DE19858608A1 - Process and locking arm fitting tool for automotive disc brake simplify fitting spring cup in bore hole and minimise risk of fitting damage - Google Patents

Abstract

In a process to fit a locking arm (26) with a spring cup (24) in a bore hole (2) forming part of a disc brake cylinder (3). The spring cup (24) is taken up by a tool (40) which pre-tensions the locking arm (28). The tool (40) and cup spring (40) are introduced to the bore hole (2). The spring cup (24) is moved within the bore hole (2) to release the locking arm (26).

Description

The invention relates to a method for the assembly of a Spring cup having locking means in an inner bore. The invention further relates to a method for demonta ge of a locking means having spring cup, which in a Inner bore is mounted. The invention also relates to a tool for the assembly and / or disassembly of a rest medium spring cup in an inner bore, esp especially to carry out the assembly and / or disassembly driving. Such a spring cup is in particular in one Brake cylinder of a disc brake with adjustment device intended.

DE 41 21 054 A1 describes an actuating device for a disc brake known. In the actuator a stepped cylinder is provided in an inner bore, in which a piston axially due to the braking pressure exerted is movable. The power transmission to the piston follows via an adjusting device that is the same constantly in their length due to the wear of the covering itself changes the position of the piston in the cylinder and so the way minimized for the mechanical actuator. The  Freeing spring when the brake pressure drops. The spring pot points at its open end over the circumference of the pot casing distributes pot jacket slots, the thus formed Limit locking arms. These locking arms are in one in the inner bore of the cylinder can be snapped into place. This fixes the spring cup in the inner bore.

The pot casing has a lower pot bottom cut open in which the compression spring is guided. Outdoors The end of the pot casing, i.e. in the area of the locking arms, is the Pot shell diameter a little larger so that the Locking arms of the spring cup when inserted into the inner bore radial from a ramp provided in front of the inner groove be pushed inwards.

The assembly is therefore as follows: first the Center the piston in the inner bore, then the spring cup with the compression spring added. The inner bore has a stepped bore, the Fe the pot in the rear step section with a smaller opening knife must be introduced. It is difficult to Spring cup against the spring force of the compression spring in this stu center section. One in this stage section provided inner groove has an upstream ramp, wel che the locking arms radially after inserting the spring cup inside presses. During the entire insertion process of the Fe dertopfes there is a risk that ra of the locking arms dial outward protruding edge the wall of the inner bore scratched (chip removal). This is particularly a problem  when working with soft materials, such as aluminum (which is preferred for a lightweight construction). The ramp is coming inevitably in contact with the pointed edge of the locking arm randes, since it serves the latter radially inwards to press. Therefore, in particular the material of both Ramp and the locking arms injured.

Furthermore, in the known way of installation is a destruction Free dismantling of the spring cup is not possible. So that's a recycling that is gaining in importance today components excluded.

The invention has for its object the assembly or Disassembly of such a spring cup into an inner bore to simplify or enable, accelerate and to improve in such a way that as little material as possible is injured, and to create a tool for this.

The invention solves the above-mentioned assembly process ren the task of the invention with the characteristic Part of claim 1.

Then in the assembly method according to the invention in a step a) the spring cup in a tool men, which biases the locking means, in a step b) the tool, including the spring cup, into the inner bore tion introduced, and in a step c) the spring cup in moved out of the tool within the inner bore such that the bias of the locking means is released. Advantage  the spring cup in the tool comes through not in contact with the inner bore during the insertion phase a brake caliper, which prevents material damage. Furthermore, none is advantageously inserted in each inner bore built assembly aid (ramp) necessary. By moving the Spring cup from the tool that comes with the release of the front tensioned locking means is coupled, a movement ab given for the critical locking means, which during the phase of moving the spring cup out of the tool oh ne material contact between the locking means and sections of the Inner bore gets along.

To simplify assembly, preference is given to step c) the spring cup using one against the bottom of the spring top pressing ejection means moved out of the tool.

In step c), the spring cup with the aid is also preferred the ejection means moved so far from the tool that the Latching means in a correspondingly offset counter locking device snaps into the inner bore. Must be advantageous only the ejection means are moved sufficiently to to fix the spring cup in the inner bore.

In step a), a spindle in a recess is preferred tion of the ejection means added, and in step c) Spindle by the movement of the ejection means in a be installed in the correct position. Become an asset hereby at least simultaneously with an assembly process three built-in modules, namely spring cup, accommodated therein  Compression spring and spindle as one with the tool one egg easily manageable unit installed.

