Flywheel device having sliding shoe and cage guided on sliding shoe

Abstract

The invention relates to a flywheel device (1, 20) formed from a flywheel ring (2), cages (3, 24), clamping elements (4) and springs (5), sliding shoes (7) being oriented on the flywheel ring (2) and clamping ramps (6) being oriented between two adjacent sliding shoes (9), in each case one sliding shoe (7) being received in one of the cages (9), and in each case one clamping element (4) being received in the other cage (3, 24). Wherein the retainers (3, 24) are guided on both sides (11, 12) of the respective sliding shoe (9), and wherein at least one of the retainers (9) is provided with two projections (13, 14, 25, 26), the invention relates to a sliding shoe (9) having two projections (11, 12) which are arranged axially adjacent to each other, parallel to the axial direction of the flywheel axis (10) and together project from the cage (3, 24) into the holder (9) in the direction of one of the sides (11, 12) of the respective sliding shoe (9).

Description

Technical Field

[0001] The invention relates to a flywheel arrangement formed by a flywheel ring, a cage, a clamping element and a spring, wherein an arrangement of the flywheel ring and the cage concentrically to one another on an axially oriented flywheel axis is provided, and wherein:

[0002] - sliding shoes are oriented on the flywheel ring and clamping ramps are oriented between two adjacent sliding shoes,

[0003] - the cage is guided on the sliding shoe in a tangential direction about the flywheel axis and has a recess and a retaining portion,

[0004] at least one of the clamping elements and at least one of the springs are received in one of the recesses,

[0005] -One of the sliding shoes is received in one of the retaining parts, wherein the retaining frame is guided on two side faces of the corresponding sliding shoe, and wherein a first side face of the side faces of the sliding shoe is oriented along a first tangential direction and a second side face of the side faces is oriented along a second tangential direction opposite to the first tangential direction. Background Art

[0006] A universal flywheel device is described in DE 10 2019 133 200 B3. The flywheel ring is an inner ring for a seat on a shaft. The clamping element located in the flywheel cage is intended for clamping contact with an inner cylindrical clamping track, which is formed on the outer ring of the flywheel device or on the housing of the machine component. The clamping element is a clamping roller and, when installed, is held in a free running position relative to the clamping track via a cage and an inserted spring during free running mode. In locking mode, the clamping rollers run on the clamping ramps against the force of the springs so that they are clamped between the clamping ramps and the clamping track. As soon as the direction of rotation of the flywheel ring changes or is overtaken during free rotation, the clamping between the clamping roller and the clamping track is released, and the clamping roller moves back to the free rotation position by means of the spring action.

[0007] The flywheel ring and the clamping track must be oriented concentrically to each other so that in the flywheel position there is sufficient radial play between the clamping element and the clamping track and the position of the clamping roller is accurate in the locking function. This is done with the help of a sliding shoe that is in one piece with the flywheel ring. The sliding shoe protrudes radially in the direction of the clamping track so that the radial play between the sliding shoe and the clamping track is as small as possible to ensure the desired concentricity at a minimum level even in extreme cases.

[0008] The position of the clamping rollers relative to each other is fixed by the pockets and also by means of springs. In order to ensure that the pockets are precisely oriented with the clamping ramps, the cage is held on the sliding shoes. For this purpose, the cage is provided with retaining sections. Each of the sliding shoes engages in one of the retaining sections and is tightly guided therein. The cage is prevented from twisting about the flywheel axis and thus from shifting the pockets from their predetermined position relative to the clamping ramps.

[0009] When the flywheel is in operation, the cage is subject to high mechanical stresses due to the sudden changes between the flywheel position and the locking function and the associated dynamics. Summary of the invention

[0010] The object of the invention is to create a flywheel for high loads which can be produced cost-effectively.

[0011] This object is achieved according to the subject matter of claim 1 .

[0012] The invention is concerned in particular with the design of the cage, its positioning and mounting on the sliding shoe on the one hand, and with improvements with regard to the interaction of the cage with the flywheel ring of the flywheel on the other hand.

[0013] The invention therefore also relates to a single cage for a flywheel arrangement according to the invention, which has all the features described above or below and which relate to the shape of the recesses.

[0014] According to the invention, it is provided that at least one of the retaining portions formed on the retaining frame is provided with two protrusions on the inner side of the retaining portion. The protrusions are arranged axially adjacent to each other on the retaining frame in an axial direction parallel to the flywheel axis and protrude from the retaining frame into the recess in a tangential or circumferential direction. The protrusions protrude from the retaining frame together into the retaining portion in the direction of one of the side faces of the corresponding sliding shoe-shaped portion by the same distance or at different tangential distances from the retaining frame structure into the recess.

