DE2356203A1 - DISC BRAKE MECHANISM WITH ADJUSTMENT DEVICE - Google Patents

Description

ISHI KAWAJIMA-HARIMA JUKOGYO KABUSHIKI KAISHA

TokI ο, J apan

Disc brake mechanism with adjustment device

Priority: November 10, 1972 / Japan Registration No .: Sho 47-112657

The invention relates to a disc brake mechanism as well as an automatic adjustment device for compensation of clearances or play in disc brakes.

A normal disc brake is operated

Brake pads

by pressing friction pads or / against a brake disc by a piston movable under fluid pressure. At a "negative" disc brakes or back pressure brakes will, however the brake is applied by the action of an actuating spring, that is, the braking process is canceled and the brake disc is released to rotate again and the machine is operated resumed when the piston applies pressure to the actuating spring under fluid pressure.

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Usually the automatic adjustment takes place to compensate for gaps or excessive "air" between the brake disc and the friction pads in such a region jerk off by placing a compression spring between a pressure piston and another I I bo zen and a screw with flour fan thread between the next I I bo Izen and an actuating piston. However, there is a need for a stabilization option for the frictional force between the plunger and the Next I I bo Izen,

The object of the invention is therefore to provide a functional " improved and steplessly working device for a 're-enactment to create the distance between the brake disc and the brake pads.

To solve the problem on which the invention is based, a next pin is operatively connected to a next pin and a spiral spring is provided at the end of the spindle so that the resilience of the spiral spring moves the next pin through a threaded passage, in order to restore the frictional force between a pressure piston and the adjusting bolt as soon as it subsides.

One advantage that can be achieved by the invention is that too great an adjustment is prevented in that the resilient resilience of a corrugated washer, which is arranged between the pressure piston and a cylinder, is greater than the pressure of the next! Ίbolzens, which is caused by the

f
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Torsional force of the spiral spring arranged at the end of the next I I sp i.nde I is produced.

Advantageous further developments of the devices according to the invention Adjustment device emerge from the subclaims.

An advantage of the invention consists in the arrangement of a contact member for an actuating spring, with the help of which the actuating spring is adjustable. Another benefit of the The invention is that a contact member is provided for an actuating piston, with the help of which the piston stroke is adjustable is. "

Another important feature of the invention is the arrangement of a screw in the reaction part, a pliers or Satte I called the arrangement of the disc brake, with the help of which the Pliers can be reset.

The invention also creates one

automatic adjustment for a disc brake with a next I IboIzen which is screwed into a BetätigungskoIben, which under the force of a cylinder? the tong assembly n aer disc brake mounted actuating spring is and which is frictionally connected to a pressure piston ", thereby to tighten the Brake an inner friction pad, which is arranged on the active, cylinder-having side of the caliper, and an outer friction pad, which is arranged on the reactive side of the caliper, against the brake

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ι

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23562 (13

disk to be pressed. At one end one with the adjuster bolt operationally connected waxes-I I spi nde I is one Spiral spring attached. The rotational force of the spiral spring is used to Compensation of one between the pressure piston and the next I I bo Izen occurring from the stan or gap.

It should be noted that in addition to the invention Disc brake mechanism also the automatic adjustment device is of independent importance.

The invention is shown below with advantageous Details are explained in more detail with reference to schematic drawings of 2 exemplary embodiments. Show it:

Fig. 1 shows a section through a disc brake with e.irrer automatic adjustment device according to the invention; Fig. 2 is a cross-section along the line A-A in Fig. T;

3 shows a section through a further exemplary embodiment of an automatic adjustment device according to FIG Invention for a disc brake.

The first embodiment of the invention shown in Fig. 1 essentially has the following components: a tong or saddle arrangement 1, a cylinder body 2, a first cylinder J, a pressure piston 4, an adjusting bolt 5r a square hole 6 in the leg part of the adjusting bolt, a second cylinder J, an actuating piston 8, a fluid chamber 9 on the brake disc side of the actuating piston 8, a fluid inlet opening 10 for this, O-ring seals 11 and 12 for the actuating piston 8, a friction ring I ^ between the pressure piston 4 and cylinder body 2, a snap ring 15, a wave-shaped washer 14 between friction ring 13. and snap ring 15j a

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Ring l6 for a sealing cuff 17, a third cylinder l8, a contact member 19, an actuating spring 20, a snap ring for the contact member 19, an adjusting spindle 22 with a syringe 23, a stopper 24 for the spindle, a spiral spring 25, a cover 26 for Holding the spring, an outer and an inner friction pad 27 and 28, a brake disc 29, and a stationary support part 30. The square hole 6 in the leg part of the adjusting bolt 5 is not limited to a square shape or a notch, but can be any other Device for establishing a drive connection with the adjusting spindle 22 may be replaced.

