WO2006100215A1

WO2006100215A1 - Device for monitoring the position and movement of a brake pedal and corresponding assembly method

Info

Publication number: WO2006100215A1
Application number: PCT/EP2006/060860
Authority: WO
Inventors: Heinrich Kreh
Original assignee: Continental Teves Ag & Co. Ohg
Priority date: 2005-03-24
Filing date: 2006-03-20
Publication date: 2006-09-28
Also published as: DE102005014414A1

Abstract

The invention relates to a device for monitoring the position and movement of a brake pedal. Said device comprises a master cylinder (1) having an integrated position sensor for monitoring the location and position of a displaceable piston (2, 3) within a housing (6) for use in a controlled automotive brake system, especially a system for regulating driving dynamics. The position sensor comprises a magnet (48) as the signal transmitter, said magnet emitting a magnetic field in the direction of the sensor element (49) and being arranged between two pistons (2, 3) by means of spring elements and being displaceable in relation to at least one of the pistons (2, 3). In order to facilitate assembly of the device, the magnet (48) is magnetically connected to a component (57; 68; 72) either indirectly or directly, said component allowing the magnet (48) to be displaced in relation to its support (56).

Description

Device for monitoring the position and movement of a brake pedal and assembly method therefor

The invention relates to a device for monitoring the position and movement of a brake pedal comprising a master cylinder with integrated position sensor for monitoring the position and position of a displaceable piston within a housing for use within a controlled braking system for motor vehicles, in particular with vehicle dynamics control, wherein the position transmitter a magnet having as a signal generator, which emits a magnetic field in the direction of a sensor element and which is arranged by means of spring means between two pistons, and is provided relative to at least one of the pistons displaceable.

Such a device is known for example from DE 10 2004 014 808 Al, wherein the magnet and two pole discs are arranged by mechanical means on a sleeve which is formed of a non-magnetic material. A disadvantage is the complex installation of the magnet and the pole discs is considered.

Therefore, it is an object of the present invention to provide a device for monitoring the position and movement of a brake pedal with a lower assembly cost and to provide a method of assembly for this purpose. This object is achieved in that the magnet is directly or indirectly magnetically connected to a component which is provided for allowing a displacement of the magnet in relation to its carrier, whereby the mounting of the magnet and the pole discs on the carrier is simplified. In this case, means for bundling the magnetic field are preferably provided and the magnet is magnetically connected to the component by means of one of the means.

Preferably, the spring means are assembled by means of a cage elastically biased and comprise a return spring and a compression spring, wherein the cage has a sleeve and the carrier for biasing the return spring and the component and the second sleeve for biasing the compression spring are provided, wherein the magnet on the second sleeve is arranged guided. The cage can thus be provided as a preassembled module.

According to an advantageous embodiment of the invention, the component is designed sleeve-shaped and has a radially outwardly directed, circumferential collar and the means for bundling the magnetic field comprise a first and a second pole disc, wherein the first pole disc between the peripheral collar of the component and the compression spring is provided arranged and the magnet is magnetically attached to the first pole disc. The component is thus easy to manufacture and the first pole piece can be included in the pre-assembled cage assembly. The mounting of the magnet on the carrier takes place in a simple manner in that the magnetic force holds the magnet to the first pole disc. For guiding on the carrier, the first pole disc preferably has circular segment-shaped recesses, wherein webs are provided between the circular segment-shaped recesses, which are guided in axial recesses of the carrier.

According to an advantageous embodiment of the invention, the radially outwardly directed, circumferential collar is provided at one end of the component, whereby a particularly easy to manufacture embodiment of the component is achieved.

To improve the guidance of the component in the carrier, another advantageous development of the invention provides that the component has a first cylindrical portion and a second cylindrical portion and that the radially outwardly directed, circumferential collar is provided between the cylindrical portions, wherein the circumferential collar is preferably produced by forming the component. As a result, tilting of the carrier is excluded.

According to a further advantageous embodiment, the component is designed sleeve-shaped and has at one end a radially outwardly directed, circumferential collar, in which circular segment-shaped recesses are provided, wherein formed between the recesses webs are guided in axial recesses of the carrier. Preferably, the circumferential collar is provided as a means for concentrating the magnetic field and the magnet is magnetically connected to the collar, whereby a reduction of the components of the cage assembly is achieved. The magnet is mounted on the carrier and connected to the component - A -

in a simple manner in that the magnetic force holds the magnet to the rotating collar.

