JP2015214180A - Wiper motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an output shaft from tilting greatly.SOLUTION: Between an output shaft 31 and an opening 11a in which the output shaft 31 penetrates and which communicates inside and outside of a back door 14, a tilting restriction projection 63 is provided for restricting tilting of the output shaft 31 with respect to the opening 11a. Thereby, even when a great external force is loaded on a tip side of the output shaft 31 in a direction orthogonal to an axial direction of the output shaft 31, the output shaft 31 can be prevented from tilting greatly. Therefore, occurrence of failure in which a seal cap 50 deforms greatly, sound is generated from a fixing portion F1 between a wiper motor 10 and an inner panel 15 and the like can be prevented.

Description

  The present invention relates to a wiper motor that is provided inside a vehicle body and swings a wiper member located outside the vehicle body.

  2. Description of the Related Art Conventionally, a rear wiper device used for wiping a rear glass of an automobile or the like has a wiper motor provided with a gear mechanism that converts rotational motion into swing motion. Then, by rotating the motor shaft of the wiper motor and swinging the output shaft, the wiper member fixed to the tip of the output shaft swings, thereby wiping rainwater and the like adhering to the surface of the rear glass. . The wiper motor includes a motor unit having a motor shaft, and a gear unit having a gear mechanism and an output shaft. These motor part and gear part are connected to each other and fixed to the inside of the vehicle body via a bracket.

  Such a wiper motor is described in Patent Document 1, for example. The wiper motor described in Patent Document 1 is fixed to an inner panel inside the back door (vehicle body), and a pivot shaft (output shaft) protruding from the gear case (housing) of the wiper motor is a rear window glass (rear glass). It extends outside through an opening (communication hole). That is, the proximal end side (gear mechanism side) of the pivot shaft is disposed inside the back door, and the distal end side (wiper member side) of the pivot shaft is disposed outside the back door. The inside and outside of the back door are sealed by a substantially cylindrical grommet (seal cap) attached to the opening of the rear window glass, thereby preventing rainwater and the like from entering the back door.

JP 2008-207702 A (FIG. 1)

  However, according to the wiper motor described in Patent Document 1 described above, the length of the portion of the output shaft that protrudes from the housing and extends outside the vehicle body and is not supported by anything is relatively long. The tip side is a free end. If a large external force is applied to the tip of the output shaft in a direction intersecting the axial direction of the output shaft due to snow on the rear glass or impact when the back door is opened or closed, the output shaft will be twisted and tilted greatly. To do. In this way, when the output shaft is tilted greatly, the deformation amount of the seal cap becomes large and wears early, or a large external force is applied to the fixed part between the wiper motor and the vehicle body, and noise is generated. Problems may occur.

  An object of the present invention is to provide a wiper motor capable of preventing the output shaft from being largely tilted.

  In one aspect of the present invention, there is provided a wiper motor that swings a wiper member outside the vehicle, the housing being fixed to the inside of the vehicle body, the outside extending from the housing to the outside of the vehicle body, and the wiper member being fixed to a front end portion. An output shaft, and a tilt regulating protrusion provided between the output shaft and a communication hole through which the output shaft passes and communicates with the inside and outside of the vehicle body, and regulates the tilt of the output shaft with respect to the communication hole. Prepare.

  In another aspect of the present invention, the tilt restricting protrusion comes into contact with an inner peripheral wall of a seal cap attached to the communication hole when the output shaft tilts.

  In another aspect of the present invention, a groove extending in the circumferential direction of the tilt regulating projection is provided on the outer peripheral portion of the tilt regulating projection.

  In another aspect of the present invention, the tilt restricting protrusion is provided on the other end side of the cylindrical member having one end side attached to the housing.

  In another aspect of the present invention, the tilt restricting protrusion is provided at a distal end portion of a boss portion that is provided on the housing and rotatably supports the output shaft.

  In another aspect of the present invention, the tilt regulating protrusion is fixed to the output shaft by a retaining ring.

  According to the present invention, the tilt regulating protrusion for regulating the tilt of the output shaft with respect to the communication hole is provided between the output shaft and the communication hole through which the output shaft passes and communicates with the inside and outside of the vehicle body. As a result, even when a large external force is applied to the distal end side of the output shaft in a direction crossing the axial direction of the output shaft, the output shaft can be prevented from being greatly tilted. Therefore, it is possible to prevent the occurrence of problems such as the seal cap being greatly deformed or abnormal noise being generated from the fixed portion between the wiper motor and the vehicle body.

