JP5546902B2 - Movement detector - Google Patents

Description

  The present invention relates to a movement detection device used for detecting movement amounts of mechanisms of various devices such as an opening / closing amount of a valve provided in an exhaust gas recirculation device of an internal combustion engine and an opening / closing amount of a valve for mixing fuel and air. About.

  Patent Document 1 below discloses a linear operation type movement detection device mounted on an automobile. In this movement detection device, an operation shaft that protrudes to the outside of the case is supported linearly and reciprocally on a bearing portion provided on the case. Housed in the case are a movable member that is pushed by the operating shaft and moves linearly, and a coil spring that applies a biasing force in a direction that causes the operating shaft to protrude from the movable member. An insulating substrate having a resistor on the surface is provided inside the case, and a slider for sliding the resistor is provided on the movable member.

  When a force such as pedal operation of an automobile acts on the operation shaft, the movable member inside the case is pushed by the operation shaft, and the amount of movement of the movable member is detected according to the contact position between the slider and the resistor.

  In this type of movement detection device, if the movable member rattles inside the case, the positions of the operation shaft and the movable member cannot be accurately detected, and detection errors tend to occur. Further, if the movable member rattles in the case due to external acceleration, not only the position detection will be hindered but also erroneous feedback information may be transmitted to the control unit of the automobile.

  In the invention described in Patent Document 1, a structure in which a leaf spring bent in a V shape is interposed between the case and the movable member to prevent rattling of the movable member, and a coil spring provided in the case. A structure is disclosed in which a moment is given to the movable member to prevent the movable member from rattling.

  However, a simple bent leaf spring has a drawback that it is difficult to apply a uniform pressing force to the movable member, and the resistance force when the movable member moves increases. In addition, in the structure in which a moment is applied to the movable member, it is difficult to effectively suppress the rattling of the movable member.

JP 2002-115567 A

  The present invention solves the above-described conventional problems, and can improve the effect of preventing rattling of a moving member that moves linearly in the housing, and can move the moving member smoothly and linearly in the housing. An object of the present invention is to provide a movable detection device.

The present invention provides a movement detection device in which a moving member that linearly reciprocates and a detection unit that detects the movement of the moving member are provided inside the housing.
A first guide portion on which the moving member slides and a second guide portion on which a leaf spring provided on the moving member slides are formed in the housing,
The leaf spring includes a pressing plate portion that presses the moving member against the first guide portion, a sliding plate portion that slides on the second guiding portion, the pressing plate portion, and the sliding plate portion. An intermediate plate portion positioned between the first plate, the first bending portion connecting the pressing plate portion and the intermediate plate portion, and a second bending portion connecting the sliding plate portion and the intermediate plate portion. Are formed integrally, and the first curved portion and the second curved portion are positioned away from each other in the moving direction of the moving member, and the leaf spring guides the moving member to the first guide. The pressing force to be pressed toward the portion is substantially equal at the front end portion and the rear end portion of the leaf spring,
A spring member that urges the moving member in one direction is provided in the housing, and the movement is performed between the front end portion and the rear end portion of the leaf spring from the spring member to the moving member. A moment acting to press the member toward the first guide portion is acting .

  In the movement detecting device of the present invention, the leaf spring located between the first guide part and the moving member is bent by two curved parts, and the two curved parts are positioned with an interval in the moving direction of the moving member. ing. Therefore, a uniform pressing force acts on the moving member in a region spaced in the moving direction, and the moving part can move smoothly without rattling in the housing.

In the present invention, the sliding plate portion has an end side facing the side opposite to the second curved portion, and the end side is bent in a direction away from the second guide portion. Those are preferred.
In the above structure, the sliding resistance between the end side of the sliding plate portion of the leaf spring and the second guide portion can be reduced.

  In the present invention, the leaf spring includes two sets of urging function portions in which the pressing plate portion, the sliding plate portion, and the first bending portion and the second bending portion are integrally formed. And two sets of the said urging | biasing function part can be comprised as what is arrange | positioned away in the direction orthogonal to the moving direction of the said moving member.

  In the above-described structure, the moving member is pressed at two locations spaced in the direction crossing the moving direction by the two sets of urging function units, so that the moving member can move in a stable posture.