The invention solves the above-mentioned Demontagever drive the task of the invention, especially a De to enable assembly, with the characteristic part of the An Proverbs 4

According to the disassembly method according to the invention Step a) the spring cup within the inner bore recorded in a tool that the locking means pre- is clamped, and in a step b) the tool is velvet the spring cup taken out of the inner bore. This is the first time that a non-destructive De is advantageous assembly possible. In addition, the demon according to the invention day procedure essentially a reversal of Montagever driving. Furthermore, for both methods, the same be used tools.

To simplify disassembly, it is preferred in one Step c) the spring cup with the help of a against the bottom of the Spring ejection means pushing out of the tool moves.

The invention solves the for the tool mentioned task according to the invention with the characterizing part of Claim 6.

The tool according to the invention then has a recess  for receiving the spring cup, which is designed in such a way is that the locking means in front of the spring cup tense. The spring cup can advantageously be accommodated in the Tool does not come into contact with the inner bore, what allows a gentle installation.

For easy release of the received spring cup has the tool preferably has a separate design ejection agent.

The recess is preferably continuous, wherein particularly preferably the ejection means in an outer Ab cut and the spring cup in an inner section of the Recess is added. The tool can be advantageous hereby particularly simple and with increased functionality getting produced.

A step-like stop is preferred in the recess designed to hold the ejection means on one side. Thanks to the step-like stop, the ejection means is choppy After inserting the spring cup in the correct position fixable.

The diameter of the inner section is preferred Recess to the diameter of a substantially conical adapted jacket portion of the spring cup. Advantageous the spring cup before ejecting, in particular by an elastic configuration of the jacket section held frictionally in the tool. This adjustment can  be chosen so that the Fe recorded in the tool dertopf unhindered its resting position after ejection can take.

To facilitate assembly, the tool is for a centering te receptacle in the inner bore, in particular cylindrical, educated.

The invention is described below on the basis of a preferred embodiment Rungsbeispiele with reference to the accompanying drawings explained. The drawing shows:

Fig. 1 shows an embodiment of a brake cylinder of a disc brake with adjusting device in longitudinal section;

Fig. 2a, b an embodiment of an inventive, in the brake cylinder of Figure 1 einbauba ren spring pot each in a perspective view and in sectional view;

Fig. 3a, b show two views of a further variant of a spring pot according to Figure 2 with axial stop tabs on the locking arms. and

Fig. 4 is a cross-sectional view of the brake cylinder of Fig. 1 showing the assembly method according to the invention including the assembly tool.

In Fig. 1 is a part of a brake housing 1 a Schei benbremse with an automatic adjusting device shows ge, which is arranged inside a cylinder bore 2 of a Bremszy cylinder 3 . The brake cylinder 3 belongs to egg ner hydraulic actuation device which has a brake piston 4 axially displaceable in the brake cylinder 3 . The brake piston 4 is sealed against the cylinder bore 2 by means of an elastic sealing ring 5 and protects against contamination by means of an elastic folding sleeve 6 . The interior 7 of the brake cylinder 3 is filled with hy draulic fluid.

For the hydraulic actuation of the brake cylinder 3 , the hydraulic fluid in the interior is pressurized. The hydraulic pressure pushes the brake piston 4 to the left out of the brake cylinder 3 in order to press on a brake disk (not shown).

The brake housing 1 is also equipped with a mechanical actuation device 8 , which essentially has a rotatably mounted actuating shaft 9 , a pressure piece 10 , egg ne axially displaceable and rotatably mounted spindle 11 and a screwed onto the spindle 11 nut 12 . The nut 12 is formed in one piece with a coupling element 13 , which is provided with a conical friction surface 14 . Inside the hollow brake piston 4 , a complementary friction surface 15 is provided, to which the ko African friction surface 14 can be pressed. The spindle 11 and the nut 12 are connected by a self-locking thread 16 .

For the actuation of the mechanical actuation device 8 , the actuation shaft 9 is mounted in a roller bearing 17 in a friction-free manner. The pressure piece 10 is seated in an eccentric recess 18 of the actuating shaft 9 . The spindle 11 has a guide section 20 which is guided in a guide bore 21 of the brake housing 1 and is hydraulically sealed by means of a sealing ring 19 . Furthermore, the spindle 11 is provided with a plate 22 , which serves as an abutment for one end of a wire spring 23 , which in turn is accommodated in a spring cup 24 (spring cage) and with its other end lies on the pot bottom 25 .

