DE2113317B2 - Separation device for disc brake automatic compensator - ensures ready resetting of automatic compensator on replacing disc brake pads - Google Patents

Abstract

The separation device is used in an automatic readjustment mechanism which maintains a constant gap in the disc brakes. The readjusting spindle is held in the brake cylinder and a spindle is screwed on a sleeve without jamming. The sleeve is connected with the actuating piston by a friction coupling until the normal gap is reached by screwing on the adjusting spindle. The gap compensation mechanism is readily reset on replacing the brake pads. The bottom of the actuating piston (1) is situated on the end facing the brake disc. Central bore in the bottom of the piston (16) has a step. A pressure valve consisting of a plate (18) seal and a ball (20) is guided axially in this stepped bore. This valve rests on the bottom (12) of the compensation sleeve (11). The friction coupling (13) between the compensation sleeve (11) and the piston (1) is disconnected by a tool placed through the bore (16).

Description

2. Mechanical release device according to Anp, characterized in that between the adjustment sleeve A compression spring (14) is arranged (11) and post-tensioning spindle (5).

3. Mechanical release device according to claim 1 or 2, characterized in that the friction clutch each of a conical surface (13) both in the bottom of the actuating piston (1) as is also formed in the bottom (12) of the adjustment sleeve (11).

Reset the entire l, «u,> iu ,. _u ,,, u, _iu ,, _{6 iUlu} purposes of renewing the brake shoes can be done easily and safely.

According to the invention, this object is achieved by Hat the bottom of the actuating piston on the side facing the brake disc that the central Bore is expanded against the direction of actuation by a gradation that in this gradation one off a washer, a sealing washer and a

Auleaoe uei -. » ^{Is it} · ^this disadvantage too

-κ. - and to provide means with whose help the

wherein the bottom of a Baätigungskolbens i> ^e ° _ksl ^e _RECOVERY comprises _the entire adjusting the central bore, characterized. that the bottom of the actuating piston
(i) on the side facing the brake disc
lies that the central bore (16) against the
Direction of actuation through a step (17) 20
is extended that in this gradation (17) one off
a disc (18). a sealing washer (19) and
a ball (20) or the like. Existing pressure piece ^^ ^ ^

is axially guided, the existing pressure piece is axially guided on the bottom (12) of the Nachstellnui- _{od the existing pressure piece,}

se (11) abuts and bears _se when exposed to a 25 ^ g ^^ _{Nachstellnü of} i and a suitable suitable in, through the bore (16) einfuhrbares ■>'"j ,, _{g By J} h through which

Tool the friction clutch (13) between _{"hrun" e} j _n feasible tool, the friction clutch adjustment sleeve (11) and actuating piston (1) solves lost _between adjustment sleeve and actuating piston.

2. Mechanical release device according to Anspruc ^ i, ^ ^ _Vortej , _{e of the} invention are primarily in

_{that to change the} brake shoe only a simple tool has to be reached into the central bore and then the actuating piston can be pushed back into its original position. Loosening a nut and turning the adjusting spindle, if necessary with simultaneous pushing of the actuating piston from the other side, is thus unnecessary. This considerably simplifies the resetting of the entire adjusting device. It can also be done faster. The risk that individual parts to be solved get lost is eliminated.

The invention is described in more detail below with reference to the drawings:. , ...

Fig. 1 shows a longitudinal section through the inventive Release device;

FIG. 2 shows a detail from FIG. 1 in an enlarged manner Representation in the raised state. An actuating piston 1 is in a brake cylinder 2

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The invention relates to a mechanical release device for an automatically acting adjusting device to keep the clearance constant in the case of partially lined disc brakes with one held in the brake cylinder Adjustment spindle, which is screwed to an adjustment sleeve without self-locking, which is rotatably fixed with the actuating piston via a friction clutch for a long time

is connected until when the brake is applied and exceeded- cm Dtiaugu ^ -'-—

th of the normal clearance the adjusting sleeve to a 50 of a brake caliper 3 out tight, he has a The amount corresponding to the wear of the lining on the central one, narrowing from the brake cylinder base The rear spindle is screwed, the bottom of the recess 4 being fixed in the one in the brake cylinder 2 Actuating piston has a central bore. arranged adjusting spindle 5 protrudes. The after-

Such a release device is in the DT-AS "''''" ^: "' ^J """ ^u ° ^: "° ^cio

58 209 and in Fig. 4 of this publication shown.

