JP2007078184A - Rotating spring - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotating spring capable of being easily assembled, and having a compact and tough structure. <P>SOLUTION: First and second members 9, 10 are relatively rotatable, at least one spring element 11 acts between the first and second members 9, 10, and is deformed by the first and second members 9, 10 in relative rotating motion of the first and second members 9, 10, at least one spring element 11 is retained in a first receiving portion 13 formed on the first member 9 through a first connecting portion 12, and in a second receiving portion 15 formed on the second member 10 through a second connecting portion 14, the first member 9 has at least one first power transmitting element 16, and the first receiving portion 13 is formed in or beside the first power transmitting element 16. At least one first power transmitting element 16 has a hub element fixed to a rotatable shaft or a crank shaft, and a connecting means 20 constructing connection by fitting based on the shape. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a rotary spring. More particularly, the present invention comprises a first member on the input side and a second member on the output side and is located at or near the rotatable shaft of the internal combustion engine, in particular at or near the crankshaft. A rotary spring for disposing, wherein the first and second members are rotatable relative to each other, and at least one spring element acts between the first member and the second member, and the spring The element is deformed by the first and second members during the relative rotational movement of the first and second members, and at least one spring element is formed in the first member via the first connection portion. In addition, the first housing is held in the second housing portion provided in the second member via the second connection portion, and the first member is in the first power transmission element or the first power transmission element. Rotating spring having at least one first power transmission element formed . The present invention further relates to a belt pulley provided with such a rotary spring.

  Rotating springs are used in various applications in various technical fields to cooperate with a rotatable shaft, and can be used to technically decouple and insulate vibrations during driving. One important form that is particularly suitable for application of the present invention is the form of driving an automobile accessory through a belt.

  A rotary spring having a second member that is relatively movable via a first member and one spring is already known (see, for example, Patent Document 1). In this known embodiment, the power transmission element on the input side extends in the axial direction and has a hole that is used for frictional engagement based on friction using screws. As another method, Patent Document 1 proposes joining corresponding to a material using friction engagement type fixing or welding with a rivet or an adhesive. The disadvantage of the embodiment according to US Pat. No. 6,057,059 is that it requires a relatively large required space and is expensive to assemble.

Another rotating spring is known (see, for example, Patent Document 2).
German Patent No. 10157330 German Patent No. 102004043136

  An object of the present invention is to provide a rotary spring that is easy to assemble and that enables a compact and robust structure.

  The object is to provide a first member on the input side and a second member on the output side, which are arranged on or near the rotatable shaft of the internal combustion engine, in particular on or near the crankshaft. A rotary spring, wherein the first and second members are rotatable relative to each other, at least one spring element acts between the first member and the second member, and the spring element is the first and second members At the time of relative rotational movement of the two members, the first and second members are deformed, and at least one spring element is connected to the first housing portion formed in the first member via the first connection portion and the second member. The first housing has at least one first power transmission element, and the first member has at least one first power transmission element. The first power transmission element or the first power transmission element In the case where the first accommodating portion is formed, at least one first movement Transfer element is solved by rotating the spring, characterized in that it comprises a connection means for establishing a connection by fitting based on the hub elements and shape are fixed to a rotatable shaft or a crankshaft. In other words, the problem is solved by a rotary spring having the features of claim 1. According to this, at least one first power transmission element has connection means for establishing a shape-fitting connection based on shape with a hub element fixed to or close to a rotatable shaft. With this embodiment, a particularly simple assembly is achieved. By connecting the first power transmission element and the shaft or the hub element fixed to the shaft in a form-fitting manner, a separate fixing means, such as a screw, requiring a lot of time for assembly. It can be omitted. In the embodiment according to the invention, it is only necessary to urge the rotary spring on the shaft or on the hub element and in this case by a shape fit based on the shape provided by the shape of the adjacent member. In particular, this shape-fitting connection can reliably transmit a large force in a small space.

  The first power transmission element for constructing the shape-fitting connection is formed with an internal contour having a shape different from a circular shape, in particular an internal contour having protrusions and / or recesses, so that it is particularly compact. A structure is achieved. Moreover, the shaft or hub element on which the first power transmission element is disposed is shaped to communicate with the first power transmission element to allow the shaft or hub element to engage the first power transmission element. Have

  It is preferable that the protrusion and / or the recess be formed on the radially inner side of the at least one first power transmission element. The hub element or shaft has a corresponding protrusion and / or recess formed radially outward.

