DE3326349A1 - CONTROL ACTUATION FOR A FRICTION CLUTCH - Google Patents

Description

The present invention relates to a control actuator which by means of elastic means in the engaged Position is held, this control actuator having an actuating linkage with a motor.

In general, in such a clutch, a friction disc is under the influence of a spring, usually a disc spring, clamped together between a counter pressure plate and a pressure plate. The clutch is under the influence the plate spring in the engaged state, the plate spring, which is connected to one with the counter pressure plate Supports cover, exerts a resilient clamping effect on the pressure plate.

Bank details: Bayer. Vereinibank Mönchen, Account 620404 (BLZ 700 202 70)

Poiticheckkonto: Munich 27044-802 (BLZ 70010080) (only PA Dipl.-Ing.S. Stoecjer)

The clutch is designed to be engaged from this engaged state to a disengaged state is transferred into the coupling linkage.

This coupling linkage generally has a longitudinal direction movable releaser, which is referred to as the clutch release and which is on a central area of the plate spring acts to selectively interrupt the clamping action of the plate spring on the pressure plate. Except for this releaser the linkage also has a kinematic chain, which usually consists of a fork, levers, etc.

With the controls for friction clutches that are still in use today the boom is equipped with a lifting path that covers the actually used part of the lifting path on both sides towers above, the ends each corresponding to an engaged and a disengaged position of the clutch.

Such a superfluous way of the linkage is not afflicted with disadvantages if the linkage, for example, by a clutch pedal is operated manually, and is general with satisfactory results with a backlash or Play between the full rest position of the clutch pedal and a position in which the pedal is slightly depressed is and from which the linkage begins to disengage the clutch, equipped, this game as a protective game referred to as.

When the clutch disc, commonly called a friction or drive plate is designated, wears out, then this protection clearance is reduced, which leads to periodic maintenance work leads to make this game wxeder.

The inventor has found, however, that such superfluous way of the linkage with regard to its actually used part of the way has disadvantages if the motorized Means of the linkage not manually, such as by means of

of a pe-

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dais, but can be controlled automatically and from one Electric, hydraulic, pneumatic or other motor exist.

In such a case it is important that the power of the engine, not only from the moment, but in the same Way depends on the path, both for reasons of energy economy and for reasons of easier controllability is, and it is therefore of considerable importance that the path of the linkage to the part of its actual range of use is reduced.

However, there arises a problem resulting from the fact that the friction causes wear, which is im The path of the boom changed over the course of the service life.

The inventor has found that this change in the path of the linkage does not affect the actual extent of the range of use changes, but leads to a general shift in this area of use. The inventor has a solution found to limit the path of the linkage to its area of use by limiting this path with a constant predetermined amplitude, but is provided with terminals, which as a function of the frictional wear of the clutch are changeable.

The present invention has for its object to provide a control actuator for a friction clutch which is returned to the engaged position by means of spring means, in which a linkage with motor means is provided, the actuation path of the linkage being limited to the area which is actually needed , regardless of whether the condition of the friction clutch is new or used, ie already showing frictional wear .

The object is achieved according to the invention in that limit switches, which are assigned to the motor, allow it to act limit, an arrangement of two at a distance from each other

have arranged Kontaktklemraen, between which a with the rod connected follower pin is displaceable and interrupts the actuation of the motor when he does one of the two Contact terminals achieved, and that the arrangement furthermore itself compatible with the path of the stylus Is displaceable away, which, driven by the linkage, moves along with the wear and tear of the friction or drive plate.

Thanks to this training, the stroke of the boom is limited to its actual range of use; moreover is the The range of use of the boom stroke is automatically not in amplitude, but in the position by means of direct actuation of the linkage can be changed to the extent of the frictional wear.

It goes without saying that when replacing a worn friction disc with a new one, the changeable arrangement in the Initial position of the new state is reset.

According to a further feature, the arrangement, consisting of two contact clips, is on one essentially parallel to the Slidably arranged slide rail running away from the follower pin, between the arrangement of the two contact terminals and friction means are provided on the slide rail. These friction means are intended that the changeable arrangement cannot move incorrectly outside of the drive, which is caused by the linkage to the extent of the wear is effected.

