CN110691919B

CN110691919B - Central separator with sensor that can be inserted into housing, central separator with piston and magnet fixed to piston, and method for assembling same

Info

Publication number: CN110691919B
Application number: CN201880036624.5A
Authority: CN
Inventors: M·霍夫曼; C·亨宁; P·瓦格纳
Original assignee: Schaeffler Technologies AG and Co KG
Current assignee: Schaeffler Technologies AG and Co KG
Priority date: 2017-06-01
Filing date: 2018-05-22
Publication date: 2022-02-25
Anticipated expiration: 2038-05-22
Also published as: DE102017112069A1; DE112018002780A5; WO2018219401A1; CN110691919A

Abstract

The invention relates to a central decoupler (1) for a clutch release system or a brake system of a motor vehicle, comprising a housing (2) in which a piston that can be displaced axially relative to the housing (2) can be arranged, and comprising a sensor (3) which is designed to detect the axial position of the piston relative to the housing (2), wherein the sensor (3) is fastened to the housing (2) by means of a retaining device (4), wherein the retaining device (4) is designed such that, during assembly, the sensor (3) is allowed to move in the retaining device (4). The invention further relates to a central separator (1) having a piston and a magnet fixed thereto, wherein the magnet and a sensor (3) are coordinated with one another in such a way that the position of the piston relative to the housing (2) can be detected. The invention further relates to an assembly method for mounting a displacement measuring sensor (3) on a housing (2) of a central separator (1), wherein a holding device (4) is formed on the housing (2), and the displacement measuring sensor (3) is axially inserted into the holding device (4).

Description

Central separator with sensor that can be inserted into housing, central separator with piston and magnet fixed to piston, and method for assembling same

Technical Field

The invention relates to a central decoupler/Clutch Slave Cylinder (CSC) for a hydraulic, electric or pneumatic Clutch release system of a motor vehicle, having a housing in which a piston is or can be arranged that can be displaced axially relative to the housing, and having a sensor/displacement measuring sensor/position sensor which is designed to detect the axial position of the piston relative to the housing. The invention further relates to such a central separator having a piston and a magnet fixed thereto, wherein the magnet and the sensor are coordinated with one another such that the position of the piston relative to the housing can be detected. The invention also relates to an assembly method for mounting a sensor/displacement measuring sensor on a central separator housing/casing, wherein a holding device is formed on the housing, into which the displacement measuring sensor is axially inserted.

Background

Central separators with a displacement measuring system for detecting the axial position of the piston have already been disclosed from the prior art. For example, DE 10242841B 4 discloses a release bearing for a clutch, comprising a body in the form of a cylinder as a whole and a piston which is supported axially displaceably in the interior of the body, wherein a ring belonging to a rolling bearing engages on the axially distal end of the piston, wherein an elastic pressure element is inserted axially between a proximal bearing surface mounted on the body and a distal bearing surface mounted on a flange engaging on the ring of the rolling bearing, wherein the release bearing has a contactless magnet comprising a magnet mounted on the flange and an object marker which is fixed in position relative to the body and which is arranged overall opposite the magnet for determining the position of the piston of the clutch release bearing relative to the body, wherein the flange comprises carrier arms, the carrier arm extends overall radially outward and carries the magnet overall on its radially outer end, wherein the magnet is embodied in the form of an insert, around which the carrier arm is (at least partially) formed.

In particular, EP 1898111D 1 also discloses a central decoupler for a hydraulic clutch actuating device, comprising a housing having a cylinder-shaped through opening and comprising a tubular sleeve which is arranged concentrically in the through opening and is fixed at one end to the housing in a centered manner, on which sleeve an annular piston which can be brought into operative connection with the clutch is guided in an axially displaceable manner, on the outer end of which sleeve an inner ring of a decoupling bearing is fixed, wherein a sensor for detecting the axial position of the annular piston relative to the housing is fixed to the housing in an undefined manner, wherein the sensor is assigned an axially displaceable guided magnet which is connected to an annular body which is fixed to the inner ring in an axially play-free manner for being entrained by the annular piston during an axial displacement of the annular piston, wherein the magnet is guided on the housing in a displaceable manner at a constant distance from the sensor and is displaceable and is guided in a displaceable manner relative to the annular body The guide shoes are fitted axially free of play but radially movably into the circumferential groove of the annular body.