  In the present invention, a configuration in which at least one spring element extends in the circumferential direction over the outer peripheral portion of the first member and / or the second member can be considered. By disposing at least one spring element on the outside and radially outward with respect to the first and second power transmission elements, it is possible to provide a large spring force in a small space.

  In this embodiment, it has proven to be suitable when the at least one spring element is formed as a bending rotary spring and in particular has a C-shaped, arcuate, annular arc and / or sickle shape. . Such a spring provides a large spring force in a small space.

  According to an advantageous development of the invention, the second member has at least one second power transmission element in which a second housing part is formed. This second power transmission element can absorb and transmit the spring force.

  A small structural shape is also possible by having at least one second power transmission element formed in a substantially circular arc shape and in particular having an open C-shaped shape.

  Another improvement is achieved by the fact that the second member comprises a housing that houses at least one second power transmission element and / or at least one spring element.

  Assembly is performed by the housing having at least one connection point that is at least partially housed in a recess formed in a fixed portion of the at least one second power transmission element. A stable shape fit can be established between the second fixed part and the housing via the connection point. In particular, at the time of assembly, it is only necessary to insert at least one connection point in the at least one second power transmission element, and no additional tightening means are required at that location.

  In particular, the assembly has a housing having at least one first housing part and at least one second housing part, which are connected to each other by connecting means, a connection point is provided on the first housing part, and It becomes easier by being supported by two housing parts.

  Another improvement in stability can also be achieved if the connection point provided in the first housing part is provided with a hole for receiving the connection means in the at least one connection point.

  Furthermore, in the present invention, the housing has a portion that faces radially inward and at least partially surrounds the first member and / or at least one first power transmission element, and seals the radially inward portion. In particular, a radial shaft seal ring can be provided for sealing against the shaft or a hub element fixed to the shaft. In this embodiment, it is particularly advantageous when the housing is filled with a particularly liquid medium, such as lubrication and also oils used for buffering. This embodiment having a radially inward portion has the advantage that a seal can be disposed between the second member and the shaft or hub portion. In this case, sealing with respect to the first member is unnecessary. The liquid medium is pushed out by the centrifugal force generated when the rotary spring rotates. The resulting pressure does not create a load on the seal.

  A good seal is also achieved by the fact that the seal is arranged beside the at least one spring element on both axial sides.

  According to another advantageous feature of the invention, the housing is opened only in the direction facing radially inward.

  The problem underlying the present invention is further solved by a belt pulley provided with a rotary spring, in which case the second member has a ring forming a support surface for the belt.

  The invention comprises a first member (9) on the input side and a second member (10) on the output side and is located at or near the rotatable shaft of the internal combustion engine, in particular at or near the crankshaft. The first and second members (9, 10) are rotatable relative to each other, and the first member and the second member (9, 10) are connected to each other. At least one spring element (11, 11 ′, 11 ″, 11 ′ ″) acting between the first and second members (9, 10) during the relative rotational movement of the first and second members (9, 10). A first housing part (9, 10) which is deformed by the second member (9, 10) and at least one spring element (11, 11 ′, 11 ″, 11 ′ ″) is formed in the first member (9). 13) via the first connection part (12) and held by the second housing part (15) provided on the second member (10) via the second connection part (14). (9) at least one The first power transmission element (16, 16 ′, 16 ″, 16 ′ ″) and the first accommodating portion (13) formed in or next to the first power transmission element; One primary power transmission element (16, 16 ′, 16 ″, 16 ′ ″) to establish a connection with a shape-based fit with a hub element fixed to a rotatable shaft or crankshaft It has the connection means (20). According to the configuration of the present application, a rotary spring is provided that is easy to assemble and that provides a compact and robust structure.

  1 and 2 show a belt pulley 1 provided with a rotary spring 2 of the present invention. FIG. 2 shows a section along the line AA in the view shown in FIG.

  The belt pulley 1 includes a ring 3 that circulates and extends in the circumferential direction on which a support surface 4 for supporting a belt (not shown) is formed. A groove 5 that is continuous in the circumferential direction is provided in the support surface 4. The support surface 4 is delimited on both sides in the axial direction by raised edges 6 guiding the belt.

