WO2017211340A1

WO2017211340A1 - Clutch device

Info

Publication number: WO2017211340A1
Application number: PCT/DE2017/100333
Authority: WO
Inventors: Ralph Schimpf; Alexander Wenisch
Original assignee: Schaeffler Technologies AG & Co. KG
Priority date: 2016-06-08
Filing date: 2017-04-25
Publication date: 2017-12-14
Also published as: DE102016210104B3

Abstract

The invention relates to a clutch device comprising an inner ring (1), an outer ring (2), and at least one clutch disk (3) which is arranged radially between the inner ring (1) and the outer ring (2) and which is made of a plurality of segments (5) that are arranged adjacently to one another in the circumferential direction and are elastically connected together by a cage (4). The segments (5) come into contact solely with the outer ring (2) when the clutch device is disengaged, and the segments (5) additionally come into contact with the inner ring (1) when the clutch device is engaged in order to generate a friction torque to transmit a torque between the inner ring (1) and the outer ring (2). The outer ring (2) has a plurality of ramps (6) on an inner circumferential surface, said ramps interacting with correspondingly designed ramps (7) on a respective outer circumferential surface of the respective segment (5), and the segments (5) can be moved radially by an axially actuatable piston (13).

Description

coupling device

The invention relates to a coupling device, in particular for a motor vehicle. Clutch devices in motor vehicles, in particular in transmissions of motor vehicles, are generally designed as multi-plate clutches or dog clutches. Multi-plate clutches are frictional coupling devices which are actuated essentially by an axial force. Jaw clutch are positive coupling devices that have a lower shifting comfort than multi-plate clutches, but require a lower actuation force.

For example, DE 10 2013 220 224 A1 discloses a shiftable clutch. The clutch includes a first outer ring, a second outer ring, an inner ring, at least one wedge block disposed at least partially radially between the inner ring and the first and second outer rings, and a single actuator rod for positioning the at least one wedge block , is displaceable. In a first position for the actuator rod and the at least one wedge block, the first outer ring and the inner ring are rotatably connected to each other. In a second position for the actuator rod and the at least one wedge block, the second outer ring and the inner ring are rotatably connected with each other. In a third position for the actuator rod and the at least one wedge block, the inner ring is rotatable relative to the first and second outer rings.

The object of the present invention is to further develop a coupling device such that in particular a shifting comfort of the coupling device is increased and an actuating force for actuating the coupling device is reduced.

The coupling device according to the invention comprises an inner ring and an outer ring and at least one radially arranged between the inner ring and the outer ring clutch disc, which is formed of a plurality of circumferentially adjacent to each other and elastically interconnected by a cage segments, wherein the segments in a unconfirmed stand the Kupplungsvornchtung come only to the outer ring to the plant, and wherein the segments in an actuated state of the coupling device also come to rest on the inner ring to generate a frictional torque for transmitting torque between the inner ring and the outer ring, wherein the outer ring on a Inner peripheral surface has a plurality of ramps, which cooperate with correspondingly formed ramps on a respective outer peripheral surface of the respective segment, and wherein the segments are radially displaceable via an axially actuated piston.

In other words, a gap is formed in the unactuated state of the coupling device between the at least one clutch disc and the inner ring, so that the inner ring and the at least one clutch disc do not come into contact with each other, wherein no torque is transmitted between the inner ring and the outer ring. In contrast, the at least one clutch disc comes in an actuated state of the coupling device radially on the inner ring and the outer ring to the plant. A radial displacement of the segments is initiated by the axial actuation of the piston and the ramps cooperating with each other on the outer ring and on the respective segment. The radial displacement of the segments leads to a wedging of the coupling disc between the outer ring and the inner ring and thus to a positive connection. In particular, this increases the shifting comfort. An outer peripheral surface of the inner ring is cylindrical.

Preferably, the piston is annular and has a plurality of axially formed wedge elements, which are arranged tangentially between each two segments in order to space the respective two segments tangentially from one another. Thus, the respective wedge element is designed such that an end of the respective wedge element formed on the annular piston is tangentially wider than a free end of the respective wedge element. The further the piston is axially displaced in the direction of the clutch disc, the further two segments are spaced from each other. The tangential displacement of the respective two segments on the outer ring, is connected to a slipping of the ramps on the outer ring and on the segments, thereby resulting in a radial displacement of the respective two segments. Preferably, the respective wedge element is arranged in each case tangentially between two segments after two successive segments in the circumferential direction. In other words, a wedge element and no wedge element are arranged alternately between two segments. Thus, the piston has half as many wedge elements as the clutch disc has segments. A wedge member is provided for actuating two segments, respectively.

