DE102018100604A1 - Sensor target carrier ring for a piston-cylinder arrangement - Google Patents

Abstract

The invention relates to a sensor target carrier ring (1) for a piston-cylinder arrangement (2), wherein the piston-cylinder arrangement (2) as a housing (3) formed hollow cylindrical cylinder (4) and one in the cylinder (4) along a sensor (7) for detecting a sensor target (8) arranged on the sensor target carrier ring (1) on the housing (3) and the sensor target carrier ring (1) on the piston (6) ) are arranged; wherein the sensor target carrier ring (1) comprises a holder (9) with the sensor target (8), wherein the holder (9) consists of plastic and the sensor target (8) is cast into the plastic; wherein the sensor target carrier ring (1) comprises a reinforcing ring (10) with at least one fastening element (11), wherein the reinforcing ring (10) is connected to the holder (9) via a plastic deformation of the at least one fastening element (11).

Description

The present invention relates to a sensor target carrier ring for a piston-cylinder assembly. The piston-cylinder arrangement is in particular part of a clutch actuator for a friction clutch. By a displacement of the piston of the piston-cylinder assembly, the friction clutch can be actuated (disengaged or engaged).

A piston-cylinder arrangement comprises in particular a hollow-cylindrical cylinder designed as a housing and a piston which can be moved in the cylinder along an axial direction. A sensor (eg a Hall sensor) for detecting a sensor target (eg a magnet) arranged on the sensor target carrier ring is arranged on the housing and the sensor target carrier ring on the piston. The sensor target carrier ring comprises a holder with the sensor target comprises.

From the EP 1 898 111 A2 a piston-cylinder arrangement is known.

Next is from the post-published DE 10 2016 124 269 A1 a piston-cylinder arrangement known, wherein the sensor target is received in a holder of the sensor target carrier ring via locking elements. In this case, a play between locking elements and sensor target can occur at least after a certain operating time, so that the measured values of the sensor can be falsified.

A high rigidity of the sensor target carrier ring is important to ensure a stable position of the sensor target relative to the sensor. For this it would be desirable, the sensor target carrier ring z. B. with a metallic reinforcing ring to reinforce. There are known solutions in which the reinforcing ring is cast in a plastic, so that the reinforcing ring is integrally connected to the sensor target. However, it may be problematic to arrange the already magnetized sensor target together with the metallic reinforcing ring in a common injection mold. However, magnetization of the sensor target after injection molding may have undesirable influence on the metal reinforcing ring. Subsequent insertion of the sensor target in the holder, z. B. via locking elements, possibly leads to the adverse game between locking elements and sensor target.

The sensor target is z. For example, a neodynium iron Bore, SmCo, AlNiCo or ferrite magnet. The sensor is z. B. a Hall sensor.

The object of the invention is to at least partially solve the problems described with reference to the prior art and in particular to provide a sensor target carrier ring in which the sensor target is received safely and without play and which itself has a high rigidity.

This object is achieved with a sensor target carrier ring according to the features of the independent claim. Further advantageous embodiments of the invention are specified in the dependent formulated claims. It should be noted that the features listed individually in the dependent claims can be combined in a technologically meaningful manner and define further embodiments of the invention. In addition, the features specified in the claims are specified and explained in more detail in the description, wherein further preferred embodiments of the invention are shown.

The invention relates to a sensor target carrier ring for a piston-cylinder arrangement. The piston-cylinder arrangement is in particular part of a clutch actuator for a friction clutch. The piston-cylinder arrangement has a hollow-cylindrical cylinder designed as a housing and a piston movable in the cylinder along an axial direction. A sensor for detecting a sensor target arranged on the sensor target carrier ring is arranged on the housing and the sensor target carrier ring on the piston. The sensor target carrier ring comprises a holder with the sensor target, wherein the holder is made of plastic and the sensor target is cast in the plastic. The sensor target carrier ring comprises a reinforcing ring with at least one fastening element, wherein the reinforcing ring is connected to the holder via a plastic deformation of the at least one fastening element.

The friction clutch is in particular a single-disc dry clutch or a double clutch. Such friction clutches are used to interrupt a torque flow from a drive motor to a drive train of a motor vehicle. The friction clutch can be engaged and / or disengaged by a clutch actuating device in order to activate and / or deactivate a torque flow from a drive motor to a drive train of the motor vehicle.