[0015] The flywheel axis is also the axis of rotation of the rotating flywheel ring and / or the axis of rotation of the clamping track. In the context of the present invention, the flywheel axis is defined as an axial orientation, independently of its actual position in space. Radial is therefore defined as perpendicular to the flywheel axis. Tangential refers to an orientation having a tangent which, at any point and in any plane, lies on a circumferential circle concentrically around the flywheel axis in a radial plane. The circumferential direction is therefore a direction extending along a line of curvature of the flywheel axis around the circumferential circle.

[0016] The advantage of the invention is that the cage and its retaining part are no longer guided "over the entire surface" on the side of the sliding shoe. A recess is formed between the two projections, by which the cage is no longer supported over its entire surface on this side, but on a two-point support. This makes it possible to compensate for rigid contact or one-sided rigid tilting due to torsion between the cage and the sliding shoe under certain dynamic conditions. In addition, the recess provides an additional space or reservoir or passage for lubricant. In addition, the free space in the recess can be used to accommodate a spring. The spring clip can engage in this space without annoyingly protruding from the retaining part and without unnecessary contact with the sliding shoe. In addition, the projection can prevent material accumulation, material duplication or thickening on the cage. The cage prolongs its service life by saving material and avoiding voltage peaks during operation. The cage is made of metal or plastic and / or a combination of materials. In particular, in the case of a cage produced by injection molding and / or casting, the measures according to the invention also help to make the wall thickness and wall thickness transition on the cage uniform.

[0017] The invention can be advantageously applied to both types of flywheel arrangements without changing the basic principle, ie to flywheel rings designed as inner rings or outer rings. In the sense of the invention, a flywheel ring is always a ring with a clamping structure and a sliding shoe.

[0018] According to a preferred embodiment of the invention, the sliding shoes extend radially from the outer ring in the direction of the flywheel axis, and therefore the sliding shoes and the clamping ramps between the sliding shoes are oriented radially inwards. The sliding shoes are fixed to the flywheel ring in both types of flywheels: that is, a flywheel with an inner flywheel ring or a flywheel with an outer flywheel ring. Fixed means attached in an immovable manner, or made of a single piece, a single material, formed integrally with the flywheel ring by the material of the flywheel ring.

[0019] In order to maintain the position of the cage during assembly and, if necessary, during operation, the cage must be held in the flywheel in the axial direction. Therefore, an embodiment of the invention provides that at least one snap hook is formed in the respective retaining portion. The snap hook engages axially behind the respective sliding shoe at the edge or surface of the axially pointing front face of the sliding shoe. The snap hook does not require any additional installation space and can advantageously be integrated into the production of the cage.

[0020] However, a preferred embodiment of the invention provides one or more protrusions protruding from at least one of the protrusions, whereby the system or guide and its dynamic adjustment behavior can be optimized even further. The protrusions are located on one or both sides of the sliding shoe. This measure allows the movement between the sliding shoe and the cage to be improved, optimized, limited or fine-tuned. One embodiment of the invention provides that the protrusion or multiple protrusions on the side are elastically prestressed in the direction in which the protrusions protrude together to guide the cage against the flywheel ring without clearance. Therefore, it is preferred and advantageous to guide the cage without clearance relative to the sliding shoe and to position the recess relative to the inclined surface as far as possible without displacement. In this sense, another embodiment of the invention provides that two pairs of protrusions are formed in the retaining part, wherein the first pair of protrusions are opposite to the first side of the sliding shoe and the other pair of protrusions are opposite to the second side of the sliding shoe. The cage is guided under the same conditions on both sides of the sliding shoe. This achieves a symmetrical and thus simplified design of the cage and the sliding shoe, as well as a uniform distribution of the load and the bearing behavior in two tangential directions. The reservoir for lubricant is larger. An improvement of the above measures is that, as provided in one embodiment of the invention, two of the projections, each of which is elastically prestressed against one of the sliding shoes, are located opposite each other on the corresponding sliding shoe in the tangential or circumferential direction. The sliding shoe is thus elastically clamped between the projections, thereby ensuring a symmetrical release of the cage relative to the flywheel ring.

[0021] Another embodiment of the invention provides that the corresponding projection is formed on a projection which, when viewed in the axial direction, laterally follows a first front face of the sliding shoe, wherein the first front face is not covered by the cage. Thus, the system with a reduced clearance or clearance-free clamping device acts at a point where the recess would otherwise widen and the clearance between the cage and the sliding shoe would undesirably increase.