In the first embodiment shown in FIG. 1, the outer and inner friction pads 27 and 28 are supported on the stationary support part 30 and are pressed against the brake disc 29 by the actuating spring 20 designed as a plate spring in the braking state. ¹ In the case of the outer friction pad 27, this pressing takes place via the tong arrangement 1, while the inner friction pad 28 is pressed against the brake disk 29 by the pressure piston 4.

The pressure piston 4 slides in the first cylinder 3 and is sealed to the outside by the flexible sealing sleeve 17, which extends from the pressure piston Λ to a ring l6 arranged in the cylinder body 3. A profiled annular groove is provided on the inner circumference of the first cylinder 3, in which a friction ring 13, in the direction of the brake disk 29 in front of it a corrugated washer A and a snap ring 15 are arranged, which the friction ring 13 and the corrugated washer 14 in the ring groove holds. The inner circumference of the friction ring 13 is in engagement with

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Outer circumference of the plunger 4.

The pressure piston 4 essentially has the shape of a hollow cylinder with a closed end face which faces the inner friction pad 28. An extension of the actuating piston 8 extends through the open end face of the pressure piston. The actual actuating piston 8 has a larger outer diameter than the pressure piston 4 and is axially displaceable in the second cylinder 7. The sealing of the actuating piston 8 and its extension is effected by O-ring seals 11 and 12 relative to the second cylinder 7 and the cylinder body 2. brake disc side of the actuating piston 8 is located in the fluid chamber 9 * ^d i ^e through a fluid inlet port 10 with pressure fluid acted upon is .

On the end face of the actuating piston facing away from the brake disk 29 8, the actuating spring 20 rests, the other end of which is supported against the contact member 19. The actuating spring 20 and the abutment member 19 are in the third cylinder 18 arranged and held axially by a snap ring 21. The third cylinder ΐδ has a larger diameter than that second cylinder 7 on.

On the face of the contact member facing away from the brake disc 29 19 the stopper 24 is arranged, into which the cover 26 is screwed. Inside the lid 26 is the Spiral spring 25, which is supported with an outer end 32 in the cover and with an inner end 31 in the outer circumference of the adjustment spindle intervenes. As a result of the pretensioning of the spiral spring 25, it has the tendency to rotate the adjusting spindle 22.

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The adjusting spindle 22 is guided in a central bore of the contact slide 19 and protrudes with the tip. 23 in d: as Lach 6 in the thigh part of the sewing wood 5. The handle part of the next elllso crazy 5f- ws ± s1r an external thread 'on:,; . the "with a corresponding internal thread in eipHi- central.:. drilling, · extension 'of the Betätigungsfeolbcns 8 zm & aTnirienwlr.Jct- Am * of the brake disc 29 is facing the end of the ffachste-llbolz-en * 5 in diameter.... widened and lies: with its front side on the inner surface of the closed front wall of the: pressure piston; 4 ^ on ,.

The cylinder body 2. contains the first one in one piece in the axial sequence. Cylinder J >> den. second cylinder ¹ J and: the third cylinder l8.

In the view shown in Fig. Zl are the: Nachs-Hil I spin de I ZZ ,. a & r S / tapf & rr Z4 for d; i & ■ Niac: h: s + € gl I sp i rrdal, -.

"1 "

the spiral spring Z5 scrw. ie: the cover Z6; to, m hold def Fedar z: U: recognize. Fe-rner Q & ht: from: d: i ~ e: se: r Zle: ic: h.n'ung: mtr An I a: g: ee: l ement J] sow Tee the outer end: 3-Z of the Sp i ra ^ lf ed ^ r Z5: out ..

