SU1305465A1 - Cooled drum-shoe brake - Google Patents

Abstract

The invention relates to the field of engineering, mainly to vehicles. The aim of the invention is to increase the durability by ensuring the cooling efficiency due to the intensive cooling of the rubbing surfaces. For this, the brake has a disk 14 with radial centrifugal blades 15, the flange 9 of the drum has a cylindrical protrusion 10. In the protrusion C1 oo o cd C5 ate

Description

10, tangential tapering grooves 11 are provided, passing into the axial holes 12, the guide disk 14 is attached to the inner surface of the drum flange 9. When driving a vehicle

one

The invention relates to mechanical engineering, primarily to vehicles.

The purpose of the invention is to increase the durability by providing an effect. cooling performance due to intensive cooling of pipes

FIG. Figure 1 shows the drum-drum brake, longitudinal section; in fig. 2 shows section A-A in FIG. one; in fig. 3 shows a section BB in FIG. 2

The drum-type brake contains drum 1, brake pads 2 with friction linings 3, with which the expanding fist 4 is located and the return spring connecting them connects 5. In the right part, the brake pads 2 are mounted on the eccentric pins 6 attached by nuts 7 to the brake shield 8. The brake drum 1 has a flange 9 with a protrusion 10 in which there are tangential tapering grooves 11 passing into the axial holes 12. At the same time, the tangential grooves 11 are covered by the filter 13 to prevent the friction brake friction pairs from falling onto their dirt and dust. A guide disk 14 with centrifugal blades 15 is attached to the inner surface of the flange 9 of the drum 1. The latter in their end part 16 form a gap with an inoperative surface 17 of the bases 18 of the brake shoes 2 and are located

but to the center of the brake mechanism.

Cooled drum-type brake works as follows.

When the vehicle is moving, the oncoming airflow is captured by the tangential grooves 11 of the rotating drum 1 and through the axial holes 12 is supplied to the centrifugal blades 15 of the guide disk 14. In the tangential slots 11, the air swirls and its speed

the air flow is captured by the tangential slots 1-1 and fed through the axial holes 12 to the centrifugal blades 15, and from there to the zone of elevated temperatures between rubbing brake surfaces. hp ff, 3sh1.

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increases, and with the passage of the axial holes 12 remains constant. When exiting the axial holes 12, the air expands sharply and the speed of its movement decreases. When air enters the centrifugal blades 15, its speed increases and it washes over the working surfaces of the drum 1 and the friction linings 3, which contributes to their intensive natural cooling due to frequent air changes in the gap between the friction brake pairs. The amount of air that washes the brake's brake surfaces depends on the frequency of rotation of drum 1, section of tangential slots 11 and axial holes 12, as well as the number of centrifugal blades 15, which can be interchangeable and have a different shape.

In the process of braking the vehicle, force is applied to the expanding cam 4 and the brake pads 2 with the friction linings 3 interact with the working surface of the drum 1, which leads to the generation of heat on their rubbing surfaces. In this case, the cooling air flows will wash the working surface of the rim of the drum 1 in the place where the pads 3 do not interact with the drum 1. After the braking is completed, the expanding force is removed from the cam 4, and the return spring 5 allows the pads 2 to take the original position. After that, the air flows into the gap between the end of the brake drum 1 and the brake shield 8.

Claims (1)

1. ohla) vdamey drum-type brake mainly for vehicles, containing brake31 Noah drum with flange, brake shield, brake pads with base and friction linings, expanding fist and tension spring, and also mounted in the cavity of the drum p. radial centrifugal blades and through axial bores in the drum, communicating with its cavity, characterized by that, in order to increase longevity by ensuring cooling efficiency, it is equipped with a guide disk, the radial centrifugal blades are fixed to the direction The disk is fixed on the inner surface of the drum flange with a gap relative to the non-working surface of the brake pad bases, a cylindrical protrusion with tangential slots tangential to the axis is made on the outer side of the flange, and the axial holes are made in the tangential grooves. 2, a brake according to claim 1, characterized in that it is provided with a filter mounted on tangential tapering grooves. 15 Editor A. Petrov Compiled by I. Lukin Tehred V. Kadar Proofreader A. Obruchar Order 1415/36 Circulation 812 VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 Rag.z Subscription