  For this purpose, in the present invention, it is preferable that the two first guide portions and the two second guide portions are arranged apart in a direction orthogonal to the moving direction of the moving member.

  In the present invention, it is preferable that the two first guide portions are formed to be inclined symmetrically with respect to the left-right direction.

  By tilting the first guide portions arranged on the left and right sides, the moving member can be held in the housing without rattling from side to side.

  In the present invention, the detection unit is arranged on the side where the moving member is pressed by the leaf spring.

  For example, the detection unit includes a detection substrate that extends along a moving direction of the moving member, and an elastic slider that is fixed to the moving member and slides on the surface of the detection substrate, and the movement The member is urged by the leaf spring in the direction opposite to the elastic reaction force of the elastic slider.

In this case, the elastic reaction force of the elastic slider acts on the moving member in the direction of canceling the moment from the spring member between the front end portion and the rear end portion of the leaf spring. Preferably it is.

When the elastic reaction force of the elastic slider acts on the moving member between the front end portion and the rear end portion , it becomes easy to prevent unnecessary tilting force from being applied to the moving member due to the repulsive force of the elastic guide portion.

  For example, in the present invention, a transmission shaft that is moved by an external mechanism is slidably provided in the housing, and the moving member is moved in a direction that opposes the biasing force of the spring member by the transmission shaft. Is.

  The movement detection device of the present invention can easily prevent rattling of the moving member in the housing, and can reduce the resistance force when the moving member moves linearly in the housing. Therefore, the moving member can move linearly in a stable posture within the housing.

The longitudinal cross-sectional view which shows the movement detection apparatus of embodiment of this invention, Sectional drawing which cut | disconnected the movement detection apparatus by the II-II line | wire of FIG. An exploded perspective view showing the internal structure of the housing of the movement detecting device; The side view which expands and shows a moving member and a leaf spring,

  1 to 4, the X1 direction is the front, the X2 direction is the rear, the Z1 direction is the upward direction, the Z2 direction is the downward direction, and the Y1-Y2 direction is the left-right direction.

  The movement detection device 1 has a housing 10. The housing 10 is made of a light metal such as aluminum, or is made of a synthetic resin material. A metal or synthetic resin bearing 11 is fixed to the front portion of the housing 10, and a transmission shaft 12 is inserted into the bearing hole 11a. The transmission shaft 12 is a shaft made of a metal shaft or a synthetic resin material, extends from the inside of the housing 10 to the outside, and is supported so as to be linearly movable in the X1-X2 direction.

  The transmission shaft 12 detects the opening degree of the control valve 2 of the internal combustion engine, and is moved in the X1-X2 direction according to the opening degree of the control valve 2. The control valve 2 is for controlling the circulation amount of the exhaust gas in the exhaust gas recirculation device (EGR) of the internal combustion engine. Or it is a mixing valve which mixes fuel and air. The control valve 2 is opened / closed by the power of the motor or the like according to a command from a control unit provided in the automobile, and the force of the opening / closing operation is transmitted to the transmission shaft 12 to move the transmission shaft 12 in the X1-X2 direction. It is done.

  As shown in FIGS. 1 and 2, a moving space 10a is formed inside the housing 10, and a rear portion of the transmission shaft 12 moves inside the moving space 10a. A moving member 13 is provided in the moving space 10a so as to be capable of reciprocating in the X1-X2 direction. The moving member 13 is made of a light metal material or a synthetic resin material.

  A spring member 14 is provided on the upper portion of the moving space 10a on the Z1 side. The spring member 14 is a compression coil spring. The housing 10 is integrally formed with a support protrusion 10b that protrudes in the X1 direction toward the inside of the moving space 10a, and a spring member 14 is mounted on the outer periphery of the support protrusion 10b. A pressed portion 13 a extending upward is integrally provided at the tip of the moving member 13.

  As shown in FIG. 1, the spring member 14 is compressed and mounted between the inner wall portion 10c behind the moving space 10a and the pressed portion 13a. The moving member 13 is urged forward (X1 direction) by the elastic force of the spring member 14. Since the elastic force of the spring member 14 is applied to the pressed portion 13 a that extends upward at the tip of the moving member 13, a counterclockwise moment M in FIG. 1 is applied from the spring member 14 to the moving member 13.

