DE102016221703B3 - Freewheel device and method for mounting a freewheel device - Google Patents

Abstract

The invention relates to a freewheel device for a motor vehicle, comprising an inner ring (1) and an outer ring (2) and at least one radially between the inner ring (1) and the outer ring (2) arranged clutch disc (3), which consists of a plurality of circumferentially is formed adjacent to each other and by a cage (4) interconnected segments (5), wherein the inner ring (1) on an outer peripheral surface has a plurality of ramps (6) with correspondingly formed ramps (7) on the at least one Clutch disc (5) cooperate to allow for a first rotation of the inner ring (1) a freewheeling function between the inner ring (1) and the outer ring (2) and at a second rotation of the inner ring (1), which is opposite to the first rotation, a locking function between the inner ring (1) and the outer ring (2) to allow, further wherein the cage (4) for each segment (5) has a respective Tas che (8) for receiving the respective segment (5), wherein the respective segment (5) at least a first and a second holding contour (11a, 11b), and wherein the cage (4) on the respective pocket (8) at least a retaining lug (10), wherein the at least one first retaining contour (10) for mounting the respective segment (5) in the cage (4) cooperates with the at least one retaining lug (10). The invention also relates to a method for assembling such a freewheel device.

Description

The invention relates to a freewheel device for a motor vehicle and a method for assembling this freewheel device. Furthermore, the use of the freewheel device is also conceivable in industrial applications.

From the DE 10 2008 061 077 A1 goes out a freewheel friction clutch. This comprises a flat outer ring having a round inner circumference and a round outer circumference and a flat clamping ring having an offset radius and at least one tapered clamping body forming at least part of the inner circumference of the clamping ring, and an outer periphery having a gap the clamping ring forms an interference fit with the inner circumference of the outer ring. Furthermore, the freewheel friction clutch comprises an inner ring, with a round inner edge and a flat outer flange, which forms an outer edge, wherein the outer edge is substantially round and is formed to at least one tapered ramp. The at least one ramp of the inner ring comes into contact with at least one of the tapered clamp bodies to form at least one frictional engagement point when rotated in one direction.

The object of the invention is to further develop a freewheel device for a motor vehicle, and in particular to increase the performance of the freewheel device and to improve the production and assembly.

The freewheel device according to the invention for a motor vehicle comprises an inner ring and an outer ring and at least one radially disposed between the inner ring and the outer ring clutch disc, which is formed of a plurality of circumferentially adjacent to each other and interconnected by a cage segments, wherein the inner ring on a Outer peripheral surface has a plurality of ramps which cooperate with correspondingly formed ramps on the at least one clutch disc to allow a first rotation of the inner ring a freewheeling function between the inner ring and the outer ring and a second rotation of the inner ring, opposite to the first rotation is to allow a locking function between the inner ring and the outer ring, further wherein the cage for each segment has a respective pocket for receiving the respective segment, the respective segment minde Stens having a first and a second holding contour, and wherein the cage has at least one retaining lug on the respective pocket, wherein the at least one first retaining contour cooperates for mounting the respective segment in the cage with the at least one retaining lug.

In other words, the at least one clutch disc is formed from the cage and the segments arranged on the cage. Thus, the cage is intended to receive the individual segments in the pockets and position them on the respective ramps on the inner ring, each segment having a respective ramp on the inner circumferential surface.

To mount the clutch disc, the segments are inserted into the pockets provided, wherein the retaining lug on the cage engages in the first holding contour on the respective segment. As a result, the respective segment is held during assembly in the pocket on the cage. The clutch disc is positioned on the outer ring, wherein the respective segments are displaced radially outward until the retaining lug on the cage snaps into the second retaining contour on the respective segment and thereby fixes the clutch disc radially on the outer ring.