  Furthermore, an annular hub element 7 surrounding the shaft is provided on the radially inner side, and the belt pulley 1 provided with the rotary spring 2 can be fixed to a shaft (not shown) via the hub element. For this purpose, the hub element 7 has a recess 8 that allows the shaft and the hub element 7 to be screwed together. In contrast to what is shown, the belt pulley 1 with the rotary spring 2 can also be attached directly to the shaft, i.e. without the hub element 7, or close to the shaft.

  The rotary spring 2 has a first member 9 on the input side and a second member 10 on the output side, and both the first and second members are rotatable relative to each other. At least one spring element 11, 11 ′, 11 ″, 11 ′ ″ acts between the first member 9 and the second member 10, and this spring element is a relative rotational movement of the first member and the second member. Sometimes it is deformed by the first and second members 9 and 10. In the illustrated embodiment, four spring elements 11, 11 ′, 11 ″, 11 ′ ″ are provided side by side in the axial direction.

  The spring elements 11, 11 ′, 11 ″, 11 ′ ″ are identical to each other and are arranged side by side in the axial direction so as to form a spring set. The spring elements 11, 11 ′, 11 ″, 11 ′ ″ are provided on the second member 10 via the first connection portion 12 in the first housing portion 13 formed on the first member 9. The second accommodating portion 15 is held via the second connecting portion 14. For this purpose, the first member 9 has a number of first power transmission elements 16, 16 ′, 16 ″, 16 ′ ″ corresponding to the number of springs 11, 11 ′, 11 ″, 11 ′ ″. In each of the first power transmission elements 16, 16 ′, 16 ″, 16 ′ ″, the first connecting portions 12 of the respective spring elements 11, 11 ′, 11 ″, 11 ′ ″ are accommodated. One first accommodating portion 13 is provided for this purpose. Similarly, the second member 10 has a number of second power transmission elements 17, 17 ′, 17 ″, 17 ′ ″ corresponding to the number of spring elements 11, 11 ′, 11 ″, 11 ′ ″. Each of the second power transmission elements has a second accommodating portion 15 for accommodating a second connecting portion 14 of each of the individual spring elements 11, 11 ′, 11 ″, 11 ′ ″. One is formed.

  FIG. 3 particularly clearly shows the arrangement of the spring element 11 and the first and second power transmission elements 16, 17. For the sake of clarity, FIG. 3 does not show the entire spring element, only the spring element 11 with the associated first and second power transmission elements 16 and 17. The other spring elements 11 ′, 11 ″, 11 ′ ″ and the first power transmission elements 16 ′, 16 ″, 16 ′ ″ and the second power transmission elements 17 ′, 17 ″, 17 ′ ″ These are the same as the illustrated spring element 11 or the first and second power transmission elements 16 and 17. In order to avoid static and dynamic imbalances, two inner rotary springs 11 ′ with corresponding first and second power transmission elements 16 ′, 16 ″, 17 ′, 17 ″, respectively. , 11 ″ rotated by 180 ° in the circumferential direction with respect to the spring elements 11, 11 ″ or the first and second power transmission elements 16, 16 ′ ″, 17, 17 ′ ″ and reversed It is arranged by arrangement.