To achieve the object, a method for mounting a device for monitoring the position and movement of a brake pedal is proposed according to the invention, which provides that the spring means comprise a return spring and a compression spring and are biased by a cage, wherein the return spring between a sleeve and the carrier is biased, which are connected by means of a push rod, and that the compression spring is biased directly or indirectly between a component and the carrier, that a radially inwardly directed, circumferential collar of the component between a stop of the push rod and the carrier is arranged and that Magnet arranged on the carrier and indirectly or directly magnetically connected to the component.

According to an advantageous embodiment of the method according to the invention, a first pole disc between a radially outwardly directed, circumferential collar of the component and the compression spring is arranged, the magnet is magnetically attached to the first pole disc and a second pole plate is magnetically attached to the magnet.

Another advantageous embodiment of the method according to the invention provides that the magnet is magnetically connected to a radially outwardly directed, circumferential collar of the component and a pole disc is magnetically attached to the magnet

The invention will be explained with reference to the drawing which shows embodiments. It shows in each case strongly schematized as well as in longitudinal section: Figure 1 is a master cylinder of a known device for monitoring the position and movement of a brake pedal;

FIG. 2 shows a preassembled cage assembly of a first embodiment of a device according to the invention for monitoring the position and movement of a brake pedal;

FIG. 3 shows a carrier of the assembly according to FIG. 2;

FIG. 4 shows a first pole disk of the assembly according to FIG. 3;

Figure 5 shows a preassembled cage assembly of a second embodiment of a device according to the invention for monitoring the position and movement of a brake pedal and

6 shows a preassembled cage assembly of a third embodiment of a device according to the invention for monitoring the position and movement of a brake pedal.

In addition to wheel brakes, a vehicle brake system comprises a hydraulic unit connected to it by means of pipe and hose lines with normally open or closed valves (inlet, exhaust, separating and reversing valves, the latter serving to change a suction pump in order to generate pressure in at least one wheel brake). and an integrated recirculation or booster pump and a shown in Fig. 1, pedal-operated master cylinder 1 of a known device for monitoring the position and movement of a brake pedal, with a first and a second piston 2,3 for first and second pressure chambers 4,5, wherein the pistons 2,3 for pressure medium supply of paired in brake circuits combined wheel brakes are arranged displaceably within a housing 6. It is understood that the master cylinder 1 may be preceded by a brake booster for generating a servo force, even if this task in principle by another pressure booster source - such as the pump - can be met.

The master cylinder 1 of Fig. 1 is designed as a so-called central valve tandem master cylinder, therefore, a central valve 7,8 is provided per piston 2.3. The respective central valve 7, 8 interacts to seal the associated pressure chambers 4, 5 with the respective piston 2, 3 taking into account a predetermined closing path. From an unillustrated expansion tank open via connections 9,10 follower channels 11,12 each in after-run rooms 13,14, which are sealed by means of primary sealing sleeves 15,16 relative to the associated pressure chambers 4,5. Further, the follow-up space 14 is sealed by means of a secondary sealing sleeve 17 with respect to the first pressure chamber 4, wherein the secondary sealing sleeve 17 is arranged in a circumferential groove 18 of the second piston 3.

A, arranged in a recess 19 of the housing 6 seal assembly 20 seals the Nachlaufräum 13 from the atmosphere. The sealing arrangement 20 is delimited on the side facing the first pressure chamber 4 by a disk 21, wherein a securing element 22 secures the sealing arrangement 20 and the disk 21 in the recess 19.

The seal assembly 20 has a guide ring 23, which consists of a plastic and a low-wear guide of the first piston 2 is used, as well as one, on the guide ring 23 in the direction of the first pressure chamber 4 arranged secondary sealing sleeve 24.

The central valves 7, 8 are kept open in an unactuated state by stops 25, 26 formed as cylindrical pins, the stops 25, 26 extending through slot-shaped recesses 27, 28 of the pistons 2, 3. The stop 25 is arranged in a longitudinal bore 29 of the housing 6, wherein it abuts against the disc 21. In contrast, the stop 26 is fixed in a housing bore 30 of the housing 6 and the slot-shaped recess 28 of the second piston 3 is disposed in a region between the primary sealing sleeve 16 and the secondary sealing sleeve 17.

Each of the pistons 2, 3 is assigned a restoring spring 31, 32, which is supported by a first end 33, 34 on a first sleeve 35, 36 and by a second end 37, 38 on a second sleeve 39 or on a housing bottom 40 , The first sleeve 35, 36 of the restoring spring 31, 32 is supported on a first piston section 41, 42 of the first and second pistons 2, 3. When piston displacement in an operating direction A, the return spring 31,32 is compressed and expanded for the purpose of piston return.