In the freewheeling direction, the at least one clutch disc is entrained by the ramps on the inner ring almost without friction. In contrast, takes place in the reverse direction, a clamping of the clutch disc by a constructive interaction or superposition of the ramps of the inner ring with the ramps on the respective segment. In particular, the clutch disc is radially expanded by the constructive interaction of the ramps of the inner ring with the ramps on the respective segment. As a result, the segments come frictionally engaged on the outer ring to the plant. Thus, the segments jam radially between the inner ring and the outer ring, thereby coupling the inner ring to the outer ring. In the reverse direction, the inner ring and the outer ring are rotatably connected to each other via the at least one clutch disc.

Preferably, the cage is annular and provided for tangential guidance of the segments. In particular, the cage consists of a first and second ring element, wherein the two ring elements are connected to each other via webs formed axially therebetween. Tangential between two webs and axially between the two ring elements is formed in each case a pocket in which the respective segment is received. The cage can be formed both one-piece and multi-part. In particular, the cage is formed of a polymer. Furthermore, it is also conceivable to form the cage from a metal sheet or from another material, for example brass.

Preferably, an inner peripheral surface of the outer ring is cylindrical, wherein on the Inner peripheral surface of the outer ring is formed a circumferential groove for radial reception of the segments. Preferably, an outer peripheral surface of the at least one clutch disc is also cylindrical. Consequently, no ramps are formed radially between the at least one clutch disc and the outer ring. In particular, the respective segment is pressed by the cage with a slight bias in the groove. Thus, the clutch disc comes radially in the groove to the plant. Depending on the application, the width of the respective segments is variably adjustable to influence stresses in the groove on the outer ring. In particular, the ratio between the width of the respective segment and the radius in the groove base is adjusted.

According to a preferred embodiment, a ratio of an inner radius on the outer ring to an outer radius on the inner ring is at least 1.1 and at most 1.6. In other words, the quotient of the inner radius on the outer ring and the outer radius on the inner ring is at least 1.1 and at most 1.6. As a result, in particular the tilt angle of the segments is optimized during locking, whereby the performance of the freewheel device is increased.

Preferably, the at least one clutch disc has at least four and at most fourteen segments. The fewer segments the clutch disc has, the larger the contact surface between the respective segment and the ramp and between the respective segment and the outer ring.

Further preferably, the cage is symmetrical and has an even number of pockets. In particular, the cage is produced by injection molding from a polymer. The symmetrical design of the cage improves in particular the production of the cage by injection molding, since a uniform filling of the injection mold is possible. An even number of pockets means that the cage has in particular four, six, eight or ten pockets.

Preferably, the respective ramp on the outer peripheral surface of the inner ring at least partially on a profile of a logarithmic spiral. In other words, a radius of the respective ramp on the outer peripheral surface of the inner ring grows in proportion to the arc or spiral length. Further, the ramp may also be formed linear or curved or based on another mathematical function.

Preferably, the cage has a plurality of radially formed guide elements, wherein the respective guide element is provided to come tangentially to the respective ramp on the outer peripheral surface of the inner ring during the first rotation of the inner ring to rest. Thus, during the first rotation of the inner ring, the cage and thereby also the entire clutch disc are dragged along the outer peripheral surface of the inner ring via the ramp cooperating with the respective guide element in order to realize a freewheeling function.

According to a preferred embodiment, the cage has a respective recess in the immediate vicinity of the respective guide element. In other words, the respective recess is arranged axially, radially or tangentially adjacent to the respective guide element. The recess is intended to improve the flow behavior of the material to form the respective guide element on the cage during the production by injection molding. In this case, the recess may be formed continuously from one surface to the other surface of the cage or at least partially penetrate into the surface of the cage.

• 1 eine schematische Stirnseitendarstellung zur Veranschaulichung des Aufbaus einer erfindungsgemäßen Freilaufvorrichtung,
• 2 eine schematische Schnittdarstellung der erfindungsgemäßen Freilaufvorrichtung gemäß 1,
• 3 eine schematische Detaildarstellung der erfindungsgemäßen Freilaufvorrichtung gemäß 1, und
• 4 eine schematische Detaildarstellung der erfindungsgemäßen Freilaufvorrichtung gemäß 3.