However, this prior art still has the disadvantage that the magnet coupled to the piston projects radially from the piston, for example, via a carrier arm, and the sensor with the displacement measuring system is arranged radially around the magnet, so that a very large radial installation space is required for the position detection of the piston.

Disclosure of Invention

The object of the present invention is to avoid or at least reduce the disadvantages of the prior art. In particular, a central separator with a displacement measuring system should be developed, wherein the sensor connection for the central separator should be designed as space-neutral as possible, i.e., in particular in the radial direction, in a space-saving manner.

According to the invention, the object of the invention is achieved in a device of the generic type in that the sensor is fixed to the housing by a holding device, wherein the holding device is designed in such a way that, during assembly, the sensor is allowed to move in the holding device/is allowed to be inserted into the holding device.

This has the advantage that the sensor connection requires only a small additional radial installation space, since the sensor can be inserted, i.e. integrated, into the pressure wall of the housing. Furthermore, the solution of the invention provides advantages in terms of tightness and accuracy of the measurement of the axial position of the piston.

Advantageous embodiments are claimed in the dependent claims and are set forth in detail below.

It is also desirable for the sensor to be secured against rotational and axial movement in the holding device, for example, by a positive connection, a non-positive connection and/or a material-locking connection in the operating state of the central separator. It is thereby ensured that only the movement of the piston is detected by means of the magnet fixed to the piston in the housing and that the position detection is not influenced by an additional relative movement of the sensor relative to the housing.

It is also advantageous if the sensor is fixed in the holding device against axial movement relative to the housing by means of a preload spring, a compression and/or an axial stop. Thereby, the sensor can simply be inserted into the housing and then fixed by preloading the spring, pressing and/or axial stop. That is to say that the axial fixing of the sensor takes place only during assembly.

Alternatively, the sensor can also be fixed by a welded connection, a screw connection or a rivet connection. However, it is disadvantageous that these connections are more difficult to release than the connections suggested above, which are realized by preloading springs, pressing and/or axial stops.

Furthermore, it is advantageous if the axial stop is a stop ring. The stop ring can thus simply be pushed onto the housing on the outside for fixing the sensor in its final axial position. At the same time, the connection can be released very simply.

When using a preloaded spring as an axial securing element, this preloaded spring serves as a transport securing means.

Furthermore, it is advantageous if the holding device is designed as a rail. This forces the sensor during insertion. That is, the sensor may only be moved in one direction without being fixed. This solution also offers advantages in the fastening of the sensor to the housing.

It is also advantageous to form the retaining device on the housing such that it protrudes ribbed toward the radial outside. Then, a guide groove serving as a rail is also formed in the rib.

Advantageously, the holding device is of circular design, i.e. preferably has a circular outer surface or outer edge.

It is also desirable for the sensor to be arranged in a cover/sensor housing, wherein a groove or a tongue is formed as a retaining device on the cover or the housing, which groove or tongue interacts with the housing or the cover in a form-fitting manner. If the groove or tongue is configured on the housing, the cover can simply be inserted with its edge into the groove or under the tongue. If the groove or tongue is configured on the cover, the cover can simply be pushed over the housing by fitting a projection configured on the housing into the groove or under the tongue of the cover.

Furthermore, it is advantageous if the cover is L-shaped. That is, the cap has a portion directed in the axial direction and a portion directed in other directions, for example in a direction transverse to the axial direction or in a direction oblique to the axial direction. In this way, the connections/lines for the sensor can be simply connected.

It is also advantageous if the cover has one edge in which the sensor is arranged and a further edge for connecting a line.

It is also expedient for the sensor to be designed as a hall sensor, i.e. a sensor through which current flows.