The spring cup 24 engages in an inner groove 27 in the cylinder bore 2 via elastic locking arms 26 . Due to the geometry of the spring cup 24 (see also Fig. 2a, b and 3a, b), the locking arms 26 have a bias in the installed state, so that centering in the brake housing 1 is ensured. Thanks to the flexible design of the locking arms 26 Win can kelabweichungen individual locking arms 26 are compensated during installation in the brake housing. 1 That is, the tolerances for the angular position of the locking arms 26 can be chosen to be correspondingly large.

The inner groove 27 is provided in a second step section of the four-step cylinder bore 2 , the diameter of which is slightly smaller than that of the first step section on the output side. The wire spring 23 exerts an axial force in the drawing to the right against the actuating direction via the plate 22 on the spindle 11 (return spring). The spring cup 24 is used in the combination saddle to absorb the axial forces of the wire spring acting as a compression spring. Both the spring cup 24 and the wire spring 23 are responsible for resetting the spindle 11 .

Arranged in the interior of the brake piston 4 is a second wire spring 28 which presses with one end against a stop 29 formed on the brake piston 4 and with its other end against a movable disk ring 30 . The axially movable union, non-rotatable disc ring 30 presses via a ball bearing 31 axially against a bearing surface 32 of the rotatable mother ter 12 , whereby this in the drawing to the left with its friction surface 14 on the friction surface 15 of the brake piston 4 is pressed ge. As a result, the friction clutch formed between the friction surfaces 14 and 15 always remains closed when the disc brake is not actuated.

In FIGS. 2a and 2b is a ter according to the invention having formed spring cup 24 cut in perspective view and in cross in the uninstalled state shown (unstressed). The crown-shaped spring cup 24 has the ring-shaped pot base 25 and a pot shell or wall, which in the present embodiment is in the form of several, in particular six, locking arms 26 . The Rastar me 26 are concentric and equidistant around the circumference of the pot bottom 25 . The wide slots between the locking arms 26 guarantee good ventilation of the brake system. At least two are required for a secure resting position. Locking arms 26 required, the number is not limited upwards. The spring cup 24 is preferably a stamped sheet metal part.

Each locking arm 26 has four sections which have the training and functions explained in more detail below.

An innermost pot bottom near, substantially perpendicularly projecting from the pot bottom 25 first section 26 a serves the Zen tration of the wire spring 23 within the spring cup 24th For this purpose, the pot casing on this section 26 a has an inner diameter which corresponds essentially to the outer diameter of the wire spring 23 .

The first section 26 a merges into a second section 26 b, which is used to thread the spring cup 24 into an assembly tool ( FIG. 3) and to bias the locking arm 26 . For this purpose, this section of the pot casing is designed to open conically.

The second section 26 b is followed by a third section 26 c, oriented essentially perpendicular to the bottom of the pot, which serves to guide the spring cup 24 in the brake housing 1 . In the installed state, the third section 26 c lies on the inner wall of the second step section of the cylinder bore 2 .

On the pan floor 25 the opposite end, the latch arm 26 a of the section 26 c adjacent portion 26 d, which may also be referred to as a claw, on wel cher is used for snapping or snapping of the spring cup 24 in the internal groove 27th For this purpose, section 26 d is bent or flanged outwards, essentially parallel to pot bottom 25 .

In general, the spring cup 24 described above can have yet another function, namely the limitation of the movement possibility of the spindle 11 in the application direction of the combined brake. This serves to prevent leaks of the hydraulic brake, inter alia, at very large displacement of the brake piston 4 due to strong brake lining wear. Such a limitation of the axial Ver displacement travel of the spindle 11 can, for example it follows that on the spindle 11 adjacent plate ring 22 from reaching a particular displacement path of the spindle 11 at a portion of the spring cup 24 abuts (see Fig. 1). Here, the comparison with FIG. 1 radially enlarged Tel proposes lerring 22 especially at the end portion 26 d of the latching arms 26 on.

In the Fig. 3a, b shows a further variant of the Federtop fes 24 shown in which the Verschiebewegbegrenzung the spindle 11 is converted to an other advantageous way. Here, several, in particular all locking arms 26 angled stop tabs 52 , on which the spindle 11 either reaches directly when reaching a predetermined displacement path or strikes via the plate ring 22 shown in FIG. 1. Fig. 3 shows only one embodiment of these stop tabs 52 , which of course can also be designed differently. Overall, the flaps 52 are formed in the simplest way, preferably during the manufacture of the spring cup 24 as a stamped sheet metal part.