The operation of the central valve tandem master cylinder 1 is basically known. Upon actuation of a brake pedal, not shown, the first piston 2 is moved in the direction of actuation A to the left. By this linear movement of the first piston 2, the associated central valve 7 closes, so that the corresponding pressure chamber 4 with respect to its connection 9 via the overflow channel 11 and the trail clearance 13 is completed to the expansion tank, not shown. As a result of the resulting hydrostatic pressure in the pressure chamber 4, the second piston 3 is moved synchronously with the first piston 2 in the direction of actuation A and closes in the associated brake circuit its central valve 8. Now builds in the same way in this brake circuit hydraulic pressure because of local pressure chamber 5 is closed with respect to its connection 10 via the overflow channel 12 and the overflow chamber 14 to the expansion tank. Consequently prevails in both pressure chambers 4.5 practically the same hydraulic pressure, which is transmitted to wheel brakes, not shown.

The return spring 31 of the first piston 2 is held in a cage 43, which has the first sleeve 35, the second sleeve 39, a push rod 44 and a third sleeve 52 as constituents. The two sleeves 35,39 and the push rod 44 are limited by means of the push rod 44 formed stops 45,46 telescopically and cause in the unactuated state, a resilient bias of the return spring 31st

The second piston 3 has a second, peg-shaped piston portion 47, on which the second sleeve 39 abuts. The magnet 48 is arranged guided on the second sleeve 39.

The permanent magnet 48, which in turn serves as a signal transmitter for a position transmitter and a magnetic field radially in the direction of a sensor element 49 shown only schematically - in the form of a Hall sensor, a magnetoresistive sensor or a reed contact - emits the stationary on the housing. 6 is provided, and with a non-subscribed electronic Control unit is connectable to allow a position detection. It should be noted that a Hall sensor or a magnetoresistive sensor as an active component also requires a power supply, while a reed contact as a controlled switch only acts as an opener or closer of a circuit. The sensor element 49 may also have local intelligence in the form of a so-called ASIC (Application Specific Integrated Circuit) for better networking within a bus system.

The magnet 48 is annular and as can be seen between a first and a second pole disc 50,51 of magnetic material disposed on the third cylindrical sleeve 52 of non-magnetic material, which via a radially outwardly directed collar 53 with not shown, outwardly directed projections axial abutment of the second pole plate 51 has.

By this ring shape of the magnet 48, it is possible to dispose and fix the sensor element 49 not only in a position as shown in FIG. 6, but theoretically at an arbitrary position along the circumference of the housing 6.

As already stated, the cage 43 comprises the first and the second sleeve 35, 39, the restoring spring 31 prestressed therein, the push rod 44, the third sleeve 52 and the first pole disk 50, and a compression spring 54 whose spring force is smaller than that of the return spring 31 ,

Since the return spring 31 rests with its end 37 on the second sleeve 39, the third sleeve 52 by the bias of the second sleeve 39 by means of the return spring 31 held in the direction of actuation A in their abutment against the stop 46.

The compression spring 54, which is arranged in the radial direction between the second sleeve 39 and the third sleeve 52, abuts with a first end on an inner side 55 of the second sleeve 39 and with a second end on the first pole plate 50, whereby the third sleeve 52, the magnet 48 and the pole disks 50,51 are held biased in the position shown.

If the second piston 3 is fixed immovably due to a vehicle dynamics control, allows for an actuation-related compression of the return spring 31, the displacement of the push rod 31 in the direction of actuation A expansion of the compression spring 54. The third sleeve 52 is connected to the magnet 48 and the two pole plates 50, 51 thereby shifted in the direction of actuation A in the region of the sensor element 49.

To mount the magnet 48 and the second pole disk 51, it is necessary that the cage 43 is compressed, so that the collar 53 of the third sleeve 52 emerges from an interior of the second sleeve 39. Only then can the magnet 48 and the second pole disk 51 be mounted on the third sleeve 52. For this purpose, the second pole plate 52 is configured substantially annular with not shown, inwardly directed projections, which are provided for bearing against the projections of the third sleeve 52. In order to achieve this attachment of the projections, the second pole plate 52 must be rotated during assembly to the third sleeve 52.

FIGS. 2 to 6 show three different ones Embodiments of a device according to the invention for monitoring the position and movement of a brake pedal. The basic structure and function of such a device has been described in accordance with FIG. 1, so that only the features essential to the invention will be discussed below. Identical or matching components are indicated in FIGS. 2 to 6 by the reference numerals of FIG. 1 and will not be explained further.

