DE7712892U1 - BRAKE WITH AUTOMATIC BRAKE PAD WEAR ADJUSTMENT - Google Patents

Description

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BCHUMANNSTR. 07. D-4000

Tololoiii | 0211 | 683346 Telex ι 08586513 cop d

PATENT LAWYERS. Dlpl.-Ing. W. COHAUSZ Dipl.-Ip.g. R. KNAUF · Dr.-Ing., Dipl.-Wirisch.-Ing. A. GERBER ■ Dipl.-Ina- H. B. COHAUSZ

April 22 , 1977 Note: Alfred Tuschen, Josefa-Berens-Str. 31, 59 ^ 0 Lennestadt Ik

Brake with automatic lining wear adjustment

The invention relates to a brake with, in particular, spring force acted upon, pliers-carried, pneumatic, electric or hydraulically ventilated brake elements and with an automatic wear adjustment device for the brake elements .

Mechanical brakes on transport, conveyor or lifting equipment are mainly operated by spring force. The ventilation or lifting of the brake elements takes place against the spring force acting on them by electromagnetic, electrohydraulic or pneumatic actuating devices. The spring force required for braking should be during the entire Operating time generate a constant braking torque. This requirement can. can only be met on condition that the Suspension travel remains constant. However, since wear occurs on the brake linings and on the brake drum or the brake disc, the path (air gap) between the braking element uri'i also changes Braking surface by the amount of wear. As a result, the braking force also decreases with wear. The diminution

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the braking force after wear of the braking elements can be so great ί

become that the braking force is no longer sufficient to brake effectively '{■.

To prevent wear on the brake pads and the brake drum or |

To compensate brake disc, it is known to use a spring counter |

mechanically readjusting bearings. This increases the release stroke to j

the original setpoint is returned. The reenactment f

can be done manually or automatically. This wear after i

However, adjusting devices have the disadvantage that they the i

are often not able to cope with extreme operational demands and |

elaborate protective devices against dirt and dust required [

to do so. ί

The invention is based on the object of providing a brake of the ^s

type mentioned above, which with a simple structure ' ^:

is practically maintenance-free. ^s;

This object is achieved according to the invention in that the f.

Spring on the braking elements via a cylinder piston assembly i

acts, the piston is arranged floating and the cons'

forms bearing for the spring and its cylinder space via a ί

One-way valve can be filled from a hydraulic accumulator whose \

Pressure on the braking force is biased. |

In the invention, by increasing the hydraulic pole I

sters between the braking elements or the pliers and the ■

In the piston forming the spring abutment, the wear of the ^!

Brake elements and / or the brake disc or the brake drum \ automatically compensated so that the spring deflection of the spring and

thus also their fi .. the braking force decisive spring force ^:

remains constant. :

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This ensures that the hydraulic cushion is enlarged; that a pressure equalization between the hydraulic accumulator and the cylinder chamber of the hydraulic accumulator via the one-way valve to the cylinder space, because since the hydraulic cylinder is preloaded to the pressure corresponding to the braking force, in Hydraulic fluid flow into the cylinder chamber and set the spring to the original value. The one-way valve prevents that when the brake is released, when the spring force increases, hydraulic fluid from your cylinder chamber back into the Hydraulic accumulator can flow. If the one-way valve were not provided, a new one would be used for each new braking process Pressure equalization between hydraulic accumulator and cylinder must take place.

For adjustment purposes, it is useful to unlock the one-way valve to train.

The filling of the hydraulic accumulator and the build-up of pressure in the hydraulic accumulator can be achieved with the brake according to the invention done in a simple manner if the spring is assigned a further spring abutment that is adjustable and with which can be adjusted by a stroke via the spring, which is used to build up the pre-tensioned pressure in the hydraulic accumulator is required.

With this combination of mechanical and hydraulic power transmission can be read on a pressure gauge connected to the cylinder chamber.

The invention is explained in more detail below with reference to a drawing showing an exemplary embodiment. In detail show

7712892 09.1171

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Pig. 1 a brake consisting of a brake disc , brake caliper and actuation device and

FIG. 2 shows the actuating device according to FIG. 1 in an enlarged manner Representation and in axial section.

A brake disk I ₃ which is arranged on a hub la is grasped on both sides by the brake linings 2a, 2b arranged on the free legs of a brake caliper 2. An actuating device 3 is provided for actuating the brake caliper 2.

This actuating device 3 consists of a cylinder -piston arrangement having a cylinder housing h and a piston 5 arranged thereon. The cylinder housing h is closed on the rear by an axially fixed cover 6, which limits the movement of the piston 5 when it is released. The cylinder housing h can be filled with compressed air via a compressed air connection 11.

The cylinder piston 5 has a hollow cylindrical piston rod 14, which serves as a cylinder space for a piston 9. A plate spring 17 is arranged on the piston rod 8 of the piston 9, One of the abutments is the piston 9 and the other abutment is a threaded bushing 7 screwed into the cover 6 form. The free end of the piston rod 8 is guided in the threaded bushing 7 with a sliding and locking ring 10.

