DE102016217053B4 - Actuator for a wedge and / or multi-plate clutch - Google Patents

Abstract

Actuator for actuating a clutch for locking and / or releasing a loose wheel on a transmission shaft of a gearbox, wherein the actuator (11) has a rotatably mounted shift sleeve (12) and a Rampenaktuator (13), wherein the Rampenaktuator (13) between the shift sleeve ( 12) and the clutch (4) on the transmission shaft (1) is arranged, wherein the shift sleeve (12) on the outer circumference of its cylindrical housing has a switching contour (28) which is in engagement with a switching contour of an annular slide (29), characterized in that the switching contour (28) has a switching edge (28.1), which is arranged to the circumferential direction of the sliding sleeve (12) in a helix angle (α).

Description

The invention relates to an actuator for actuating a wedge and / or multi-plate clutch, in particular for coupling a loose wheel with a transmission shaft of a gearbox.

It is known to provide a wedge coupling for coupling a loose wheel to a transmission shaft, which is operable in the axial direction of the transmission shaft and a radial ramp contour undergoes an increase in diameter, which leads to a setting of the idler gear on the transmission shaft, so that a torque transmission between the transmission shaft and the idler gear is enabled.

By the prior art according to US 2014/00 144 55 A1, for example, a wedge coupling in particular a one-way wedge coupling (freewheel) for a loose wheel is known, with an inner ring, an outer ring and a wedge disk arranged between the inner ring and outer ring for fixing the Outer ring opposite the inner ring in one direction. For this purpose, the inner ring has a number of evenly distributed on its outer circumference arranged ramps, which are arranged cooperatively with a corresponding number of ramps on the inner circumference of the wedge disk. The wedge disk is surrounded on its outer circumference by the outer ring coaxially spaced. In a first direction of rotation of the inner ring this takes with the wedge disk, without deforming them, whereby the outer ring is freely rotatably mounted relative to the transmission shaft. In an opposite second direction of rotation, the wedge disk is deformed over the slope of the ramps and pushed outwardly, so that the outer diameter of the wedge disk is increased and the outer ring clamps.

WO 2014/193 671 A1 shows a planetary gear with a friction clutch, in particular a multi-plate clutch for switchable connection of a rotatable Au-ßenträgers with a rotatable inner support, wherein in addition to the friction clutch, a one-way wedge coupling is arranged as a bypass connected in parallel. In this way, the one-way splined coupling can transmit a torque, in particular a braking torque, when the multi-plate clutch is opened. To operate the clutch, a decentralized piston unit is provided.

DE 10 2004 015 569 A1 shows a generic actuator for actuating a clutch. By means of an outer and an inner sliding sleeve are rotated over balls ramp body. DE 70 25 617 U shows another actuator for clutch actuation.

The invention has for its object to provide a further actuator for the axial actuation of a wedge and / or multi-plate clutch.

The object is achieved by the features of claim 1. The actuator according to the invention advantageously has a ramp actuator which generates an axial force required for switching the clutch.

The Rampenaktuator has two axially against each other rotatable and axially displaceable pressure plates with a wedge-shaped raceway for rolling elements, eg. As cylinder or balls, so that a rotational movement of a thrust washer relative to the other generates an axial displacement of the two pressure discs against each other.

In an advantageous embodiment of the ramp actuator between a cylindrical shift sleeve and the clutch is arranged on a transmission shaft of a gearbox, wherein the clutch, the shift sleeve and the Rampenaktuator the transmission shaft coaxially.

A first thrust washer forms a bottom for the cylindrical sliding sleeve and is positively connected thereto. The shift sleeve surrounds by means of its housing a plate spring, which is fixed to a fixed to the inner ring of the transmission shaft stop, z. B. is supported a circlip, such as a thrust bearing, which is separated by a pressure washer of the diaphragm spring. By this measure, the shift sleeve is mounted axially resilient together with the Rampenaktuator and the clutch in a "floating storage" on the transmission shaft.

