KR20090121223A - Lever actuator - Google Patents

Abstract

PURPOSE: A lever actuator is provided to support a rolling unit in a base plate and arrange spins to restrictively rotate around a base plate, thereby preventing a large bearing load and loads of spins. CONSTITUTION: A lever actuator(1) comprises a lever(11). A turning point(13) of the lever is formed by a rolling unit(14). The rolling unit moves along with a horizontal direction of the lever by spins(18) rotated by a driver. The rolling unit supports a base plate(16). The spins are restrictively rotated around the base plate.

Description

Lever Actuator {LEVER ACTUATOR}

The present invention relates to a lever actuator for the operation of the friction clutch.

General lever actuators are known from German publication DE 10 2007 027 175 A1. To operate the friction clutch, one side of the lever is acted by one or more energy reservoirs, and the rolling unit between the energy reservoir and the lever end moves along the longitudinal direction of the lever by means of a spindle driven actuator. An axial movement of the tip is caused, in which case the rolling unit is supported on the base plate on the one hand and forms a lever turning point for the lever on the other hand. The spindle is axially centered on the base plate and is supported axially by a spindle force acting in the direction of the driver.

The object of the present invention is to improve the lever actuator of this type, in particular in terms of functionality and fatigue strength.

The object of the present invention is achieved by a lever actuator with a lever which exerts a varying operating force for the operation of the friction clutch and which can be acted upon by an energy reservoir, in particular a lever actuator for the operation of the friction clutch, in which case the The lever rotation point is formed by a rolling unit which is movable along the longitudinal direction of the lever by a spindle rotating by the driver, the rolling unit being supported on the base plate against the action of the energy reservoir and the spindle relative to the base plate. It is arranged to be limitedly pivoted. This arrangement prevents the spindle from being forcibly pressed against the base plate. With this pivotable arrangement, not only is the mechanical design of excessive dimensions compared to the case where the spindle is fixedly rotatable to the base plate, which may be the wall of the transmission, but also the high bearing load of the bearing between the base plate and the spindle and The load on the spindle can also be prevented. For example, part tolerances and manufacturing tolerances can prevent the rolling unit from lifting from the base plate, the spindle unevenly rotated, and the like. This can improve the quality of the lever connection as a whole, in particular the functionality and fatigue strength.

The spindle may pivot about the plane of the axial support of the spindle relative to the base plate. It is required that the lever actuator be supported on the base plate as described above by the spindle force depending on the restoring force of the friction clutch, the clutch force and the like. Correspondingly, the base plate is understood as an energy storage device for acting on the lever, for example, and a device in which the lever actuator parts, such as the lever itself and the rolling unit, are fixed to the housing to form the construction unit. Alternatively, for example, the transmission wall can be used as the base plate in which the parts of the lever actuator mentioned are accommodated, if no separate construction unit is required.

Preferably the axial support is a thrust bearing which allows the spindle to be supported by the rolling bearing in the base plate, which can be pivotally limited but can be held fixed axially. To this end the thrust bearing can be accommodated in the base plate with play. For example, a bearing ring of a thrust bearing may be elastically received in the base plate at one or more, for example two or three, bearing points distributed along the circumference, the bearing point causing the bearing ring to pivot limitedly. In this case, the thrust bearing may be prestressed eccentrically against the spindle force acting in the direction of the actuator.

The spindle may be tensioned with the base plate, in particular in a thrust bearing, such that the rolling unit is prestressed by the spindle against the base plate. In this case the prestress is preferably set such that the lifting point of the rolling unit is prevented in particular before assembly of the lever actuator. If the thrust bearing is mounted as a single bearing, the thrust bearing can be arranged radially opposite to the support point of the rolling unit in relation to the axis of rotation of the spindle. In this case the axial prestress may have an introduction point radially opposite to the introduction point of the force of the rolling unit into the base plate with respect to the axis of rotation of the spindle.

The invention is explained in more detail by the embodiment with the associated figures FIGS. 1 to 5.

According to the invention, the lever rotation point of the lever actuator for the operation of the friction clutch is formed by the rolling unit, in which case the rolling unit is supported on the base plate against the action of the energy reservoir and the spindle is limited to the base plate. By being pivotally arranged, not only excessively dimensioned mechanical designs but also high bearing loads of the bearings between the base plate and the spindle and the loads of the spindles can be prevented.

1 shows a lever actuator 1 for operating the actuating device 2 for the friction clutch 3. Only the parts of the friction clutch 3 are shown here which are necessary for understanding the manner of operation. The friction clutch 3 comprises a clutch disk 5 rotatably connected to a transmission input shaft not shown here, a pressure plate 6 and a corresponding pressure plate 7 rotatably connected to a crankshaft of an internal combustion engine not shown here. ). When the friction clutch 3 is in the connected state, the pressure plate 6 and the corresponding pressure plate 7 are tensioned together with the clutch disc 5, so that a friction-coupled connection is made between them so that the torque of the crankshaft is transmitted to the transmission input shaft. Can be delivered. When the friction clutch is in the separated state, the pressure plate 6 and the corresponding pressure plate 7 are not frictionally engaged with the clutch disk 5.