The cylinder space 20 formed by the hollow cylindrical piston rod 1h is closed at the end by a control block 18. In the control block 18, several bores 25 are provided, which lead from a hydraulic accumulator 19 via a check valve 22 to the cylinder chamber 20. To measure the pressure in the cylinder space 20, a pressure gauge 21 is connected to the control block 18. For filling and venting the hydraulic

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systems, a vent screw 2k arranged between the check valve 22 and the hydraulic accumulator 19 is used. The check valve 22 can be unlocked by a hand piston 23.

This actuating device is coupled to the pliers 2 via retaining pegs 13 fixedly arranged on the guide bush 12 and retaining pegs 16 which can be locked on the piston rod Ik by means of an adjusting ring 15.

The function of the brake according to the invention is as follows:

In the position shown in Fig. 2, the piston 5 is acted upon with compressed air and consequently the brake is released. If the pressure in the cylinder housing k is released, the plate spring 17 relaxes. It moves the piston 9 to the right in the drawing. The hydraulic cushion in the cylinder chamber 20 transmits this movement to the control block 18 and thus also to the piston rod Ik, to which the one tong arm is connected. The two pairs of retaining pins 13, 16 therefore move away from one another. This movement is ended as soon as the pliers / with their brake linings 2a, 2b come into contact with the brake disc 1. With increasing wear of the linings 2a, 2b and the brake disc 1, this path increases. Without the hydraulic fluid arranged between the piston 9 and the control block 18, the path of the plate spring 17 would consequently also increase and consequently the braking force would decrease. Because hydraulic fluid can flow into the cylinder chamber 20 from the hydraulic accumulator 19 to compensate for pressure as the braking distance increases, the axial distance between the end face of the piston 9 and the control block 18 is increased, so that even after the brake linings 2a, 2b and of the brake disc 1 the path of the plate

17th
feather / does not enlarge. That means the braking force

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remains constant. A prerequisite is, of course, that through the flowing from the hydraulic accumulator 19 into the cylinder chamber 20 Hydraulic fluid, the pressure in hydraulic accumulator 19 does not decrease. By correspondingly large dimensioning in proportion this can be achieved for the required amount of hydraulic fluid in the cylinder space 20.

If the brake is now to be released, compressed air is applied to the cylinder piston 5 via the compressed air connection 11. The two pairs of retaining pegs 13 * 1S move towards each other and the plate spring 17 is compressed. The pressure in the cylinder chamber 20 also rises in accordance with the increase in force of the disc spring. The one-way valve 22 prevents hydraulic fluid from flowing out of the cylinder space 20 into the hydraulic accumulator 19. In the event of a renewed braking process, the spring force can therefore become fully effective without a renewed pressure equalization between cylinder chamber 20 and hydraulic accumulator 19 being necessary.

The hydraulic accumulator 19 can be filled with hydraulic fluid via the hollow cylindrical piston rod I ¹ I and brought to the desired preload. If a sufficient amount of hydraulic fluid has been introduced, the brake calliper 2 is applied and the disc spring 17 is tensioned by means of the threaded bushing 7. The one-way valve 22 is kept open with the hand piston 23 so that a pressure equalization between the cylinder chamber 20 and the hydraulic accumulator 19 can take place. The desired braking force is read on the pressure gauge 21.

Claims (4)

SOHUMANNSTR. 97. D-4000 DÜSSELDORF Telephone! (0211) 683346 Telex: 08586513 cop d PATENTANWÄLTE: Dlpl.-Ing, W. COHAUSZ- Dlpl.-Ing. R, KNAUF · Dr.-Ing "Dipl.-Wirtsch.-Ing. A. GERBER · Dinl.-Ing. H. B. COHAUSZ April 22, 1977 Claims: 1.Brake with, in particular, spring-loaded, caliper-mounted, Pneumatically, electrically or hydraulically releasable brake elements and with an automatic wear adjustment device for the braking elements, characterized in that that the spring (17) on the brake elements (2, 2 a) or on the brake caliper (2) via a cylinder-piston arrangement (9, II), 20) acts, the piston (9) of which is arranged in a floating manner is and forms the abutment for the spring (17) and its cylinder space (20) via a one-way valve (22) from a Hydr-aulikspeicher (19) can be filled, the pressure of which on the Braking force is biased. 2. Brake according to claim 1, characterized in that the one-way valve (22) can be unlocked. 3. Brake according to claim 1 or 2, characterized in that the spring (17) is assigned a further spring abutment (7) is, which is adjustable and with which the piston (9) can be adjusted by a stroke via the spring (17), which is used to build the preloaded pressure in the hydraulic accumulator (19) is required. 4. Brake according to one of claims 1 to 3, characterized in that that a pressure gauge (21) is connected to the cylinder space (20). K / Tn. - 31 165 7712882