DE1555650A1 - Automatic adjustment device for vehicle brakes - Google Patents

Description

DR. ING. F. WUBSTHOFF 1 5 55650 8 MUNICH 9O

DIPL ·. ING. G. PULS SCHWEIÖEHSTHASSB a DH.K.T.FEOHMANN tilmok 22 08 81

XSSXl

¹ MÜWOBXK

1-33 011

j s soarex b ". n

su der; uitei; i.a-inül.

.oirmiugh skin,.

concerning

3 automatic ! Jinatell fitting for

The connection refers to an automatic jinstelorrioirfrung for a hydraulic osf; lt a i'ahraeui.fDrerase, especially a Jeilb brake with a linear J-lock that is between a piston the actuating device and a mechanical, auxiliary actuating device w: is effective either in the cylinder body of the hydraulic actuation or in a second piston is mounted opposite the first piston, the G-esperre werccrr'ackt when awisohen dem a piston and the cylinder body or the second piston there is an excessively large movement "

Such automatic Siinstellvorrichtungen are from the French patent 1 404 109 known and have the

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The advantage is that; 3 no individual adjustment of the hydraulic systems and mechanical actuation devices is necessary to compensate for the wear and tear of the cushions Anjaorduet are »jJie clinics are geiialtan by means of an ocniaucn pen in intervention ϊΛχ the Jtai.ge. Jas iiat the j.'acüteil, that especially ^ roie iofahr beciioiit, dfäii the ..J-inlLön. auü ^ r -jin ^ rii '± ^ erater. and that consequently abrutsoiit when the auxiliary hand brake is v / ird. ijie_ the jrxindun-j is to avoid this ^ .aciv part at vcrl an independent Linsüellvorrioi-öung ju souaffen, dia leio--.it herusxeilen and reliable in 3betrieb i;: to

This goal of "ürfindunr; erreic.it is in an automatic Einstellvorriontung of the type mentioned by dai by providing a Druckstüok, & lcaeQ dis Jiastklinke vf to each i-in 'all Vin ^ reef with the ratchet teeth pre-, ΐ, - \ ianxi the u.ecxianisohe override device is used ο

To make an oversized adjustment in the event of a turn .to avoid the brake, which occurs when braking hard, it is advantageous according to another aspect of the invention, a stop on the itch to put on ir Rast ratchet to the / pus rüoken of the cresperre and an egg for pre-tensioning the pressure back in the direction of the mechanical To provide manual override devices and to ensure that

that the pressure piece in a sealing manner against the 909834/0794

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can slide so there. ^; . the spring gives way when a previous hyo.raulic pressure is reached * -

The invention is explained below with reference to drawings different embodiments explained in more detail.

Fig. 1 is a cross-sectional plan view of one embodiment of an automatic adjustment device Geraüu der ... rfinäung xfor a hydraulic release device oiner brake;

Fi ₀ . Fig. 2 is a plan view of an integral part of an adjustable length device in the actuator of Fig. 1;

Fig. 5 is a similar view of another component the adjustable length device;

Fig. 4 is a side view, partially shown in section of the component according to FIG. 3;

FIG. 5 is a very greatly enlarged detail, shown in cross section, of the component according to FIGS. 3 and 4;

Fig. 6 is a sectional plan view of a second embodiment of an automatic adjustment device according to the invention;

Figure 7 is an end view of a component of a linear lock of the adjuster shown in Figure 6;

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Fig. 8 is a sectional view of a third embodiment of an automatic adjustment device according to the invention for a disc brake with Sohwenkaange;

Figure 9 is a cross-sectional plan view of a fourth embodiment of an automatic adjustment device.

1 of the drawings shows a partially lined disc brake with a fixed body part 10, on which a bracket 11 slides and in the transverse direction to the disc not shown ». is movably attached. Brake pads 12 and 13 are of this type arranged so that they can engage opposite sides of the disc. The body is with a continuous Bore 14 is provided in which opposing pistons 15 and 16 are slidably mounted. The directly operated pillow is supported on the piston 15 and is actuated by it, incidentally, the piston is prevented from rotating by these cushions. The piston 16 stands with the bracket engages and acts on the same and at the same time is prevented from rotating by the bracket. That indirectly actuated cushion 13 is supported on the bracket.