The pressure plate 6 is frictionally engaged with the clutch disc 5 because it moves in the direction of the corresponding pressure plate 7 by a lever spring or a leaf spring 8 supported on the clutch cover 9. In this case, the state in which the friction clutch is closed and the state in which the friction clutch is closed differs from the state in which the friction clutch 3 is closed under pressure and opens under pressure as shown in FIG. The friction clutch is opened opposite to the action of the leaf spring. The leaf spring 8 may be an engagement bearing or a release bearing depending on the implementation of the friction clutch and is operated by an actuating bearing 10 actuated by the lever actuator 1. The lever actuator 1 has a first end side A connected to a bearing ring of the actuating bearing 10 and a second end side C fixed radially to the housing side bearing 12 and with an energy store ( Contrary to the action of 4), it comprises here a lever 11 arranged axially displaceable in the housing side bearing 12 in the form of two springs. The lever 11 is supported by a rotation point 13 which is movable between the housing side bearing 12 and the actuating bearing 10, which rotation point forms a support point B and, for example, in the form of a rolling unit 14. It can be a rotation point that can be implemented. The force exerted on the lever 11 from the actuating bearing 10 and the energy accumulator 4 is always in equilibrium according to known lever regulations, in which case the lever length is on the one hand the actuating bearing for the turning point 13 ( It is determined by the spacing of 10 and, on the other hand, by the spacing of the housing side bearing 12 with respect to the rotation point 13 and thus by the position of the rotation point 13. The bearing inner ring of the actuating bearing 10 includes two centering pivots which engage the corresponding jaws of the lever. The lever 11 is arranged in the actuating bearing 10 so that it can penetrate the transmission input shaft and the actuators can be offset from one another about the transmission input shaft when two lever actuators are used for one double clutch. It is cut in the area.

The rolling unit 14 is used as an axial support for the base plate 16 and at least one rolling unit 14 used to roll on the base plate when the rolling unit moves along the longitudinal direction of the lever 11. Roller 15. One or more rollers 17 are also provided which are independent of the rollers 15 and which are used to support the levers against the rolling units 14. The rollers 15, 17 are housed in a roller support 24 belonging to the rolling unit 14, which roller spindle is driven by a driver such as an electric motor, with a spindle 18 which can be a threaded spindle or a recirculating ball spindle. An axial screw for converting the rotational drive of 18 into the longitudinal motion of the rolling unit 14 is formed.

In figure 2 the release lever 1 is shown simply horizontally as compared to figure 1. In order to be able to provide the clutch path W on the end side A of the lever 1, a force corresponding to the clutch actuation force P must be generated on the end side A. FIG. For this purpose the end side B of the lever 11 is prestressed by the energy store 4 at the housing side and the lever rotation point of the lever 11 is moved. This movement of the lever rotation point is effected by the rolling unit 14 which is moved radially, ie in the longitudinal direction of the lever 11, by the electric motor 19 and by the spindle 18 driven by the motor. do. The rolling unit 14 is in this case supported by the rollers 15, 17 (see FIG. 1) on the one hand on the base plate 16 and on the other hand levers adapted to the clutch actuation force P of the friction clutch ( 11) is supported on the profile 27. In order to prevent the spindle force S acting in the direction of the electric motor 19, the spindle 18 is supported by the housing side thrust bearing 20. The thrust bearing 20 may be arranged in the base plate 16, for example in an angled flange 21 (see FIG. 3) or in another part fixed to the housing.

Due to tolerances such as part tolerances or manufacturing tolerances, the rollers are also offset by the rotation of the electric motor 19 between the spindle 18 in the base plate 16, for example with respect to the axis of rotation of the spindle 18. Since the spindle 18 can be forcibly pressed by the part tolerance between the 15 and 17 and the base plate 16, the friction of the lever actuator 1 may rise, causing wear and malfunction. Thus, in order to prevent the spindle 18 from being forcibly pressed, the spindle 18 is arranged so that it can pivot at least slightly relative to the base plate 16. To this end, the thrust bearing 20 may be pivotally disposed on the base plate 16. For example, the outer ring of the thrust bearing 20 may be elastically supported so that the thrust bearing 20 may pivot slightly within the receptacle of the base plate 16. The elastic support is damped so that bearing impact does not occur. Particularly preferably the thrust bearing 20 may be prestressed with respect to the turning angle. To this end, the thrust bearing 20 may be exerted with a force eccentrically disposed with respect to the axis of rotation 22 of the spindle. To this end, the spindle force S is offset by the compensation force K acting eccentrically with respect to the axis of rotation 22 of the spindle 18. The compensating force K can be implemented for installing a thrust bearing on the base plate, for example by correspondingly designing parts such as support parts.