FIG. 4 shows a cross-sectional view of the brake cylinder 3 to show the assembly method according to the invention and the associated assembly tool 40 .

The assembly tool 40 is constructed in two parts and has an essentially sleeve-shaped outer part 41 and an essentially piston-shaped ejection means 42 , which can also be referred to as a stamp. The outer part 41 is divided into a handle portion 43 and an insertion portion 44 . The insertion portion 44 has an outer diameter which corresponds to the inner diameter of the first step portion of the cylinder bore 2 , whereby the assembly tool 40 can be centered therein. The front end 45 of the insertion section 44 is conical in order to facilitate the insertion of the tool 40 . The handle portion 43 has a slightly smaller outer diameter than the A guide portion 44 . Furthermore, a circumferential groove 46 is ausgebil det in the handle portion 43 for gripping the tool 40 .

The outer part 41 has a stepped through-hole 47 , the front step 48 of which forms a recess for receiving the three sections 26 a-c of the spring cup 24 . The inside diameter of the front step 48 is adapted to the outside diameter of the spring cup 24 . In the rear stage 49 , the ejection means 42 is slidably guided. For this purpose, the inside diameter of the rear section 49 corresponds to the outside diameter of the ejection means 42 . The transition from the first 48 to the second stage 49 acts as a stop for a front radially outwardly projecting section 50 of the ejection means 42 .

The ejection means 42 has a stepped through-hole 51 , the front step of which, with a larger inner diameter, serves to receive the spindle 11 . The inside diameter of the front step 51 is slightly larger than the outside diameter 11 . The axial depth of the front step 48 of the through-hole 47 corresponds approximately to the sum of the height of the spring pot 24 up to and including the third section 26 c and the axial depth of the projection 50 of the ejection means 42 with easy play. The inner diameter of the front step 48 is so much smaller than the inner diameter of the two-th stage of the cylinder bore 2 that the portion 26 d of the locking arm 26 in the ejection of the spring cup 24 from the tool 40 substantially without material contact with the second stage the inner groove 27 engages.

The assembly of the spring cup 24 in the intended A position can be summarized as follows. From the throwing means 42 is inserted into the outer part 41 until it stops. The spring cup 24 is then introduced into the recess 48 with the pot bottom 25 first. The wire spring 23 is then centered in the spring cup 24 . Finally, the spindle 11 with the plate or disc 22 attached is inserted through the wire spring 23 and spring cup 24 into the front step of the through bore 51 of the ejection means 42 .

The assembly unit formed by the tool 40 and the parts mentioned above to be assembled and to be assembled is now inserted into the cylinder bore 2 to a position as shown in FIG. 3. For Einra most of the spring cup 24 in the inner groove 27 , the ejection means 42 is axially inward against the blocked at the stop outer part 41 . It presses against the bias voltage of the wire spring 23 on the pot bottom 25 and the Fe dertopf 24 is free, so that it can snap into the inner groove 27 . When the spring cup 24 is released, the sections 26 d swing out of the latching arms 26 to the outside and at the same time to the front in the direction of the inner groove 27 . During the Verra least the locking arms 26 , the ejection means 42 is held in its axially advanced position and the outer part 41, in contrast, axially pulled out (ie to the left in Fig. 4) to finally release the spring cup 24 . Finally, the tool 40 is pulled out of the brake housing 1 , the spring cup 24 remaining in the parts fi xed by him in the installed state.

It should be noted that the tool 40 can also be used to dismantle the spring cup 24 and the parts fixed by it. For this purpose, the outer part 41 is possibly inserted into the cylinder bore up to the stop with a set ejection means 42 . By compressing the latching arms 26, the spring cup 24 disengages and comes free, which jumps into the tool 40 due to the prestressing of the compression spring 23 . Due to the elastic locking arms 26 the Fe dertopf 24 is then frictionally held in the tool 40 and can be pulled out of the cylinder bore 2 with this. When inserted ejection means 42 of the spring cup 42 can be released from the tool 40 in a simple manner.