It is a fragmentary sectional view which shows the mounting state to the back door of the wiper motor which concerns on this invention. It is a perspective view which shows the output-shaft side of the wiper motor (with a bracket) of FIG. (A), (b) is a perspective view which shows the detailed structure of a tilt control member. (A), (b) is explanatory drawing explaining the tilting state with respect to the rear glass of an output shaft. 6 is a partial cross-sectional view showing a detailed structure of a tilt restricting member according to Embodiment 2. FIG. 6 is a partial cross-sectional view showing a detailed structure of a tilt regulating member according to Embodiment 3. FIG.

  Hereinafter, Embodiment 1 of the present invention will be described in detail with reference to the drawings.

  1 is a partial cross-sectional view showing a state where the wiper motor according to the present invention is mounted on a back door, FIG. 2 is a perspective view showing an output shaft side of the wiper motor (with a bracket) in FIG. 1, and FIGS. b) is a perspective view showing the detailed structure of the tilt regulating member.

  As shown in FIGS. 1 and 2, the wiper motor 10 swings a wiper member 12 that wipes a rear glass 11 of a vehicle such as an automobile. Here, the wiper member 12 is provided outside the vehicle, and is formed of a wiper arm 13 and a wiper blade (not shown) attached to a tip portion of the wiper arm 13.

  The wiper motor 10 includes a motor unit 20 that is an electric motor, a gear mechanism (not shown) that converts a rotational motion into a swing motion, and a gear unit 30 that includes an output shaft 31. The opening side (lower side in the figure) of the gear case (housing) 32 forming the gear portion 30 is closed by a bracket 40 for fixing the wiper motor 10 to the inner panel 15 of the back door 14. Here, the back door 14 and the inner panel 15 constitute a vehicle body in the present invention.

  The wiper motor 10 is provided inside the back door 14. The output shaft 31 of the wiper motor 10 passes through an opening 11 a provided in the rear glass 11, and the front end side of the output shaft 31 is disposed outside the back door 14. Here, the opening 11a constitutes a communication hole in the present invention, and communicates the inside and outside of the back door 14. The diameter dimension d1 of the output shaft 31 is set to be sufficiently smaller than the inner diameter dimension d2 of the opening 11a, thereby improving the workability of attaching the wiper motor 10 to the back door 14.

  On the radially inner side of the opening 11a, a seal cap (grommet) 50 formed in a substantially cylindrical shape by an elastic material such as rubber is attached by fitting. The seal cap 50 seals the gap between the output shaft 31 and the opening 11a and prevents rainwater or the like from entering the back door 14. The seal cap 50 includes a cylindrical main body 51, an output shaft sliding contact portion 52, and a curved thin portion 53.

  An inner peripheral wall 51 a is provided on the inner peripheral portion of the cylindrical main body 51, and an annular groove 51 b is provided on the outer peripheral portion of the cylindrical main body 51 along the circumferential direction thereof. The width dimension along the axial direction of the annular groove 51 b is set to be slightly smaller than the thickness dimension of the rear glass 11. Thereby, the cylindrical main body 51 is in close contact with the rear glass 11 without rattling. Further, a mounting portion 51c is provided on one axial end side (the lower side in the drawing) of the cylindrical main body 51, and this mounting portion 51c opens while being elastically deformed when the seal cap 50 is mounted on the opening 11a. 11a is passed.

  The output shaft sliding contact portion 52 is disposed on the other axial end side (upper side in the drawing) of the cylindrical main body portion 51. A plurality of lip portions (not shown) are formed on the radially inner side of the output shaft sliding contact portion 52, and these lip portions are in sliding contact with the outer peripheral portion of the output shaft 31. Thereby, sufficient sealing performance is ensured without increasing the rotational resistance of the output shaft 31.

  The curved thin portion 53 is disposed on the other axial end side of the cylindrical main body 51 and connects the cylindrical main body 51 and the output shaft sliding contact portion 52. The curved thin wall portion 53 is elastically deformed substantially without resistance as the output shaft 31 tilts with respect to the rear glass 11 and the output shaft sliding contact portion 52 moves in the radial direction with respect to the cylindrical main body portion 51. (See FIG. 4).

