WO2018219401A1

WO2018219401A1 - Central release mechanism having a sensor that can be slid into a housing, central release mechanism having a piston and a magnet fastened thereto, and assembly method

Info

Publication number: WO2018219401A1
Application number: PCT/DE2018/100485
Authority: WO
Inventors: Michael Hofmann; Christian Henning; Philippe Wagner
Original assignee: Schaeffler Technologies AG & Co. KG
Priority date: 2017-06-01
Filing date: 2018-05-22
Publication date: 2018-12-06
Also published as: DE102017112069A1; CN110691919B; DE112018002780A5; CN110691919A

Abstract

The invention relates to a central release mechanism (1) for a clutch release system or braking system of a motor vehicle, comprising a housing (2), in which a piston can be arranged, which piston can be axially moved relative to the housing (2), and comprising a sensor (3), which is designed to sense the axial position of the piston relative to the housing (2), the sensor (3) being fastened to the housing (2) by means of a retainer (4), the retainer (4) being designed in such a way that, during assembly, sliding of the sensor (3) in the retainer (4) is enabled. The invention further relates to a central release mechanism (1), comprising a piston and a magnet fastened to the piston, the magnet and a sensor (3) being coordinated with each other in such a way that the position of the piston relative to the housing (2) can be sensed. The invention further relates to an assembly method for attaching a displacement measurement sensor (3) to a housing (2) of a central release mechanism (1), a retainer (4) being formed on the housing (2), into which retainer the displacement measurement sensor (3) is axially slid.

Description

Central release with housing insertable sensor, central release with

Piston and attached magnet and mounting method

The invention relates to a CSC (Clutch Slave Cylinder) for a hydraulic, electric or pneumatic clutch release system or brake system of a motor vehicle, comprising a housing in which a relative to the housing axially displaceable piston can be arranged / can be arranged, and with a sensor / displacement sensor / position sensor designed to detect an axial position of the piston relative to the housing. Furthermore, the invention relates to such a central release with a piston and a magnet mounted on the piston, wherein the magnet and the sensor are coordinated so that the position of the piston relative to the housing can be detected. Furthermore, the invention relates to a mounting method for attaching a sensor / displacement sensor to a Zentralausrücker housing / housing, wherein on the housing a holder is formed, in which the Wegmesssensor is inserted axially.

Zentralausrücker are already known from the prior art, which have a displacement measuring system for detecting the axial position of the piston. For example, DE 102 42 841 B4 discloses a clutch release bearing comprising a main body of generally cylindrical shape and a piston axially slidably supported inside the main body, a ring associated with a rolling bearing at the distal axial end of the bearing Piston is attached, wherein an elastic pressure element is inserted axially between a main body attached to the proximal bearing surface and a distal support surface which is attached to a ring attached to the bearing of the bearing, the release bearing having a non-contact magnetic encoder, which is mounted on a collar Magnet and a stationary in relation to the main body target mark, which is arranged opposite to the magnet in order to determine the axial position of the piston of the clutch release bearing relative to the main body, wherein the collar comprises a support arm, the erstrec total radially outward kt and carries the magnet in total at its outer radial end and wherein the magnet in Is executed in the form of an insert, around which, at least partially, the support arm is formed.

Among other things, EP 1 898 11 1 D1 also discloses a central release device for a hydraulic clutch actuation, comprising a housing having a cylindrical through-bore and a tubular sleeve arranged concentrically within the through-bore and centered on the housing at one end thereof on which an annular piston which can be operatively connected to the coupling is guided so as to be axially displaceable, at the outer end of which the inner ring of a release bearing is fastened, a sensor for detecting the axial position of the annular piston being fixedly attached to the housing relative to the housing, and wherein the sensor an axially displaceably guided magnetic body is associated, which is connected axially free of play with an annular ring attached to the inner ring for driving through the annular piston at the axial displacements, the magnetic body with a constant displacement over its displacement to the sensor on the housing gefü Hrt is and with a guide shoe in a circumferential groove of the annular body axially free of play, but engages radially movable.

However, the prior art always has the disadvantage that the magnet coupled to the piston extends radially from the piston, e.g. B. via a support arm, projects and the sensor is arranged with the displacement sensor radially surrounding the magnet, so that a very large radial space for the position detection of the piston is required.

It is therefore the object of the invention to avoid or at least reduce the disadvantages of the prior art. In particular, a Zentralausrücker to be developed with a distance measuring system, in which a sensor connection for the Zentralausrücker possible space-neutral, so especially radially space-saving designed.