The clutch actuation device may in particular be a master cylinder connected to a clutch pedal, for example, or a slave cylinder. The slave cylinder can be connected directly to the friction clutch.

The piston-cylinder arrangement has a housing, wherein a piston is movably arranged in the housing. In the case of a master cylinder can be constructed by means of the piston, a pressure in a pressure chamber for a hydraulic fluid through which a piston of a slave cylinder is movable via a hydraulic line. In the case of a slave cylinder, the piston may act directly or indirectly on the friction clutch to actuate the friction clutch.

The piston is firmly connected to the sensor target via the sensor target carrier ring, so that the sensor target can be moved as permanently as possible unchanged with the piston in the housing along the axial direction.

The sensor target is in particular a magnet, which may be, for example, a neodynium-iron-boron magnet or an SmCo, AlNiCo or ferrite magnet. The magnet cooperates with the sensor so that a position or piston stroke of the piston in the housing of the piston-cylinder assembly can be detected.

The magnet generates a magnetic field that is detected by the sensor. A switching point of the sensor is formed by a limit value of the measured flux density of the magnetic field.

Such a sensor uses the so-called Hall effect for measuring magnetic fields. By a displacement of the magnet with the piston along the axial direction can be detected by the sensor correlating therewith a change of the magnetic field in the region of the sensor. This change causes a change in the Hall voltage. In this case, a change in the Hall voltage can be determined only above a predetermined minimum flux density of the magnetic field.

In particular, the holder is designed annular, with holder, piston and reinforcing ring are arranged coaxially with each other.

In particular, the holder and the reinforcing ring each extend annularly, wherein the sensor target is spaced in a radial direction and disposed outside of the reinforcing ring.

Preferably, the reinforcing ring comprises a metallic material or is made exclusively of a metallic material.

In particular, the holder has a receptacle for the at least one fastening element, wherein the receptacle for the at least one fastening element forms a stop with respect to a circumferential direction. A rotation of the holder relative to the reinforcing ring is thus no longer possible or at least limited, at least after the deformation of the at least one fastening element.

Preferably, the reinforcing ring comprises a plurality of fasteners spaced along a circumferential direction from each other. In particular, the holder comprises a plurality of receptacles, wherein each receptacle preferably cooperates with a respective fastening element.

1. a) Bereitstellen eines Halters mit einem Sensortarget, wobei der Halter aus Kunststoff besteht und das Sensortarget in den Kunststoff eingegossen ist;
2. b) Bereitstellen eines Verstärkungsrings;
3. c) Anordnen von Halter und Verstärkungsrings;
4. d) Plastisches Umformen mindestens eines Befestigungselements zur Verbindung von Halter und Verstärkungsring.

A method for producing the described sensor target carrier ring is further proposed, comprising at least the following steps:

1. a) providing a holder with a sensor target, wherein the holder is made of plastic and the sensor target is poured into the plastic;
2. b) providing a reinforcing ring;
3. c) arranging holder and reinforcing ring;
4. d) plastic forming at least one fastener for connecting the holder and reinforcing ring.

The plastic deformation comprises in particular a bending over of the at least one fastening element.

In particular, holder and reinforcing ring are connected to each other without play after step d).

It is further proposed a piston-cylinder arrangement, wherein the piston-cylinder arrangement comprises a housing formed as a hollow cylindrical cylinder, a piston movable in the cylinder along an axial direction and the previously described sensor target carrier ring, which is carried out as described and / or by the method described is produced, wherein a sensor for detecting a sensor target arranged on the sensor target carrier ring on the housing and the sensor target carrier ring are arranged on the piston.

It is further proposed a clutch actuator for a friction clutch, wherein the clutch actuator comprises the piston-cylinder arrangement already described and a release bearing, wherein a friction clutch via the release bearing is actuated.

The comments on the sensor target carrier ring apply equally to the piston-cylinder assembly, the clutch actuator and the method and vice versa.

By way of precaution, it should be noted that the numerical terms used here ("first", "second",...) Primarily (only) serve to distinguish a plurality of similar objects, variables or processes, ie in particular no dependence and / or order of these objects, quantities or mandate processes to one another. If a dependency and / or order are required, this is explicitly stated here or it obviously results for the person skilled in the art when studying the concretely described embodiment.