The slidable mounting arrangement of the changeable arrangement can be provided with a straight or curved path, in the latter case, this mounting arrangement, for example, by a pivotable arrangement or by such can be replaced with a cam.

According to a further feature, the linkage comprises a lever which in the state of engagement of the clutch on pressure

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cooperates with a support of the arrangement of the two contact terminals. In one embodiment, the arrangement also sends the two contact terminals and the follower pin send a signal to an electronic control box, which puts the motor out of operation sets when the scanner reaches one of the two contact terminals and the operational action tends to override it.

The arrangement of the two contact terminals has, for example an electrical potentiometer, while the stylus has a sliding contact which cooperates with the potentiometer; In a variant, the arrangement of the two contact terminals comprises two electrical contacts, and the stylus has a finger, which interacts with these electrical contacts.

The motor can be of any suitable type, for example an electric motor driven by a control signal from the clutch is controlled, or a hydraulic or pneumatic piston that is operated by means of an electrovalve which is itself controlled via the electrical control signal; however, it can also be any other suitable form be used.

In the further embodiments of the invention are based on. Drawings described in more detail.
Show it:

Figure 1 is a schematic view of a control actuation according to the invention of a friction clutch, wherein the friction lining is new and the clutch is shown in the engaged state;

Figure 2 is a view similar to Figure 1, but is located the clutch in the disengaged state;

FIG. 3 is a view analogous to that in FIG. 1, in which the clutch is in the engaged position Condition is, however, the friction linings are worn;

FIG. 4 a view analogous to that in FIG. 3, the clutch is shown in the disengaged state, and

FIG. 5 shows a view analogous to FIG. 1 relating to an embodiment variant.

Reference is first made to FIGS. 1 to 4, which use it as a non-limiting example of the invention represents the invention in a control actuation in a clutch with a plate spring, in particular for motor vehicles.

The coupling shown in these Figures 1 to 4 comprises a cover 10 which is attached to a flywheel 11 of the engine of the vehicle is attached. The flywheel 11 forms a counter pressure plate. The clutch also has a driver or friction disk 12 which is connected to an input shaft 13 of the Transmission of the vehicle is coupled. The friction disc 12. is between the counter pressure plate 11 and a pressure plate 14, which is attached to the cover 10, clamped under the clamping action of a spring 15 designed as a plate spring .

The plate spring 15 is supported at the reference number 16 on the cover 10 and has fingers 17 in its inner area, which are designed so that they can be pushed to the left in FIG. 1 by means of a releaser 18, if desired is, the clutch from the engaged state, as shown in Figure 1, wherein the releaser 18 without Action on the plate spring 15 is to be transferred into a disengaged state, as shown in Figure 2, in the the releaser 18 presses on the plate spring 15 and the clamping

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actuation on the plate 14 interrupts, whereby the friction disc 12 is released.

The releaser 18 is part of a linkage 18,19,24, the one a spring 19A associated lever 19 which is rotatably supported about a fixed pivot point or an axis 20. This lever generally bears due to the shape of its first end 21, which is the releaser 18, which is next to the plate spring 15 is located, is assigned the designation fork.

In the area of its second end 22, the lever 19 is attached at the reference number 23 to a pulling element, which can be formed, for example, by a rod, a cable or the like. This connection is provided with a small play ^N .J "when the clutch is in the engaged position so that the lever is not exposed to the action of the plate spring meshes with a pinion 27 which is driven by an electric motor 28.

When the electric motor 28 rotates in the direction which corresponds to a pulling operation of the pulling element 24, to the right _t in FIG. 1, the lever 19 changes from the position in FIG. 1 to that of FIG. 2, causing the clutch to be disengaged. When the motor 28 rotates in the opposite direction, the plate spring 15 is allowed to return the clutch from the disengaged position of Figure 2 to the engaged position of Figure 1, in which the tension member 24 is completely without tension.

