Shaped as exclusively radially-movable brake-shoes (F16D51/10)

Repair set of brake pads for vehicle brake shoes // 2557339
FIELD: transport.SUBSTANCE: invention relates to machine building and can be used for repair of automotive brake shoes, particularly, those for trucks. This repair set comprises brake friction shoes with bores bored and turned in pairs for rivets and steel hollow tubular rivets for securing brake pads to brake shoes. Said brake pads represent cylindrical different-depth rings of drop-like (crescent-like) shape. Note here that depth of pad one end makes 8.0-17.0 mm, that of the opposite end makes 12.0-20.0 mm and that of pad centre makes 15.0-24.0 mm. Said brake pad had coloured bead to control over pad wear.EFFECT: fast replacement of worn-out brake pads, higher vehicle safety.2 cl, 4 dwg

System of thermoelectric polarisation of drum-shoe brake friction pad surfaces in test conditions // 2533864
FIELD: transport.SUBSTANCE: invention relates to machine building and may be used in heavy-duty drum-shoe brakes. The system contains brake drum, brake shoes with base, friction pads and ribs, includes thermal elements embedded into brake shoes with pads which thermal elements is made as thermobatteries. Working surfaces of rim and pads are divided by longitudinal grooves of various width which are aligned in vertical plane thus forming independent friction pairs - "metal disks - friction pad sectors". The thermobatteries connected to external electric current source work in the mode of thermal electric generator providing heating near-surface layers of friction pad sectors. When polarity of external circuit current is changed the thermobatteries work in the mode of thermal electric cooler thus providing cooling of near-surface layers of friction pad sectors. In mixed processes of "heating -cooling" thermobattery cells function as cold junctions.EFFECT: possibility of thermoelectric polarisation evaluation for drum-shoe brake friction pad surfaces in test conditions due to implementation of mixed processes - "heating - cooling" including polarisation of friction pad section surfaces during their cooling and by action of polarising external electric field due to semipermanent rate of heating by means of thermobatteries working in modes of thermal electric generator and thermal electric cooler.9 dwg

ethod of heating and cooling of brake drums of carrier drum-shoe brake for evaluation of their thermal balance // 2525347
FIELD: transport.SUBSTANCE: invention relates to ship building. Proposed method consists in that surfaces of the first brake drum are completely isolated from ambient medium. Surfaces of the second brake drum interact with the latter at internal heaters separately connected for equal time interval and surrounding drum working surfaces to external electric current source. Then, heaters are disconnected from said source, temperatures (t1) and (t2-t1) of the first and second drum surfaces are measured to define portion of heat dissipated in ambient medium by convective and radiant heat exchange. Proposed method consists in cyclic braking of the carrier. Here, the brake friction pairs are heated to define from ratio of measured surface temperatures (t1-t0/(t2-t0) at different intensity of radiant and forced convective heat exchange from said surfaces the portion of heat derived to rear axle hub flange.EFFECT: possibility of definition of heat losses for proper selection of friction lining materials.4 cl, 5 dwg

Device and method for determination of thermal conditions of drum-shoe brake metal-polymer friction pairs at loading under test bench conditions // 2514385
FIELD: transport.SUBSTANCE: invention relates to automotive industry, particularly, to brake systems. Proposed device comprises brake drum and brake shoes with friction linings secured thereto. Working surfaces of the rim and friction linings have surfaces plies heated at single, cyclic of long-term braking due to current generation at the surface of friction pairs. At braking, thermal resistance of the contact between metal-polymer pairs produces plain and semiconductor films at friction that feature heat- and electrically-conducting properties to make set of micro thermal batteries. Temperature difference us generated at junctions of said micro batteries. Passage of the main quantity of heat through the film generates sufficient output power for operation of said set of micro thermal batteries. Proposed method consists in heating the thermal electrodes of plate thermocouples by single cyclic or long-term braking due to current generation at the surface of friction pairs. Said plate thermocouples make said set of micro thermal batteries. Their thermal EMF is used to define the thermal conditions of friction pairs.EFFECT: thermal EMF is used to define the thermal conditions of friction pairs.2 cl, 19 dwg, 2 tbl