Further measures improving the invention will be described in more detail below together with the description of a preferred embodiment of the invention with reference to the four figures. This shows

• 1 a schematic front side view to illustrate the structure of a freewheel device according to the invention,
• 2 a schematic sectional view of the freewheel device according to the invention 1 .
• 3 a schematic detail of the inventive freewheel device according to 1 , and
• 4 a schematic detail of the inventive freewheel device according to 3 ,

According to 1 has a freewheel device according to the invention for a - not shown here - motor vehicle an inner ring 1 and an outer ring 2 and a radially between the inner ring 1 and the outer ring 2 arranged clutch disc 3 on. The clutch disc 3 is made of eight circumferentially adjacent to each other and arranged by a Ka 4 interconnected segments 5 educated. The Ka 4 is annular and for axial reception and tangential guidance of the segments 5 intended. Furthermore, the inner ring 1 on an outer peripheral surface a plurality of ramps 6 on, with a respective ramp 6 on the outer peripheral surface of the inner ring 1 with a respective corresponding thereto trained ramp 7 at a respective segment 5 the clutch disc 3 interacts. The respective ramp 6 on the outer peripheral surface of the inner ring 1 has the profile of a logarithmic spiral. Consequently, also indicates the respective ramp 7 on the clutch disc 3 the profile of a logarithmic spiral, but complementary to the ramp 6 on the outer peripheral surface of the inner ring 1 is trained.

Furthermore, the Ka 4 a plurality of radially formed guide elements 13 on, with the respective guide element 13 is provided at the first rotation of the inner ring 1 tangential to the respective ramp 6 on the outer peripheral surface of the inner ring 1 to come to the plant. This allows a towed the clutch disc 3 at the first rotation of the inner ring 1 and thus the freewheeling function of the freewheel device. Thus, at the first rotation of the inner ring 1 the freewheel function between the inner ring 1 and the outer ring 2 allows. The first rotation is in this case a rotation of the inner ring 1 clockwise. In contrast, in a second rotation of the inner ring 1 , which is opposite to the first rotation, a blocking function between the inner ring 1 and the outer ring 2 allows. Thus, the second rotation is a rotation of the inner ring 1 counterclockwise. When the lock function of the freewheel device, the ramps run 6 on the outer peripheral surface of the inner ring 1 on the ramps 7 on the clutch disc 3 too, so that the diameter of the clutch disc 3 is enlarged. It comes to a jamming of the clutch disc 3 radially between the inner ring 1 and the outer ring 2 , In particular, every segment is jammed 5 the clutch disc 3 radially between the inner ring 1 and the outer ring 2 , so that at the second rotation of the inner ring 1 over the clutch disc 3 a torque between the inner ring 1 and the outer ring 2 is transmitted. A ratio of an inner radius 12a on the outer ring 2 to an outside radius 12b on the inner ring 1 is 1.3.

2 shows a sectional view of the freewheel device according to the invention. An inner peripheral surface of the outer ring 2 is cylindrical, wherein on the inner peripheral surface of the outer ring 2 a circumferential groove 9 for radial reception of the segments 5 is trained. The segments 5 are in the pockets 8th at the Ka 4 added. Here are the segments 5 between the inner ring 1 and the outer ring 2 jammed. The Ka 4 is symmetrical and has an even number, namely eight pockets 8th on.

To 3 the Ka 4 in the immediate vicinity of the respective guide element 13 a respective recess 14 on. The respective recess 14 is offset radially outward from the respective guide element 13 educated. Furthermore, the respective recess penetrates 14 frontally in the Ka 4 one. The ramps 6 on the inner ring 1 work constructively with the ramps 7 at the respective segment 5 together, to jamming the respective segment 5 between outer ring 2 and inner ring 1 to effect.

In 4 is the tangential connection between the Ka 4 and the segment 5 shown. The segment 5 has a first and a second holding contour 11a . 11b on. In contrast, the Ka 4 a holding nose 10 on. The first holding contour 11a is for mounting the segment 5 in the kitchen 4 intended. Furthermore, the second holding contour 11b for positioning the segment on the outer ring 2 intended.