According to a preferred embodiment, two respective ramps on the outer ring together substantially form a pitch circle contour. This realizes a rotation-independent wedging of the clutch disc. Furthermore, other ramp contours are conceivable that realize a rotational direction independent wedging the clutch disc. In particular, the ramps are formed on the outer ring in the circumferential direction alternately on the outer ring, wherein in each case at least one radi al increasing and each at least one radially decreasing ramp are formed alternately in the circumferential direction.

The invention includes the technical teaching that the segments are arranged in a circumferential groove on the inner ring, wherein the segments come in the actuated state of the coupling device in the circumferential groove to the plant. The circumferential groove is particularly intended to prevent tilting of the segments and to reduce the operating force for the coupling device.

Preferably, the segments are formed substantially wedge-shaped on an inner circumferential surface. In particular, the circumferential groove is formed complementary to the segments. This increases the contact surface between the respective segment and the inner ring. Consequently, the normal force and thus also the friction torque between the respective segment and the inner ring increases. The respective segment is preferably mounted radially on the cage via two spring elements in each case, with the two respective spring elements pressing the respective segment radially against the outer ring in the unactuated state of the coupling device. The spring elements are preferably designed as compression springs and are supported radially between the cage and the respective segment. Preferably, the outer ring is rotatably connected to a housing. The housing may be, for example, a transmission housing or other torque-carrying component, such as a planet carrier. In particular, a form-fitting structure is formed between the housing or this component and the outer ring, which prevents rotation of the outer ring relative to the fixed component or the housing.

In the following, an embodiment of the invention with reference to the drawings, which the same or similar elements are provided with the same reference numerals, explained in more detail. This shows

FIG. 1 is a schematic sectional view for illustrating the construction of a coupling device according to the invention;

Figure 2 is an enlarged schematic sectional view of the coupling device according to the invention according to Figure 1, and

Figure 3 is another schematic sectional view of the invention

Coupling device according to Figure 2 in an actuated state.

According to Figure 1, a coupling device according to the invention for a - not shown here - motor vehicle on an inner ring 1, an outer ring 2 and a radially disposed between the inner ring 1 and the outer ring 2 clutch disc 3. The outer ring 2 is rotatably connected to a housing 10. In particular, a positive-locking structure is formed radially between the outer ring 2 and the housing 10, which prevents a relative rotation between the outer ring 2 and the housing 10. The clutch disc 3 is formed of a plurality of circumferentially adjacent to each other and by a cage 4 interconnected segments 5.

According to FIG. 2, the respective segment 5 is mounted radially on the cage 4 via two spring elements 9 each. In a - here shown - unactuated state of the coupling device, the respective segment 5 of the two respective spring elements 9 pressed radially against the outer ring 2. Thus, the segments 5 come radially to an inner peripheral surface of the outer ring 2 to the plant. Furthermore, the outer ring 2 on the inner circumferential surface on a plurality of ramps 6, which cooperate with correspondingly formed ramps 7 on a respective outer peripheral surface of the respective segment 5, in order to influence a radial displacement of the respective segment. In this case, two respective ramps 6 on the outer ring 2 together form a pitch circle contour. In each case two segments 5 are radially displaceable via an axially actuated piston 13. For this purpose, the piston 13 is annular and has a plurality of axially formed wedge elements 14, which are arranged tangentially between two segments 5, respectively, to space the respective two segments 5 tangentially from one another during an axial actuation of the piston 13 and thereby displace it radially. The respective wedge element 14 is arranged in each case tangentially between two segments 5 after two successive segments 5 in the circumferential direction.