  As can be seen in particular in FIG. 3, the spring element 11 is formed as a bending rotary spring and has a substantially C-shaped, generally arcuate or sickle-shaped shape. The spring element 11 is made of elastic steel, in particular spring steel. The spring element can be produced, for example, as a stamped part. The first and second connection portions 12 and 14 are provided at the ends of the spring element 11, respectively. The connection portion is formed by being bent at a right angle and extends radially inward. The spring 11 is disposed along the circumferential direction on the radially outer side of the corresponding first and second power transmission elements 16 and 17. The first and second connecting portions 12 and 14 are each formed as an enlarged leg portion whose end portion is widened, and each leg portion is formed to correspond to the first or second portion that opens outward in the radial direction. It is accommodated in the accommodating parts 13 and 15. The second connecting portion 14 and the second accommodating portion 15 are formed so that an essential relative movement does not occur between the end portion of the spring element 11 and the second power transmission element 17, while the first accommodating portion 13. And the 1st connection part 12 is comprised so that the limited relative movement between the 1st power transmission element 16 and the spring 11 is possible in this embodiment. The particularly accurate relative mobility between the second connecting part 14 and the second accommodating part 15 is that the second end part 14 and the second accommodating part 15 are formed as a slide block and a slide block guide in the illustrated embodiment. To be achieved. An arcuate relative movement occurs between the second connecting portion 14 and the second accommodating portion 15. Thereby, the rotary spring 2 has a softer spring characteristic as indicated by a different, gently inclined soft spring characteristic curve over a certain angular range (spring characteristic A). This is because the rotational movement of the first power transmission element 16 is not completely transmitted but only partially transmitted to the spring element 11 by the movement that is possible between the first connection part 12 and the first housing part 13. Caused by. When the first connecting portion 12 comes into contact with one end or the other end of the first accommodating portion 13 according to a certain rotation angle, the spring element is fully actuated for the first time (spring characteristic B). Such an embodiment with a soft characteristic curve at a small rotation angle can greatly improve the vibration isolation. FIG. 4 illustrates this again in the upper right quadrant. Furthermore, the guide of the first connection part 12 in the slide block guide achieves a uniform load distribution over the entire spring element 11, especially when the deformation of the spring element 11 is large. When the engine drives the accessory device via the rotation spring 2, for example via a belt, the rotation spring 2 has a spring characteristic A when the load on the accessory device is small and when the load is high. It is disposed on the shaft of the engine so as to operate with a spring characteristic B (see FIG. 4). The first power transmission element 16 has an annular portion 18 extending around the rotation axis D. The annular portion is provided with a connecting portion 19 extending outward in the radial direction, and the connecting portion 19 is provided with a first accommodating portion 13 formed to be shifted outward in the radial direction. Connection means 20 for establishing a shape-fitting connection between the first power transmission element 16 or the first power transmission elements 16 ', 16' ', 16' '' formed identically and the hub element 7 Is formed. For this purpose, the first power transmission elements 16, 16 ′, 16 ″, 16 ′ ″ are provided with protrusions and recesses, and have an inner contour different from a circular shape. The hub element 7 has a shape that cooperates with the internal contour of the first power transmission elements 16, 16 ′, 16 ″, 16 ′ ″, and the protrusions of the hub element 7 have the first power transmission elements 16, 16 The protrusions of the first power transmission elements 16, 16 ′, 16 ″, 16 ′ ″ are accommodated in the recesses of the hub element 7 in the recesses of “16”, “16” ”. .

  The second power transmission element 17 has a substantially C-shape that is open in the same manner as the second power transmission elements 17, 17 ′, 17 ″, and 17 ′ ″ that are formed identically. In this case, the second power transmission elements 17, 17 ′, 17 ″, 17 ′ ″ are arranged radially adjacent to the first power transmission elements 16, 16 ′, 16 ″, 16 ′ ″. Has been.

  The first power transmission element 16, 16 ′, 16 ″, 16 ′ ″ is formed with a locking portion for contacting the second power transmission element 17 (or 17 ′, 17 ″, 17 ′ ″) One protruding portion 21 is formed. In this embodiment, the protrusion 21 is provided with a cap-shaped fixture 22, and this fixture is fixed on the protrusion 21 by a connecting portion that extends and protrudes inward in the radial direction. A fixture 22, which can be made, for example, from plastic, thereby causes a locking damping between the first and second power transmission elements 16,17. In this case, the locking portion starts from the stationary state of the first and second members 9 and 10 and the rotation angle between the first and second members 9 and 10 is, for example, −10 ° or less, in particular −5 °. It is arranged so that it is limited to the following and preferably from −2 ° to −3 °. This is shown in the lower left quadrant of FIG. This is particularly advantageous when the rotary spring 2 is used in combination with a starter generator or a belt starter.

