MULTIPLE DISK BRAKE FOR A ROTATABLE ELEMENT

Abstract

An interconnected multiple disk brake for a rotatable element with an integrated sensor which is based on the rotation of a sensor disk.

Claims

1. A multiple disk brake for a rotatable element, comprising: a stator; a number of primary disks, which are connected to the rotatable element for conjoint rotation and are rotatable relative to the stator; a number of intermediate disks, which are each mounted on the stator between the primary disks fixedly or rotatably to a limited extent; an application element, which is configured to press the primary disks against the intermediate disks in order to apply the multiple disk brake;, a restoring unit, which is configured to prestress at least one sensor disk of the intermediate disks mounted rotatably to a limited extent in respect of its rotary movement into an idle position relative to the stator; and a sensor, which is designed to detect a rotation of the sensor disk from its idle position.

2. The multiple disk brake as claimed in claim 1, wherein the restoring unit is a spring element.

3. The multiple disk brake as claimed in claim 1, wherein the restoring unit is fixedly connected to the sensor disk, or wherein the restoring unit is fixedly connected to the stator.

4. The multiple disk brake as claimed in claim 1, wherein the sensor disk is connected to the sensor by a pointer, wherein the pointer protrudes from the sensor disk.

5. The multiple disk brake as claimed in claim 4, wherein the pointer is connected to the sensor disk fixedly or so as to be displaceable in a radial direction.

6. The multiple disk brake as claimed in claim 4, wherein the pointer is designed to be thermally insulating.

7. The multiple disk brake as claimed in claim 4, wherein the sensor has a radially dimensionally stable, tangentially elastic element, in which the pointer engages.

8. The multiple disk brake as claimed in claim 7, wherein the elastic element is a corrugated bellows.

9. The multiple disk brake as claimed in claim 4, wherein the sensor has a merely tangentially displaceably mounted element, in which the pointer engages.

10. The multiple disk brake as claimed in claim 9, wherein the tangentially displaceably mounted element is connected to the stator by an elastic sealing means.

11. The multiple disk brake as claimed in claim 7, wherein the pointer is axially displaceable or has axial play in the tangentially elastic element or in the tangentially displaceably mounted element.

12. The multiple disk brake as claimed in claim 1, wherein the restoring unit is fixedly connected to the stator and is designed as part of the sensor.

13. The multiple disk brake as claimed in claim 7, wherein the sensor has a magnet detector arrangement in order to detect a deformation of the tangentially elastic element or a displacement of the tangentially displaceably mounted element or a deformation of the restoring unit.

14. The multiple disk brake as claimed in claim 13, wherein the magnet detector arrangement is or has a detection device based on an anisotropic magnetoresistive (AMR) effect.

15. The multiple disk brake as claimed in claim 1, which has a shaft as the rotatable element.

16. The multiple disk brake as claimed in claim 1, wherein the multiple disk brake is provided interconnected with an electronic vehicle system comprising at least one electronic control unit, since an electronic integration with at least one electronic connection between the multiple disk brake and ECU is present, so that an electronic vehicle drivetrain control and an electronic brake system control inclusive of recuperation is made possible with the aid of the superordinate electronic control unit.

17. The multiple disk brake as claimed in claim 1, wherein the multiple disk brake is assigned at least one electronic sensor interface for electronic integration, for the purpose of interconnection with an electronic vehicle system.

18. The multiple disk brake as claimed in claim 5, wherein the pointer is designed to be thermally insulating.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Further features and advantages will be found by a person skilled in the art from the exemplary embodiments described below with reference to the appended drawing. In the drawing:

[0031] FIG. 1: shows a detail of a multiple disk brake,

[0032] FIG. 2: shows a further detail of a multiple disk brake,

[0033] FIG. 3: shows a detailed view.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0034] FIG. 1 shows a detail of a multiple disk brake LB according to an exemplary embodiment of the invention.

[0035] In this case an intermediate disk 1 is shown, which is formed in the present case as a sensor disk. The intermediate disk 1 is mounted so as to be rotatable to a limited extent relative to a basic structure 9, which represents a housing of the disk brake LB.

[0036] The disk brake LB has a rotatable element 10 in the form of a shaft. The rotatable element 10 is connected for conjoint rotation to primary disks, not shown. A braking effect on the rotatable element 10 can thus be achieved by pressing the primary disks against the sensor disk 1 or other intermediate disks.

[0037] The multiple disk brake LB has a number of rods 6, which are fixedly connected to the basic structure 9. It also has spring elements 7, which are fixedly connected to the sensor disk 1 and which, as shown, bear against a particular rod 6. The intermediate disk 1 is thus mounted so as to be rotatable to a limited extent relative to the basic structure 9, wherein the spring elements 7 ensure a restoring force into an idle position. They thus serve as a restoring unit.