Fig. 2 shows a cage 43 as a preassembled module of a first embodiment. As can be seen, the cage 43 comprises the first sleeve 35 and a carrier 56, the restoring spring 31 prestressed therein, the push rod 44, a component 57 and the compression spring 54.

The component 57 is sleeve-shaped and made of a magnetic material and has at one, the push rod 44 facing away from the end 58 a radially outwardly directed, circumferential collar 59, which serves the system of a first pole plate 60 of the magnet 48. At its other end 77, the component 57 has a radially inwardly directed collar 78, which is held between the stop 46 and the inside 55 of the carrier 56 by the biasing force of the compression spring 54.

As is apparent from Fig. 2, the collar 59 extends in the radial direction no further than just before an inner side 74 of the carrier 56 and the first pole plate 60 is disposed between the collar 59 of the member 57 and the compression spring 54 and is biased by the bias the compression spring 54 is held in the position shown.

The annular magnet 48 is pushed during assembly on a first cylindrical portion 62 of the carrier 56, on which it is provided guided, and is held magnetically, ie only by its magnetic force on the first pole disc 60, whereby the magnet 48 is indirectly connected by the first pole disc 60 magnetically connected to the component 57. After the magnet 48 has been mounted, a second pole disk 61 is pushed onto the first cylindrical section 62, which in turn is held on the magnet 48 by the magnetic force.

If the second piston 3 is fixed immovably due to a vehicle dynamics control, allows for an actuation-related compression of the return spring 31, the displacement of the push rod 31 in the direction of actuation A expansion of the compression spring 54. The component 57 is connected to the magnet 48 and the two pole plates 50,51 characterized shifted in the direction of actuation A relative to the carrier 56 in the region of the sensor element 49, since the carrier 56 rests against the second piston portion 47 of the second piston 3.

From Fig. 3, which shows the carrier 56 in a three-dimensional view, it can be seen that the carrier 56 has a second cylindrical portion 63 and a disposed between the sections 62,63 circumferential collar 64, on which the end 37 of the return spring 31 abuts , The first cylindrical portion 62 is provided with slit-shaped, axial recesses 65, which serves for guiding and preventing rotation of the first pole disc 60 and thus also the magnet 48 adhering thereto by the magnetic force. For this purpose, the first pole disk 60, which is shown spatially in FIG. 4, has circular segment-shaped recesses 66 and webs 67 located therebetween. The second pole disk 61 is designed annular. Fig. 5 shows a cage 43 as a preassembled module of a second embodiment, which differs from the first embodiment only in the configuration of the component. As is clear from Fig. 5, the cage 43 of the second embodiment, a sleeve-shaped member 68 having a first cylindrical portion 69, a second cylindrical portion 70 and an intermediate, radially outwardly directed, circumferential collar 71 which, for example, by forming of the component 68 can be produced. As a result of this embodiment, the guidance of the component 68 in the carrier 56 is improved, and tilting of the component 68 upon relative movement of the component 68 to the carrier 56 is precluded. As was also the case with the first embodiment according to FIG. 2, in this embodiment the magnet 48 is indirectly connected to the component 68 by the first pole disk 60 by means of its magnetic force.

6 shows a cage 43 as a preassembled subassembly of a third embodiment, which differs from the first embodiment in that a sleeve-shaped component 72 of the cage 43 has a radially outwardly directed collar 73 at an end 76 facing away from the push rod 44, which collar extends into radial direction over the inside 74 of the carrier 56 extends. For this purpose, the collar 73 has circular segment-shaped recesses 75, through which the circular segment-shaped cylindrical sections of the first cylindrical section 62 extend.

Since the component 72 is made of a magnetic material, the collar 73 may be the first pole disk 60 of the above embodiments according to FIGS. 2 and 5 replace. The magnet 48 is attached directly to the collar 73 during assembly by its magnetic force.

In the context of the invention, it is also conceivable that the master cylinder 1 is designed in plunger design.