By an advantageous arrangement of the thrust bearing between the pressure plates of the shift sleeve this is charged only during a switching operation, whereby a power loss minimized and the service life of the thrust bearing is increased.

In order to rotate the shift sleeve for switching the clutch and thus for fixing a loose wheel on the transmission shaft, the cylindrical housing of the shift sleeve on its outer circumference on a switching contour corresponding to a switching contour of an annular slide.

The switching contour has at least one in the circumferential direction of the shift sleeve in a helix angle α arranged switching edge, z. For example, an oblique cam or a helical toothing, so that a circumferential rotation of the shift sleeve is generated from an axial movement of the slider.

• 1 a einen Aktuator in perspektivischer Darstellung in ungeschaltetem Zustand.
• 1 b den Aktuator in perspektivischer Darstellung in geschaltetem Zustand.
• 2 a den Aktuator im Schnitt in ungeschaltetem Zustand.
• 2 b den Aktuator im Schnitt in geschalteten Zustand.
• 3 a einen Rampenaktuator im Schnitt in schematischer Darstellung.
• 3 b den Rampenaktuator in einer Explosionszeichnung.

Further advantageous embodiments are described in the subclaims. One Embodiment of the invention is illustrated in the drawings and will be described below. Show it

• 1 a an actuator in perspective view in the unswitched state.
• 1 b the actuator in perspective view in the switched state.
• 2 a the actuator on average in the unswitched state.
• 2 B the actuator in the cut state in the cut.
• 3 a a ramp actuator in section in a schematic representation.
• 3 b the ramp actuator in an exploded view.

A gear shaft 1 , z. B. An input or output shaft of a gearbox has shown in FIG. 2a and 2 B a loose wheel 2 on which by means of a loose wheel bearing 3 freely rotatable on the gear shaft 1 is arranged. For fixing the loose wheel 2 on the gear shaft 1 for torque transmission between the gear shaft 1 and the idler wheel 2 is a clutch 4 provided, which in an axial application of force clamping and setting the idler gear 2 on the gear shaft 1 causes.

The coupling 4 is designed as a wedge and / or multi-plate clutch, wherein a clutch pack consisting of a number, z. B. four fins 6 is provided which in the axial direction alternately in frictional contact with eg four wedge discs 7 the clutch 4 stand. The slats 6 are non-rotatable on an inner ring 8th attached, which in turn rotatably by means of a toothing on the transmission shaft 1 is arranged.

The wedges 7 have projections on their outer circumference 7.1 on, which for torque transmission in groove-shaped receptacles 9 in idler gear 2 interlock positively. The clutch pack is limited on the one hand by a stop plate 14, which is integral with the inner ring 8th is connected and has on the other side an axially displaceable pressure washer 16 on, the part of the ramp actuator 13 is.

For actuating the clutch 4 is an actuator 11 provided, which is a cylindrical sliding sleeve 12 and a ramp actuator 13 having. The ramp actuator 13 is, in the axial direction of the gear shaft 1 seen, between the shift sleeve 12 and the clutch 4 arranged, with the sliding sleeve 12 , the ramp actuator 13 and the clutch 4 the transmission shaft 1 Coaxially comprising on the inner ring 8th are arranged in a "floating storage".

The ramp actuator 13 according to 3 a and 3 b essentially two mutually rotatably arranged pressure discs 16 . 17 on, on their respective facing sides axial ramp contours 18 , z. B. have four ramp contours. In the ramp contours 18 are rolling elements, eg balls 19 guided. The balls 19 have an annular spacer 21 on.

