SI23474A - Brake disk with cooling elements - Google Patents

Abstract

Disk (1) for disk brakes is made of two coaxial and parallel ring plates (2) which are distantly fixed and connected with barrel elements (3). On the inner circumference of the ring plates (2) there are connection elements (4) for fixing the brake disk and the shaft hub. On the inner sides of ring plates (2) there are plenty of cooling elements in a protruding form (3) which are situated linear around barrel elements (3) in a raster form. The protruding form of these elements maximizes the area of the ring plates (2) what maximizes the heat transfer into the surrounding during braking process. The cooling is also accelerated because of increasing of air turbulences between the ring plates (2). The lower brake disk (1) temperature increases the braking efficiency and decreases the number of the scratches which damage the brake disk (1).

Description

The subject of the invention relates to brake discs, ie. disc brakes, in particular disc brakes for gray cast iron vehicles.

A technical problem

The technical problem is how to ensure efficient and even cooling of the brake disc with air flow.

The state of the art

Disc brakes are devices designed to slow or stop vehicles. The disc brake comprises a brake disc with a hub to connect to the shaft to be braked, and brake calipers with brake pads that engage with the side surfaces of the brake disc when braking. Due to the friction between the brake disc and the brake pads, the kinetic energy of the vehicle changes to heat, which in turn heats the brake disk. The heat released is particularly high when braking vehicles that are moving at high speeds or have high masses, such as eg. timic vehicles.

As the temperature of the brake increases, its efficiency decreases as the coefficient of friction of the surface of the disk and its friction force decrease. In addition, high temperatures in conjunction with the mechanical loads of the brake disk and thermal stresses due to local temperature differences in the brake disk cause mechanical damage to the brake disk surface, which are reflected in the cracks and plastic deformation of the brake disk.

In general, the problem of overheating of the brake disk is solved by the through holes, which are formed in the brake disk in the axial direction, through which the flow of cooling air flows and cools the brake disk. Such holes, on the other hand, are the source of cracks and, as a last resort, cause the brake disk to burst.

Another, more effective way of solving the problem of overheating the brake is to provide such a brake disc structure comprising two coaxial, mutually parallel annular plates spaced apart and interconnected by webs in the form of ribs or cross-sections so as to form channels through which the brake flows air flow and heat dissipation from the brake discs and rotors. The intensity of cooling of the brake disc increases with the increase of the number of racks or the increase in the diameter of the racks, as this increases the surface through which heat is released. However, such an increase is only possible to some extent, since at the same time the cross-section of the channels between the walls through which the air flow flows is reduced, and thus the intensity of heat transfer from the stands and the annular plates to the air.

Document GB 1 449 512 discloses a disc brake disc comprising two coaxial rotary discs interconnected by transverse elements that determine the crossings for the cooling air flow. Disk cooling is more intense in the areas where the respective collateral plate contacts the respective transverse element, and less intensely in the regions of the respective collapse plate in the middle between the respective adjacent transverse elements.

The solution to a technical problem

The solution to the technical problem is according to the present invention in a disc brake disc comprising two coaxial, mutually parallel, disc plates. On the inner circumference of the annular plates are your elements for connecting the brake disc to the hub of the shaft to be braked. The colobiae plates are spaced apart from each other and interconnected by cylindrical webs parallel to the rotary axis of the disc and substantially evenly spaced over the surface of the colobiae discs. On the inside of at least one colobia plate, preferably both, is a plurality of projections in the form of projections. The projections are linear and arranged between the webs to form a raster. Said raster is formed in such a way that each projection connects each adjacent web. The projections on the outer / inner circumference of the annular plate are arranged to connect the outer / inner webs with the outer / inner edges of the annular plate. The cooling elements are a circular plate. The cross-section of the projections is selected from a set of shapes formed by a quadrilateral, a triangle, a semicircle, an ellipse section, and a trapezoid. The edges of the said cross-sections and the contacts of the projections with the colobia plate are rounded.