  The bracket 40 is formed into a substantially flat plate shape by pressing a steel plate or the like, and a bracket body 41 that closes the opening side of the gear case 32, and a pair of mounting arms 42 and 43 provided around the bracket body 41. It has. One mounting arm 42 is provided with one bolt insertion portion 42a, and the other mounting arm 43 is provided with two bolt insertion portions 43a and 43b. The bracket 40 is fixed to the inner panel 15 at three points by fixing bolts via a rubber bush (not shown). Thus, vehicle body vibration from the back door 14 is suppressed from being transmitted to the wiper motor 10, and driving vibration of the wiper motor 10 is suppressed from being transmitted to the back door 14.

  The motor unit 20 includes a motor case 21 formed into a bottomed cylindrical shape by pressing (deep drawing) a steel plate or the like, and a rotating shaft having a worm is provided inside the motor case 21. (Not shown) is rotatably accommodated. On the other hand, the gear part 30 is provided with a gear case 32 formed in a substantially bathtub shape by casting an aluminum material or the like. Inside the gear case 32, a worm wheel (not shown) meshed with a worm. Is rotatably accommodated. A gear mechanism (not shown) that converts the rotational motion of the worm wheel into the swing motion of the output shaft 31 is accommodated inside the gear case 32.

  Here, the worm and the worm wheel form a speed reduction mechanism, the rotation of the rotation shaft is reduced to a predetermined speed to increase the torque, and this increased torque is transmitted from the output shaft 31 to the wiper member 12. It is designed to output.

  The base end side (lower side in the figure) of the output shaft 31 is rotatably supported by a boss portion 34 provided integrally with the bottom portion 33 of the gear case 32. The boss portion 34 is formed in a substantially cylindrical shape, and a plurality of reinforcing ribs 34 a are provided on the outer peripheral portion of the boss portion 34. These reinforcing ribs 34 a extend radially around the boss 34 and extend in the axial direction, thereby improving the strength of the boss 34.

  The output shaft 31 extends from the boss portion 34 of the gear case 32 to the outside of the back door 14, and a serration fitting portion 31a and a male screw portion 31b are provided on the distal end side (upper side in the drawing) of the output shaft 31. It has been. The base end portion of the wiper arm 13 is fitted to the serration fitting portion 31a, and a fixing nut (not shown) is screwed to the male screw portion 31b. As a result, the wiper member 12 is fixed to the distal end portion of the output shaft 31 so as not to be relatively rotatable.

  The separation distance between the fixing portion F1 between the wiper motor 10 and the inner panel 15 and the fixing portion F2 between the output shaft 31 and the wiper member 12 is a relatively long distance L. Further, the distal end side of the output shaft 31 is a free end. Furthermore, most of the output shaft 31 within the range of the separation distance L protrudes from the boss portion 34 and is not rigidly held. Therefore, the wiper member 12 fixed to the distal end portion of the output shaft 31 has an axial direction of the output shaft 31 on the distal end side of the output shaft 31 due to snow accumulation on the rear glass 11 or an impact when the back door 14 is opened and closed. When a large external force is applied in a direction crossing the output shaft 31, the output shaft 31 is easily tilted.

  When the inclination angle of the output shaft 31 is large, the curved thin portion 53 of the seal cap 50 is particularly deformed, so that there is a risk that the curved thin portion 53 may be worn and broken early. In addition, since a large external force is also applied to the fixed portion F1 between the wiper motor 10 and the inner panel 15, the fixed portion F1 is rattled, causing abnormal noise. Therefore, in the present embodiment, a tilt regulating member 60 for regulating the tilt of the output shaft 31 with respect to the opening 11a, that is, for reducing the tilt angle of the output shaft 31, is provided.