[0022] Finally, one embodiment of the invention provides that on one of the front faces, the corresponding sliding shoe received in one of the retaining parts is at least partially covered by the connecting web of the cage, and the other front face remains free. In this way, during assembly of the flywheel arrangement, the sliding shoe of the flywheel ring can advantageously be pushed axially from one side into the recess. The connecting web connects two adjacent pockets of the cage and at the same time axially delimits the recess designed in the tangential or circumferential direction between the two pockets. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be described in more detail below by means of exemplary embodiments. Figures 1 to 8 The drawings in the drawings are not drawn to scale. In the drawings:

[0024] - Figure 1 - shows an overall view of the flywheel device 1,

[0025] - Figure 2 - the flywheel device 1 is shown in an overall view, wherein the pre-assembled assembly 23 is shown separated from the flywheel ring 2 in an exploded view, wherein the flywheel ring 2 is in the foreground,

[0026] - Figure 3 - The flywheel device 1 is shown in an overall view, wherein the Figure 2 The known pre-installed component 23 is separated from the flywheel ring 2, wherein the pre-installed component 23 is in the foreground,

[0027] - Figure 4 - Shown in an overall view Figure 2 and Figure 3 The retainer 3 of the pre-installed assembly 23 shown in FIG.

[0028] - Figure 5 - shows an overall view of the flywheel device 20,

[0029] - Figure 6 - a pre-assembled assembly of a flywheel device 20 is shown in an overall view, the pre-assembled assembly having a cage 24, a clamping element 4 and a spring 5,

[0030] - Figure 7 - shows a detail of a section in a radial plane of the flywheel device 20, and

[0031] - Figure 8 - Shows the front Figure 7 Detail of the cage 24 in the radial plane 7, the cage in this illustration is Figure 7 The flywheel ring 2 is shown disengaged. DETAILED DESCRIPTION

[0032] Figure 1– The flywheel arrangement 1 is formed by a flywheel ring 2, a cage 3, a clamping element 4 and a spring 5. The flywheel ring 2 and the cage 3 are oriented concentrically to one another on an axially oriented flywheel axis 10. The sliding shoes 7 are formed integrally with the flywheel ring 2. A clamping bevel 6 is formed between each two adjacent sliding shoes 9. The sliding shoes 7 and the clamping bevel 6 are radially oriented in the direction of the flywheel axis 10 and point in this direction. The radial direction extends perpendicularly to the flywheel axis 10, for example a radial axis A intersecting the center axis 10 at the center point Z. The cage 3 has a section 27 guided between the sliding shoes 7 in the circumferential direction around the center axis 10. Different groups of projections 28, 29 and 30 project radially outwards from the flywheel ring 2 designed as a flywheel outer ring. These projections 28, 29 and 30 serve to prevent the flywheel ring 2 from rotating relative to a housing or component not shown. These projections are arranged on the circumference of the flywheel ring 2 in such a way that an axially oriented installation of the flywheel device 1 is ensured, ie a reversal of the axial installation direction is avoided.

[0033] Figure 2 and Figure 3 The cage 3 is provided with retaining portions 9 between the segments 27. Each segment 27 is provided with three pockets 8. A clamping element 4 and a spring 5 are inserted into each of the pockets 8. In the illustrations, the cage 3 is positioned axially opposite the flywheel ring 2 so that the retaining portions 9 of the cage 3 point toward the sliding shoes 7. During the axial movement of the cage 3 and the flywheel ring 2 toward each other, each of the sliding shoes 7 engages in one of the retaining portions 9. The cage 3 and the flywheel ring 2 can be pushed axially into each other until the respective sliding shoe 9 rests axially on the connecting web 21. The connecting web 21 axially limits the retaining portions 9 in one direction and connects the two segments in the segment 27. The cage 3 is guided on both sides 11, 12 of the respective sliding shoe 9 or, in the case shown, is guided on the first side 11 and on the second side 12 and is retained with snap hooks 15.

[0034] Figure 3 When the cage 3 and the flywheel ring 2 are mounted together, the front face 23 of the respective sliding shoe 7 is at least partially covered by the connecting web 21 of the cage 3 .