A mechanical manual override (e.g. a Handbrake or other type of brake normally used for parking or emergencies) has an eccentric

17, which rotates in a transverse bore 18 in the piston 16 909834/0794

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is stored · The eccentric 17 acts on the piston 15 over a locking mechanism 20 of adjustable length and a transmission element 19 · a lever 21a is attached to the eccentric, to turn it, and an adjustable stop, not shown, is provided to restore the normal rest position of the To determine eccentric 17 »

The locking mechanism 20 comprises a pair of locking components 21 and and a Druokstüok 23, with the shaft part 42 the transmission element 19 is engaged. The locking part has a knurled head 24, which under Druok in the Bottom of the hollow piston 15 is inserted. The part 21 is shown in Fig. 2 on a larger scale and comprises a rod, those over the largest part of their circumference with rows of Hasty teeth 25 is provided. The ratchet teeth are formed by a corrugation extending in the circumferential direction, interrupted by elongated grooves 26 in part 21 is. The part 22, which is shown in detail in FIGS comprises a sleeve, 27, which is formed with longitudinal sole seats, which over most of its length rows so that four resilient fingers 29 are formed. the free or distant ends of the fingers 29 are connected to a Corrugation 30 is provided, which is formed complementary to the corrugation on part 21. As a result, the fingers 29 act as pawls, which are biased into engagement with the corresponding teeth 25 on part 21 by the spring force inherent in them are. The shape of the corrugation 30 is very strong

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enlarged detail drawing egg Fig. 5 shown. As can be seen from this figure, the corrugation has the shape of a saw profile thread, the vertical flanks 31 of which serve to transfer pressure to a corresponding flank of the corrugation on part 21. The opposite, inclined flanks 32 make it possible that the corrugations slide over one another when the locking mechanism is further geriiokt for the purpose of adjustment. Suitably, the corrugations are designed in the form of a spiral with a small pitch, as in the case of a screw thread with a small pitch, in order to facilitate their manufacture; however, no screwing operation occurs in the adjustment device according to the invention. On the other hand, the corrugations can also be ring-shaped. The Druokstiiok 23 is hollow and serves to accommodate the locking part 22, as FIG. 1 shows. The pressure piece 23 is provided with an inner, conical surface 34 which is normally in engagement with a corresponding conical surface 35 (Fig. 4) near the free ends of the fingers 29 of the part 22. 'ιΐβϊχη so the Druokatüok 23 over the If Kähne has exerted pressure on the piston 15, this pressure is transmitted to said conical plane, and the reaction resulting there has an inwardly directed force component which acts on the fingers to make them more firmly and necessarily in engagement with the corrugation on the part 21 to press, so that the possibility that the lock slips is effectively avoided.

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At its end facing away from the eccentric 17, the pressure piece 23 has an inner flange which forms a stop 46 for part 22, and there is normally a predetermined clearance between this stop and part 22. A compression spring 37 acts between a spring ring 3Θ on the pressure block 23 and a cup-shaped part 39, which is resiliently snapped into a groove in the piston 16 to press the pressure piece 23 against the eccentric 17, which thereby normally rests against the above-mentioned adjustable stop is held. An annular part 40 is fitted into the piston under pressure and provided with a tongue 41 which engages with a cap in the pressure block 23 in order to prevent it from rotating Bore in the piston 16 attached in a sealing manner. The pistons 15 and 16 are in the bore 14 by means of sealing rings 44 attached.