  As shown in FIGS. 3A and 3B, the tilt regulating member 60 is formed into a substantially cylindrical shape by injection molding or the like of a resin material such as plastic, and the cylindrical member 61, the fixed cap portion 62, and the tilting are formed. A restriction protrusion 63 is provided. The cylindrical member 61 is mounted on the outer peripheral portion of the output shaft 31, and the outer peripheral portion of the output shaft 31 is in sliding contact with the radially inner side of the cylindrical member 61 (see FIG. 1). Note that sliding grease (not shown) is applied between the outer peripheral portion of the output shaft 31 and the inner peripheral portion of the cylindrical member 61 when the wiper motor 10 is assembled. Thereby, the tilt regulating member 60 does not hinder the smooth rotation of the output shaft 31.

  The fixed cap portion 62 is provided on one end side in the axial direction of the cylindrical member 61 and is formed in a substantially bowl shape as shown in FIG. As shown in FIG. 1, the fixed cap portion 62 is fixed by fitting into a mounting convex portion 34 b formed on the tip side of the boss portion 34. As a result, the tilt regulating member 60 is attached to the gear case 32, and the occurrence of rattling is suppressed.

  The tilt restricting protrusion 63 is provided on the other end side in the axial direction of the cylindrical member 61 and between the output shaft 31 and the opening 11 a, and is formed in an annular shape having a larger diameter than the cylindrical member 61. That is, the tilt restricting protrusion 63 is provided so as to protrude radially outward from the outer peripheral portion of the output shaft 31. As shown in FIG. 1, the tilt restricting protrusion 63 faces the inner peripheral portion of the opening 11 a from the radial direction, and abuts against the inner peripheral wall 51 a of the seal cap 50 when the output shaft 31 tilts greatly. It is like that. This restricts the output shaft 31 from tilting further with respect to the opening 11a.

  A groove 63 a extending in the circumferential direction of the tilt regulating projection 63 is provided on the outer peripheral portion of the tilt regulating projection 63. One (one) groove 63a is provided so as to be recessed radially inward from the outer peripheral portion of the tilt regulating protrusion 63. As described above, the groove 63a is provided on the outer peripheral portion of the tilt restricting projection 63, thereby reducing the weight of the tilt restricting member 60 and providing two contact portions between the tilt restricting projection 63 and the inner peripheral wall 51a. The surface pressure (stress concentration) on the cap 50 is dispersed.

  Next, the operation of the wiper motor 10 formed as described above, particularly the tilting of the output shaft 31, will be described in detail with reference to the drawings.

  4 (a) and 4 (b) are explanatory views for explaining a tilting state of the output shaft with respect to the rear glass.

  As shown in FIGS. 4A and 4B, the axial direction of the output shaft 31 on the distal end side of the output shaft 31 due to snow accumulation on the rear glass 11 or impact when the back door 14 (see FIG. 1) is opened and closed. When a large external force f is applied in a direction crossing the output shaft 31, the output shaft 31 is twisted. Then, as indicated by broken line arrows M1 and M2, the output shaft 31 largely tilts around the base end side (gear case 32 side). As a result, the outer peripheral portion of the tilt restricting projection 63 is brought into contact with the inner peripheral portion of the inner peripheral wall 51a, and at this time, the contact portion becomes two places by the action of the groove 63a. Distributed. Thereby, deterioration due to stress concentration of the seal cap 50 is prevented.

  Further, when the tilt regulating projection 63 abuts against the inner peripheral wall 51a, further tilting of the output shaft 31 with respect to the rear glass 11 is regulated, and the tilt angle of the output shaft 31 is compared with the conventional example indicated by a two-dot chain line in the figure. And get smaller. Thereby, the curved thin part 53 of the seal cap 50 is strongly compressed in the radial direction and is prevented from being bent forcibly. Therefore, it is possible to prevent damage that would cause the curved thin portion 53 to be broken early.

  Here, the amount of regulation of the tilt angle of the output shaft 31 by the tilt regulating projection 63, that is, the size of the gap between the tilt regulating projection 63 and the inner peripheral wall 51a is, for example, the wiper motor 10 and the inner panel 15 (see FIG. 1). It is desirable to set according to the elastic deformation allowable amount of the rubber bush. Thereby, the excessive inclination of the wiper motor 10 with respect to the inner panel 15 is suppressed, and damage to the fixing bolt in the fixing portion F1 between the wiper motor 10 and the inner panel 15 can be prevented.