  As shown in FIG. 1, a recess 13b is formed at the front end of the moving member 13, and the rear end of the transmission shaft 12 is inserted into the recess 13b. The rear end portion of the transmission shaft 12 is not constrained by the concave portion 13b, and the inner wall portion 13c on the X2 side of the concave portion 13b is abutted against the rear end surface 12a of the transmission shaft 12. The moving member 13 is biased in the X1 direction by the spring member 14, and the inner wall portion 13c is abutted against the rear end surface 12a by the biasing force. When the transmission shaft 12 moves in the X1-X2 direction, the moving member 13 is also moved in the X1-X2 direction following this.

  As shown in FIG. 2, the moving space 10a formed in the housing 10 has a symmetrical shape on the left and right with a center plane OO that bisects the left-right direction (Y1-Y2 direction).

As shown in FIG. 2, first guide portions 16 are formed on the left and right sides of the lower part of the moving space 10a. The first guide portions 16 and 16 are formed at positions that are separated from the center plane OO by a distance equal to the left and right, and are also formed at the same height in the vertical direction (Z1-Z2 direction). The first guide parts 16 and 16 are formed at the same height and continuously in the front-rear direction within the movement range of the moving member 13 in the X1-X2 direction. However, as shown in FIG. 2, the cross-sectional shapes of the two first guide portions 16 and 16 are both inclined surfaces that are directed downward toward the center plane OO.

  As shown in FIG. 2, the moving member 13 is formed with downward sliding portions 13d and 13d at positions spaced left and right across the center plane OO. The cross-sectional shapes of the sliding portions 13d and 13d are inclined surfaces that face downward toward the center plane OO. The moving member 13 is regulated so that the sliding portions 13d and 13d are in contact with the first guide portions 16 and 16 so as not to move in the left-right direction (Y1-Y2 direction), and the sliding portions 13d and 13d. However, the movable member 13 reciprocates in the front-rear direction (X1-X2) direction by sliding on the first guide portions 16 and 16.

  As shown in FIG. 2, a detection space 10d is formed in the housing 10 further below the moving space 10a. The detection space 10 d is located between the two first guide portions 16 and 16 and is formed further below the two first guide portions 16 and 16.

  A detection unit 20 is provided in the detection space 10d. The detection unit 20 has a detection substrate 21. As shown in FIG. 2, the detection board 21 can move a little in the vertical direction (Z1-Z2 direction) within the detection space 10d. A leaf spring is interposed as a cushion material 22 between the bottom surface 10 e of the detection space 10 d and the lower surface of the detection substrate 21. The detection board 21 is biased upward by the cushion material 22, and the upper surface of the detection board 21 is abutted against a positioning portion 10 f formed in the housing 10.

  As shown in FIG. 3, the resistor pattern 23 and the lead electrode pattern 24 are connected to each other on the upper surface 21 a of the detection substrate 21. Both patterns 23 and 24 are formed continuously in the X1-X2 direction. On the side of the resistor pattern 23, a detection lead pattern 25 is formed continuously in the X1-X2 direction in parallel with the resistor pattern 23. A land portion 23a for applying voltage is formed at the end portion of the resistor pattern 23 on the X1 side, and a land portion 24a for grounding is formed at the end portion of the lead electrode pattern 24 on the X1 side. A detection land 25a is formed at the end of the X1 side.

  As shown in FIG. 1, three terminal plates 26 are embedded in the lower portion of the housing 10, and each terminal plate 26 and each of the land portions 23 a, 24 a, and 25 a are individually metal clips 27. Connected and conductive.

  As shown in FIGS. 1 and 3, a contact plate 28 is fixed to the lower surface of the moving member 13. The contact plate 28 is made of a conductive metal leaf spring material. The contact plate 28 is integrally formed with two elastic sliders 28a, 28a extending in the X1 direction. One elastic slider 28 a slides on the resistor pattern 23 formed on the detection substrate 21, and the other elastic slider 28 a slides on the detection lead pattern 25.