[0038] A projection 8 is arranged on the outer circumference of the intermediate disk 1, on which projection there is mounted a pointer 2. This pointer 2 can also be referred to as a finger. As shown, it is radially displaceable on the projection 8. Temperature peaks and corresponding radial expansions can thus be decoupled. In an alternative embodiment, the pointer 2 could also be integrated in one part into the intermediate disk 1. The pointer 2 transmits a tangential movement of the intermediate disk 1 to a sensor S of the multiple disk brake LB, which will be described in greater detail hereinafter.

[0039] The pointer 2 can also be formed as an insulation element.

[0040] The sensor S has a corrugated bellows 3, which in the present case is designed as a radially dimensionally stable, tangentially elastic element. The pointer 2 engages in this corrugated bellows 3 and thus transmits a tangential movement from the sensor disk 1 to the corrugated bellows 3. A magnet M is disposed on the corrugated bellows 3, which is dimensionally stable in the radial direction, and thus moves with the corrugated bellows 3 as the pointer 2 moves.

[0041] The sensor S also has a magnet detector arrangement 5, which is based on the anisotropic magnetoresistive effect. The magnet detector arrangement 5 is arranged here in the present case in a cover 4 of the sensor S, on an inner side. An at least largely equal air gap between magnet detector arrangement 5 and magnet M is typically obtained here. A displacement of the magnet M, which is based on a rotation of the sensor disk 1 from its idle position, can thus be identified and measured by means of the magnet detector arrangement 5.

[0042] In this way, a relative movement when a torque is applied to the intermediate disk 1 can be detected in the sensor S. This allows a conclusion to be drawn regarding the effective braking force.

[0043] FIG. 2 shows a detail of a multiple disk brake LB according to a second exemplary embodiment. In this case, the sensor S is embodied in an alternative way.

[0044] The magnet M is disposed here on a slide 12, which is mounted in the cover 4 so as to be displaceable only linearly, specifically tangentially. This corresponds to a drawer runner. For sealing, a flexible elastomer element is provided as a sealing means 11 between the slide 12 and housing 9. However, in this case, it does not satisfy any positioning requirements for the uniform axial spacing of the magnetic elements. Rather, an indicated air gap LS is ensured here by a guidance of the slide 12 in the cover 4, as shown.

[0045] FIG. 3 shows an enlarged detail of a possible embodiment of part of the sensor S. This can be used, for example, in the embodiment according to FIG. 2.

[0046] The slide 12, which can also be referred to as a sliding block, has a bore 13, through which a rod-shaped part of the cover 4 passes. A linear guidance is thus ensured.

[0047] A clearance 14 is provided between the slide 12 and the pointer 2, whereby in particular an axial displacement of the intermediate disk 1 can be taken into consideration. Reliability and service life are thus further increased.

[0048] A deliberate resilience in the tangential direction of the intermediate disk 1 can be realized alternatively, for example, also via separate spring elements, for example combined with a disk or pin component.

[0049] It should be mentioned that a spring element can be shaped arbitrarily in principle and can be mounted on the intermediate disk 1, as shown, or alternatively also on another element, such as on one of the rods 6 or on the basic structure 9, for example. The pointer 2 can advantageously be formed from a thermally insulating material. As a result, a thermal decoupling can be achieved. The intermediate disk 1 can also be formed from different materials.

[0050] Alternatively, the corrugated bellows 3 can also have other resilient, encapsulating contours. Alternatively to the magnet detector arrangement 5, which is based on the anisotropic magnetoresistive effect, other position sensors can also be used.

[0051] The intermediate disk 1, which is formed as a sensor disk, can be installed in a disk stack of the multiple disk brake LB in any position. A plurality of such intermediate disks 1 can also be formed as corresponding sensor disks.

[0052] A uniform air gap LS of the sensor S can be achieved via a sliding element in a guide. In the event of wear, axial movements of the intermediate disks 1 can be compensated for by corresponding recesses in the slide 12, without this influencing the measurement. On the whole, an economical and precise sensor with a low spatial requirement is provided by the described embodiment. The sensor S can be encapsulated here, in particular as shown, which allows a particularly high reliability.

[0053] It is pointed out that features may be described in combination in the claims and in the description, for example to facilitate understanding, although these may also be used separately from each other. The person skilled in the art will gather that such features may also be combined with other features or feature combinations independently of each other.

[0054] Dependency references in the dependent claims may characterize preferred combinations of the respective features but do not exclude other feature combinations.

LIST OF REFERENCE SIGNS

[0055] LB: multiple disk brake [0056] M: magnet [0057] 1: sensor disk, intermediate disk [0058] 2: pointer [0059] 3: corrugated bellows [0060] 4: cover [0061] 5: magnet detector arrangement [0062] 6: rod [0063] 7: spring element [0064] 8: projection [0065] 9: stator/basic structure [0066] 10: rotatable element [0067] 11: sealing means [0068] 12: slide [0069] 13: bore [0070] 14: clearance