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When in this embodiment the fluid chamber is pressurized, the. Actuating piston 8 to the right moves and causes the pressure piston 4 like together with the one in screw connection with the actuating piston standing next I I bo Izen 5 is moved to the right, whereby between the adjuster bolt 5 and the pressure piston 4 with Hi Ife

and contact of the corrugated washer 14 creates a frictional force / upright preserved. As a result, the pressure piston 4 is removed from the friction pad 28 lifted to release the brake .. When the fluid pressure in the fluid chamber 9 is subsequently released, causes the actuating spring 20 that the actuating piston 8, the Adjustment bolt 5 and the pressure piston 4 moved back together and that the Breras state will then be restored,

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when the pressure piston 4 again with the friction pad 28 in Touched. When the linings of the friction pads 27 and 28 wear out, the Druckkolbeh 4, the next I I bo Izen 5 and the actuating piston 8 shared by the actuating spring 20 moved outwards when this is the frictional force of the friction ring 13 overcomes. If under this condition the F I u i dkamrner 9. zu Releasing the brake is pressurized, but leads the pressure piston 4 no movement over the corrugated washer

or their spring deflection
l4 caused stroke / out, while both next II bo Izen 5 and actuating piston 8 resume their original position. As a result, a game is generated between the pressure piston 4 and the next II bo Izen 5, which leads to the loss of frictional force. The spiral spring 25 is now used to rotate the next I IspindeI 22, and by turning the next I IspindeI, the next II bo Izen 5 is screwed further out of the actuating piston 8 and brought into contact with the pressure piston 4, so that the distance between the brake disc 29 and the friction pads 27 and 28 is automatically balanced again.

According to the invention takes place due to the fact that the resilience of the corrugated washer 14 is greater than the pressure of the next I I bo Izen due to the torque of the spiral spring 25 not too great a readjustment when through the torque of the coil spring 25 of the next I I bo Izen 5 from the Actuating piston 8 into frictional engagement with the pressure piston 4 is rotated because the linings of the friction pads 27 and 28 have worn out. Since 'also the spiral spring 25 is always their Exerting force in the next direction is a state in which no

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Braking takes place when the friction ring 13 breaks and the pressure piston 4 is released, even with advanced wear of the deposits on the friction pads excluded. Through this becomes an important advantage for the safety of the braking mechanism achieved.

Another embodiment of the invention is shown in Fig. 3 shown in which the automatic adjustment device for disc brakes essentially has the following components: a clamp or saddle arrangement 101, a stationary support 102, a brake disk 103, a reactive part the pliers assembly, a screw 105 for pushing back the pliers, an inner friction pad 106, an outer friction pad 107, a guide pin 108 for the friction pads, which is the most stationary Support part 102 is attached, a first cylinder 109, a second cylinder 110 and a third cylinder 111 of the tong assembly 101, a pressure piston 112 arranged in the first cylinder 109, a recess created in the pressure piston 112 113, a snap ring 114, an oil washer 115, a friction ring 116, a ring holder 117, a Actuating piston 118 arranged in the second cylinder 110 with an enlarged diameter area 119 and a Schenke I area 120 and a cavity T21 in the actuating piston, a F I u i dei η I aßöf f nung 122, a F 1 u i cjkammer 123, O-ring seals 124 and 125, one in third cylinder 111 arranged actuating spring 126, a contact member 127 for the Spring, a locking plate 128, a Sch raubbo I ze.n 129, a next I 1 bo Izen 130, which is inserted into the actuating piston 118

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is screwed in and a head 131 and a leg 132 has, a .Next I I sp.i nde I 133 with a head 134 and a Opening 13.5, a contact member 136 for the actuating piston, a locking plate 137, a bolt 138, a Sleeve 139, a Kupp I Eingsf eder 140, a spiral spring 141, a Spring box 142, a contact member 143, a ceiling I assembly 144 with a plate 145 and a bolt and nut assembly 146, an O-ring seal 147 and a screw bolt 148. _ '

In the embodiment? '3, the two friction pads are supported

106 and 107 on the guide pin 108. The outer friction pad

107 is against the brake disk through the reflective part 1θ4 103 while the inner friction pad 106 is pressed against the brake disk 103 by the pressure piston 112. The plunger 112 is also through a flexible Diehtmansehette, the extends from it to the outer wall of the first cylinder 109 ^, sealed to the outside.

The snap ring 114, the corrugated washer 115 and the friction ring II6 -together with its ring holder 117 are similar to the Embodiment according to FIG. 1 arranged.

The one in the first cylinder. 119 axially displaceable pressure pistons has essentially the shape of a solid cylinder, in whose end face facing away from the brake disk 103 the recess 113 is provided, into which the enlarged head 131 of the Adjusting bolt 130 engages.