  In particular, FIG. 2 shows a housing 23 in which the second member 10 houses second power transmission elements 17, 17 ′, 17 ″, 17 ′ ″ and spring elements 11, 11 ′, 11 ″, 11 ′ ″. It clearly shows that

  The housing 23 has, in the illustrated embodiment, eight connection points 24 housed in a recess 25 in the second power transmission element 17, 17 ′, 17 ″, 17 ′ ″. In this case, the housing 23 is of a two-part type, and includes a first housing part 26 and a second housing part 27. In this case, the connection point 24 is arranged in the first housing part 26, extends in the axial direction from the housing part, and abuts on the second housing part 27. The first and second housing parts 26, 27 are firmly fixed to each other via connecting means 28 formed as screws. In this embodiment, the connection point 24 is provided with a hole for accommodating the connection means 28.

  A ring 3 forming a support surface 4 for the belt is fixed to a radially outer portion of the housing 23 by connecting means 30 formed as a screw through a support portion 29.

  The housing 23 has portions 31, 31 ′ facing inward in the radial direction on both sides in the axial direction. With this configuration, the housing 23 covers the first power transmission element 16, 16 ′, 16 ″, 16 ′ ″ from the outside or at least partially surrounds the first power transmission element. This is particularly the case when the housing 23 of the second member 10 is connected to the hub element 7 by means of a shape-fitting connection between the first power transmission element 16, 16 ′, 16 ″, 16 ′ ″ and the hub element 7 ( This is possible because the housing can be formed so as to reach the axis (in the case of being arranged on one axis).

  With such a configuration, the housing 23 and, in particular, the portion 31, 31 ′ facing inward and the hub element 7 (or shaft) can be sealed, so that the sealing performance is also improved. For this purpose, on the opposite sides in the axial direction of the spring elements 11, 11 ′, 11 ″, 11 ′ ″ arranged as a spring set, in the illustrated embodiment, there is a seal 32 formed as a radial shaft seal ring. Is provided. The seal 32 abuts directly on the hub element 7 or on an axial guide element 33 incorporated in the hub element.

  In a radially outer region of the housing 23, a seal 34, for example formed as an O-ring, is inserted between the first and second housing parts 26, 27 to seal the first and second housing parts together. Yes.

  In order to support the belt pulley, a slide bearing 35 supported by a support portion 36 fixed to the hub element 7 is provided inside the ring 3 forming the support surface 4 for the belt. In this embodiment, the support 36 has a radially outer portion 37 bent at a right angle, which portion extends essentially in the axial direction and is formed between the ring 3 and the housing 23. Contained in space.

  The belt pulley 1 further has a vibration damper 38 fixed to the support portion 36. The vibration damper 38 includes a flywheel ring 39 disposed in high viscosity silicone oil.

  The housing 23 may be at least partially filled with a fluid (not shown), such as oil, to generate lubrication and / or rotational damping between the first and second members 9,10. This rotational damping is caused by the movement of fluid from the at least one reduced first partial space of the housing 23 into the second partial space that expands. Along with the movement of the fluid, a pressure for loading the housing 23 is generated, and an opening leg force is generated in the first and second housing portions 26 and 27 to be pushed out to both sides in the axial direction. In particular, FIG. 2 illustrates how this leg opening force is supported with minimal displacement about the rotary spring 2 by utilizing the connecting means 28, 30.

  The illustrated belt pulley is particularly suitable for use in an internal combustion engine of an automobile, in particular for driving an accessory device.

It is a perspective view including the fragmentary sectional view of the belt pulley provided with the rotation spring. It is sectional drawing of the belt pulley provided with the rotation spring of FIG. It is a front view which shows the spring element and the part of the 1st and 2nd member of a rotation spring. It is a figure which shows the change of the rotational moment with respect to the rotation angle of the belt pulley of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Belt pulley 2 Rotating spring 3 Ring 4 Belt support surface 5 Groove 6 Raised edge 7 Hub element 8 Recess 9 First member
10 Second part
11, 11 ', 11'',11''' spring element
12 First connection
13 First container
14 Second connection
15 Second housing part
16, 16 ', 16'',16''' 1st power transmission element
17, 17 ', 17'',17''' second power transmission element
18 Annular part
19 Connection
20 Connection method
21 Projection
22 Fixture
23 Housing
24 connection points
25 recess
26 First housing part
27 Second housing part
28 Connection method
29 Support
30 Connection method
31, 31 'Inward facing part
32 seals
33 Guide elements
34 Seal
35 plain bearings
36 Support
37 Outer part
38 Vibration damper
39 Flywheel ring D Rotating shaft