The projections in the form of protrusions increase the surface of the inner surface of the brake disk and thus intensify the heat dissipation from the disk. At the same time, the projections contribute to a more turbulent flow of air through the brake disk, which again has a beneficial effect on the heat dissipation from the brake disk to the surrounding air. A further advantage of the brake disc according to the invention is that the cooling elements cause a more uniform cooling of the brake disk and thus lower internal stresses in the brake disk material due to smaller local temperature differences and thus less damage to the brake disc surface in the form of cracks. The following are examples of embodiments.

Figure 1: Brake disc with protruding coolers

Figure 2: Cross section of a brake disc section with projections in the form of projections

The subject of the invention is a disc brake disc 1 for a disc brake comprising two coaxial, mutually parallel rotary plates 2. On the inner circumference of the annular plates 2 are your elements 4 for connecting the brake disc to the hub of the shaft to be braked. The annular plates 2 are spaced apart from one another and interconnected by cylindrical webs 3, which are parallel to the rotating axis of the disk, and are substantially evenly spaced over the surface of the annular plates 2. On the inner side of at least one • annular plate 2, preferably both , a plurality of projections are formed in the form of projections 5. The projections 5 are linearly arranged and arranged around the racks 3 so as to form a raster. Said raster is formed such that the projection 5 connects the respective adjacent webs 3. The projections 5 on the outer / inner circumference of the annular plate 2 are arranged to connect the outer / inner columns 3 with the outer / inner edge of the annular plate 2. The cooling elements in the form projections 5 are a scaffold with a circular plate 2. The cross section of projections 5 is selected from a set of shapes formed by a quadrilateral, triangle, semicircle, ellipse section, trapezium, the edges of these shapes being in cross-section and the contacts of projections 5 with circular plate 2 formed rounded.

When the disc brake is applied, the brake calipers are injected with the brake disc 1. The kinetic energy of the vehicle to be braked is converted into thermal energy, which greatly warms the brake disc 1. The free space between the annular plates 2 and the cylindrical webs 3 allows the cooling air to flow, which brake disc 1 cools. The cooling projections 5 according to the invention increase the inner surface of the brake disk and thereby improve the heat dissipation from the brake disk 1. On the other hand, the cooling projections 5 cause the air in its path through the brake disk 1 to swirl, thereby again increasing the intensity of heat dissipation from the brake disk 1. disk.

Claims (6)

Patent claims A disc brake (1) for a disc brake, in particular for a disc brake for thymic vehicles, comprising two coaxial, parallel and spaced wheels (2), elements (4) for connecting the brake disc to the hub of a shaft which the brakes (4) having elements (4) for connecting the brake disc to the hub of the formation shafts on the inner circumference of the annular plates (2), the cylindrical webs (3) interconnecting the annular discs (2) are parallel to the rotating axis of the disc and are substantially evenly spaced over the inner surface of the colobiae plates (2), characterized in that it further comprises a plurality of projections in the form of projections (5) which are screwed on the inside of at least one colobiae plate (2), preferably both. Disc brake disc (1) according to claim 1, characterized in that the projections (5) are linearly shaped and arranged on the inner surface of the annular plates (2) to form a raster. Disc brake disc (1) according to claim 2, characterized in that said projection raster (5) is formed such that the projection (5) connects the respective adjacent webs (3), while the projections (5) are the outer / inner circumference of the annular plate (2) arranged to connect the outer / inner racks (3) with the outer / inner edge of the annular plate (2). Disc disc brake (1) according to any one of the preceding claims, characterized in that the projections in the form of protrusions (5) twist a disc with a disc (2). Disc brake disc (1) according to any one of the preceding claims, characterized in that the cross section of the projections (5) is selected from a plurality of shapes formed by a quadrilateral, triangle, semicircle, ellipse section, trapezoid. • · Disc disc brake (1) according to claim 5, characterized in that the edges of said shapes are cross-sectioned and the contacts of the projections (5) with the annular plate (2) are rounded.