The locking mechanism 20 acts as a spreading that the movement the pistons 15 and 16 are limited in the direction of one another, when the brake is in rest position. When the brake is applied by being under pressure Brake fluid into the space between pistons 15 and 16 is directed, then these pistons are pressed apart to apply the pads 12 and 13 air the disc. Normally the relative movement makes between the pistons 15 and 16 less than the sum of the space between part 22

and the stop 36 and the pitch of the ratchet teeth, so that 909834/0794

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no setting is made. Should be due to wear and tear If there is an excessively large relative movement between the pistons of the cushion, part 21 becomes compared to part 22 Shifted so far to the left that the locking mechanism moves further in order to effect an automatic adjustment, i. e. the The spreading formed by the locking mechanism is slight extended so that the pistons do not move so far towards each other when the brake pressure decreases. Becomes the auxiliary brake applied, a brake application causing pressure is applied by the eccentric 17 between the pistons through the Transfer lock. This causes the corrugation on the fingers 29 necessarily against the corrugation 25 on the Rod 21 is pressed, as already described above.

If the adjustment device after replacement, more worn If the cushion is to be readjusted by new cushions, the piston 15 can be rotated 45 to to bring the corrugation 25 on the rod 21 out of singular engagement with the corrugation 30 on the part 22. Then the piston can be pushed inward to the length of the locking mechanism a minimum before a new gravel 12 is used.

The embodiment of the adjustment device according to FIGS. 6 and 7 is used in a similar hydraulic one Actuating device as shown in Fig. 1 and the corresponding parts are with the same

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References are provided and will not be repeated here ". The locking mechanism 50 according to FIG. 6 comprises one component . 511 that can interact with a number of ratchet teeth, which by a corrugation 52 on the inner surface of the Hollow basket 15 is formed. It also includes locking a pressure piece 531, with which the transmission element 19 'in Engagement is. The part 51 is shown in detail in Fig. 7 and has the shape of a sleeve with wide Longitudinal soles 54 are provided around two resilient fingers 55 to build. The fingers 55 have an outer corrugation 56 provided that meshes with the corrugation 52 in the piston 15, daduroh these corrugations act as a pair of pawls. The compliance the finger 55 tensions.die corrugation 56 against the Corrugation 52 in front. The Druokstüok 53 has an outer conical surface 57 provided with a corresponding inner conical surface 58 near the i'ingerenden 55 is in singing. So if the Druokstüok 53 transfers pressure to the fingers 55, so has on the surfaces 57 and resulting reaction an outwardly directed force component, welohe the corrugation 56 on the fingers 55 tighter and necessarily presses into engagement with the corrugation 52. A Ansohlag 59 for part-51, which in a predetermined distance of this part • is arranged by a plate 60 - formed on the Druokstüok 53 by a knurled

Bolt 6t is attached, which is inserted under pressure into a hole in the end of the 5eila 53. The plate 60 is in grooves 64 in the end faces of the resilient fingers 55 909834/0794

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S.

arranged to prevent the sleeve 51 from rotating with respect to the pressure block 53 and thus with respect to the piston 15. A compression spring 62 acts between a spring ring 65 on the pressure piece 53 and a cup-shaped file 64 which is held on the piston 16 by a spring ring 65. The cup-shaped part 64a includes a finger 66 which engages in a hat in the pressure piece 53 and a finger 67 which engages in a hole in the piston 16 in order to prevent the pressure piece 53 from rotating relative to this piston. The spring presses the pressure piece 53 against the eccentric 17 and thereby presses the lever 21 against a connector., _; : 68. The automatic control device according to FIGS. 6 and 7 acts in the same way as the adjustment device shown in FIGS. The main difference between the two 7orriohtungen is that according to Fig. 1 the iYlinken formed by the fingers duroh the pressure resulting from the actuation of the mechanical actuator near the inside against hasty teeth on the rod 21, while according to FIG. 6, the resilient fingers 55 naoh be pressed outside against ßa3tzähne on the piston 15 itself.

