Air operated disc brake

FIELD: transport.

SUBSTANCE: invention relates to disc brake. Proposed brake comprises brake beam calliper (1) surrounding the brake disc (2) and brake shoe-linings (3) to be pressed against disc (2) both sides, one can be actuated on clamp side by the cam of clamping device brake lever (5) turning about the pin. Besides, this brake comprises the self-reinforcing device that features self-reinforcement factor selected so that after braking this brake releases automatically. Compressed air brake cylinder push-rod can act on lever (5). Said lever (5) thrusts on at least one ball-like support element (10) in calliper (1) that makes the cam pivot pin. Said element (10) abuts on support ball (9) located in direction of push-rod action above support element (10) and positioned in brake plunger (6) connected with lining (3) located on clamp side. Pressure plungers (7) are arranged on both sides of plunger (6) and spaced apart. One end of said pressure plunger rests on clamp (1) while opposite end thrusts via support ball (16) on lining (3). Pressure plunger (7) is secured in guide plate (4) arranged to displace to the axis of brake disc (2) in the brake mechanism shield (8).

EFFECT: optimised design, weight and sizes, higher efficiency.

9 cl, 4 dwg

 

The invention relates to a pneumatic disk brake according to the restrictive part of paragraph 1 of the claims.

Such pneumatic disc brake is known, for example, from EP 0553105 B1 and EP 1230491 B1.

Thus formed on the end of the Cam resting on the bracket disc brake brake lever because of transferrable high actuation forces made very massive steel forged parts or castings of ductile iron.

Because of the large ratio of the lever, for example i=L1: e=15,6:1 (L1 = length of lever arm, e = eccentricity), which is obtained from the ratio of the supplied brake force and effort, created the brake cylinder, from which it again follows correspondingly large angle of rotation of the brake lever, there are correspondingly high friction losses in the bearing of the eccentric. To reduce the applied half of the bearing shell, which cover eccentric bearing.

This lever is of such shape that when the power transmission from the driven roller bearings on the eccentric bearing no bending moments, which as a result could lead to distortions in the bracket disk brake mechanism.

However, the implementation of such linear guides is possible only with high costs made the e with correspondingly high cost of manufacture.

In addition, such bearings, of course, is relatively sensitive to damage that is not consistent with the optimized service life.

Therefore, in the document EP 1230491 B1 proposed to support the brake lever on the bracket disc brake use only the bearings, which along with a low cost of manufacture are particularly high reliability.

However, the coefficients of friction applied, maintenance-free sliding bearing are several times larger than the coefficient of rolling resistance of the rolling bearing, which naturally affects the provision of the braking force that should be generated in the brake cylinder.

Because of the relatively large diameter of the bearing follows the distance from the axis of rotation eccentric to the point of application of force to the brake pad, located on the side of the clamp that turns out to be an additional bending moment acting on the brake lever. In order to keep the resulting deformation of the brake lever at a low level, it is very solid, although not fully avoid these deformations and following from this increased requirement in the brake cylinder.

Generally known for the corresponding kind of the disk brake, in particular, does not address emmorey to the requirements of the required structural space, the available weight and efficiency.

The objective of the invention is the further development of disc brakes of the generic type, which is optimized in terms of its constructive space, its weight, its efficiency and its cost of manufacture.

This problem is solved by using disc brakes with signs of paragraph 1 of the claims.

Thanks envisaged according to the invention the device of the self, which hitherto used exclusively driven by Electromechanical means disc brakes, reduces the need for power brake cylinder, which leads to a significant reduction of the design space at a constant operating characteristics of the brake.

Already with relatively small coefficients of the self is possible a significant reduction in the overall dimensions of the brake cylinder. At the same time, samoushirenie by determining the size of the angles of the wedge or ramp is chosen so that the maximum possible coefficient of friction of the brake linings is the reliable automatic brake is released.

Differently than in disc brakes with an electric motor, the motor should not be used to clamp the brake, and release.

The reduction to structive size may in particular, due to the lower course, which, for example, is reduced from 65 to 24 mm. equally energy required for actuation is reduced to one-third of current energy for actuation.

This allows you to have a substantially smaller elements bearings brake lever, resulting in reduced bending moment acting on the brake lever.

