining springs are provided for spring-loaded pretensioning of the brake pad. These two pad retaining springs are arranged spaced apart from one another and are each held positively at one end to the brake caliper and positively at the other end to the pad carrier plate. For this purpose, notches are provided in each case into which the hook-shaped, bent ends of the pad retaining springs, designed as leaf springs, engage.

[0015] The invention is based on the object of further developing a brake pad holder of the generic type in such a way that the overall functionality is improved with little effort in terms of design and manufacturing technology.

[0016] This object is achieved by a brake pad holder having the features of claim 1.

[0017] While with conventional brake pad retainers, the achievable preload of the pad retaining spring depends on the distance between the brake pads inserted into the pad wells of the brake carrier and the retaining bracket, and therefore, as described, a relatively large spring travel must be overcome, now practically only the tolerance between the respective brake pad and the brake carrier needs to be compensated for as the spring travel. This maximum play is reduced to only about 1.5 mm, which naturally results in a significantly increased preload force of the pad retaining spring, which is sufficient in any case to absorb vibrations occurring during driving in such a way that the aforementioned rattling is avoided, especially since the use of a pad retaining bracket, which, in conjunction with the impacting brake pad, generates the noise, can be dispensed with in principle.

[0018] A pad retaining bracket can still be installed, but this only serves as a loss protection in the event of a breakage of the pad retaining spring.

[0019] The limited functional requirements of the pad retaining bracket allow a design that is exclusively adapted to this, i.e. the pad retaining bracket can be manufactured as an extremely cost-effective component in terms of its shape and properties.

[0020] According to an advantageous development of the invention, the pad retaining spring assigned to the action-side brake pad of a sliding caliper disc brake is dimensioned in its width such that it is held down even in the event of a wear-related maximum displacement of the brake pad, wherein the pad retaining spring, as before, rests on a pad carrier plate of the brake pad to which a friction pad is attached.

[0021] In contrast, the pad retaining spring associated with the reaction-side brake pad can be narrower.

[0022] A further concept of the invention proposes to design the pad retaining spring as a leaf spring, with a pressure bar formed approximately in the middle of the longitudinal extension, which rests against the pad carrier plate. The spring effect is essentially the result of the shape of the pressure bar.

[0023] The invention is also characterized by the fact that the pad retaining spring is very easy to install.

[0024] For this purpose, after inserting the respective brake pad, the pad retaining spring can be hooked into the brake carrier, for which purpose the ends of the pad retaining spring are shaped accordingly and engage positively in recesses in the brake carrier or the brake carrier horns.

[0025] The recesses themselves in the brake carrier horns can be incorporated directly during production, for example if the brake carrier is manufactured as a cast part.

[0026] Further advantageous embodiments of the invention are characterized in the subclaims.

[0027] Embodiments of the invention are described below with reference to the accompanying drawings.

[0028] They show: Fig. 1 and Fig. 2 each an embodiment of a brake pad holder according to the invention in a side view Fig. 3 the brake pad holder Fig. 2 in a perspective top view.

[0029] The figures show a brake pad holder of a disc brake for commercial vehicles, with a brake carrier 1 which can be fastened to the vehicle and in which two brake pads 2 are placed.

[0030] For this purpose, the brake carrier 1 has a lining shaft 3' ( Fig. 3) in which the associated brake pad, which furthermore consists of a pad carrier plate 11 and a friction pad 12 attached thereto, is movably mounted.

[0031] To compensate for tolerances and to avoid the occurrence of rattling noises, each brake pad 2 is assigned a pad retaining spring 4, which is designed as a leaf spring and which, according to the invention, is connected at the end to the brake carrier 1.

[0032] For this purpose, in the brake carrier horns 3 according to the embodiment according to Fig. 1 recesses 7 are provided on the outside, into which the ends of the pad retaining spring 4, designed as hooks 6, engage in a form-fitting manner.

[0033] The recesses 7 are designed to be open so that the hooks 6 can be easily inserted.