  As described above in detail, according to the wiper motor 10 according to the present embodiment, the output shaft 31 is disposed between the output shaft 31 and the opening 11a through which the output shaft 31 penetrates and communicates with the inside and outside of the back door 14. A tilt restricting protrusion 63 for restricting tilt with respect to the opening 11a is provided. As a result, even if a large external force f is applied to the distal end side of the output shaft 31 in a direction crossing the axial direction of the output shaft 31, the output shaft 31 can be prevented from being tilted greatly. Therefore, it is possible to prevent the occurrence of problems such as the seal cap 50 being greatly deformed or abnormal noise being generated from the fixing portion F1 between the wiper motor 10 and the inner panel 15.

  Further, according to the wiper motor 10 according to the present embodiment, when the output shaft 31 tilts, the tilt restricting projection 63 contacts the inner peripheral wall 51a of the seal cap 50 attached to the opening 11a. It is possible to prevent the opening 11a and the tilt restricting protrusion 63 from being damaged while suppressing the occurrence of the collision noise.

  Furthermore, according to the wiper motor 10 according to the present embodiment, since the tilt restriction projection 63 is provided on the other end side of the cylindrical member 61 attached to the gear case 32 of the wiper motor 10, the tilt restriction projection 63 is It can be easily arranged at a specified position along the axial direction of the output shaft 31.

  Next, Embodiment 2 of the present invention will be described in detail with reference to the drawings. Note that portions having the same functions as those in the first embodiment described above are denoted by the same reference numerals, and detailed description thereof is omitted.

  FIG. 5 is a partial cross-sectional view showing a detailed structure of the tilt regulating member according to the second embodiment.

  As shown in FIG. 5, the wiper motor 70 according to the second embodiment is different in that the tilt regulating member 80 is integrated with the boss portion 34 of the gear case 32. Specifically, the tilt regulating member 80 includes a boss extension cylinder 34c in which the tip end side of the boss portion 34 extends toward the rear glass 11, and an axial other end side (upper side in the drawing) of the boss extension cylinder 34c. It is comprised from the tilting control protrusion 81 arrange | positioned. Here, the tilt restricting protrusion 81 is formed in an annular shape having a larger diameter than the boss extension cylinder 34c, and is provided integrally with the other end side in the axial direction of the boss extension cylinder 34c, that is, at the tip of the boss extension cylinder 34c. . Therefore, the tilt restricting protrusion 81 in the second embodiment is formed of the same aluminum material as that of the gear case 32.

  A groove 81 a extending in the circumferential direction of the tilt regulating projection 81 is provided on the outer peripheral portion of the tilt regulating projection 81. Two (two) grooves 81 a are provided so as to be recessed radially inward from the outer peripheral portion of the tilt regulating protrusion 81. Thus, by providing the groove 81a on the outer peripheral portion of the tilt regulating projection 81, the contact between the tilt regulating projection 81 and the inner circumferential wall 51a is set at three locations while reducing the weight of the tilt regulating member 80, and the seal. The surface pressure (stress concentration) on the cap 50 is dispersed.

  Since the boss extension cylinder 34c is formed of an aluminum material or the like, the output shaft 31 cannot be directly pivotally supported. Therefore, in the present embodiment, bushes (radial bearings) 82 are respectively attached to both ends in the axial direction of the boss extension cylinder 34c. Thereby, the smooth rotation of the output shaft 31 with respect to the boss extension cylinder 34c is permitted.

  In the wiper motor 70 according to the second embodiment formed as described above, the same operational effects as those of the first embodiment described above can be obtained. In addition, in the second embodiment, since the tilt regulating member 80 is formed of an aluminum material or the like, the rigidity of the tilt regulating member 80 can be increased. Therefore, the inclination angle of the output shaft 31 can be further reduced. However, by increasing the rigidity of the tilt regulating member 80, a large load is likely to be applied to the fixed portion between the wiper motor 70 and the inner panel 15 (see FIG. 1). Therefore, it is desirable that the rubber bush between the wiper motor 70 and the inner panel 15 has a large elastic deformation allowance.