Reference list

1

Brake housing

2nd

Cylinder bore or inner bore

3rd

Brake cylinder

4th

Brake piston

5

elastic sealing ring

6

Folding cuff

7

inner space

8th

mechanical actuator

9

Actuating shaft

10th

Pressure piece

11

spindle

12th

mother

13

Coupling element

14

conical friction surface

15

Friction surface

16

thread

17th

Roller bearings

18th

eccentric recess

19th

Sealing ring

20th

Guide section

21

Pilot hole

22

Plate

23

Wire spring

24th

Spring pot

25th

Pot bottom

26

Locking arm

26

ad sections

27

Inner groove

28

Wire spring

29

attack

30th

movable disc ring

31

ball-bearing

32

storage area

40

Tool

41

Outer part

42

Expectorant

43

Handle section

44

Insertion section

45

front end

46

Circulation groove

47

stepped through hole

48

inner or front section

49

outer or rear section

50

head Start

51

stepped through hole

52

Stop tab

Claims (13)

1. A method for the assembly of a locking means ( 26 ) aufwei send spring cup ( 24 ) in an inner bore ( 2 ), in particular a brake cylinder ( 3 ) of a disc brake with adjusting device, characterized in that for the assembly:

• a) the spring cup ( 24 ) is received in a tool ( 40 ) which prestresses the latching means ( 26 ),
• b) the tool ( 40 ) together with the received spring cup ( 24 ) is inserted into the inner bore ( 2 ), and
• c) the spring cup ( 24 ) inside the inner bore ( 2 ) is moved out of the tool ( 40 ) in such a way that the pretensioning of the latching means ( 26 ) is released.

2. Assembly method according to claim 1, characterized in that in step c) the spring cup ( 24 ) with the help of egg nes against the bottom ( 25 ) of the spring cup ( 24 ) press the ejection means ( 42 ) from the tool ( 40 ) is moved . 3. Assembly method according to claim 2, characterized in that in step c) the spring cup ( 24 ) with the help of the ejection means ( 42 ) is moved as far out of the tool ( 40 ) that the locking means ( 26 ) arranged in a corresponding ver Counter locking means ( 27 ) snaps into the inner bore ( 2 ). 4. Assembly method according to claim 3, characterized in that in step a) a spindle ( 11 ) in a recess ( 51 ) of the ejection means ( 42 ) is received, and that in step c) the spindle ( 11 ) by the movement tion of the ejection means ( 42 ) is brought into an intended installation position. 5. A method for dismantling a locking means ( 26 ) on pointing spring cup ( 24 ), which is mounted in an inner bore ( 2 ), in particular a brake cylinder ( 3 ) of a disc brake with adjusting device, characterized in that for the dismantling:

• a) the spring cup ( 24 ) is received within the inner bore ( 2 ) in such a way in a tool ( 40 ) that the locking means ( 26 ) is biased, and
• b) the tool ( 40 ) together with the received spring cup ( 24 ) is pulled out of the inner bore ( 2 ).

6. Disassembly method according to claim 5, characterized in that in a step c) the spring cup ( 24 ) with the help of a against the bottom ( 25 ) of the spring cup ( 24 ) pushing ejection means ( 42 ) from the tool ( 40 ) is moved. 7. Tool ( 40 ) for the assembly and / or disassembly of a locking means ( 26 ) having spring cup ( 24 ) in an inner bore ( 2 ), in particular a brake cylinder ( 3 ) of a disc brake with adjusting device, and in particular for performing a method according to of the preceding claims, characterized in that the tool ( 40 ) has a recess ( 47 ; 48 ) for receiving the spring cup ( 24 ) which is formed in such a way that it engages the latching means ( 26 ) when the spring cup ( 24 ) is received. preloaded. 8. Tool ( 40 ) according to claim 6, characterized in that it has an ejection means ( 42 ) for ejecting the spring cup ( 24 ). 9. Tool ( 40 ) according to claim 7 or 8, characterized in that the recess ( 47 ; 48 ) is formed continuously. 10. Tool ( 40 ) according to claim 9, characterized in that the ejection means ( 42 ) in an outer section ( 49 ) and the spring cup ( 24 ) in an inner section ( 48 ) of the recess ( 47 ; 48 ) is received. 11. Tool ( 40 ) according to claim 9 or 10, characterized in that a step-like stop for one-sided mounting of the ejection means ( 42 ) is formed in the recess ( 47 ). 12. Tool ( 40 ) according to one of claims 7 to 11, characterized in that the diameter of the inner portion ( 48 ) of the recess ( 47 ; 48 ) on the diameter of a substantially conical shell portion ( 26 c) of the spring cup ( 24 ) is adjusted. 13. Tool ( 40 ) according to one of claims 7 to 12, characterized in that it is designed for a centered on in the inner bore ( 2 ), in particular cylin drisch.