According to the invention are means for limiting the pulling path of the linkage provided on its actual area of use, the ends of which are respectively the indented and the disengaged Corresponding to the clutch position, both when the friction disk 12 is new and when it is worn.

For this purpose, the limit switches that control the motor

Means 28 for interrupting the rotary movement are assigned, an arrangement of two arranged at a distance from one another Contact terminals 29 and 30, between which a follower pin 31 moves. The stylus 31 is with connected to the linkage 18, 19, 24 by being attached to the pulling element 24. It is designed to support the rotational movement of the to interrupt motor means 28 when it has reached one of the two contact terminals 29 and 30, in the manner that the control actuation does not leave the set limits. The arrangement 29, 30 is provided as changeable and itself slidable along a path compatible with that of the stylus 31. The arrangement is further adapted, via a drive by means of the end 22 of the lever to the extent of the wear of the friction disc 12 of the clutch hike. In the exemplary embodiment of FIGS. 1 to 4, in particular the second end 22 of the lever 19 is working Pressure with a counter bearing 32 of a slide 33 together, on which the contact terminals 29 and 30 are arranged, and which is displaceable along a slide rail 34. Friction means 35 are located between the carriage 33 and the slide rail 34 provided to prevent any erroneous displacement of the carriage 33 other than the displacement resulting from the drive of the carriage 33 happens via the end 22 of the lever 19 onto the support 32. These friction means 35 exist for example from a shoe that counteracts with considerable spring force the slide rail 34 is clamped, but they can equally take any other suitable shape, for example Arch rings etc.

The carriage carries an electric potentiometer 36, its Ends form the two contact terminals 29 and 30 at the end of the stroke. The stylus 31 consists of an electrical one Sliding contact or cursor that interacts with the potentiometer 36.

The electric motor 28 is controlled by various signals, which are shown schematically by means of the arrow 37 and enter the electronic control box, from which the

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Electric motor 28 is controlled. Among these signals, from one of which is indicated by arrow 37A is a stop signal for rotational movement that is generated in response to the Position of the cursor 31 on the potentiometer 36 is sent out when this cursor 31 is one of the two ends 29 and of the potentiometer 36 is reached. This stop signal 37A has priority over the other signals 37 with respect to the direction of rotation of the electric motor 28, in such a way that the stroke of the linkage 24 is always limited to its area of use which lies between the two ends 29 and 30 of the potentiometer 36.

FIG. 1 shows a clutch with a new friction disk 12 shown in the engaged position, in which the linkage 18, 19,24 releases the plate spring 15, which the friction disc wedged between the two plates 11 and 14. To the clutch * to move out, a signal will be sent from the electronic control box 38 output, whereby the motor 28 rotates in the direction that a displacement of the pulling member 24 in Figure 1 corresponds to the right. During this shift, the cursor 31 moves on the potentiometer 36 and leaves the Motor 28 in operation when the other signals 37 in turn keep it active; this happens until the cursor 31 ends 30 of the potentiometer 36 is reached. In such a position, the signal transmitted at 37A is used as a stop signal interpreted for the motor, in the sense of uncoupling, which opens the way for disconnection to the actual area of use limited, but the same signal allows the motor to rotate in the opposite direction.

When the engine 28 is about to re-engage the clutch is activated, the pulling element 24 is allowed to move back from the position in FIG. 2 to that of FIG. 1, the cursor 31 moving along the potentiometer 36 from the end 30 towards the end 29.

If the cursor 31 reaches the end 29, this is indicated at 37A.

sent signal interpreted as stop signal for motor rotation, whereby the release path in the sense of engaging on the actual Area of use is restricted.

In the position i η of which the clutch is fully engaged is, allows the left play "J" at the reference number 23 of the anchoring of the tension member 24 on the lever 19 that this no pressure effect due to the disc spring 15 exposed is. When the thickness of the friction disc is reduced * the end 21 of the lever in Figure 1 is pushed back to the right, the permanent pressure load of the releaser increases, a force develops at the end 22 of the lever 19 which is great is enough to move the carriage 33 in spite of the friction means 35.