Two not shown, diametrically opposite one another,

inner, elongated grooves are formed in the piston 15, to

in order to interrupt the corrugation 52 in the circumferential direction. If *

ω the adjustment device can be redistributed from scratch '·

- ^ jJ should, for example, the replacement of worn naoh Kiaatn against new · ^r

• "" 4 ■ '- ¹ '"

co gravel, then the piston 15 can be rotated 90 ° to the to bring linger 55 out of engagement with the corrugation,

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and then the piston 15 can be pushed inwards in order to limit the length of the locking mechanism to a minimum before a new cushion 12 is inserted.

jPig, 8 shows an automatic adjustment device according to the invention in application to a brake with swiveling pliers. The hydraulic actuator comprises a swivel body part 70 which is articulated at 71 and an indirectly operated cushion 72 supports. An annular piston 73 is in a bore 74 in body part 70 Slidably mounted and acts on a directly operated cushion 75. A cover 76 attached to the body part 70 closes the end of the bore 74 '' A mechanical override priority comprises an eccentric 77 rotatably mounted in the cover 76 and acts via a transmission element 78 and a locking mechanism 79 on the piston 73. The cover 76 has a protruding into the interior of the annular piston 73 Federal 80 provided. Diaphragm rings 81 and 82 seal the annular piston 73 with respect to the bore 74 and the collar 80, respectively from ο.

The locking mechanism 79 corresponds essentially to the locking mechanism

ο 20 according to Fig. 1 and comprises a ..-- part 84 (corresponds to the co.

■ JJ ^r feil 21), which is attached to the piston 73, a part 85

v. (corresponds to part 22) and a printing block 86 (corresponds to ο.

^ dem- Brucksttick 23), on which the transmission element 78 cc

- The pressure piece 86 is hollow and part 85 is in it

recorded. The pressure piece 86 has an inner conical

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surface 87, which cooperates with a corresponding surface 88 at the ends of resilient fingers, the fingers having the task of illinking and being formed by a sleeve slit in the longitudinal direction, -which the part 85 represents. The ¹ I ¹ GiI. 86 also have an inner flange which represents an attachment 89 for part 85.

A compression spring 9C acts between a spring ring am 'feil 86 and a spring ring 92 within the collar 80 to the part 86 against the eccentric 77 and thereby the To press the eccentric against its stop, not shown.

The automatic jilinst part device according to FIG. 8 acts essentially in the same way as the device according to FIG. 1 "A fundamental difference" exists in that the linste 11 device does not get into the brake fluid immersed when this is fed to a Hin; kaimuer 92 surrounding the outside of the collar 80. Kin Another difference is that the eccentric 77 in the cover 76, which effectively forms a part of the body 70, is rotatably mounted instead of in a piston 73 opposite piston.

9 shows a modification of an adjusting device according to FIG. 1 with a device that prevents excessive adjustment in the event of braking distortion during heavy braking

prevented. The implementation according to Fig. 9 is in 909834/0794

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general that in i'ig. 1 shown embodiment very similar, and associated parts are with them Provide reference numbers. However, the printing at the 23 replaced by a similarly trained print shop 123, which engages by means of a dioh ring 102 stands with the blind bore 101 of the piston 15 In addition, the ring-shaped part 40, which is the pressure support 123 prevented from rotating with respect to the piston 16, by replacing a bracket 140 which sioh between them the Druckst üok and the piston 16 streokt.

The ratio between the diameter of the bore 101 in which the pressure piece 123 is attached and the force of the spring 37 is such that the force of the spring is overcome and the part 123 is moved to the left by the hydraulic pressure piece when a predetermined pressure is reached. This pressure is so large that all of the Brema's leeway is filled, but the cushions 12 and 13 are not applied to the disc with great force. As long as this predetermined pressure is not reached, the procedure in connection with Ji ¹ Ig. 1, Weiae explained an automatic adjustment when the cushions are worn. As soon as the brake pressure exceeds the predetermined pressure, however, the pressure piece 123 is pressed near the left against the locking part 22 "and no further adjustment can take place." This guarantees that

a deformation of the brake ( e.g. bending the bracket), the 909834/0794

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with heavy braking. ν or come η can, does not cause too great a position

The patient is contested

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Claims (12)