In the course of the lining wear, the effect of the automatic Adjustment device of the actuating piston further and further and finally by a maximum

55

60

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permissible lining wear corresponding amount pushed out of the brake cylinder to reduce the lining wear to compensate and not to let the response time of the brakes increase.

When the lining is changed, the actuating piston and the adjustment sleeve must then be in their starting position be returned.

For this purpose, in the case of the Nacnsteiispmuci j "i" arranged by the DT-AS 12 58 209, by " _B i Arranged in the area of the brake cylinder 2, supporting disc springs 8 are held and guided tightly in a bore 10 leading from the brake cylinder 2 to a manual actuation device 9. The adjustment spindle 5 has a relatively steep external thread, while an adjustment sleeve 11 is provided with a corresponding internal thread and on the Adjustment spindle 5 is screwed on. The adjustment sleeve 11 is closed by a base 12, its edge is conically beveled and rests on a corresponding conically beveled surface 13 in the narrowed recess 4 of the actuating piston 1. The two conical surfaces in the actuating piston 1

on the one hand and on the Nachstellhul.se 11 on the other hand are by a compression spring 14 which is arranged in a central blind hole 15 of the adjustment spindle 5 and is supported therein and on the bottom 12 of the adjustment sleeve 11, in clamping contact with one another held.

The bottom of the actuating piston 1 has a stepped, central bore 16, the lower part of the Bore 16 faces the bottom 12 of the adjustment sleeve 11. In a gradation 17 of the bore 16 are a disk 18 and a sealing disk 19 inserted; between this sealing washer 19 and the base 12 the adjusting sleeve 11 is a ball 20. If the tapered edge of the adjustment sleeve 11 on the tapered surface 13 of the actuating piston 1 rests, the bottom 12 of the adjusting sleeve 11 touches the ball 20 intensively and pushes it into place the sealing washer 19, so that the recess 4 of the actuating piston 1 is sealed to the outside and the frictional connection between actuating piston 1 and adjusting sleeve 11 is guaranteed.

If the actuating piston 1 is to be returned to its starting position when the lining is changed, then so a resetting pliers provided with a corresponding extension engages from the side of the brake disc into the bore 16 of the actuating piston 1 and lifts the disk 18, the sealing disk 19 and the ball 20, wherein the cone of the adjusting sleeve 11 of the

ίο conical surface 13 of the recess 4 in the actuating piston 1 is lifted off. Due to the pressure of restoring pliers adjusting sleeve 11 and adjusting spindle 5 screwed due to the small friction radii between the ball 20, the adjustment sleeve 11 with its coarse-pitch thread on the adjusting spindle 5 in its original position, and the actuating piston \ simultaneously also by the pressure of the return forceps into the brake cylinder 2 pushed back.

1 sheet of drawings

Claims (1)

Patent claims: 1 mechanical release device for an automatically acting adjustment device to control the air gap. Teilbelagsche.l · ... brake with an adjustment spindle held in the brake cylinder, which is screwed to an adjustment sleeve without locking. the unscrewed with the Betatihekannten release device outside of the brake caliper a Zr Ia and then ht with a ti aubenzieher the adjusting spindle in the sense that the adjustment sleeve ^ unscrewing back to the raÄspnde. Very often, the actuation piston is stuck in the brake cylinder so that it cannot follow the adjusting sleeve in the axial direction. Κϊηη ös rather the coupling of the adjustment pre-caution between the adjustment, ellhü.se and actuation column. ben and it has to be removed from the Nacnsteiinuise vei!> L-niauui «ι, V..W .....-- hen and esmuu ππ ^ ....-. ^ ----. piston via a friction clutch as long as io the _{brake disc} can be helped β. *,. , ^ ._: ". u: .u "; To bring R ^ mchPtätieune and ^ _{activity wagons} into their starting position. HUIIKSKDIUCII UUCl 1..111V. ..... «-" o 1 ι -, Is rotatably connected until the adjusting sleeve when the brake is actuated and the normal clearance is exceeded is screwed to the adjustment spindle by an amount corresponding to the wear of the lining, "Ι r" ^. ^,. Inncb ^ iKpni a gene
Object of the invention