The actuating piston 11B slides with its greatest extent in second cylinder 110 and also slides with a cylindrical

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Area of smaller outer circumference in the first cylinder 109 · The seal is through an O-ring seal 125 opposite the second cylinder 110 and 109 opposite the first cylinder an O-ring seal 124 ensured. Brake disc side from the area of the actuating piston 118 with the largest diameter is the Pluidkarnner 123> the over the fluid inlet opening 122 is acted upon with pressure fluid. On the side of the area 119 facing away from the brake disk 103 with widened The diameter of the actuating piston 118 continues in a leg region which extends through the interior of the actuating spring 126.

The actuating spring 126 lies on the brake disk side in the area 119 with enlarged diameter of the "actuating piston II8, while the other end of the actuating spring 126 on the abutment member 127 is applied, which in turn via the screws 129 and the retaining or locking plate 128 is fixed inside the third cylinder. The leg area 120 and the actuating spring 126 are therefore located in the interior of the third cylinder 111.

In the central cavity 121 of the actuating piston II8 is the Adjusting bolt 130 is screwed in, which with a leg 132 facing away from the brake disc 103 extends into the central opening the adjusting spindle 133 extends into it. The adjustment spindle 133 is guided in the contact member 136, on which the actuating piston 118 rests on the face when the fluid is applied. That too The abutment member 136 is held in the interior of the third cylinder 111 via the screws 138 and the holding or locking plate 137. -

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The lid assembly l44 connected to the plate l45 protrudes into a sleeve-like port set facing away from the brake disk 103 of the contact member 136 and carries the spiral spring in its interior l4l, which acts on the head 134 of the adjusting spindle 133 via the coupling spring l4o. The plate l45 is with the O-ring seal l47 sealed against the third cylinder 111 and through the screw bolt l48 secured.

The first cylinder with the pressure piston 112 and the second cylinder 110 with the actuating piston follow axially from the brake disk 103 118 and the third cylinder 111 on top of one another. In this order, the inner diameter of the cylinder also increases.

The actuating spindle 133 is against axial displacement by a collar secured. The collar is supported in the direction of the brake disk 103 on the contact member 136 and in the direction of of the brake disk 103 from an.der sleeve 139, which in turn the cover assembly is applied.

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Normally, the actuating spring 126 causes the actuating piston 118, the next I I bo Izen 130 and the Pressure piston 112 pushes the inner friction pad 106 against the brake disc 103 press. Simultaneously with this, the reaction part 104 is the Pliers arrangement pressed the outer friction pad against the brake disk 103. When the fluid chamber 123 is pressurized, whereby the actuating piston 118 compresses the actuating spring 126, however, the brake disc is released and can move Turn freely when the brake is released. When the frictional force is between the pressure piston 112 and the next I I bo Izen 130 due to the Wear of the linings on the friction pads 106 and 107 disappears, compensation takes place in the same way as in the first exemplary embodiment of the invention.

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In this second embodiment, the

Loading of the actuating spring 126 with the aid of the contact member 127 adjustable, which is provided in the third "Zy M n.der 111". The rearward movement of the coil spring 141 is controlled by the

between the third cylinder 111 and the plate 145 of the Cover I arrangement 144 prevents friction ring provided. In addition, the screw bolt 148 is provided for the same purpose.

In the case of this embodiment, it is automatic subsequent adjustment to compensate for a distance or play that occurs when the friction linings wear d. i e tong arrangement 101 gradually further to the active part of the Pliers moved towards and changes their position in relation to the stationary support part. Therefore, it must be used when replacing the friction pad 106 and 107 the tong assembly 101 in its original position be withdrawn. To do this retraction of the pliers To be able to, the screw 105 is provided in the reactive part 104 of the forceps assembly.

It should be noted that here only preferred Embodiments of the invention for counter-pressure disc brakes have been shown and described, while the invention applies in general to other types of disc brakes is applicable.

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Claims (9)