ethod to detect directions of electric current components in friction pairs "polymer-metal" of drum-block brake during their heating in bench conditions // 2462628
FIELD: machine building.SUBSTANCE: method to detect directions of electric current components in a tribotechnical system "polymer-metal" of a drum-block brake during its heating in bench conditions consists in setting a common law of microcurrent formation on macroareas of friction surfaces due to formation of "stiff" and "soft" oxide films on them. Then under the condition that electronic work function from a friction pad Wn is higher than electronic work function from a rim of a brake drum WM, with preferable direction of its rotation, the total current of electrisation I"ф" generated in circuits by triboelectromotive forces is detected with account of directions of its summands. The method to detect directions of electric current components in a tribotechnical system "polymer-metal" of a drum-block brake with account of preferable direction of brake drum rotation during its heating in bench conditions above the permissible temperature for materials of a friction pad consists in setting a common law of microcurrent formation on macroareas of friction surfaces due to formation of "stiff" and "soft" oxide films on them. Then the total current of electrisation I"ф" generated in circuits due to triboelectromotive forces is detected with account of directions of its summands.EFFECT: method achieves detection of directions of total current components generated with microthermoelectric generators and microthermoelectric refrigerators on macroareas of direct and reverse friction pairs "polymer - metal" of a drum-block brake during their heating in bench conditions.2 cl, 19 dwg

Shoe-drum brake // 2460913
FIELD: transport.SUBSTANCE: brake comprises brake drum with rim, brakes shoes, coupling springs, brake disc and drive, constant voltage source with poles connected to cooler and friction surfaces. Said rim features inner and outer surfaces with cooler. Layer of capillary-porous filler is fitted into recesses on brake shoe bases. Friction linings and metallic friction elements are attached to brake shoes. Cooler is made up of ribbed ring from capillary-porous material with inner cylindrical surface electrically insulated from drum rim outer surface, wherein shifted through different-diameter holes are made with capillary-porous cylindrical elements fitted therein. Brake shoe base recesses accommodate capillary-porous material layer with electrically-isolated back layer connected, together with cooler, to constant voltage source negative pole. Brake drum rim friction and metallic friction elements surfaces are connected to source positive poles.EFFECT: higher efficiency of braking.6 dwg

ethod of defining directions of electric current components in friction pairs ''polymer-metal'' of drum shoe brake at its heating at test bench (versions) // 2459986
FIELD: machine building.SUBSTANCE: proposed method consists in heating independent friction pairs ''metal discs - friction facing sectors'' by cyclic or long-term braking at test bench to temperature below, equal to and above tolerable temperature for friction facing materials. Then, thermal electrodes of plate thermocouple are used to define thermal emf of thermal flux by relationship Ei=K(t1-t2), where K is thermal emf factor, mcV/°C; t1 and t2 are surface temperature of friction pairs and ambient medium, °C Then relationship is used where δ1,δ2,δ3,δ4 ; λ1,λ2,λ3,λ4 are thickness and heat conductivity factor of materials of the following elements: brake shoe base, friction facing and its surface layer, brake drum ring, to define total thermal current.EFFECT: accurate estimation of heat amount generated in braking.5 cl, 6 dwg

Friction lining // 2397381
FIELD: transport.SUBSTANCE: proposed friction facing is made from polymer friction material and features shape of different-thickness cylindrical shell ring part, the latter being formed by misaligned cylindrical surfaces with parallel axes of rotation and flat lateral surfaces. Lateral layer of thin edge is made with chamfer. Said facing has holes to receive rivets. Said holes arranged on thin edge of facing are partly located on beveling.EFFECT: improved operating properties.2 dwg

Friction facing // 2391580
FIELD: machine building.SUBSTANCE: facing made as part of cylinder shell created with non-axial cylinder surfaces with parallel axes of rotation and ends of different thickness. Side surface of the facing limiting the facing from the side of a thin end, is made as two conjugating flat surfaces. Side surface of the facing, limiting the facing from the side of a thick end, is made as flat surface, not radial to radius of external surface of the facing.EFFECT: reduced time for facing run-in during operation and simplification of manufacture of both facing and brake shoe with such friction facing.1 dwg