In an unactuated state of the coupling device, the segments 5 come only to the outer ring 2 to the plant, between the inner ring 1 and the clutch plate 3, in particular between the inner ring 1 and the segments 5, a radial gap 1 1 is formed. Thus, no torque is transmitted between the inner ring 1 and the outer ring 2. The piston 13 can be acted upon by an axial force in order to actuate the segments 5 radially. In an actuated state of the coupling device, the segments 5 also come to rest on the inner ring 1 in order to generate a frictional torque for transmitting a torque between the inner ring 1 and the outer ring 2. The reason for this is the introduced by the axial displacement of the piston 13 tangential displacement between two segments 5, due to the operatively connected ramps 6 on the outer ring 2 and the corresponding thereto formed ramps 7 on the respective segment 5 with a radial displacement of the two segments 5 goes along. In other words, in the actuated state of the coupling device, the inner ring 1 is coupled via the clutch disc 3 with the outer ring 2 and thus rotatably connected. Because of the ramps 6 on the outer ring 2 and the corresponding ramps 7 formed on the respective segment 5, after a slight relative rotation between the clutch disc 3 and the outer ring 2, a wedging of the clutch disc 3 between the outer ring 2 and the inner ring 1 takes place. ment, the friction torque for transmitting the torque between the inner ring 1 and the outer ring 2 is amplified in the actuated state of the coupling device.

In Figure 3, the coupling device according to a further sectional view is shown in the actuated state. In particular, it is apparent from Figure 3 that the held by the cage 4 segments 5 are arranged in a circumferential groove 8 on the inner ring 1. In the actuated state of the coupling device, the segments 5 come in the circumferential groove 8 to the plant. An arrow 12 visualizes an axial force acting on the piston 13 which axially displaces the respective axially formed wedge elements 14 between two segments 5 and thereby displaces the respective two

Segments 5 tangentially, and has moved radially along with it. In particular, the piston 13 is annular and has a plurality of axially formed wedge elements 14, which are arranged tangentially between two respective segments 5, to space the respective two segments 5 tangentially from each other.

Due to the radial displacement of the segment 5, the segment 5 comes radially in the groove 8 on the inner ring 1 to the plant. The segment 5 is substantially wedge-shaped on an inner circumferential surface, in particular trapezoidal in cross-section. Furthermore, the groove 8 is formed substantially complementary to the segment 5 in order to prevent tilting of the segment 5.

LIST OF REFERENCES

inner ring

outer ring

clutch disc

Cage

segments

ramp

groove

spring element

casing

gap

arrow

piston

key member

Claims

Patent claims

1 . Clutch device, comprising an inner ring (1) and an outer ring (2) and at least one clutch disk (3) arranged radially between the inner ring (1) and the outer ring (2), which consists of a plurality of clutch discs arranged adjacent to one another in the circumferential direction and through a cage (4) of elastically interconnected segments (5), wherein the segments (5) only come into contact with the outer ring (2) in an unactuated state of the coupling device, and wherein the segments (5) in an actuated state of the Coupling device also comes into contact with the inner ring (1) in order to generate a frictional torque for transmitting a torque between the inner ring (1) and the outer ring (2), the outer ring (2) having a plurality of ramps (6) on an inner circumferential surface. which interact with correspondingly designed ramps (7) on a respective outer peripheral surface of the respective segment (5), and wherein the segments (5) are radially displaceable via an axially actuable piston (13).

2. Coupling device according to claim 1,

characterized in that the piston (13) is annular and has a plurality of axially formed wedge elements (14) which are arranged tangentially between two segments (5) in order to tangentially space the respective two segments (5) from one another.

3. Coupling device according to claim 2,

characterized in that the respective wedge element (14) is arranged tangentially between two segments (5) after two successive segments (5) in the circumferential direction.

4. Coupling device according to one of the preceding claims,

characterized in that two respective ramps (6) on the outer ring (2) together essentially form a partial circle contour.

5. Coupling device according to one of the preceding claims, characterized in that the segments (5) on an inner peripheral surface

Essentially wedge-shaped.

6. Coupling device according to one of the preceding claims,

characterized in that the segments (5) are arranged in a circumferential groove (8) on the inner ring (1), the segments (5) coming into contact in the circumferential groove (8) when the coupling device is in the actuated state.

7. Coupling device according to one of the preceding claims,

characterized in that the respective segment (5) is mounted radially on the cage (4) via two spring elements (9), the two respective spring elements (9) in the unactuated state of the coupling device holding the respective segment (5) radially against the outer ring ( 2) press.

8. Coupling device according to one of the preceding claims,

characterized in that the outer ring (2) is connected to a housing (10) in a rotationally fixed manner.