The object of the invention is achieved in a generic device according to the invention characterized in that the sensor attached via a holder on the housing is, wherein the holder is designed so that a displacement / insertion of the sensor in the holder / in the holder is made possible during assembly.

This has the advantage that the sensor connection requires only a small additional radial space since the sensor can be pushed into the pressure wall of the housing, ie it can be integrated. In addition, the solution according to the invention offers advantages in terms of the tightness and the precision of the measurement results of the axial position of the piston.

Advantageous embodiments are claimed in the subclaims and are explained in more detail below.

In addition, it is expedient if the sensor is secured in an operating state of the central release in the holder against rotational and axial movement, such as a form, force and / or material connection. This ensures that only the displacement of the piston is detected with a magnet mounted on the piston within the housing, and the position detection is not influenced by an additional relative movement of the sensor relative to the housing.

Furthermore, it is advantageous if the sensor is secured in the holder via a preload spring, a compression and / or an axial stop against an axial movement relative to the housing. Thus, the sensor can thus be simply inserted into the housing and then secured by the preload spring, the compression and / or the axial stop. The axial fixation of the sensor is therefore produced only during assembly.

Alternatively, it is also possible to fix the sensor via a welded, screwed or riveted joint. The disadvantage of this, however, is that these compounds are only harder to solve than the above proposed compounds via a preload spring, the compression and / or the axial stop. Furthermore, it is advantageous if the axial stop is designed as a stop ring. Thus, the stopper ring can thus be simply pushed outside of the housing to fix the sensor in its final, axial position. At the same time, this connection is very easy to solve again.

When using a preload spring as an axial securing element, the preload spring thus serves as a transport lock.

In addition, it is advantageous if the holder is designed as a rail. As a result, the leadership of the sensor during insertion is thus forced. The sensor can therefore also move without fixing only in one direction. This also offers advantages in fixing the sensor to the housing.

Further, it is advantageous if the holder is formed on the housing so that it protrudes rib-like radially outward. In this rib are then also guide grooves, which serve as rails formed.

It is advantageous if the holder is round, preferably therefore has a round outer surface or outer edge.

In addition, it is expedient if the sensor is arranged in a cover / sensor housing, wherein grooves or nubs are formed as a holder on the cover or the housing, which cooperate positively with the housing or the lid. If the grooves or the nubs formed on the housing, the lid can be easily inserted over its edges in these grooves or under these nubs. When the grooves or nubs are formed on the lid, the lid can be simply slid onto the housing by engaging projections formed on the housing into the grooves or under the nubs of the lid.

Furthermore, it is advantageous if the lid is L-shaped. That is, the lid has an axially facing part and a part which is in a other direction shows, z. B. in a direction which is transverse to the axial direction or a direction which is inclined to the axial direction has. This makes it easy to connect the connections / lines for the sensor.

Moreover, it is advantageous if so the lid has a leg, in which the sensor is arranged, and has a different leg, which serves for line connection.

Furthermore, it is expedient if the sensor is designed as a Hall sensor, that is, a current-carrying sensor.

In addition, it is advantageous if tabs which protrude in the circumferential direction are formed on the cover or the housing, which interact in a form-fitting manner with the grooves or with the studs. Either the tabs on the housing are therefore pushed by the grooves on the cover, or the tabs on the lid are inserted into the grooves in the housing.

Furthermore, a favorable embodiment is characterized in that the tabs are formed linear / straight or curved. Thus, in conjunction with the grooves or the nubs a frictional connection can be achieved.

Moreover, it is advantageous if the grooves or nubs are tuned to the tabs, that a positive connection between them, ie between the housing and the lid is formed.

Also, a region of the outside of the housing, on which the sensor and / or the cover abut with the sensor, be flattened. Thereby, the wall thickness separating the magnet attached to the piston from the sensor is reduced, so that position detection is improved. In addition, it is easier to match the outer surface of the sensor to the outer surface of the housing, as it is independent of the diameter of the housing due to the flattening. Further, it is advantageous if a housing facing the surface of the lid is matched to the outside of the housing, that the surface on the outside, preferably flush, is applied. Thus, on the one hand saves radial space and on the other hand facilitates insertion of the sensor.

It is also advantageous if the housing is produced by injection molding, so that a complex geometry of the housing can be easily achieved. The grooves or nubs in the housing can be easily manufactured by the use of cores.

It is also expedient if the sensor is arranged on the outside of a pressure chamber surrounded by the housing of the central release.

