Floating-caliper disc brake

Abstract

A floating-caliper disc brake of a utility vehicle includes a brake disc, a brake carrier spanning the brake disc and having lining shafts arranged on both sides of the brake disc, a brake caliper overlapping the brake disc and movable relative to the brake carrier, brake linings arranged on both sides of the brake disc in a lining shaft of the brake carrier, and having a lining carrier plate and a friction lining attached thereto. An application-side brake lining can be pressed against the brake disc by an application device and a reaction-side brake lining can be pressed against the brake disc by a brake caliper back, by moving the brake caliper. The brake caliper can be reset by a resetting device along a wear adjustment path in an axial direction to the axis of rotation of the brake disc. With the same volume of the friction linings in the new condition, the friction lining thickness of the reaction-side brake lining is not the same as the friction lining thickness of the application-side brake lining (5).

Claims

1. A floating-caliper disc brake of a utility vehicle, comprising: a brake disc; a brake carrier spanning the brake disc having pad shafts arranged on both sides of the brake disc; a brake caliper engaging over the brake disc that is displaceable relative to the brake carrier; brake pads arranged on both sides of the brake disc in a respective pad shaft of the brake carrier, each brake pad having a pad carrier plate and a friction lining attached to the same, wherein an application-side brake pad is pressable against the brake disc via an application device and a reaction-side brake pad is pressable via a brake caliper back by shifting the brake caliper against the brake disc, the brake caliper is adjustable by a wear adjustment travel axially to an axis of rotation of the brake disc via an adjustment device, with an identical volume of the friction linings in a new condition, a friction lining thickness of the reaction-side brake pad is unequal to a friction lining thickness of the application-side brake pad, the friction lining thickness of the reaction-side brake pad is less than the friction lining thickness of the application-side brake pad, and a friction ring thickness of the brake disc on a side of the brake pad with the smaller friction lining thickness is less than a friction ring thickness of the brake disc on the side of the brake pad with the greater friction lining thickness.

2. The floating-caliper disc brake as claimed in claim 1, wherein a wear adjustment travel of the brake caliper is matched to the smaller friction lining thickness of the brake pad with the smaller friction lining thickness.

3. The floating-caliper disc brake as claimed in claim 1, wherein the brake disc is positioned in a brake disc opening of the brake carrier such that a distance of a friction ring surface of the brake disc facing the reaction-side pad shaft to the reaction-side pad shaft of the brake carrier is less than the distance of a friction ring surface of the brake disc facing the application-side pad shaft to the application-side pad shaft of the brake carrier.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a lateral sectional view through a part of a floating-caliper disc brake.

DETAILED DESCRIPTION OF THE DRAWINGS

(2) In the following FIGURE description, terms such as top, bottom, left, right, front, back etc. are exclusively applicable to the exemplary representation and position of the disc brake, of the brake disc, of the brake carrier, of the brake caliper, of the brake pads and the like selected in the respective figures. These terms must not be understood to be restrictive, i.e. these references can change through different working positions or the mirror-symmetrical interpretation or the like.

(3) In FIG. 1, a part of a floating-caliper disc brake of a utility (commercial) vehicle as a whole is marked with the reference number 1. The floating-caliper disc brake comprises a brake disc 4 and a fixed brake carrier 3 which spans the brake disc 4 frame-like, and a brake caliper 2 that is displaceable in a direction z, which corresponds to the brake disc axis of rotation, relative to the brake carrier 3.

(4) Here, the brake carrier 3 comprises, viewed in the direction z, carrier horns on both sides of the brake disc 4 which extend in the y-direction and serve for supporting the brake pads 5, 6 in the circumferential direction of the brake disc 4. The carrier horns on each side of the brake disc 4 together with a respective web connecting the carrier horns with one another form a pad shaft in which the brake pads 5, 6 are received.

(5) The brake caliper 2 engages over the brake disc 4, wherein on a side of the brake disc 4 facing away from the wheel an application device 7 is received in the brake caliper 2. On a side of the brake disc 4 facing the wheel, the brake caliper 2 has a brake caliper back 21.