3 schematically shows a variant of a lever actuator 1 having a spindle 18 driven by an electric motor 19 and supported by a base bearing 16 by a thrust bearing 20. The thrust bearing 20 has a bracket 28 such that the housing side support point or force introduction point 23 is disposed radially opposite to the force support point 29 of the roller 15 with respect to the axis of rotation 22 of the spindle 18. By the flange 21 of the base plate 16. The spindle 18 is thus prestressed in the direction of the roller 15. However, the fact that the spindle 18 is accommodated in the base plate 16 is not excessively unnecessary.

4 shows the possible functional principle of the lever actuator 1 of FIG. 3. The lever actuator 1 shows a spindle 18 which is connected to the rotor of the electric motor 19, which spindle has rollers 15, 17 rolling on the lever 11 and the base plate 16. One rolling unit 14 is driven. In this figure the thrust bearing 20 is connected to the spindle 18 by an inner ring 31 and to the base plate 16 by an outer ring 30. At the force introduction point 23 the compensating force K acts at a distance d from the axis of rotation 22 of the spindle, so that the thrust bearing 20 is torqued around the support point and the roller 15 is subjected to prestress. The base plate 16 is in contact with the base plate 16.

5 shows a preferred bracket 28 for receiving a not shown thrust bearing in the base plate 16. The bracket 28 accommodates the thrust bearing 20 on the wide side 32, for example the outer ring 30 of the thrust bearing, and is centered on the axis of rotation 34 of the bracket at the height of the axis of rotation 22 of the spindle. The bracket 28 includes two arms 33 which are used to pivot. The bracket 28 is acted upon by the compensating force K (FIG. 4) at a distance d with respect to the rotation shafts 22, 34.

1 shows schematically a lever actuator.

2 is a cross-sectional view of the lever actuator shown in comparison with FIG.

3 is a sectional view of a lever actuator having a spindle bearing.

4 shows a thrust bearing of the spindle.

5 shows a bearing bracket of a thrust bearing of the spindle.

<Explanation of symbols for the main parts of the drawings>

1: Lever Actuator

2: working device

3: friction clutch

4: energy saver

5: clutch disc

6: pressure plate

7: pressure plate

8: leaf spring

9: clutch cover

10: working bearing

11: lever

12: bearing

13: rotation point

14: rolling unit

15: roller

16: base plate

17: roller

18: spindle

19: electric motor

20: thrust bearing

21: flange

22: rotating shaft

23: force introduction point

24: roller support

26: receiving tank

27: profile

28: bracket

29: force support

30: outer ring

31: inner ring

32: wide side

33: cancer

34: rotation axis

A: end side

B: support point

C: end side

D: spacing

K: Compensation

P: Clutch actuation force

S: spindle force

W: Clutch Path

Claims (9)

A lever actuator 1 for the operation of the friction clutch 3, in particular with a lever 11 which exerts a varying operating force for the operation of the friction clutch 3 and which can be acted upon by the energy store 4. In this case, the rotation point 13 of the lever 11 is formed by a rolling unit 14 which is movable along the longitudinal direction of the lever 11 by a spindle 18 which is rotated by a driver and the rolling unit is energized. In the lever actuator 1 supported by the base plate 16 against the action of the reservoir 4, Lever actuator (1), characterized in that the spindle (18) is arranged to be pivotally limited with respect to the base plate (16). The lever actuator (1) according to claim 1, characterized in that the pivoting of the spindle is carried out about the plane of the axial support of the spindle (18) with respect to the base plate (16). The lever actuator (1) according to claim 2, wherein the axial support is a thrust bearing (20). 4. The lever actuator (1) according to claim 3, characterized in that the thrust bearing (20) is received with a play in the base plate (16). 4. The lever actuator (1) according to claim 2 or 3, characterized in that the thrust bearing (20) is prestressed eccentrically against the spindle force (S) acting in the direction of the driver. The lever actuator (1) according to any one of the preceding claims, wherein the rolling unit (14) is prestressed against the base plate (16) by the spindle (18). The force introduction point (10) according to claim 6, wherein the axial prestress is radially opposed to the force support point (29) of the rolling unit (14) into the base plate (16) with respect to the axis of rotation (22) of the spindle. Lever actuator (1), characterized in that it has 23). 8. The lever actuator (1) according to claim 7, wherein the thrust bearing (20) is pivotally mounted on a bracket (28) received in the base plate (16). 9. The lever according to claim 8, wherein the bracket (28) is subjected to the action of the compensation force (K) opposed to the spindle force (S) at a predetermined distance (d) from the axis of rotation (34) of the bracket. Actuator (1).

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