[0035] Figure 4 - The cage 3 is provided with retaining parts 9 between the segments 27. Each segment 27 is provided with three recesses 8. The connecting web 21 axially limits the retaining part 9 in one direction and connects two segments of the segment 27. At least one snap hook 15 is formed in the corresponding retaining part 9, Figure 1The corresponding sliding shoe 7 in the flywheel device 1 shown is engaged axially behind the front face 16 by means of a snap hook. In addition, each of the retaining parts 9 is provided with two projections 13 and 14 which are arranged axially adjacent to each other parallel to the axial direction and project into the retaining part 9.

[0036] Figure 5 -The flywheel device 20 is formed by the flywheel ring 2, the cage 24, the clamping element 4 and the spring 5. The sliding shoe 7 is formed in one piece with the flywheel ring 2. A clamping slope 6 is formed between each two adjacent sliding shoes 9. The sliding shoes 7 and the clamping slope 6 point radially inward. The cage 24 has a section 27 guided between the sliding shoes 7 in the circumferential direction.

[0037] Figure 6 - The cage 24 is provided with holding parts 9 between the segments 27. Each segment is provided with three recesses 8. The clamping element 4 and the spring 5 are inserted into each of the recesses 8. The connecting web 21 axially limits the holding part 9 in one direction and connects two segments in the segment 27. Two pairs 17 and 18 of projections 25 and 26 are formed in the respective holding part 9. At least one protrusion 19 protrudes from the first projection 25 at the front of the holding part 9. A recess 32 is formed between the projections 25 and 26 of the respective pair 17 or 18.

[0038] Figure 7 – It can be seen: the flywheel ring 2 with the sliding shoe 7; the cage 24 with the retaining part 9, which in the figure is almost filled by the sliding shoe 7; the two pockets in the pocket 8 with the clamping element 4 and the spring 5. The clamping element 4 is assigned to the clamping bevel 6 of the flywheel ring 2, which is designed as a flywheel outer ring, since the clamping bevel 6 points radially inwards. The sliding shoe 7 is seated in the retaining part 9. The pockets 8 adjacent to the retaining part 9 on the left and right are delimited in the tangential direction or circumferential direction of the retaining part 9 by transverse webs 31. The projections 25 are visible in the foreground on the respective transverse web 31. The respective spring 5 is clamped on the transverse web 31 by means of a spring clip 33 (only visible once in the cutout) and is thus held in the pocket 8 and positioned relative to the clamping element 4. The spring clip 33 engages in the free space formed by the recess 32, so that there is no contact between the side 11 of the sliding shoe 7 and the spring clip 33.

[0039] A protrusion 19 is formed on the corresponding protrusion 25. The protrusions 19 of the first pair 17 of protrusions 25 rest on the first side 11 of the sliding shoe 7, and the protrusions 19 of the pair 18 of protrusions 25 rest on the second side 12 of the sliding shoe. The protrusions 19 on the retaining portion 9, which are opposite to each other, are elastically prestressed towards each other in the tangential direction against the sliding shoe 7.

[0040] Figure 8 – Shows the Figure 6 2 shows a cross section of a pre-mounted assembly having a holder 24, a clamping element 4 and a spring 5. The recesses 8 adjacent to the holder 9 on the left and right are defined by transverse webs 31 in the tangential direction or circumferential direction of the holder 9. The sections 27 adjacent to the holder 9 are connected to each other by connecting pieces 21. At least one protrusion 19 protrudes into the holder 9 from a corresponding first protrusion 25 located in the front of the holder 9. The recesses 8 adjacent to the holder 9 on the left and right are defined by transverse webs 31 in the tangential direction or circumferential direction of the holder 9. The protrusions 25 are visible in the foreground on the corresponding transverse webs 31. The corresponding spring 5 is clamped on the transverse web 31 by a spring clip 33. The spring clip 33 engages in the free space formed by the recess 32.