Along with this, the desired and provided by the invention effect is also achieved significant reduction of friction in the bearings, which, firstly, is achieved due to the smaller size and, secondly, due to minimized the required angle of rotation of the brake lever, thereby improving mechanical efficiency.

Given the decrease in the angle of rotation follows from the reduction gear ratio of the lever, which, as already mentioned, is the disc brake according to the prior art of 15.6:1, while it is thanks to the invention is in the range from 7:1 to 10:1, i.e. much smaller.

Using the invention, thus, may reduce the structural length of the brake cylinder, as well as savings in weight, which corresponds related to these requirements, of which in General should fuel economy. In addition, due to the reduced such is the practice of the bend in the brake lever it can be calculated optimized in terms of weight, and brake lever corresponds only with the brake plunger acting in the plane of the axis centreceske relative to the axis of rotation of the disk brake, which built the two arranged for this purpose on both sides of the force with one hand on the yoke disk brake mechanism and with the other hand on the brake pad, located on the side of the clamp, pressure plungers that her reaction brought directly into the bracket brake mechanism.

The brake lever is made mostly in the form of forgings without treatment, is associated with the formation of the chip, and can be formed as a relatively thin-walled forged parts with stamped signs nests bearing, in the form of so-called exact forged parts, or parts, stamped from a sheet. Fundamentally, it is possible to manufacture the brake lever from high-strength cast iron with the subsequent processing associated with the formation of chips.

According to other aspects of the invention, the brake lever is equipped with at least partly going around the curved edge, which when low weight is achieved by increased stiffness. Additionally can be arranged stiffening corrugations and the like.

To increase the strength of the liner brake lever may be hardened or improved.

Installation overall reproductive whom and under bearings, in the form of spherical nests provided for reducing friction and/or wear of coated or lined cups for the bearings connected with the metal.

To drive the device adjustment in the brake lever can be stamped timing circuit suitable for engagement with a drive wheel Adjuster, or may be fixed, for example, by welding as separate items.

Other preferred embodiments of the described features of the dependent claims.

The present invention is illustrated by drawings, which presents the following:

figure 1 - part proposed according to the invention disc brakes, a top view in section,

figure 2 is a perspective view of another part of the disk brake

figure 3 - brake lever disc brakes, perspective view,

figure 4 is a longitudinal section of the brake lever along the line IV-IV in figure 3.

In figures 1 and 2 is a self-reinforcing disc brake with fixed brake shield bracket 1 brake mechanism, a brake pad 3 located on the side of the clamp, and one not shown brake pad located on the side of the counter, which can be pressed to the brake disk 2.

For pressing the brake lining is provided for clamping the device in the form of a brake lever 5 and the brake plunger 6, with which the brake pad 3 from the side of the clamp can move in the axial direction relative to the axis of rotation of the brake disc 2.

When this brake cylinder 18 (figure 2), which can be fed with compressed air through the attached pusher 19 acts on the brake lever 5, the brake lever 5 in the area of impact of the pusher 19 has reference spherical socket 20, which is adapted to the formed convex face side of the pusher 19.

Brake lever 5 can rotate relative to the brake piston 6 around the axis of the Cam, which is formed by two spherical support elements 10, which on one side are in spherical sockets 12 of the brake lever 5 and on the other hand, the protrusions 11 of the spherical nests bracket disc brake mechanism, and the protrusions 11 of the spherical sockets respectively form almost point blank range.

Between the support elements 10 forming both a thrust bearing or intended spherical sockets 13 in the brake lever provided by the convexity 12, adapted to support the ball 9, which is supporting ball 9, which on the other hand is fixed on the brake plunger 6.

Thus the eccentricity of the brake lever 5 determines the distance of the center of the spherical sockets 13 or supporting elements 10 to the convexity 12 Il is located inside the supporting ball 9, moreover, the supporting ball in relation to the reference spherical socket 20 is located above the supporting elements 10.

According to the invention further provide a device of the self which has a sliding bearing, which accordingly is intended push the plunger 7, which are in engagement with the adjusting device 23 for due to depreciation adjustment the brake pads 3.

Push the plungers 7 its facing the brake pad 3 end region secured in the guide plate 4, which can move in the direction of pressure in the brake shield 8.