(6) The application device 7 substantially comprises a brake lever 71, which is actuatable with the help of a brake cylinder (not shown) of the floating-caliper disc brake 1 and which for applying the disc brake is pressed against a bridge 72. The bridge 72 in turn presses onto threaded tubes (which are not shown here) with thrust pieces 74 arranged at their ends, which press the application-side brake pad 5 against the brake disc 4.

(7) Following the overcoming of an air gap clearance between the brake pad 5 and the brake disc 4, the force exerted in the process is transmitted via the brake caliper 2 onto the reaction-side brake pad 6, wherein the brake caliper 2 in the process moves in the direction z towards the application side of the brake caliper 2.

(8) Following completed braking, a compression spring 73 of the application device 7 presses the bridge 72 together with the threaded tube and the thrust piece 74 back into the starting position.

(9) Furthermore, in the region of the application device 7, an adjustment device is provided in the brake caliper 2, with which the position of the brake caliper 2 is axially adjustable by a wear adjustment travel relative to the axis of rotation of the brake disc 4, i.e. in the direction z.

(10) Each of the brake pads 5, 6 consists of a pad carrier plate 51, 61 and a friction lining 52, 62 attached to the same. As shown in FIG. 1, the thickness d.sub.R of the reaction-side brake pad 6 is unequal to the friction lining thickness d.sub.Z of the application-side brake pad 5. The volume of the friction linings 52, 62 of the application-side brake pad 5 and of the reaction-side brake pad 6 in this case is equal in particular in a new condition of the brake pads 5, 6.

(11) In particular, the friction lining thickness d.sub.R of the reaction-side brake pad 6 is less than the friction lining thickness d.sub.Z of the application-side brake pad 5.

(12) The side of the disc brake 1 viewed from the brake disc 4 in the z-direction, on which the application device 7 in the brake caliper 2 is arranged, is referred to as the application side. The other side of the brake disc 1 facing a vehicle wheel of the utility (commercial) vehicle, on which the brake caliper back 21 is located, is referred to as the reaction side.

(13) As is further evident in FIG. 1, the friction ring thickness of the brake disc 4 on the side of the reaction-side brake pad 6, i.e. the side of the brake pad with the smaller friction lining thickness d.sub.R, is less than the friction ring thickness of the brake disc 4 on the side of the application-side friction lining 5 with the greater friction lining thickness d.sub.Z.

(14) The wear adjustment travel of the brake caliper 2 is suitably matched to the smaller friction lining thickness d.sub.R of the reaction-side brake pad 6.

(15) Particularly preferably, the brake disc 4 is positioned in the brake disc opening of the brake carrier 2 in such a manner that a friction ring surface 42 of the brake disc 4 facing the reaction-side pad shaft is nearer to the reaction-side pad shaft of the brake carrier 3 than a friction ring surface 41 of the brake disc 4 facing the application-side pad shaft.

(16) The reduction of the friction lining thickness d.sub.R of the reaction-side brake pad 6 is particularly advantageous since, for the force introduction into the brake pad 6 during the application of the disc brake 1, a very large pressure surface is available by way of the lining contact surface in the brake caliper back 21, which makes possible uniform pressing against the friction lining 62 of the reaction-side brake pad 6 that is enlarged in the area perpendicularly to the direction z relative to the friction lining 52 of the application-side brake pad 5.

(17) Altogether, the reduction of the friction lining thickness d.sub.R of the reaction-side brake pad 6 and, if appropriate of the friction ring thickness of the brake disc 4, results in a reduction of the displacement travel of the brake caliper and thus an enlargement of the installation space of the disc brake that can be utilized for other purposes.

LIST OF REFERENCE CHARACTERS

(18) 1 Floating-caliper disc brake 2 Brake caliper 21 Brake caliper back 3 Brake carrier 4 Brake disc 41 Friction ring surface 42 Friction ring surface 5 Brake pad 51 Pad carrier plate 52 Friction lining 6 Brake pad 61 Pad carrier plate 62 Friction lining 7 Application device 71 Brake lever 72 Bridge 73 Compression spring 74 Thrust piece dR Thickness reaction-side friction lining dZ Thickness application-side friction lining

(19) The foregoing disclosure has been set forth merely to illustrate the invention and is not intended to be limiting. Since modifications of the disclosed embodiments incorporating the spirit and substance of the invention may occur to persons skilled in the art, the invention should be construed to include everything within the scope of the appended claims and equivalents thereof.