  As shown in FIG. 2, downward second guide portions 17 and 17 are formed at two places on the ceiling surface of the moving space 10 a of the housing 10. The second guide portions 17 and 17 are formed at the same distance in the left-right direction (Y1-Y2 direction) across the center plane OO. The two second guide portions 17 and 17 are at the same height position in the vertical direction (Z1-Z2 direction), and are formed perpendicular to the center plane OO and parallel to the XY plane. The second guide parts 17, 17 extend linearly in the front-rear direction. Each of the second guide portions 17 faces the upper side of the first guide portion 16.

  As shown in FIG. 3, a leaf spring 30 is fixed to the upper part of the moving member 13. The leaf spring 30 is formed of a spring metal plate material such as a stainless spring steel plate or a phosphor bronze plate.

  The leaf spring 30 is integrally formed with a fixed plate portion 31 and two urging function portions 32 and 32. The fixed plate portion 31 has a flat plate shape parallel to the XY plane, and a pair of fixed holes 31a are opened. Fixed protrusions 13e and 13e are formed on the upper surface 13g of the moving member 13 so as to face upward. The fixing plate portion 31 is installed on the upper surface 13g of the moving member 13, and each fixing hole 31a is inserted into the fixing projection 13e, and the fixing projection 13e is deformed, so that the caulking portion shown in FIGS. 13f is formed. The fixed plate portion 31 is fixed to the upper surface 13g of the moving member 13 by the caulking portion 13f.

  As shown in FIG. 2, the urging function portions 32 and 32 provided on the leaf spring 30 are arranged at an equal distance from the center plane OO in the left-right direction (Y1-Y2 direction).

  The two urging function parts 32 and 32 have the same structure. The two urging function parts 32, 32 are respectively a pressing plate part 33 located at the lower part, a sliding plate part 34 located at the upper part, and an intermediate part located between the pressing plate part 33 and the sliding plate part 34. A plate portion 35 is provided. The front end of the pressing plate portion 33 and the front end of the intermediate plate portion 35 are connected by a first curved portion 36, and the rear end of the sliding plate portion 34 and the rear end of the intermediate plate portion 35 are connected by a second curved portion 37. ing.

  As shown in FIGS. 2 and 4, the pressing plate portions 33 and 33 of the respective urging function portions 32 are installed on the left and right side portions of the upper surface 13g of the moving member 13, and the sliding plate portions 34 and 34 are housings. 10 abuts on the second guide portions 17, 17 formed on the base plate 10. The urging function part 32 is sandwiched between the upper surface 13g of the moving member 13 and the second guide part 17 in a state compressed up and down, and the moving member 13 is pressed downward by the pressing plate part 33. The sliding plate portion 34 is pressed against the second guide portion 17.

  The pressing plate portion 33, the sliding plate portion 34, and the intermediate plate portion 35 have an elongated shape in which the length dimension in the front-rear direction (X1-X2 direction) is longer than the width dimension in the left-right direction (Y1-Y2 direction). The first bending portion 36 and the second bending portion 37 are formed with a distance in the front-rear direction, have the same curvature, and have the same elastic force. As shown in FIG. 4, when the biasing function part 32 is sandwiched between the upper surface 13 g of the moving member 13 and the second guide part 17, the first bending part 36 and the second bending part 37 are deformed. Thus, the pressing plate portion 33, the sliding plate portion 34, and the intermediate plate portion 35 are parallel to each other. In a free state where the urging function portion 32 is not mounted between the moving member 13 and the second guide portion 17, the pressing plate portion 33, the sliding plate portion 34, and the intermediate plate portion 35 are not parallel to each other, The rear end side 33a of the pressing plate portion 33 and the front end side 34a of the sliding plate portion 34 are separated from each other in the vertical direction as compared with FIG.

  As shown in FIGS. 3 and 4, the front end portion 38 of the sliding plate portion 34 is curved, and the front end side 34 a of the sliding plate portion 34 is deformed in a direction away from the second guide portion 17. It has been.

  In contrast to the illustrated embodiment, the first bending portion 36 may be directed backward (X2 direction), and the second bending portion 37 may be directed forward (X1 direction).

Next, the operation of the movement detection device 1 will be described.
As the control valve 2 shown in FIG. 1 is opened and closed, the transmission shaft 12 moves in the X1 direction or the X2 direction. Since the moving member 13 in the housing 10 is pressed against the rear end surface 12a of the transmission shaft 12 by the spring member 14, the moving member 13 moves in the X1-X2 direction following the movement of the transmission shaft 12.

