The brake mechanism
(57) Abstract:Usage: used in the field of transport, mainly in brake mechanisms of the vehicle. The inventive brake mechanism includes a rotating brake drum 1, the non-rotating brake pads 2, Rethimno fist 8, additional brake pad 4 and the drive cylinder 5. Brake cylinder 5 additional presses the pad 4 to the drum 1, while Rethimno fist 8 is translated into position and presses the brake pads 2 to the drum 1, stermaria it. 1 Il. The invention relates to the field of transport, mainly to the brake mechanisms (TM) vehicles.The most common are the friction, the principle of which is based on the friction of the rotating parts of the non-rotating. In the form of rotating parts TM are divided into drum and disc. Non-rotating parts drum TM can be pads or tape, disc pads only. Tape drum TM consists of rotating and non-rotating drum of the tape (see the Car. Based design. M. engineering, 1986, S. 226). Disk TM consists of a rotating disk and newradius. ibid S. 227), TM have Rethimno a device that provides a contact of the working parts when braking. Expanding devices are wedge and in the form of a camshaft fist working when turning. Work expanding device using the drive mechanism, which may be in the form of a lever, hydraulic and pneumatic cylinder or air chamber. Also known drive mechanism in the form of a brake cylinder, a weight-bearing function of the camshaft.The disadvantage of the listed TM is a direct dependence of the efficiency on the magnitude of the effort on the drive and the inability to use the kinetic energy of the rotating parts to brake.The closest to the proposed device is a drum drum TM from the expansion device in the form of a fist (see the book of the Braking device. Guide, p/p Alexeev M. P. M. engineering, 1985, S. 81-82, Fig. 2.32), containing a rotating brake drum, a non-rotating brake pads, Rethimno device in the form of a fist, working in turn, connected through a lever mechanism of the camshaft drive device in the form of an air chamber, which is provided by compressed air from the brake system. Nedostatki energy. At the same time rotating parts TM have kinetic energy, which is desirable to use camshaft device.This is achieved by the fact that in TM with equal displacements pads containing a rotating brake drum, a non-rotating brake pads, Rethimno device in the form of a fist, working when turning, the drive mechanism in the form of a cylinder provided with an additional brake pad, which may be against the rotating brake drum. Brake cylinder mounted on Rethimnon Cam, translates it into its working position, in which brake pads are pressed against the brake drum. The braking torque depends on the degree of entrainment of additional drum pads, and the degree of entrainment depends on the strength of cuddling additional pads to the drum. Thus the work of the camshaft device is provided by the kinetic energy of a rotating brake drum, then there is a process requireany energy.The supply of the drive mechanism of the additional brake pad that is pressed against the rotating parts, translates Rethimno device in working position, allows independent is to be the work of the camshaft device due to the kinetic energy of the rotating parts.This invention is illustrated in the drawing, which shows the recovery of TM in the cut. The mechanism consists of the drum 1, block 2, mounted on the axles 3, additional pad 4 attached to the piston of the brake cylinder 6, the return spring of the piston 7, a brake cylinder mounted on Rethimnon Cam 8, is made to rotate on the supporting sleeve 9. The supporting sleeve 9 is fixed on the supporting disk 10. The fist is equipped with a return spring 11 and is mounted on the trunnion 12. Pads 13 provided with a compression spring.Works TM as follows. The piston 5, the brake cylinder 6 additional presses the pad 4 to the rotating drum 1. Captured by the additional drum pad rotates Rethimno fist 8, which presses the pads 3 to the drum 1. Is braking. The brake mechanism containing a rotating brake drum, a non-rotating brake pads, Rethimno fist for brake pads, brake cylinder to drive the camshaft fist into the operating position, characterized in that Rethimno fist equipped with an additional Shoe made with the possibility of its drive through the brake cylinder to bring in additional interaction is
FIELD: automobile production.
SUBSTANCE: invention refers to automobile production industry, namely to brake parts assembly. Braking mechanism of drive wheel with independent suspension comprises drive wheel actuator, moving and fixed part of braking mechanism. Moving and fixed part of braking mechanism are installed at vehicle spring-suspended weight.
EFFECT: there achieved is improvement of vehicle controllability at high speed due to decrease of steering wheel resistance to turning, increase of vehicle brake system security due to removal from brake cylinder actuator of rubber hose support necessary for motion compensation caused by suspension vibration and increase of vehicle traveling comfort via decrease of vehicle unsprung weight.