Each sliding bearing 14 is integrated with the mechanical hand to push the plunger 7 and positioned therein in a sliding bearing 17 supporting ball 16, which is shaped spherical socket recess whose side plate made in the form of a rising ramp 15.

When braking, i.e. when the brake pad 3 with the brake lever 5 is pressed to the brake disk 2, there are tangential force with which the brake pad 3 is shifted in the direction of rotation of the brake disc 2, when you change the distance of the brake pads 3 to the pressure of the plunger 7.

When the brake is released the brake pad 3 via not shown return spring returns to the so-called is decompressed to its original position, in which the supporting ball 16 is practically free from functions in deepening the brake pads 3.

In figures 3 and 4 show an example of execution of the brake lever 5, which is formed as part formed from a sheet.

You can see that the brake lever has an approximately trapezoidal side surface on a side of the protruding both spherical socket 13, while on the opposite end region formed with the same direction of the reference spherical socket 20.

Between the two spherical sockets 13 in the direction of the reference spherical socket 20 on the distance to them is shaped spherical socket bulge 12, namely, with its concave inner side opposite the inner side formations spherical sockets 13 and the reference spherical socket 20.

To stiffen the brake lever 5 it is partly going around the contour of the bent edge 22 that extends in the direction of protrusion of the bump 12 and is absent only in the end region of the reference spherical socket 20. Further, to increase the bending stiffness between the bump 12 and the reference spherical socket 20 is a recess 21.

1. Pneumatic disc brake, contains covering the brake disc (2) bracket (1) disc brake is of echanism, as well as made with the possibility of pressing the brake disc (2) on both sides of the brake pads (3), one side of the clamp is arranged to actuate using the rotary axis of the eccentric brake lever (5) of the clamping device, and the plunger (19) loaded with compressed air brake cylinder (18) is made with impact brake lever (5)and the device of the self, which is the ratio of the self chosen so that the brake after the brake is released automatically, and brake lever (5) is based on at least mounted in the bracket (1) disk brake mechanism of the spherical support element (10), forming the axis of rotation of the eccentric, and adjacent to the ball bearing (9)located in the direction of action of the pusher above the support element (10), and which is positioned in the brake piston (6), which is connected with the brake lining (3), located on the side of the clamp, and on both sides of the brake plunger (6) parallel to and at a distance from each other are, respectively, one pressure piston (7), one end based on the bracket brake mechanism, and the other end through a ball bearing (16) on the brake pad (3), characterized in that the pressure of plunge the R (7) is fixed to the guide plate (4), installed with the ability to move in the direction of the axis of the brake disc (2) in the shield (8) of the brake mechanism.

2. Pneumatic disc brake according to claim 1, characterized in that it contains two of the support element (10)between which is located a bearing ball (9).

3. Pneumatic disc brake according to claim 1 or 2, characterized in that the installation of the support elements (10) brake lever (5) has a spherical socket (13), and to install the ball bearing (9) bulge (12).

4. Pneumatic disc brake according to claim 1 or 2, characterized in that the supporting elements (10) are based on the projections (11) of the spherical sockets of the bracket (1) disk brake mechanism.

5. Pneumatic disc brake according to claim 1 or 2, characterized in that the pusher (19) with the mechanical side is set in the reference spherical socket (20) of the brake lever (5).

6. Pneumatic disc brake according to claim 1 or 2, characterized in that the ratio of the rotating lever i = L1 (the distance between the centers of the spherical sockets 13 to the bearing ball socket 20): e (eccentricity = distance of the center of the spherical socket 13 to the convexity 12) lies in the range from 7:1 to 10:1, preferably of 7.5:1.

7. Pneumatic disc brake according to claim 1 or 2, characterized in that the brake lever (5) is provided at least partially passing through the circumference of the bent edge (22).

8. Pneumatic the ski brake according to claim 1 or 2, characterized in that the rotating lever (5) is made in the form of parts stamped from a sheet, or casting.

9. Pneumatic disc brake according to claim 1 or 2, characterized in that the rotating lever (5) is equipped with at least one recess (21) to stiffen.



 

Same patents:

FIELD: transport.

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EFFECT: perfected simple design, lower costs, longer life and higher reliability.