  As shown in FIG. 1, the contact portion between the pressed portion 13 a and the spring member 14 formed on the moving member 13 is provided in front of and above the moving member 13. As a result, a counterclockwise moment M acts on the moving member 13 by the spring member 14, and the moving member 13 is pushed downward by this moment M.

  Further, the two urging function portions 32 and 32 of the leaf spring 30 push both side portions of the moving member 13 in the left-right direction (Y1-Y2 direction) downward. As shown in FIG. 4, in each biasing function part 32, the width, thickness, and curvature of the leaf spring are the same in the first bending part 36 and the second bending part 37 that are separated forward and backward. . Therefore, the elastic moment Ma exerted by the restoring force of the first bending portion 36 and the elastic moment Mb exerted by the restoring force of the second bending portion 37 in the mounted state are opposite in direction and have almost absolute values. The same. Therefore, the pressing force Fa that the front end portion of the urging function portion 32 pushes the moving member 13 downward is substantially the same as the pressing force Fb that the rear end portion pushes the moving member 13 downward.

  The length dimension L before and after the urging function part 32, that is, the length dimension L between the front end of the first bending part 36 and the rear end of the second bending part 37 shown in FIG. 80% or more of the length dimension, and preferably the lengths of both are substantially equal. Further, it is more preferable that the length L is sufficiently larger than the length before and after the moving member 13. Therefore, the sliding portion 13d of the moving member 13 is pressed with a substantially uniform force against the first guide portion 16 of the housing 10 in the longitudinal range.

  As shown in FIG. 1, the contact portion between the spring member 14 and the pressed portion 13 a is within the range of the length L of the biasing function portion 32. Therefore, even if the moment M acts, the moving member 13 is less likely to tilt in the direction of the moment M, and the moving member 13 is likely to move back and forth in a stable posture. Further, the contact reaction force between the elastic slider 28 a and the detection substrate 21 also acts within the range of the length L of the urging function portion 32. Therefore, the posture of the moving member 13 is not easily tilted by the contact reaction force of the elastic slider 28a.

  The contact portion between the spring member 14 and the pressed portion 13a, which is the action portion of the moment M, and the contact reaction force action portion of the elastic slider 28a are both within the range of the length L of the biasing function portion 32. In the range of the length L, the moment M and the contact reaction force of the elastic slider 28a act in the canceling direction. Accordingly, the moving member 13 is pressed against the first guide portion 16 mainly by the elastic force of the urging function portion 32, and the influence of the moment M and the contact reaction force of the elastic slider 28a on the moving member 13 is extremely high. small.

  As shown in FIG. 2, the urging function part 32 of the leaf spring 30 is located apart in the left-right direction (Y1-Y2 direction), so that the sliding parts 13 d formed on the left and right sides of the moving member 13, 13d is pressed against the first guide portions 16 and 16 with the same force. Since the first guide portions 16 and 16 are inclined surfaces that are inclined downward toward the center plane OO, the moving member 13 is moved in the left-right direction (Y1-Y2 direction) by the pressing force of the urging function portion 32. Moves back and forth in a stable posture.

As shown in FIG. 2, the pressing force of the spring member 14 acts on the moving member 13 on the center plane OO, and at the same distance on both the left and right sides of the center plane OO, A pressing force is applied from the urging function units 32 and 32. Further, tapered first guide portions 16 and 16 are formed at positions facing the place where the pressing force of the urging function portions 32 and 32 acts. Therefore, the moving member 13 is supported in a balanced manner in the left-right direction (Y1-Y2 direction) inside the housing 10 and can move. Therefore, when acceleration is applied from the outside, it becomes easy to prevent the moving member 13 from rattling in the left-right direction , and a stable detection output can be obtained.

  When the moving member 13 moves back and forth within the moving space 10 a of the housing 10, the sliding plate portion 34 of each biasing function portion 32 slides on the second guide portions 17 and 17. As shown in FIG. 4, since the sliding plate portion 34 is long in the front-rear direction and the sliding plate portion 34 contacts the second guide portion 17 with uniform pressure, the sliding plate portion 34 and the second guide are in contact with each other. The frictional resistance with the portion 17 is reduced. Moreover, since the 2nd curved part 37 is formed in the rear part of the sliding plate part 34, and the front-end part 38 is also curved, the frictional resistance of the sliding plate part 34 and the 2nd guide part 17 is also small.