Claims (15)

The first member (9) on the input side and the second member (10) on the output side are provided and arranged on or near the rotatable shaft of the internal combustion engine, in particular on or near the crankshaft. A rotary spring (2) for rotating the first and second members (9, 10) relative to each other between the first member and the second member (9, 10). At least one spring element (11, 11 ′, 11 ″, 11 ′ ″) acts and the spring element is in the first and second members (9, 10) during the relative rotational movement of the first and second members. A first housing which is deformed by the second member (9, 10) and in which the at least one spring element (11, 11 ′, 11 ″, 11 ′ ″) is formed in the first member (9). Held in the part (13) via the first connection part (12) and in the second housing part (15) provided in the second member (10) via the second connection part (14), The first member ( ) Has at least one first power transmission element (16, 16 ′, 16 ″, 16 ′ ″) and a first housing (in the first power transmission element or in the first power transmission element). 13) is formed,
Connection of the at least one first power transmission element (16, 16 ′, 16 ″, 16 ′ ″) with a hub element fixed to the rotatable shaft or the crankshaft by a shape-based fit Rotating spring, characterized in that it has connection means (20) for constructing.   In order to build a connection with a mating fit based on the shape, the first power transmission element (16, 16 ′, 16 ″, 16 ″ ′) has an internal profile different from a circular shape, in particular a protrusion and / or The rotary spring according to claim 1, wherein the rotary spring has an inner contour provided with a recess.   The protrusion and / or recess is formed radially inward of the at least one first power transmission element (16, 16 ', 16' ', 16' ''). A rotating spring as described in 1.   The at least one spring element (11, 11 ′, 11 ″, 11 ′ ″) extends in a circumferential direction over a portion of the outer periphery of the first member (9) and / or the second member (10) The rotation spring according to any one of claims 1 to 3, wherein   The at least one spring element (11, 11 ′, 11 ″, 11 ′ ″) is formed as a bending rotary spring, in particular having a C-shaped, arcuate and / or sickle shape. The rotary spring according to any one of 1 to 4.   The second member (10) has at least one second power transmission element (17, 17 ′, 17 ″, 17 ′ ″) in which the second accommodating portion (15) is formed. The rotary spring according to any one of claims 1 to 5.   The at least one second power transmission element (17, 17 ′, 17 ″, 17 ′ ″) is substantially arc-shaped and has a particularly open C-shape. Item 7. The rotary spring according to Item 6.   Said second member (10) may be said at least one second power transmission element (17, 17 ′, 17 ″, 17 ′ ″) and / or said at least one spring element (11, 11 ′, 11 ′). 8. The rotary spring according to claim 1, further comprising a housing (23) for housing “, 11 ′ ″).   The housing (23) is at least partially in a recess (25) formed in a portion to which the at least one second power transmission element (17, 17 ′, 17 ″, 17 ′ ″) is fixed. 9. A rotary spring according to claim 8, characterized in that it has at least one connection point (24) accommodated in a static manner.   The housing (23) has at least one first housing part (26) and at least one second housing part (27), and the first and second housing parts are connected to each other by connecting means (28). The rotary spring according to claim 9, wherein the connection point (24) is provided in the first housing part (26) and supported by the second housing part (27).   11. The rotary spring according to claim 10, wherein a hole for accommodating the connection means (28) is provided in the at least one connection point (24).   The housing (23) at least partly surrounds the first member (9) and / or the at least one first power transmission element (16, 16 ', 16' ', 16' '') in a radial direction A hub element having an inwardly facing portion (31, 31 ') and being fixed to the radially inwardly facing portion (31, 31'), in particular a seal (32), in particular the rotatable shaft or the crankshaft The rotary spring according to any one of claims 8 to 11, further comprising a radial shaft seal ring for sealing against (7).   13. The seal (32) is arranged on both sides in the axial direction next to the at least one spring element (11, 11 ′, 11 ″, 11 ′ ″). A rotating spring as described in 1.   The rotary spring according to any one of claims 8 to 13, wherein the housing (23) is opened only in a direction facing a radially inner side.   A belt pulley (1) comprising a rotary spring (2) according to any one of claims 1 to 14, wherein the second member (10) forms a support surface (4) for supporting the belt. A belt pulley having a ring (3).

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