Friction facing // 2391579
FIELD: machine building.SUBSTANCE: length of facing arc along internal surface and difference of thickness of facing on ends corresponds to ratio: where H2 is thickness of thick end of facing, H1 is thickness of thin end of facing, and L is length of facing arc along internal surface.EFFECT: improved frictional characteristics of friction pair due to optimal correspondence of facing geometry to distribution of forces and pressure in drum brake.1 dwg

Friction lining // 2388945
FIELD: transport.SUBSTANCE: friction lining represents a part of cylindrical ring formed by misaligned cylindrical surfaces with parallel rotational axes and has different-thickness ends. Side surface limiting the lining on thin-end side represents two aligned flat surfaces. Side surface limiting the lining on thick-end side represents flat surface not radial to lining outer surface radius. Rotational axes of cylindrical surfaces are located in the plane that does not cross nor contact the lining.EFFECT: shorter running-in during operation.1 dwg

Drum-shot-type brake with "heat pipe"-type cooling // 2379560
FIELD: transport.SUBSTANCE: proposed brake comprises brake drum with cooling device, brake shoes with friction linings, show springs, brake disk and drive. Said cooling device represents cylindrical heat pipes arranged in identical-diametre through holes regularly spaced along perimetre at the brake drum center, perpendicular to friction surface. Plugs are arranged in heat pipes, on the side of brake drum rim. There are wedge-like rectangular-section through holes at heat pipes center to receive wedge-like plates to make extra heat exchange surfaces that contact brake drum non-working surfaces by their inner faces. Wedge-like plate outer surface features grooves accommodating spring ring.EFFECT: reduced thermal load, increased service life.2 dwg

Friction item // 2369784
FIELD: instrument making.SUBSTANCE: invention is related to the field of friction items, in particular to brake pads of drum brakes in vehicles. Friction item is equipped with openings for rivets installed in rows on both sides from plane of item symmetry at the same distance from plane of item symmetry. Ratio between distance from opening centres to plane of item symmetry and difference of maximum and minimum thickness of item in zone of its working surface makes from 6 to 26.EFFECT: invention provides for better operational characteristics of pad with varioys thickness due to optimisation of stresses that occur in pad in process of operation.2 cl, 2 dwg

Friction component // 2364769
FIELD: automotive industry.SUBSTANCE: invention relates to automotive industry, particularly to drum brake linings. Proposed friction lining is produced from polymer friction material and features the shape of a part of cylindrical ring. Ratio of radii of the lining inner and outer surfaces varies from 1.030 to 1.060 with polymer matrix content in the said friction composite exceeding 22% by weight. Aforesaid ratio of radii of the lining inner and outer surfaces varying from 1.060 to 1.095, polymer matrix content in the said friction composite is smaller than or equal to 22% by weight.EFFECT: higher operating performances.1 dwg

Block brake and its cam // 2364765
FIELD: transport.SUBSTANCE: invention relates to cam-driven block brakes and their components. Cam (38) has one or several ledges (62, 64) with multiple sections (62A-C, 64A-C) that feature various profiles in axial cross section. Varying the cam profile allows producing the cam with the extreme outer ends or apexes of the ledges with length exceeding that of common cams, the mechanical strength being preserved. Increased travel of brake shoes allows using brake shoe lining of increased thickness.EFFECT: longer life of brake shoe linings.45 cl, 11 dwg

echanism for automatic control of parking brake // 2300029
FIELD: automotive industry.SUBSTANCE: mechanism comprises expansion lever mounted on the axle for permitting rotation. The rocking axle is secured to the back brake block. The rocking axle of the expansion lever is provided with distance wedge that abuts against the bearing secured to the front brake block. The bearing is welded to the front braking block. The spring connects the distance wedge with the front brake block and is made of two steel plates. The position and shape of the plates allows wedging and releasing of the distance wedge.EFFECT: simplified structure.4 dwg

The brake mechanism // 2091258
 
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