It is furthermore advantageous if a tab projecting in the circumferential direction is formed on the cover or the housing, which tab interacts with the groove or the tongue in a form-fitting manner. That is, either the tabs on the housing are pushed through the slots on the cover or the tabs on the cover are inserted into the slots on the housing.

Furthermore, an advantageous embodiment is characterized in that the sheet is configured in a linear or curved manner. Thereby, a force-locking connection can be achieved under interaction with the groove or tongue.

It is advantageous here for the groove or tongue and the plate to be mutually coordinated so that a force-locking connection is produced between them, i.e. between the housing and the cover.

It is also possible to trim a region of the outside of the housing, against which the sensor and/or the cover with the sensor rests. Thus, the wall thickness separating the magnet mounted on the piston from the sensor is reduced, whereby position detection can be improved. Furthermore, the outer surface of the sensor can be matched to the outer surface of the housing in a simpler manner, since it is independent of the diameter of the housing due to the flattened section.

It is also advantageous if the surface of the cover facing the housing is adapted to the outer side of the housing, so that this surface preferably rests flush against this outer side. This saves radial installation space on the one hand and makes the insertion of the sensor easier on the other hand.

It is also advantageous if the housing is produced by injection molding, so that complex geometries of the housing can be realized in a simple manner. Here, the groove or tongue in the housing can be produced simply by placing the core.

It is also desirable for the sensor to be arranged on the outside of the pressure chamber of the central separator, which is surrounded by the housing.

The object of the invention is also achieved in that such a central separator has a piston and a magnet fixed to the piston, wherein the magnet and the sensor are coordinated with one another in such a way that the position of the piston relative to the housing can be detected.

The invention also relates to an assembly method for mounting a displacement measuring transducer on a central separator housing, wherein a holding device is formed on the housing, into which the displacement measuring transducer is axially inserted.

It is also advantageous if the displacement measuring sensor is fixed to the housing against axial displacement by means of a preloaded spring, a stop/axial stop, a press connection, a welded connection, a screw connection or a rivet connection.

It is also advantageous to place the sensor in the cover and to seal it against the surroundings by injecting a sealing medium, such as wax.

In other words, the invention relates to a direct displacement measurement on a clutch slave cylinder, wherein a particularly small installation space is required for the displacement measurement on the clutch slave cylinder. The solution of the invention is to move the sensor connection into the pressure wall of the central decoupler housing/clutch slave cylinder housing. For this purpose, a sensor, preferably a hall sensor, is fitted and sealed into the cover. The cover is provided here with circularly embodied rails/tabs. The guide rail is inserted into a matching counter shape in the housing, wherein the matching counter shape is configured as a groove or tongue. Finally, the sensor connection is fixed by applying an axial load, for example by a decoupling spring/preload spring or an axial stop.

Drawings

The invention is elucidated below with the aid of the drawing. In the drawings:

FIG. 1 shows a perspective view of a central separator housing with a displacement measuring sensor inserted into the housing;

FIG. 2 shows a top view of the sensor inserted into the housing;

FIG. 3 shows a perspective view of an alternative embodiment of a retaining device for attaching the sensor to the housing;

FIG. 4 shows a longitudinal cross-sectional view of a center clutch release;

FIG. 5 shows a perspective view of a clutch release bearing with a sensor inserted into a holding device of the housing and axial fixing by means of a preload spring;

FIG. 6 shows the sensor inserted into the housing with axial fixation by an axial stop;

FIG. 7 shows a longitudinal section of a clutch release bearing with an inserted sensor fixed by an axial stop;

FIG. 8 shows a perspective view of the component shown in FIG. 7;

FIG. 9 illustrates a method of assembling the sensor, wherein the sensor is inserted into a holder on the housing;

fig. 10 shows the displacement measuring sensor inserted into the housing.

Detailed Description

The figures are merely schematic features and are merely intended to provide an understanding of the present invention. Like elements are denoted by like reference numerals. The features of the different embodiments may be interchanged at will.