DR. ING. F. WUJäSSHÖFF _ _ '- _ ^ S MlfrWÖHBÜf OO DIPL ·. 2N0.G. TXiUS 1555656 WHÖSMTHA « (to 1Δ-33 011 Claims 1 * Automatic adjustment device for a hydraulic Actuating device of a vehicle brake, in particular a partial covering with a linear locking mechanism, which is effective between a piston of the actuating device and a mechanical auxiliary actuating device, those in the cylinder body of the hydraulic actuation device or is arranged in a second piston opposite the one piston and which is advanced when there is an excessively large movement between one piston and the cylinder body or the second piston, characterized by a pressure piece (23), which the quick pawl (29) necessarily in singriff with the .! load teeth (25) presses when the mechanical manual override is created. 2. Automatic adjustment device according to claim 1, marked by the fact that the mechanical iülfsbetichtungseiarichtung comprises an eccentric (17), in the cylinder body or in the second piston (16) by one Axis is rotatably mounted, which'zu the axis of the hydraulic 909834/0794 BAD C ' ^;' ^m -fc- 1555660 Actuating device runs vertically, and the Druokstüok (23) works. 3. Automatic adjustment device according to claim 1 or 2, daduroh ge ke η η ζ e is worthwhile that the Druokstüok (23) normally with the pawl (29) in the direction of the pressure via an inclined iläohe (34 _f 35) in engagement . 4. Automatic iüinstollvorriohtung according to claim 3, daduroh g e k ο η η ej e i c h η e t that the locking (20) has several pawls in the shape of fingers (29), which are supported by a sleeve (27) slotted in the longitudinal direction are formed, and that the xteihe of ratchet teeth from one Row of corrugations extending in Uiaf orientation (25) is formed. 5. Automatic adjustment device according to claim 4, characterized in that on each Pinger (29) has a corrugation extending in the circumferential direction (30) is located, which is designed to be complementary to the corrugation (25). 6. 'Automatic adjustment device according to claim 4 or 5, characterized in that the Corrugation (25) extending in the circumferential direction in the form a saw profile screw thread is formed with a small pitch. 90 9 834/0794 BATH ORIGINAL 7. Automatic adjustment device according to claim 4, or 6, daduroh g β k e.rrn a β i ο h η e t that the the corrugation (25) forming the Beihe Haatzöhne in circumferential direction art longitudinally aligned stalls üntarbrookan is, so that duroh an angle shift longitudinally hollowed-out sleeve (27) opposite the Heihe Hastaähne the left (29) for the purpose of re-setting the öesperres disengaged of adjustable length can be. 8. Automatic Sinstellvorrichtung according to one of claims 4 .to 7 _t, characterized in that the Heihe of the circumferentially extending Elffeiung (25), which forms the row Hastaähne, is formed on a rod (21) extending from the piston (15) , and that the pressure piece (23) is hollow and provided with an inner conical surface (34) by which it normally engages with correspondingly inclined surfaces (35) near the ends of the fingers (29) (Fig. 1 to 5, 8 and 9). 9. Automatic adjusting device according to one of claims 4 to 7 _t, characterized in that the circumferentially extending Hiffeiung (52), which forms the Heihe locking teeth, is formed on the inner surface of the hollow piston (15), and that the 909834/07 9 4 BATH ORIGINAL AS Druokstüok (53) is formed by a rod which extends within the longitudinally seated sleeve (51) and is provided with an outer conical surface (57), duroh aie norniclerweiae with correspondingly inclined surfaces (58) near the ends of the I-'inger (55) in singles 3teht (Ji ¹ Xg, 6 and 7). 10. Automatic adjustment device according to one of the Claims 1 to 8, geke η nse leans through a stop (36) provided on the pressure piece (23) on which the left hand (29) is applied to move the locking mechanism (20) further. 11. Automatic sinusoidal device according to; Claim 10, g e k e η η ζ e i c h η e t by a t spring (37) which the pressure piece (23) in the direction of the mechanical auxiliary actuation device (17) pretensioned. 12. Automatic Sinstellvorriohtun »: Geraäi claim 11, thereby g e *: e η η s e i. σ h η e t, since the pressure piece (23) in sealing ./ei3e opposite the piston (15) slippery so that each (37) gives way when a predetermined hydraulic pressure "is reached (i? ig. 9). 90983A / 0794 BATH ORIGINAL