The object of the invention is also achieved by using such a central retractor with a piston and a magnet mounted on the piston, the magnet and the sensor being matched to one another so that the position of the piston relative to the housing can be detected ,

Furthermore, the invention relates to a mounting method for attaching a displacement measuring sensor to a Zentralausrücker housing, wherein on the housing a holder is formed, in which the Wegmesssensor is inserted axially.

It is also advantageous if the displacement sensor with a preload spring, a stop / axial stop, a press connection, a welded connection, a screw connection or a riveted connection to the housing is fixed against axial displacement.

It is also advantageous if the sensor is inserted in a lid, and by inserting a sealant, for. As a wax is sealed to the environment. In other words, the invention relates to a direct displacement measurement on a clutch slave cylinder, in which particularly small space is required for the travel measurement on the clutch slave cylinder. The inventive solution is that the sensor connection is inserted into the pressure wall of the Zentralausrücker- / Kupplungsnehmerzylinder housing. For this purpose, therefore, a sensor, preferably a Hall sensor, mounted in a lid and sealed. The lid is equipped with round guide rails / tabs. These guide rails are thus inserted into the appropriate counter-mold in the housing, wherein the matching counter-mold is formed as grooves or nubs. The fixed fixation of the sensor connection is finally by the application of an axial load, z. B. by a disengagement spring / preload spring or an axial stop.

The invention will be explained below with the aid of drawings. Show it:

1 is a perspective view of a Zentralausrücker housing with an inserted into the housing sensor for measuring distance,

2 is a plan view of the inserted into the housing sensor,

3 is a perspective view of an alternative embodiment of a holder for the sensor connection to the housing,

4 is a longitudinal sectional view of a clutch release bearing,

5 shows a perspective view of the clutch release bearing with inserted sensor in the holder in the housing and an axial securing via a preload spring,

6 is a perspective view of the inserted into the housing sensor with an axial securing an axial stop, 7 is a longitudinal sectional view of the clutch release bearing secured via the axial stop, inserted sensor,

8 is a perspective view of the components shown in FIG. 7,

9 shows a mounting method of the sensor, in which the sensor is inserted into the holder on the housing, and

Fig. 10 the inserted into the housing sensor for the distance measurement.

The drawings are merely schematic in nature and are for the sole purpose of understanding the invention. The same elements are identified by the same reference numerals. The features of the different embodiments can be interchanged arbitrarily.

Fig. 1 shows a Zentralausrücker / clutch slave cylinder 1 according to the invention for a clutch release system. More specifically, a housing 2 of the Zentralausrückers is shown, in which a relative to the housing 2 axially displaceable piston can be arranged. Also, a sensor / displacement sensor / position sensor 3 is provided, which is designed to detect an axial position of the piston relative to the housing 2. In this case, the sensor 3 is fastened to the housing 2 via a holder 4. The holder 4 is designed so that it allows the sensor 3 during assembly in the holder 4 can be moved / inserted into the holder 4.

The holder 4 is formed on the housing 2 and protrudes rib-like radially outward. The sensor 3 is inserted and sealed in a cover / sensor housing 5 and is inserted into the holder 4. In the holder 4 grooves 6 are formed, which serve as a rail 7 for the guide rails 8, which are formed as protruding in the circumferential direction tabs 9, on the lid 5. The cover 5 for the sensor 3 is L-shaped. The cover 5 thus has a first leg 10, which extends in the axial direction, rests against the housing 2 and in which the sensor 3 is inserted, and a second leg 1 1, which extends in the radial direction, which projects from the housing 2 and at which lines 12 connect to the power supply of the sensor 3. About brackets 13, the lines 12 are held, which are soldered or welded via pins to the cover 5 and to the sensor 3.

In FIG. 2 it can be seen that the cover 5 is fitted to the outer contour of the housing 2 and rests flush against the housing 2. The tabs 9 are straight and fit into the grooves 6 of the holder 4 a. The first leg 10 of the lid 5 abuts against a region on the outer diameter of the housing 2, which has a flattening 14. The grooves 6 of the holder 4 are formed so that the tabs 9 can be inserted in the axial direction.

Fig. 3 shows an alternative embodiment of the holder 4 on the housing 2. In contrast to the holder 4 of Fig. 2, the grooves 6 are formed with a smaller depth. The grooves 6 have a rectangular cross-section. The outer edges 15 of the holder 4 are provided with a radius 16.

FIGS. 4 and 5 show the central release 1 with the housing 2 and cooperating components. On an inner housing shell 17, the release bearing 18 is arranged, which can be displaced by a piston, not shown, in the axial direction. The piston is arranged in the housing 2. On the piston, a magnet is fixed, which allows in cooperation with the sensor 3, a determination of the axial position, and thus the position of the release bearing 18. On an outer housing shell 19 of the housing 2, the holder 4 is integrated, which receives the sensor 3.