• 1: eine Kupplungsbetätigungseinrichtung in einer Seitenansicht mit einer Kolben-Zylinder-Anordnung in einer ersten Stellung;
• 2: die Kolben-Zylinder-Anordnung nach 1 in einer Seitenansicht in einer zweiten Stellung; und
• 3: einen Sensortargetträgerring in einer ersten perspektivischen Ansicht;
• 4: den Sensortargetträgerring nach 3 in einer zweiten perspektivischen Ansicht;
• 5: Halter und Verstärkungsring des Sensortargetträgerring nach 3 und in einer perspektivischen Ansicht;
• 6: den Sensortargetträgerring nach 5 in einer perspektivischen Ansicht gemäß Schritt c) des Verfahrens;
• 7: den Sensortargetträgerring nach 6 in einer perspektivischen Ansicht gemäß Schritt d) des Verfahrens;
• 8: den Sensortargetträgerring nach 3 bis 7 in einer perspektivischen Ansicht im Schnitt; und
• 9: den Sensortargetträgerring nach 8 in einer Seitenansicht im Schnitt.

The invention and the technical environment will be explained in more detail with reference to FIGS. It should be noted that the invention should not be limited by the embodiments shown. In particular, unless explicitly stated otherwise, it is also possible to extract partial aspects of the facts explained in the figures and to combine them with other components and findings from the present description and / or figures. In particular, it should be noted that the figures and in particular the illustrated proportions are only schematic. The same reference numerals designate the same objects, so that explanations of other figures can be used if necessary. Show it:

• 1 a clutch actuator in a side view with a piston-cylinder assembly in a first position;
• 2 : the piston-cylinder arrangement after 1 in a side view in a second position; and
• 3 a sensor target carrier ring in a first perspective view;
• 4 : the sensor target carrier ring after 3 in a second perspective view;
• 5 : Holder and reinforcing ring of sensor target carrier ring after 3 and in a perspective view;
• 6 : the sensor target carrier ring after 5 in a perspective view according to step c) of the method;
• 7 : the sensor target carrier ring after 6 in a perspective view according to step d) of the method;
• 8th : the sensor target carrier ring after 3 to 7 in a perspective view in section; and
• 9 : the sensor target carrier ring after 8th in a side view in section.

The 1 shows a clutch actuator 16 in a side view with a piston-cylinder arrangement 2 in a first position. 2 shows the piston-cylinder arrangement 2 to 1 in a side view in a second position. The 1 and 2 will be described together below.

The piston-cylinder arrangement 2 has one as a housing 3 formed hollow cylindrical cylinder 4 , one in the cylinder 4 along an axial direction 5 between a first position ( 1 ) and a second position ( 2 ) movable piston 6 as well as a sensor target carrier ring 1 on. A sensor 7 is for detecting one on the sensor target carrier ring 1 arranged sensor targets 8th on the housing 3 and the sensor target carrier ring 1 on the piston 6 arranged.

The clutch actuator 16 includes the piston-cylinder arrangement 2 as well as a release bearing 18 includes, wherein a friction clutch 17 over the release bearing 18 is operable.

3 shows a sensor target carrier ring 1 in a first perspective view. 4 shows the sensor target carrier ring 1 to 3 in a second perspective view. The 3 and 4 will be described together below.

The sensor target carrier ring 1 includes a holder 9 with the sensor target 8th , where the holder 9 made of plastic and the sensor target 8th is poured into the plastic. The sensor target carrier ring 1 includes a reinforcing ring 10 with a plurality of fasteners 11 , wherein the reinforcing ring 10 about a plastic deformation of the fasteners 11 with the holder 9 connected is.

The holder 9 is annular, with holder 9 , Piston 6 and reinforcing ring 1 are arranged coaxially with each other. The holder 9 and the reinforcing ring 10 each extend annularly, the sensor target 8th in a radial direction 12 spaced and outside of the reinforcing ring 10 is arranged.

The holder 9 has recordings 13 for each fastener 11 on, with each shot 13 for each fastener 11 a stop 14 opposite to a circumferential direction 15 formed. A twist of the holder 9 opposite the reinforcing ring 10 is thus at least after the deformation of the fasteners 11 not possible anymore.

