Cast iron bridge of disc brake

Abstract

The invention relates to a cast-iron bridge of a disc brake, comprising two through-holes (4) which are connected to one another by means of a bridge body (1) and which are used to receive in each case one actuating spindle, a parting gap (3b) being formed at a distance from an outer edge (2) of the bridge body (1) in dependence on the production, said parting gap defining a shaped slope, characterized in that the outer edge (2) of the bridge body (1) is provided with a plurality of through-holes (4) which are connected to one another by means of the two through-holes (4). The parting seam (3b) extends parallel to the course of the arranged outer edge (2) of the bridge body (1).

Description

Technical Field

[0001] The invention relates to a cast iron bridge for a disk brake of a commercial vehicle according to the preamble of claim 1 . Background Art

[0002] Such a bridge is a component of a clamping device provided in a brake caliper, which also has a pivotable brake lever. During braking, the bridge and the brake plunger supported therein are moved in the direction of the brake disk, wherein the brake plunger is pressed against a brake lining which is pressed against the brake disk on the vehicle side.

[0003] The bridge is manufactured by the casting method, using a split mold, each with a bed formed from a model half.

[0004] The straight parting course that can be seen through the parting seam defines the technically required profile bevel, which rises from the outer edge of the bridge, but leads to a significantly thinner wall thickness. This is the area that is most highly loaded in the function of the bridge.

[0005] However, within the given installation space conditions predetermined by the brake caliper, the wall thickness cannot be increased to the desired extent required for an optimized load capacity.

[0006] As a result, the service life of the bridge is at least limited and must be replaced when necessary, ie when the permanent load in the corresponding area is too great.

[0007] Regardless of the fact that the wall thickness of the bridge cannot be arbitrarily thick in the above-mentioned region solely due to spatial conditions, such a design would also lead to a significant increase in the weight of the bridge, which is generally contrary to the constant demand for reducing the weight of disk brakes.

[0008] Furthermore, increasing the wall thickness leads to increased production costs due to the higher material usage, which is likewise disadvantageous. Summary of the invention

[0009] The object of the present invention is to further develop a generic bridge in such a way that its load-bearing capacity is increased with little structural and production effort.

[0010] This object is achieved by a bridge having the features of claim 1 .

[0011] Accordingly, the parting seam extends parallel to the course of an associated outer edge of the bridge, wherein the outer edge extends from one through-hole to another through-hole, which are arranged parallel and spaced apart from one another and serve to receive a respective adjustment spindle.

[0012] Preferably, the outer edge is dimensioned and has a recess in the bridge body for receiving a compression spring which, in the finished design of the disc brake, is supported on a closure cover by means of which the receiving space of the brake caliper of the disc brake is closed.

[0013] By the design according to the invention, the parting seam is closer to the outer edge of the bridge body than the parting seam according to the prior art, which results in a significant thickening of the wall in the load region and a reduction of the wall in the further course with respect to the axial extension of the through-opening.

[0014] While this region was previously overdimensioned, in particular because the loads on the side of the parting seam facing away from the outer edge were lower, the wall thickness in this region is now optimized.

[0015] This results in a material saving which not only reduces the weight of the bridge but also reduces the production costs.

[0016] The parting bevel required for production from the parting seam to the outer edge is provided at the inclination required for demolding, wherein the length of the parting bevel, seen in the cross section of the bridge head, is shorter than the length according to the prior art, but as mentioned is sufficient for demolding after casting.

[0017] As mentioned, the parting seam is assigned to the outer edge of the bridge body, which defines the recess for the compression spring. However, it is also conceivable to provide a parting seam and thereby a parting bevel on opposite sides, ie on both broad sides of the bridge body.

[0018] The bridge according to the invention corresponds to the bridge according to the prior art in its basic external dimensions, i.e., the predetermined construction space dimensions are maintained without restriction. In addition, the new bridge can be manufactured cost-neutral relative to known bridges and can be installed in existing disc brakes as a replacement part when necessary.

[0019] Further advantageous embodiments of the invention are indicated in the dependent claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Next, embodiments of the present invention will be described with reference to the drawings.

[0021] Shows:

[0022] Figure 1 A perspective view of a bridge according to the prior art;

[0023] Figure 2 A bridge according to the invention, also shown in perspective;

[0024] Figure 3 By following Figure 2 The cross section of the bridge;

[0025] Figure 4 According to Figure 3 The section description of A is as follows Figure 3 An enlarged section of the bridge. DETAILED DESCRIPTION

[0026] exist Figure 1 and 2 1 shows a bridge of a disk brake made of cast iron, comprising two through-holes 4 which are connected to one another via a bridge body 1 and extend in parallel and spaced apart from one another and are used to receive an adjusting spindle in each case.

[0027] exist Figure 1 , a bridge according to the prior art is depicted in which a parting seam 3a defining a (convex) shaped inclination is formed at a distance from the outer edge of the bridge body 1 due to production, and extends linearly through the bridge body 1 from one through hole 4 to the other.

[0028] Figure 2 A bridge according to the invention is shown, in which the parting seam 3 b ) runs parallel to the course of the associated outer edge 2 of the bridge body 1 .

[0029] It can be seen that, like the parting seam 3 b ), the outer edge 2 has a contour which deviates from a linear course.

[0030] Figure 3 The cross section through the bridge body 1 is shown, including the recess 6 formed on one side for contact with the brake lever and the opposing recess 5 for receiving a compression spring which is supported on the closing cover of the brake caliper in the installed position of the bridge.

[0031] The parting bevel is arranged in an upper wall region of the bridge body 1 which delimits the recess 5 , wherein the parting bevel can be arranged on an opposite wall region.

[0032] Figure 4 Shown corresponding to Figure 3 An enlarged section of the symbol A in FIG. 1 , which depicts a part of the wall of the pontic 1 .

[0033] To illustrate the invention, a parting seam 3 b ) is shown, just like a parting seam 3 a ) according to the prior art.

[0034] It can be seen that the wall is thicker in the region of the parting seam 3 b ) than the wall according to the prior art in this region, wherein the parting seam 3 a ) extends significantly further away from the outer edge 2 which forms the end face of the wall. Reference numerals list

[0035] 1 Bridge

[0036] 2 Outer edges

[0037] 3a Parting seam

[0038] 3b parting seam

[0039] 4 Through holes

[0040] 5 Gap

[0041] 6 Concave cavity

Claims

1. A cast iron bridge for a disc brake, comprising two through-holes (4) connected to one another via a bridge body (1), the through-holes being used to receive an adjustment spindle in each case, wherein: A parting seam (3b) defining a profiled inclination is formed at a distance from an outer edge (2) of the bridge (1) due to production, wherein the parting seam (3b) extends parallel to the course of the associated outer edge (2) of the bridge (1).

2. The bridge according to claim 1, characterized in that The shaped inclined portions are arranged on two wide sides of the bridge body (1).

3. The bridge according to claim 1 or 2, characterized in that: The parting seam (3b) is arranged adjacent to an outer edge (2) which defines a recess (5) for a compression spring.

4. The bridge according to any one of the preceding claims, characterized in that The course of the outer edge (2) deviates from a linear orientation.

5. The bridge according to any one of the preceding claims, characterized in that The outer edge (2) is formed by the end faces of the walls which bound the recess (5).

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