- 16 claims Disc brake mechanism, marked by a pressure piston (4; 112) which is frictionally engaged by a first cylinder (3; 109) of a tong arrangement (1; 101) is held; an adjusting bolt (5; 13O) which is inserted into an actuating piston mounted in a second cylinder (7; 110) (8; 118) screwed in and frictionally engaged with the pressure piston (4; 112) connected is; an actuating spring (20; 126) received in a third cylinder (18; 13 1), which is connected to the actuating piston (8; 118) is in contact; and an automatic adjustment device for the play or the gap of the disc brake, in which the leg of the adjusting bolt (5; 130) with one end of an adjusting spindle provided in the third cylinder (18; 111) (22; 133) is operationally connected, and at the other end of the adjustment spindle a spiral spring (25; 141) is arranged such that the torque stored in the spiral spring exerts pressure on the adjusting bolt when between there is a gap between the adjusting bolt and the pressure piston (4 '; 112), which is automatically compensated. 2. Disc brake mechanism according to claim 1, characterized characterized in that the automatic adjustment device is designed for a counter-pressure disc brake and that the The brake is continuously acted upon by the actuating spring (20; 126), which continuously exerts pressure on a brake disc (29; 103) with arranged on both sides of the brake disc 409821/0855 ■ - 17 - Brake pads (27, 28; 106, 107), and that the brake is releasable when a Flu.idkammer (9; 123) in the second cylinder (7; 110) is designed to move the actuating piston (8; 118) mounted in the second cylinder under pressure will. 3. ' Disc brake mechanism according to claim 2, characterized characterized in that in a stationary support (102) for guiding the brake pads arranged on both sides of the brake disc (103) (106; 107) a recess is formed, and that a guide arrangement for the pliers on the stationary part of the a fixed support is provided that encompasses the disc, 4. Disc brake mechanism according to one of claims 1 to 3, characterized · that a friction ring (13; 116) and a corrugated washer (14; 115) between the first cylinder (3; 109) of the pliers (1; 101) and the pressure piston mounted therein (4; 112) are provided that hold the plunger by frictional force within the first cylinder, the corrugated Washer also causes the plunger to move back to the first cylinder » 5. Disc brake mechanism according to one of claims 1 to 4, characterized in that a friction ring (13; 116) and a corrugated washer (14; 115) between the first cylinder (3; 109) of the pliers (1; 101) and the therein attached Dru ₁ Ckkolben (4; 112) are provided which maintain the pressure piston by frictional force within the first cylinder, and that the overall 409821/0855 corrugated washer (14; 115) has greater resilience than the pressure of the adjusting bolt (5; 13O) due to the rotational force of the spiral spring (25; 141) acting on the end of the adjusting spindle (22; 133) is provided, which is operatively connected to the other end of the locking bolt, the friction verbunderi coherent with the pressure piston (4; 112) / is such that a to 409821/0855 -I ₉ - strong readjustment during the automatic readjustment process Exertion of pressure on the part of the adjusting bolt with the help of the spiral spring is prevented. 6. Disk brake mechanism according to one of claims 1 to 5, characterized in that the actuating spring (126) between that in the second cylinder (110) arranged actuating piston (118) and an AnJageglied (127) is arranged for the spring, the Ln the third cylinder (111) is fitted so that the load of the Actuating spring is adjustable with the help of the contact member. 7. The disc brake mechanism of claim 6, characterized in -that the end of the second cylinder (110) arranged actuating piston I118) from the jm dr i ttert Zy I i Direction (1 IU arranged abutment member <127) for the spring projects outward, and that an abutment member (136) for the piston in the third cylinder (111) is provided so that it rests against the protruding end of the actuating piston such that the stroke of the actuating piston is adjustable. 8. Disc brake mechanism according to claim 6 or 7, characterized g e k e η η ζ e i c h net that the end the next !! spindle (133) with the adjuster bolt (130) is operationally connected, which is in the actuating piston (118) is screwed, which is arranged in the second cylinder (110) 40982 1/0855 from the contact member (136) for the actuating piston inserted into the third cylinder (111) protrudes outwards, and that a coupling spring (140) between the end of the chopping spindle and the spiral spring inserted into the contact member (136) for the actuating piston (141) is provided. 9. Disc brake mechanism according to one of the Claims 1 to 8, characterized in that (103) (ΙΟΙ) the tong arrangement overlapping the brake disc has an active one 0109,110,111) Part with a group of cylinders on one side of the brake disc and one on the other side of the brake disc (104) ordered reactive part, and that a fixed support 002) is provided, which is used to guide the brakes on both sides (106,107) disc brake pads provided for * ^e i ^NEN ausgenonmenen part comprises egg and at the same NEN fixed part which engages over the brake disc and is used for guiding the forceps. TO .. Disc brake mechanism according to claim 9, characterized in that in the reactive part I the Pliers arrangement a screw (105) is provided, which allows the pliers (101) to be withdrawn into their original position Unscrewing the screw against an outer brake pad (107) allows when the pliers are in their position relative to the fixed Support (102) as a result of the automatic Nachstol I process changes. 09821/0855 JM Blank page