Fig. 1 shows a central decoupler/clutch slave cylinder 1 for a clutch decoupling system according to the invention. More precisely, a housing 2 of the central separator is shown, in which a piston which is axially displaceable relative to the housing 2 can be arranged. There is also a sensor/displacement measuring sensor/position sensor 3 designed to detect the axial position of the piston relative to the housing 2. The sensor 3 is fixed to the housing 2 by a holding device 4. The holding device 4 is designed such that it enables the sensor 3 to be moved/inserted into the holding device 4 during assembly in the holding device 4.

The retaining device 4 is formed on the housing 2 and projects in a ribbed manner radially outward. The sensor 3 is mounted in a cover/sensor housing 5 and sealed and inserted into the holding device 4. In the holding device 4, grooves 6 are formed which serve as rails 7 for guide rails 8 on the cover 5, which are formed as circumferentially projecting tabs 9.

The cover 5 for the sensor 3 is configured in an L-shape. The cover 5 has a first edge 10, which extends in the axial direction, rests against the housing 2 and in which the sensor 3 is mounted, and a second edge 11, which extends in the radial direction, protrudes from the housing 2 and to which a line 12 for supplying the sensor 3 is connected. The wires 12 are held by clips 13, soldered or welded to the cover 5 or to the sensor 3 by pins or pins.

In fig. 2, it can be seen that the cover 5 is adapted to the outer contour of the housing 2 and rests flush against the housing 2. The tab 9 is straight and fits into the groove 6 of the holding device 4. The first edge 10 of the cover 5 lies in the region of the outer diameter of the housing 10 with the flattening 14. The groove 6 of the holding device 4 is configured such that the tab 9 can be inserted in the axial direction.

Fig. 3 shows an alternative embodiment of the retaining means 4 on the housing 2. In contrast to the retaining device 4 in fig. 2, the groove 6 is configured with a smaller depth. The groove 6 has a rectangular cross section. The outer edge 15 of the holding device 4 is provided with a radius 16.

Fig. 4 and 5 show a central separator 1 with a housing 2 and interacting components. A release bearing 18, which can be displaced in the axial direction by a piston, not shown, is arranged on the inner housing shell 17. Which is arranged in said housing 2. A magnet is fixed to the piston which interacts with the sensor 3 to allow the axial position and thus the position of the release bearing 18 to be determined. The holding device 4, which accommodates the sensor 3, is integrated in an outer housing shell 19 of the housing 2.

The axial position of the cover 5 with the sensor 3 is determined by a preload spring 20 which presses the cover 5 in the axial direction against a flange 21 formed on the housing 2 or against a projection 22 formed on the holding device 4, so that the sensor is attached to the housing 2 in a rotationally fixed and axially fixed manner by means of the rails 7 of the holding device 4, the preload spring 20 and the flange 21.

Fig. 6 to 8 show an alternative axial fixing of the cover 5 with the sensor 3. As in the above-described embodiment, the sensor 3 is inserted (from above in the drawing) into the rail 7 of the holding device 4 on the housing 2. The lid 3 is axially fixed by a stop, which is configured as a stop ring 23. The stop ring 23 has a radial flange 24 which projects radially inward and is supported in the assembled state on the axial front side of the outer housing shell 19. The ring section 25 of the stop ring 23, which is arranged radially at the level of the cover 5, prevents the cover 5 from sliding out of the retaining device 4 axially. That is, the cover 5 is axially and rotationally fixed to the housing 2 via the projections 22, the stop ring 23 and the rails 7.

The cap 5 can also be pressed into the holding device 4, so that axial movement is prevented by pressing or pressing.

Fig. 9 and 10 show the assembly steps of the sensor 3 on the housing 2. A cover 5, in which the sensor 3 is mounted, is inserted in the axial direction into the holding means 4 on the housing 2. The tab 9 on the lid has a centering lug 26 projecting in the circumferential direction. The cover 5 is inserted so that the tab 9 fits into the track 6. The insertion is guided by the centering noses 26. In fig. 10, the cover 5 is inserted into the rail 7. Then, the stop ring 23 (see fig. 6, 7 and 8) or the preload spring 20 (see fig. 4 and 5) is slipped on, thereby axially fixing the cap 5.