[0034] In the central region of the pad retaining spring 4, relative to its longitudinal extent, a pressure bar 5 is formed on the otherwise convexly shaped pad retaining spring 4. This pressure bar extends in the direction of the brake pad 2 and is connected to the convex region by two mutually inclined legs. The pressure bar rests on the brake pad 2, i.e., on its pad carrier plate 11.

[0035] In the Fig. In the example shown in Figure 1, the pad retaining spring 4 is designed as a leaf spring, i.e., it consists of a spring plate over its entire extent, including the hooks 6.

[0036] In the Fig. 2 and Fig. 3, only a central portion of the pad retaining spring 4 is designed in the sense of a leaf spring, while the attachment to the pad carrier horns 3 is effected via spring clips 8, which have two parallel and spaced-apart legs made of wire, which are angled at the ends to form stubs 10, each of which is inserted into a hole 9 of the corresponding brake carrier horn 3.

[0037] The central leaf spring section also has a pressure bracket 5 supported on the lining carrier plate 11.

[0038] By using the two spring clips 8, the spring action is limited to the central area, i.e. the leaf spring. Its width is comparable to that shown in the example from Fig. 1.

[0039] Instead of the holes 9 into which the stubs 10 of the spring clips 8 are inserted, the receptacles can also be designed as recesses 7, in which case the spring clips 8 do not merge into angled stubs, but are closed at the ends. List of reference symbols 1 brake carrier 2 brake pads 3 brake carrier horn 3' covering shaft 4 pad retaining spring 5 pressure brackets 6 hooks 7 Recess 8 spring clips 9 holes 10 stumps 11 Pad carrier plate 12 Friction lining

Claims

[1] Brake pad holder of a disc brake for a commercial vehicle, wherein brake pads (2) assigned to both sides of a brake disc, each having a pad carrier plate (11) and a friction pad (12), are held by means of a pad retaining spring (4) in a pad shaft (3') of a stationary brake carrier (1) delimited by opposing brake carrier horns (3), characterized by that each pad retaining spring (4) spanning the associated brake pad (2) in its longitudinal extent is positively connected to the brake carrier (1) at the end, outside the pad shaft (3'), and rests against the pad carrier plate (11). [2] Brake pad holder according to claim 1, characterized by that at least one central region of the pad retaining spring (4), relative to the longitudinal extent of the pad retaining spring (4), is designed as a leaf spring. [3] Brake pad holder according to claim 1 or 2, characterized bythat the central region has a molded pressure bracket (5) extending in the direction of the brake pad (2). [4] Brake pad holder according to claim 3, characterized by that the pressure bracket (5) rests on the brake pad (2). [5] Brake pad holder according to claim 3, characterized by that the pressure bracket (5) is connected to the otherwise convexly shaped pad retaining spring (4) by means of two oppositely extending legs. [6] Brake pad holder according to one of the preceding claims, characterized by that the pad retaining spring (4), which is formed entirely from a spring plate, has hooks (6) formed on the ends which fit positively into open recesses (7) of the brake carrier (1). [7] Brake pad holder according to claim 2, characterized bythat a spring clip (8) which is fastened to the brake carrier (1) is connected to the leaf spring of the pad retaining spring (4) formed in the central area on both sides. [8] Brake pad holder according to claim 7, characterized by that the spring clip (8) has two legs running parallel and spaced apart from one another, which in the fastening area with the brake carrier (1) are each designed as stubs (10) directed towards one another, which engage in holes (10) in the brake carrier (1). [9] Brake pad holder according to claim 6 or claim 8, characterized by that the recesses (7) or the holes (9) are provided in the brake carrier horns (3). [10] Brake pad holder according to one of the preceding claims, characterized bythat the pad retaining spring (4) assigned to an action-side brake pad (2) of a sliding calliper disc brake corresponds in its width at least to the width of a pad carrier plate (11) of the brake pad (2) added by the maximum displacement path.

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