SUBSTANCE: invention relates to automotive industry, particularly, to braking systems. Drive assembly comprises central housing, drive input and output elements, braking system, lateral housing and separator of housings. Central housing has lengthwise element and two lateral ends. Drive input and output elements are connected with central housing. Braking system is connected with central housing. Lateral housing is connected with one of lateral ends of central housing to accommodate drive assembly output. Separator of housings is arranged between central housing and lateral housing to make the former longer. Method of facilitating drive universal possibilities consists in increasing braking capacity of the brake by assembling brake system with additional brake disc and making central housing longer so that is accommodates extra brake disc.
EFFECT: possibility to incorporate brake system and drive assembly with different vehicles without notable modification of components.
10 cl, 3 dwg
SUBSTANCE: invention relates to automotive industry. Vehicle comprises set of wheels mounted at the frame. Every wheel is engaged with engine to drive the vehicle. Self-locking differential gear is supported by the frame. First and second half-axles are engaged with said self-locking differential gear. First half-axle supports first wheel of aforesaid set. Second half-axle supports second wheel of aforesaid set. Brake is engaged with self-locking differential gear. Said brake selectively applies braking force to said first and second wheels via one part of self-locking differential gear to reduce vehicle speed. When said brake is engaged, control unit selectively increases engagement of self-locking differential gear in response to difference in rpm of said first and second wheels exceeding the first preset rpm. Invention covers also the method of vehicle control.
EFFECT: better braking, minimised and well-centered vehicle weight.
15 cl, 18 dwg
SUBSTANCE: invention relates to aircraft engineering, particularly, to brakes of starting launchers. Proposed device comprises housing accommodating friction plate clutch sliding therein and clamping mechanism. Clamping mechanism consists of a spring fitted between two pressure rings that displace in splined guides. Friction plate clutch shaft is equipped with the element for engagement with transmission drive and shank that has movable thread joint with the carriage. Bracket ratchet mechanism consists of ratchet and latch.
EFFECT: higher reliability and improved performances.
SUBSTANCE: method consists in determination of mechanical component of friction power at initial parameters of friction pad form which component pad's volume wear rate is found. Actual lifetime of friction pad is determined from found value of wear rate. Then, lifetime increment value is assigned and optimal values of area, length of friction pad and brake disc roughness radius are determined.
EFFECT: increasing friction pad lifetime due to consideration of friction pad and brake disc geometrical parameters impact on the value of friction power mechanical component and to selection of efficient ratio of their geometrical parameters.
FIELD: machine building.
SUBSTANCE: method of emergency braking machines consists in that braking is performed by creation in brake system of “braking impact” effect between friction brakes and brake drum to adjust amount of braking distance. Thus, by adjustment of dynamic loads in machine due to move suspension braking element and by changing conditions attachment point of suspension braking element.
EFFECT: better braking properties of system and maximal automation of braking in extreme conditions.
1 cl, 1 dwg
FIELD: machine building.
SUBSTANCE: invention relates to bearing bracket for drum brakes. Configuration of bearing bracket for drum brake of vehicle to be installed with possibility of rotation of eccentric shaft drum brake passing parallel to rear axle at distance from it and to secure brake cylinder drum brake. Configuration comprises support bracket for rotation of eccentric shaft. Bracket is attached to rear axle nearby drum brake. There is also separate attachment for fixing brake cylinder to bearing bracket. In method of configuration settings of bearing bracket and brake cylinder on drum brake is assembled set containing bracket, eccentric shaft connected with brake lever, on one end and cam configuration on other end. Eccentric configuration comprises circular configuration around rear axle nearby drum brake.
EFFECT: simplified installation configuration.
7 cl, 7 dwg
SUBSTANCE: transmission contains braking, clutching and gear-shifting bodies in the gearbox and the brake clutch. The system of interconnecting the two shafts is based on a modified planetary gear, which uses a gear with external teeth, located on a rotation axis - a brake gear. The brake gear is run by satellite gears. For the coupling between the two shafts, a brake gear and a satellite gear are sufficient. For braking, two or more parallel-arranged modified planetary gears are required. Wherein the satellite gears are fixed to a common shaft, which is rotatable with respect to the carrier. The brake gears have independent rotation capability and protruding cylindrical parts outside the housing.
EFFECT: design simplification and compactness.
2 cl, 4 dwg
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.
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
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.
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
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.
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.
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.
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.
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.
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