[0041] Reference numerals list

[0042] 1Flywheel device

[0043] 2 flywheel ring

[0044] 3 Cage

[0045] 4 Clamping elements

[0046] 5 Spring

[0047] 6 Clamping bevel

[0048] 7 Sliding shoe

[0049] 8 Retainer pocket

[0050] 9. Holding unit

[0051] 10Flywheel shaft

[0052] 11 First side of the sliding shoe

[0053] 12 The second side of the sliding shoe

[0054] 13 First protrusion on the retainer

[0055] 14 Second protrusion on the retainer

[0056] 15 snap-fit ​​hook

[0057] 16 first front face of the sliding shoe

[0058] 17 first pair of protrusions

[0059] 18 second pair of protrusions

[0060] 19 convex part

[0061] 20 Flywheel device

[0062] 21 Connecting web

[0063] 22 second front surface of the sliding shoe

[0064] 23 pre-assembled components

[0065] 24 cage

[0066] 25 first protrusion

[0067] 26 Second protrusion

[0068] 27 Segment of cage

[0069] 28 protrusion

[0070] 29 Protrusion

[0071] 30 protrusion

[0072] 31 Transverse web

[0073] 32 recess

[0074] 33 Spring Clip

Claims

1. A flywheel device (1, 20), the flywheel device being formed by a flywheel ring (2), a retaining frame (3, 24), a clamping element (4) and a spring (5), wherein: A concentric arrangement of the flywheel ring (2) and the cage (3, 24) relative to one another on an axially oriented flywheel axis (10) is provided, and: - a sliding shoe (7) is oriented between two adjacent sliding shoes (9) and a clamping bevel (6) is oriented on the flywheel ring (2), - the cage (3, 24) is guided on the sliding shoe (7) in a tangential direction about the flywheel axis (10) and has a recess (8) and a retaining portion (9), - in each case at least one of the clamping elements (4) and at least one of the springs (5) is received in one of the recesses (8), - in each case one of the sliding shoes (7) is received in one of the retaining parts (9), wherein the retaining frame (3, 24) is guided on two side faces (11, 12) of the respective sliding shoe (9), and a first side face (11) of the side faces of the sliding shoe (9) is oriented in a first tangential direction and a second side face (12) of the side faces (11, 12) is oriented in a second tangential direction opposite to the first tangential direction, Characterized in that at least one of the retaining portions (9) is provided with two protrusions (13, 14, 25, 26), which are arranged axially adjacent to each other and parallel to the axial direction of the flywheel axis (10), and wherein the protrusions (13, 14, 25, 26) protrude together from the retaining frame (3, 24) into the retaining portion (9) in the direction of one of the side surfaces (11, 12) of the corresponding sliding shoe (9).

2. The flywheel device (1, 20) according to claim 1, characterized in that The sliding shoe (9) extends radially from the flywheel ring (2) in the direction of the flywheel axis (10), and the clamping bevel (6) is oriented radially inwards.

3. The flywheel device (1) according to claim 1 or 2, characterized in that: At least one snap hook (15) is formed in the respective retaining portion (9), said snap hook engaging axially behind the respective sliding shoe (7) on the front face (16).

4. The flywheel device (20) according to claim 1 or 2, characterized in that: At least one protrusion (19) protrudes from at least a first protrusion (25) of the protrusions (25, 26), wherein the protrusion (19) rests on one of the side surfaces (11, 12).

5. The flywheel device (20) according to claim 4, characterized in that: The projections (19) on the side surfaces (11, 12) are elastically prestressed against the sliding shoe (7) in a direction in which the projections (25, 26) project together.

6. The flywheel device (20) according to claim 1 or 2, characterized in that: Two pairs (17, 18) of protrusions (25, 26) are formed in the retaining portion (9), wherein a first pair (17) is opposite to a first side surface (11) of the sliding shoe (7), and the other pair (18) is opposite to a second side surface (12) of the sliding shoe.

7. The flywheel device (20) according to claim 6, characterized in that At least one protrusion (19) protrudes from at least one of the protrusions (25, 26) of at least one of the pairs (17, 18) and is elastically prestressed against one of the side surfaces (11, 12) in such a way as to rest on one of the side surfaces (11, 12) of the corresponding sliding shoe (7).

8. The flywheel device (20) according to claim 4 or 6, characterized in that: Two of the projections (19) are elastically prestressed against one of the sliding shoes (7) and are located tangentially opposite each other on one of the sliding shoes (7).

9. The flywheel device (20) according to claim 4 or 6, characterized in that: A corresponding projection (19) is formed on a projection (25) which, viewed in the axial direction, is laterally along a first front face (16) of the sliding shoe (7), wherein the first front face (16) is not covered by the cage (3).

10. The flywheel device (1, 20) according to claim 1 or 2, characterized in that: The corresponding sliding shoe (7) received in one of the retaining portions (9) has a first front face (16) and a second front face (23) facing away from the first front face (16), wherein the side faces (11, 12) are adjacent to the front faces (16, 23), wherein at least one of the front faces (16, 23) is at least partially covered by a connecting web (21) of the retaining frame (3), wherein the front face (23) covered by the connecting web (21) points in a direction aligned with the flywheel axis (10), and wherein the retaining portion (9) is delimited by the connecting web (21), and two of the recesses (8) of the retaining frame (3) are connected to each other via the connecting web (21) in a circumferential direction around the flywheel axis (10).

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