5 shows holder 9 and reinforcing ring 10 of the sensor target carrier ring 1 to 3 and in a perspective view and according to steps a) and b) of the method.

6 shows the sensor target carrier ring 1 to 5 in a perspective view according to step c) of the method, wherein the fastening elements 11 in axial direction 5 in alignment with the recordings 13 are arranged.

7 shows the sensor target carrier ring 1 to 6 in a perspective view according to step d) of the method. In this case, a plastic forming of the fasteners 11 for connecting holder 9 and reinforcing ring 10 ,

8th shows the sensor target carrier ring 1 to 3 to 7 in a perspective view in section. 9 shows the sensor target carrier ring 1 to 8th in a side view in section. The 8th and 9 will be described together below.

Recognizable is the sensor target 8th completely from the material of the holder 9 enclosed in the holder 9 arranged. reinforcement ring 10 and holder 9 are about the fasteners 11 connected with each other.

LIST OF REFERENCE NUMBERS

1

Sensor target carrier ring

2

Piston-cylinder arrangement

3

casing

4

cylinder

5

axial direction

6

piston

7

sensor

8th

sensor target

9

holder

10

reinforcement ring

11

fastener

12

radial direction

13

admission

14

attack

15

circumferentially

16

Clutch actuator

17

friction clutch

18

release bearing

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 1898111 A2 [0003]
• DE 102016124269 A1 [0004]

Claims (8)

Sensor target carrier ring (1) for a piston-cylinder arrangement (2), wherein the piston-cylinder arrangement (2) designed as a housing (3) hollow cylindrical shaped cylinder (4) and one in the cylinder (4) along an axial direction ( 5) movable piston (6), wherein a sensor (7) for detecting a on the sensor target carrier ring (1) arranged sensor targets (8) on the housing (3) and the sensor target carrier ring (1) on the piston (6) are arranged; wherein the sensor target carrier ring (1) comprises a holder (9) with the sensor target (8), wherein the holder (9) consists of plastic and the sensor target (8) is cast into the plastic; wherein the sensor target carrier ring (1) comprises a reinforcing ring (10) with at least one fastening element (11), wherein the reinforcing ring (10) is connected to the holder (9) via a plastic deformation of the at least one fastening element (11). Sensor target carrier ring (1) after Claim 1 wherein the holder (9) and the reinforcing ring (10) each extend in an annular manner, wherein the sensor target (8) is spaced in a radial direction (12) and located outside of the reinforcing ring (10). A sensor target carrier ring (1) according to any one of the preceding claims, wherein the reinforcing ring (10) comprises a metallic material. Sensor target carrier ring (1) according to one of the preceding claims, wherein the holder (9) has a receptacle (13) for the at least one fastening element (11), wherein the receptacle (13) for the at least one fastening element (11) has a stop (14). relative to a circumferential direction (15) is formed. A sensor target carrier ring (1) according to any one of the preceding claims, wherein the reinforcing ring (10) comprises a plurality of fasteners (11) spaced along a circumferential direction (15). Method for producing a sensor target carrier ring (1) according to one of the preceding claims, comprising at least the following steps: a) providing a holder (9) with a sensor target (8), wherein the holder (9) consists of plastic and the sensor target (8) is cast in the plastic; b) providing a reinforcing ring (10); c) arranging holder (9) and reinforcing ring (10) to each other; d) plastic forming at least one fastening element (11) for connecting the holder (9) and reinforcing ring (10). Piston-cylinder arrangement (2), wherein the piston-cylinder arrangement (2) designed as a housing (3) hollow cylindrical cylinder (4), in the cylinder (4) along an axial direction (5) movable piston (6 ) and a sensor target carrier ring (1) according to one of the preceding Claims 1 to 5 executed or by the method according to Claim 6 wherein a sensor (7) for detecting a sensor target (8) arranged on the sensor target carrier ring (1) is arranged on the housing (3) and the sensor target carrier ring (1) on the piston (6). Clutch actuation device (16) for a friction clutch (17), at least comprising a piston-cylinder arrangement (2) according to Claim 7 and a release bearing (18), wherein a friction clutch (17) via the release bearing (18) is actuated.

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