  Next, Embodiment 3 of the present invention will be described in detail with reference to the drawings. Note that portions having the same functions as those in the first embodiment described above are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 6, the wiper motor 90 according to the third embodiment is different in that the tilt regulating member 100 is configured by the tilt regulating projection 101 alone. Specifically, the tilt restricting protrusion 101 is formed in an annular shape having a larger diameter than the output shaft 31 with an aluminum material or the like, and is mounted on the outer peripheral portion of the output shaft 31. The tilt restricting projection 101 is positioned and fixed along the axial direction of the output shaft 31 by a pair of retaining rings 102 respectively mounted on a pair of fixing grooves 31 c on the outer peripheral portion of the output shaft 31. Here, as the pair of retaining rings 102, although not shown in detail, a C-shaped retaining ring, an E-shaped retaining ring, or the like is employed.

  The outer shape of the tilt regulating projection 101 is the same as that of the tilt regulating projection 63 in the first embodiment, and a groove 63a similar to that in the first embodiment is provided on the outer periphery of the tilt regulating projection 101. ing. However, the material of the tilt restricting protrusion 101 is not limited to an aluminum material or the like, and a resin material such as polyacetal (POM) can also be used.

  In the wiper motor 90 according to the third embodiment formed as described above, the same operational effects as those of the first embodiment described above can be obtained. In addition to this, in the second embodiment, the tilt restricting projection 101 is fixed to the output shaft 31 and rotated together with the output shaft 31, so that the output is higher than in the first and second embodiments. The rotational resistance of the shaft 31 can be reduced. Further, by holding sliding grease (not shown) in the groove 63a of the tilt regulating projection 101, the output shaft 31 can be smoothly rotated even when the tilt regulating projection 101 and the inner peripheral wall 51a are in contact with each other. Can be moved.

  It goes without saying that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, in the above-described embodiment, the wiper motor 10 is applied to a drive source of a rear wiper device of a vehicle such as an automobile. However, the present invention is not limited to this, and a front surface for wiping a windshield of a vehicle such as an automobile is shown. It can also be applied to a drive source of a wiper device.

10 Wiper motor 11 Rear glass 11a Opening (communication hole)
12 Wiper member 13 Wiper arm 14 Back door (vehicle body)
15 Inner panel (car body)
20 Motor part 21 Motor case 30 Gear part 31 Output shaft 31a Serration fitting part 31b Male thread part 31c Fixed groove 32 Gear case (housing)
33 Bottom part 34 Boss part 34a Reinforcement rib 34b Mounting convex part 34c Boss extension cylinder 40 Bracket 41 Bracket main body 42, 43 Mounting arm 42a, 43a, 43b Bolt insertion part 50 Seal cap 51 Cylindrical main body part 51a Inner peripheral wall 51b Annular groove 51c Attachment Part 52 Output shaft sliding contact part 53 Curved thin part 60 Tilt restricting member 61 Cylindrical member 62 Fixed cap part 63 Tilt restricting protrusion 63a Groove 70 Wiper motor 80 Tilt restricting member 81 Tilt restricting protrusion 81a Groove 90 Wiper motor 100 Tilt restricting member 101 Tilt restricting member 101 Protrusion 102 Retaining ring F1, F2 Fixed part f External force

Claims (6)

A wiper motor that swings a wiper member outside the vehicle,
A housing fixed to the inside of the vehicle body;
An output shaft extending from the housing to the outside of the vehicle body, and having the wiper member fixed to a tip portion;
A tilt regulating protrusion provided between the output shaft and a communication hole through which the output shaft penetrates and communicates with the inside and outside of the vehicle body, the tilt regulating protrusion regulating the tilt of the output shaft with respect to the communication hole;
A wiper motor comprising: The wiper motor according to claim 1,
The tilt control protrusion is a wiper motor that is brought into contact with an inner peripheral wall of a seal cap attached to the communication hole when the output shaft tilts. The wiper motor according to claim 2,
The wiper motor which provided the groove | channel extended in the circumferential direction of the said tilt control protrusion in the outer peripheral part of the said tilt control protrusion. The wiper motor according to any one of claims 1 to 3,
The wiper motor which provided the said inclination control protrusion in the other end side of the cylindrical member with which one end side is mounted | worn with the said housing. The wiper motor according to any one of claims 1 to 3,
A wiper motor, wherein the tilt restricting protrusion is provided at a distal end portion of a boss portion provided on the housing and rotatably supporting the output shaft. The wiper motor according to any one of claims 1 to 3,
The wiper motor which fixed the said inclination control protrusion to the said output shaft with the retaining ring.

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