LIST OF REFERENCE NUMBERS

1 master cylinder

2 pistons

3 pistons

4 pressure chamber

5 pressure chamber

6 housing

7 central valve

8 central valve

9 connection

10 connection

11 after-run channel

12 follower channel

13 follow-up room

14 follow-up room

15 primary gasket

16 Primary gasket

17 secondary sealing collar

18 groove

19 recess

20 sealing arrangement

21 disc

22 fuse element

23 guide ring

24 secondary sealing collar

25 stop

26 stop

27 recess

28 recess

29 longitudinal bore

30 housing bore

31 return spring

32 return spring End End Sleeve Sleeve End End Sleeve Caseback Piston section Piston section Cage Push rod Stop Stop Piston section Magnet Sensor element Pole washer Pole washer Sleeve Friction Compression spring Inner side Carrier Component End Fretish Pole Pole disk Section Section Fret Recess Recess 67 footbridge

68 component

69 section

70 section

71 fret

72 component

73 fret

74 inside

75 recess 76 end

77 end 78 fret

A actuating direction

Claims

claims

Device for monitoring the position and movement of a brake pedal, comprising a master cylinder (1) with integrated position transmitter for monitoring the position and position of a displaceable piston (2, 3) within a housing (6) for use within a controlled braking system for motor vehicles, in particular with driving dynamics control, the position transmitter having a magnet (48) as a signal transmitter which emits a magnetic field in the direction of a sensor element (49) and which is arranged by spring means between two pistons (2, 3) and relative to at least one of the pistons (2 3), characterized in that the magnet (48) is directly or indirectly magnetically connected to a component (57; 68; 72) which is adapted to allow displacement of the magnet (48) in relation to its support (56 ) is provided.

2. Device according to claim 1, characterized in that means for bundling the magnetic field are provided and that the magnet (48) by means of one of the means is magnetically connected to the component (57; 68; 72).

3. A device according to claim 2, characterized in that the spring means of a cage (43) are elastically biased together and comprise a return spring (31) and a compression spring (54), wherein the cage (43) has a sleeve (35) and the Carrier (56) for biasing the return spring (31) and the component (57; 68; 72) and the carrier (56) for biasing the compression spring (54) are provided.

4. Apparatus according to claim 3, characterized in that in that the component (57; 68) is sleeve-shaped and has a radially outwardly directed, circumferential collar (59; 71) and in that the means for bundling the magnetic field comprise a first pole disk (60) and a second pole disk (61) the first pole disc (60) is provided between the circumferential collar (59; 71) of the component (57; 68) and the compression spring (54) and the magnet (48) is magnetically fixed to the first pole disc (60).

5. The device according to claim 4, characterized in that the first pole disc (60) circular segment-shaped recesses (66), wherein between the circular segment-shaped recesses (66) webs (67) are provided, which in axial recesses (65) of the carrier (56 ) are guided.

6. Apparatus according to claim 5, characterized in that the radially outwardly directed, circumferential collar (59) at one end (58) of the component (57) is provided.

7. The device according to claim 5, characterized in that the component (68) has a first cylindrical portion (69) and a second cylindrical portion (70) and that the radially outwardly directed, circumferential collar (71) between the cylindrical portions ( 69,70) is provided.

8. The device according to claim 7, characterized in that the circumferential collar (71) by forming the component (68) can be produced.

9. Apparatus according to claim 3, characterized in that the component (72) is designed sleeve-shaped and to an end (76) has a radially outwardly directed, circumferential collar (73) in which circular segment-shaped recesses (75) are provided, wherein formed between the recesses (75) webs in axial recesses (65) of the carrier (56) are guided ,

10. The device according to claim 9, characterized in that the circumferential collar (73) is provided as a means for bundling the magnetic field and the magnet (48) is magnetically connected to the collar (73).

11. A method for mounting a device for monitoring the position and movement of a brake pedal, in particular using a device according to claim 1, characterized in that

- The spring means comprise a return spring (31) and a compression spring (54) and are biased by a cage (43), wherein the return spring (31) between a sleeve (35) and the carrier (56) is biased, which by means of a push rod (44) are connected, and the compression spring (54) is biased directly or indirectly between a component (57; 68; 72) and the support (56),

- A radially inwardly directed, circumferential collar (78) of the component (57, 68, 72) between a stop (46) of the push rod (44) and the support (56) is arranged and

- The magnet (48) arranged on the support (56) guided and indirectly or directly magnetically connected to the component (57; 68; 72) is connected.

12. A method for mounting a device for monitoring the position and movement of a brake pedal according to claim 11, characterized in that a first pole disc (60) between a radially outwardly directed circumferential collar (59; 71) of the component (57; 68) and the compression spring (54) is arranged such that the magnet (48) is magnetically fixed to the first pole disc (60) and a second pole disc (61) is magnetically attached to the magnet (48).

13. A method for mounting a device for monitoring the position and movement of a brake pedal according to claim 11, characterized in that the magnet (48) is magnetically connected to a radially outwardly directed, circumferential collar (73) of the component (72) and a Polscheibe magnetically attached to the magnet (48).