7 cl, 4 dwg

FIELD: automobile production.

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16 cl, 8 dwg

FIELD: transport.

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EFFECT: higher efficiency of braking, decreased sizes, simplified design, expanded operating performances.

2 dwg

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8 cl, 7 dwg

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24 cl, 1 dwg

FIELD: transport.

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25 cl, 15 dwg

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4 dwg

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19 cl, 5 dwg

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2 dwg

FIELD: transportation.

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44 cl, 42 dwg

FIELD: transport.

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45 cl, 11 dwg

FIELD: machine building.

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1 dwg

FIELD: machine building.

SUBSTANCE: drive consists of cylinder, of piston installed in cylinder, of fixing device in form of conic bushing with conic insertions arranged inside piston cavity, of un-breaking device in form of an elastic element installed between conic bushing and thrust ring movably positioned on cylinder guide, rigidly tied with cylinder, and of device for retracting piston into initial position. The elastic element of the un-breaking device is made as a compression spring. The thrust ring corresponds to press-on bush with radial orifices. The conic bushing of the fixing device is installed with a minimum clearance relative to end surface made inside the piston; the clearance ensures transfer of force of the compression spring to conic insertions. The conic insertions are movably installed in radial slots of the press-on bush and generate friction force along a cylinder guide deliberately overcoming force of the compression spring.

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2 dwg

FIELD: transport.

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EFFECT: fast operation at controlled and regulated braking force.

1 dwg

FIELD: transport.

SUBSTANCE: proposed disk brake block comprises two flanges with appropriate friction linings to allow friction against disk. Said flanges are articulated on ends of two levers driven by brake force source that comprises first piston displacing along first axis A. Brake block comprises also assembly to automatically control the gap between friction linings and said disk. First piston transmits braking force to pusher arranged inside aforesaid source to increase and transmit said force via said assembly and, along second axis B perpendicular to said first axis A, to ends of said levers perpendicular to those where said flanges are articulated with.

EFFECT: higher operating performances.

12 cl, 7 dwg

FIELD: transport.

SUBSTANCE: invention relates to machine building and may be used in automotive brake systems. Proposed device comprises guided connecting element, braking cylinder, braking piston, hydraulic pipeline and emergent braking means. Said guiding connecting element serves to press brake clamp lining against braking surface. Braking piston is coupled with connecting element. Hydraulic pipeline is communicated with braking cylinder. Emergent braking means driven by fluid medium and manually serve to communicate braking cylinder with hydraulic pipeline or pipelines. Emergent braking means comprise braking valve, mechanical and hydraulic transducers.

EFFECT: reliable braking.

18 cl, 2 dwg

FIELD: transport.

SUBSTANCE: invention relates to machine building and may be used in automotive brake systems. Proposed device comprises moving coupling member. The latter is filled with hydraulic fluid to press brake clamp to braking surface. Said moving coupling member is connected with brake actuator to create pressure force introduced via coupling member into brake clamp. Brake clamp is connected via connectors with pressure pickup arranged on vehicle body and comprises thrust cylinder filled with hydraulic fluid interacting with thrust piston. Said cylinder is communicated hydraulic lines with brake actuator. Said cylinder is divided by thrust piston into thrust chamber and thrust discharge chamber. There are adjusting appliances to set braking force subject to preset magnitude by adjusting pressure difference between hydraulic pressure in thrust chamber and hydraulic pressure in thrust discharge chamber.

EFFECT: controlled braking irrespective of actuating force.

18 cl, 2 dwg

FIELD: transport.

SUBSTANCE: lifting machine comprises motor to drive lifting machine shaft 14. Machine brake 20 applies braking force to disc 22 coupled with machine shaft 14 to decelerate or stop said shaft. In compliance with one version, brake 20 actuates shifting element 38 to apply shifting pressure to tong-type braking mechanism to apply braking force to disc 22. Brake drive 48 with deformable material displaces to counteract shifting pressure to control adhesion between braking mechanism 32 and disc 22. Controller varies braking force applied to disc 22 to control input force on said deformable material. Position of braking element relative to rotary part is defined using material input signal magnitude.

EFFECT: higher operating performances.

19 cl, 5 dwg

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