The pressure disc 17 is fixed to the cylindrical sliding sleeve 12 connected, in their cylinder housing a thrust bearing 22 receives, which axially on the pressure plate 17 and on another thrust washer 23 is supported, in operative contact with a plate spring 24 stands. An attack 26 , z. B. in the form of a retaining ring is on the inner ring 8th arranged and serves as an abutment for the diaphragm spring 26 ,

The sliding sleeve 12 has on its outer circumference a switching contour 28 on that with a switching contour 28 an axially slidably disposed, annular slide 29 is engaged. The switching contour 28 has an oblique to the circumferential direction of the shift sleeve 12 arranged switching edge 28.1 on. The switching contour 28 can z. B. be formed as a helical or oblique cam.

The switching edge 28.1 has a helix angle α ( α = z. B. 45 degrees), which consists of an axial displacement of the annular slide 29 a rotation of the shift sleeve 12 causes. The axial displacement of the slider 29 For example, it may be initiated by a conventional shift fork (not shown).

By the rotation of the shift sleeve 12 the balls are running 19 arranged in the pressure plates 16,17 Rampenkonturen 18 high and thereby cause an increase in the distance of the pressure discs 16 . 17 , By this measure, the plate spring 24 biased, so over the pressure plate 16 the clutch pack is subjected to an axial force, which is used to switch the clutch 4 leads and the idler gear 2 to the gear shaft 1 coupled.

A displacement of the annular slide 29 in the opposite direction leads to the rotation of the sliding sleeve 12 back to the starting position and thus to run down the balls 19 on the ramp contour 18 , By this measure, the pressure discs move 16 . 17 towards each other and relieve the clutch pack, causing the idler gear 2 opposite the drive shaft 1 is solved.

LIST OF REFERENCE NUMBERS

1

gear shaft

2

Losrad

3

Losradlager

4

clutch

5

6

lamella

7

wedge disk

7.1

head Start

8th

inner ring

9

Receiving groove ( 2 )

10

11

actuator

12

shift sleeve

13

Rampenaktuator

14

Stop disc ( 8th )

15

16

Thrust washer ( 13 )

17

Thrust washer ( 13 )

18

Ramp contour (16,17)

19

Rolling element ( 13 )

20

21

Spacers ( 19 )

22

thrust

23

Thrust washer ( 12 )

24

Disc spring ( 12 )

25

26

circlip

27

28

switching contour

28.1

switching edge

29

pusher

α

Helix angle ( 28.1 )

Claims (8)

Actuator for actuating a clutch for locking and / or releasing a loose wheel on a transmission shaft of a gearbox, wherein the actuator (11) has a rotatably mounted shift sleeve (12) and a Rampenaktuator (13), wherein the Rampenaktuator (13) between the shift sleeve ( 12) and the clutch (4) on the transmission shaft (1) is arranged, wherein the shift sleeve (12) on the outer circumference of its cylindrical housing has a switching contour (28) which is in engagement with a switching contour of an annular slide (29), characterized in that the switching contour (28) has a switching edge (28.1), which is arranged to the circumferential direction of the sliding sleeve (12) in a helix angle (α). Actuator after Claim 1 , characterized in that the shift sleeve (12) has a cylindrical housing which comprises the transmission shaft (1) coaxially. Actuator after Claim 2 , characterized in that the shift sleeve (12) has a thrust washer (17) which is part of the Rampenaktuators (13). Actuator after Claim 3 , characterized in that the shift sleeve (12) has a further pressure disc (23) and that between the pressure discs (17, 23), a thrust bearing (22) is arranged. Actuator according to one of the preceding claims, characterized in that the Rampenaktuator (13) by means of a pressure plate (16), with a clutch pack of the clutch (4) consisting of lamellar and / or wedge discs (6, 7) is in operative contact. Actuator after Claim 5 , characterized in that the pressure discs (16, 17) axial ramp contours (18), in which rolling elements (19) are arranged. Actuator after Claim 5 or 6 , characterized in that the clutch pack (6, 7) by a stop disc (14) of an inner ring (8) is arranged axially limited. Actuator according to one of the preceding claims, characterized in that the shift sleeve (12), the Rampenaktuator (13) and the clutch (4) by means of a plate spring (24) in a floating bearing on the transmission shaft (1) are arranged.

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