In Figure 3 you can see the arrangement in the state in which the friction disk 12 is worn and the clutch is in the engaged State is, whereas in Figure 4, the same arrangement is shown with the clutch disengaged. From it it follows with the described arrangement that the release travel is always limited to the actual area of use, and this regardless of the state of wear of the friction disk 12, without any special regulation being necessary.

In a variant shown in Figure 5, the arrangement is analogous to that which has been described with reference to FIGS. 1 to 4, the same reference numerals denoting denote the same elements.

In this figure, the potentiometer 36 is omitted _f the carriage 33 instead carries two electrical contacts 29 * and 30 'with which a finger 31', which is arranged on the pulling element 24, interacts. A signal 37A, 37B is assigned to each contact 29 ', 3O'.

In this case, the motor means do not consist of an electric motor 28, but of a hydraulic cylinder 28 ', the one with a distributor 40 and a hydraulic center

cooperates, which has a pump 41 and a container 42. The distributor 40 has an electric valve, of which the electric control can be seen at reference number 43. The solenoid valve 40-43 is controlled as before by electrical signals 37A, 37B for deactivation, which via a Control box 38 run, depending on the direction of control of the distributor 43.

The operation of the device according to FIG. 5 is analogous to that as has been described with reference to FIGS. 1 to 4.

As before, the release route is on its actually used one The range of use is limited, regardless of how advanced the state of wear of the friction disk 12 is.

Claims (9)

Claims ^ "^ I ^ MeB T 1. Control actuation for a friction clutch, which is returned to the engaged position by means of elastic means (15), with an actuating linkage (18,19, 24) having motor means (28,28 *), characterized in that Endsci =% lter, which are assigned to the motorized means, in order to limit its action, have an arrangement of two contact terminals (29-30, 29'-3O ¹ ) arranged at a distance from one another, between which a follower pin (31, 31 ') can be displaced and which The actuation of the motorized means is interrupted when it reaches one of the two contact terminals, and that the arrangement itself can also be displaced over a path compatible with the path of the follower pin, which is driven by a linkage to the extent that the friction or drive disk (12) is worn migrates with. Bank details: Bayer. Vereintbank Munich, Account 420 404 (BLZ 700 202 70) Potential account: Munich 27044-802 (BLZ 70010080) (only PA Dipl.-Ing.S. Slaeger) 2. Control actuator according to claim 1, characterized in that the arrangement of the two contact terminals (29-30, 29'-3O ¹ ) along a slide rail (34) is displaceable essentially parallel to the path of the follower pin (31,3I ¹ ). 3. Control actuator according to claim 2, characterized in that friction means (35) are provided between the contact terminal arrangement (29-30, 29'-3O ¹ ) and the slide rail (34). 4. Control actuator according to at least one of the claims 1 to 3, characterized in that the linkage has a lever (19) which is engaged in The state of the coupling under pressure interacts with a support (32) of the contact terminal arrangement. 5. Control actuator according to at least one of the claims 1 to 4, characterized in that the contact terminal arrangement and the stylus send out an electrical signal (37) which interrupts the actuation of the motorized means when the stylus reaches one of the two contact terminals (29-30, 29'-3O ¹ ). 6. Steuerbetägigung according to claim 5, characterized in that the contact terminal arrangement has an electrical potentiometer (36), while the stylus has a sliding contact (31), which with interacts with the potentiometer. 7. Control actuator according to claim 6, characterized in that the contact terminal arrangement ^{comprises two electrical contacts (29 ', 3O 1} ), while the stylus has a finger (31') which cooperates with the electrical contacts. 8. Control actuator according to at least one of claims 5 to 7, characterized in that that the motor means have an electric motor (28), via an electrical interruption signal (37A) is controlled. 9. Control actuator according to at least one of claims 5 to 7, characterized in that that the motor means have a hydraulic cylinder (28 *) which is operated by means of an electrovalve (40-43) which is controlled via the electrical interrupt signal (37A, 37B).