When mounting the freewheel device is first the respective segment 5 in the respective bag 8th at the Ka 4 inserted, with the respective retaining lug 10 at the Ka 4 in the first holding contour 11a at the respective segment 5 attacks to the respective segment 5 at the Ka 4 to fix. After that, the respective segment 5 in the respective bag 8th moved radially outwards, with the respective retaining lug 10 at the Ka 4 in the second holding contour 11b at the respective segment 5 attacks to the respective segment 5 on the outer ring 2 to position. In particular, on both sides in the tangential direction on the respective segment 5 a respective holding contour 11a . 11b formed, and thus both tangential surfaces of a respective pocket 8th a respective retaining lug 10 exhibit.

LIST OF REFERENCE NUMBERS

1

inner ring

2

outer ring

3

clutch disc

4

Cage

5

segment

6

Ramp on the inner ring

7

Ramp on the segment

8th

Bags

9

groove

10

retaining nose

11a, 11b

retaining contour

12a

Inner radius on the outer ring

12b

Outer radius on the inner ring

13

guide element

14

recess

Claims (10)

Freewheel device for a motor vehicle, comprising an inner ring (1) and an outer ring (2) and at least one radially between the inner ring (1) and the outer ring (2) arranged clutch disc (3), of a plurality of circumferentially adjacent to each other and arranged formed by a cage (4) interconnected segments (5), wherein the inner ring (1) on an outer peripheral surface has a plurality of ramps (6) with correspondingly formed ramps (7) on the at least one clutch disc (5) cooperate to allow for a first rotation of the inner ring (1) a freewheeling function between the inner ring (1) and the outer ring (2) and a second rotation of the inner ring (1), which is opposite to the first rotation, a blocking function between the Inner ring (1) and the outer ring (2) to allow, further wherein the cage (4) for each segment (5) has a respective pocket (8) for receiving the jew in which the respective segment (5) has at least one first and one second retaining contour (11a, 11b), and wherein the cage (4) has at least one retaining lug (10) on the respective pocket (8), wherein the at least one first retaining contour (10) for assembling the respective segment (5) in the cage (4) cooperates with the at least one retaining lug (10). Freewheel device after Claim 1 , characterized in that the cage (4) is annular and is provided for tangential guidance of the segments (5). Freewheel device according to one of the preceding claims, characterized in that an inner peripheral surface of the outer ring (2) is cylindrical, wherein on the inner peripheral surface of the outer ring (2) has a circumferential groove (9) for radial reception of the segments (5). Freewheel device according to one of the preceding claims, characterized in that a ratio of an inner radius (12a) on the outer ring (2) to an outer radius (12b) on the inner ring (1) is at least 1.1 and at most 1.6. Freewheel device according to one of the preceding claims, characterized in that the at least one clutch disc (3) has at least four and at most fourteen segments (5). Freewheel device according to one of the preceding claims, characterized in that the cage (4) is symmetrical and has an even number of pockets (8). Freewheel device according to one of the preceding claims, characterized in that the respective ramp (6) on the outer peripheral surface of the inner ring (1) at least partially has a profile of a logarithmic spiral. Freewheel device according to one of the preceding claims, characterized in that the cage (4) has a plurality of radially formed guide elements (13), wherein the respective guide element (13) is provided, during the first rotation of the inner ring (1) tangentially to the respective ramp (6) to come to rest on the outer peripheral surface of the inner ring (1). Freewheel device after Claim 8 , characterized in that the cage (4) in the immediate vicinity of the respective guide element (13) has a respective recess (14). Method for mounting a freewheel device according to one of the preceding claims, characterized in that the respective segment (5) is first inserted into the respective pocket (8) on the cage (4), wherein the respective retaining lug (10) on the cage (4) in the first retaining contour (11a) on the respective segment (5) engages in order to fix the respective segment (5) to the cage (4), and thereafter the respective segment (5) is displaced radially in the respective pocket (8), wherein the respective retaining lug (10) on the cage (4) in the second retaining contour (11b) on the respective segment (5) engages to position the respective segment (5) on the outer ring (2).

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