The axial position of the cover 5 with the sensor 3 is determined by a preload spring 20, which presses the cover 5 in an axial direction against a housing 2 formed on the flange 21 and to a support 4 formed on the projection 22, so that the sensor the rails 7 of the holder 4, the preload spring 20 and the flange 21 is rotationally and axially fixed to the housing 2 is connected. FIGS. 6-8 show an alternative axial fixing of the cover 5 to the sensor 3. As in the embodiment described above, the sensor 3 (in the drawings from above) is inserted into the rails 7 of the holder 4 on the housing 2. The lid 5 is fixed axially via a stop which is designed as a stop ring 23. The stop ring 23 has a radial flange 24, which protrudes radially inward and, in the mounted state, rests on the axial front side of the outer housing shell 19. By a ring portion 25 of the stop ring 23, which is arranged radially at the level of the lid 5, prevents the lid 5 can be pushed out of the holder 4 axially. The cover 5 is thus fixed axially and rotationally fixed on the housing 2 via the projection 22, the stop ring 23 and the rails 7.

The lid 5 can also be pressed into the holder 4, so that an axial movement is prevented by a compression.

9 and 10 show the assembly steps of the sensor 3 on the housing 2. The cover 5, in which the sensor 3 is inserted, is inserted in an axial direction in the holder 4 on the housing 2. In this case, the tabs 9 on the lid in the circumferential direction projecting centering noses 26. The cover 5 is inserted so that the tabs 9 engage in the rails 6. Through the centering 26, the insertion is performed. In Fig. 10, the lid 5 is inserted into the rails 7. Then a stop ring 23 (compare Figures 6, 7 and 8) or a preload spring 20 (see Figures 4 and 5) is pushed, so that the cover 5 is fixed axially.

LIST OF REFERENCES

Central Slave Cylinder / Clutch Slave Cylinder Housing / Central Slave Cylinder Housing

Sensor / Displacement Sensor / Position Sensor Mount

Cover / sensor housing

groove

rail

guide rail

flap

first leg

second leg

management

clip

flattening

outer edge

radius

Inner housing shell

release bearing

Outer shell

preload

flange

head Start

stop ring

radial flange

ring section

centering

Claims

claims

1 . Central release device (1) for a clutch release system or brake system of a motor vehicle, comprising a housing (2) in which a piston axially displaceable relative to the housing (2) can be arranged, and a sensor (3) which is designed to be in an axial position the piston relative to the housing (2), characterized in that the sensor (3) via a holder (4) on the housing (2) is fixed, wherein the holder (4) is designed so that when mounting a Displacement of the sensor (3) in the holder (4) is made possible.

Second central release device (1) according to claim 1, characterized in that the sensor (3) in an operating state of the central release (1) in the holder

(4) is secured against rotation and axial movement.

3. central release (1) according to claim 2, characterized in that the sensor (3) in the holder (4) via a preload spring (20), a compression and / or an axial stop (23) is secured against the axial movement.

4. Zentralausrücker (1) according to one of claims 1 to 3, characterized in that the holder (4) is designed as a rail (7).

5. Zentralausrücker (1) according to one of claims 1 to 4, characterized in that the sensor (3) in a cover (5) is arranged, wherein as a holder (4) on the cover (5) or the housing (2) Grooves (6) or studs are formed, the form-fitting manner with the housing (2) or with the lid

(5) interact.

6. Zentralausrücker (1) according to claim 5, characterized in that on the cover (5) or the housing (2) tabs (9) are formed, which cooperate positively with the grooves (6) or with the knobs.

7. Zentralausrücker (1) according to claim 5 or 6, characterized in that an area (14) of the outside of the housing (2) on which the sensor (3) and / or the lid (5) with the sensor (3) is present, flattened.

8. Zentralausrücker (1) according to one of claims 5 to 7, characterized in that the housing (2) facing surface of the lid (5) is adapted to the outside of the housing (2) that the surface of the lid (5 ) rests against the outside of the housing (2).

9. central release device (1) according to one of claims 1 to 8 with a piston and a magnet mounted on the piston, wherein the magnet and a sensor (3) are coordinated so that the position of the piston relative to the housing (2) is detectable.

10. Mounting method for attaching a distance measuring sensor (3) on a housing (2) of a Zentralausrückers (1), wherein on the housing (2) has a holder (4) is formed, in which the Wegmesssensor (3) is inserted axially.