List of reference numerals

1 Central decoupler/Clutch slave Cylinder

2 shell/Central separator Shell

3 sensor/displacement measuring sensor/position sensor

4 holding device

5 cover/sensor housing

6 grooves

7 rail

8 guide rail

9 pieces

10 first side

11 second side

12 conducting wire

13 clip

14 flattening part

15 outer edge

16 radius

17 inner housing shell

18 throw-out bearing

19 outer housing shell

20 preloaded spring

21 Flange

22 projection

23 stop ring

24 radial flange

25 ring segment

26 centering nose.

Claims

1. A central decoupler (1) for a clutch release system or a brake system of a motor vehicle, having a housing (2) in which a piston which is axially displaceable relative to the housing (2) can be arranged, and having a sensor (3) which is designed to detect the axial position of the piston relative to the housing (2), characterized in that the housing (2) comprises an inner housing shell (17) which is located radially inside and an outer housing shell (19) which is located radially outside the inner housing shell (17), a pressure chamber accommodating the piston being formed between an outer side face of the inner housing shell (17) and an inner side face of the outer housing shell (19);

the sensor (3) is fixed on the outer side of the housing shell (19) by a holding device (4), wherein the holding device (4) is designed in such a way that the sensor (3) is allowed to move in the holding device (4) when being assembled;

wherein the outer housing shell (19) comprises a cylindrical section extending in the axial direction, the inner side surface of the cylindrical section is used for forming the side wall surface of the pressure chamber of the piston, and the sensor (3) is fixed on the outer side surface of the cylindrical section of the outer housing shell (19) through a holding device (4).

2. Central separator (1) according to claim 1, characterized in that in the operating state of the central separator (1) the sensor (3) is fixed against rotational and axial movement in the holding device (4).

3. Central separator (1) according to claim 2, characterized in that the sensor (3) is fixed against axial movement in the holding device (4) by means of a preload spring (20), a compression and/or an axial stop (23).

4. Central separator (1) according to claim 1, characterized in that the holding means (4) are configured as rails (7).

5. Central separator (1) according to claim 1, characterized in that the sensor (3) is arranged in a cover (5), wherein a groove (6) or a tongue interacting with the housing (2) or with the cover (5) in a form-fitting manner is formed as a retaining device (4) on the cover (5) or the housing (2).

6. Central separator (1) according to claim 5, characterized in that a tab (9) is constructed on the cover (5) or the housing (2), which tab interacts positively with the groove (6) or with the tongue.

7. Central separator (1) according to claim 5, characterized in that the sensor (3) and/or the cover (5) with the sensor (3) rest against an area (14) of the outside of the housing (2), which is flattened.

8. A central separator (1) according to any of claims 5 to 7, characterized in that the face of the cover (5) facing the housing (2) is coordinated with the outside of the housing (2) so that the face of the cover (5) rests on the outside of the housing (2).

9. Central separator (1) according to one of claims 1 to 7, having a piston and a magnet fixed thereon, wherein the magnet and the sensor (3) are coordinated with each other so that the position of the piston relative to the housing (2) can be detected.

10. A central separator (1) according to claim 8, having a piston and a magnet fixed thereto, wherein the magnet and the sensor (3) are coordinated with each other to enable detection of the position of the piston relative to the housing (2).

11. An assembly method for mounting a displacement measuring sensor (3) on a housing (2) of a central separator (1), wherein a holding device (4) is formed on the housing (2), the displacement measuring sensor (3) being inserted axially into the holding device (4), whereby it can be retained at one axial end by a flange formed on the housing or a projection formed on the holding device; the displacement monitoring sensor is then secured to the housing against axial movement at the other axial end by means of a preloaded spring or stop.