  When the moving member 13 moves back and forth in a stable posture following the movement of the transmission shaft 12, the elastic sliders 28a and 28a slide on the resistor pattern 23 and the detection lead pattern 25 of the detection substrate 21, The resistance value accurately changes in accordance with the movement position of the transmission shaft 12 and the moving member 13, and a voltage change proportional to the change in the resistance value is obtained with high accuracy as the detection output.

  As shown in FIG. 1, the lower surface of the detection substrate 21 is supported by a cushion material 22. When a large pressing force is temporarily applied to the detection substrate 21 from the elastic sliders 28a, 28a, the detection substrate 21 is elastically supported by the cushion material 22, so that an excessive force is applied to the resistor pattern 23. Can be prevented. Further, when a large pressing force is temporarily applied to the detection substrate 21 from the elastic sliders 28a, 28a, the moving posture of the moving member 13 is hardly affected by the reaction force.

  In addition, the movement detection apparatus of this invention is not restricted to the thing in which the detection part 20 has a resistor pattern, The magnet was provided in one of the moving member and the housing, and the magnetic sensor was provided in the other. . Alternatively, an optical detection device may be provided.

DESCRIPTION OF SYMBOLS 1 Movement detection apparatus 2 Control valve 10 Housing 10a Movement space 10d Detection space 12 Transmission shaft 13 Moving member 13a Pressed part 13d Sliding part 14 Spring member 16 1st guide part 17 2nd guide part 20 Detection part 21 Detection board 28a Elastic slider 30 Leaf spring 31 Fixed plate portion 32 Energizing function portion 33 Pressing plate portion 34 Sliding plate portion 34a Front end side 35 Intermediate plate portion 36 First bending portion 37 Second bending portion

Claims (9)

In the movement detection apparatus provided with a moving member that linearly reciprocates inside the housing and a detection unit that detects the movement of the moving member,
A first guide portion on which the moving member slides and a second guide portion on which a leaf spring provided on the moving member slides are formed in the housing,
The leaf spring includes a pressing plate portion that presses the moving member against the first guide portion, a sliding plate portion that slides on the second guiding portion, the pressing plate portion, and the sliding plate portion. An intermediate plate portion positioned between the first plate, the first bending portion connecting the pressing plate portion and the intermediate plate portion, and a second bending portion connecting the sliding plate portion and the intermediate plate portion. Are formed integrally, and the first curved portion and the second curved portion are positioned away from each other in the moving direction of the moving member, and the leaf spring guides the moving member to the first guide. The pressing force to be pressed toward the portion is substantially equal at the front end portion and the rear end portion of the leaf spring,
A spring member that urges the moving member in one direction is provided in the housing, and the movement is performed between the front end portion and the rear end portion of the leaf spring from the spring member to the moving member. A movement detecting device characterized in that a moment acting to press a member toward the first guide portion is acting .   The said sliding plate part has an edge which faces to the opposite side to the said 2nd curved part, and the said edge is bent in the direction away from the said 2nd guide part. Movement detection device.   The leaf spring is formed with two sets of urging function portions in which the pressing plate portion, the sliding plate portion, and the first bending portion and the second bending portion are integrally formed. The movement detecting device according to claim 1, wherein the urging function unit is disposed away from the moving member in a direction orthogonal to a moving direction of the moving member.   The movement detection device according to claim 3, wherein the two first guide parts and the two second guide parts are arranged apart from each other in a direction orthogonal to a moving direction of the moving member.   The movement detection device according to claim 4, wherein the two first guide portions are formed to be symmetrically inclined with respect to the left-right direction.   The movement detection device according to claim 1, wherein the detection unit is arranged on a side where the moving member is pressed by the leaf spring.   The detection unit includes a detection substrate that extends along a moving direction of the moving member, and an elastic slider that is fixed to the moving member and slides on the surface of the detection substrate. The movement detection device according to claim 6, wherein the leaf spring is biased in the direction opposite to the elastic reaction force of the elastic slider. The elastic reaction force of the elastic slider acts on the moving member in a direction that cancels the moment from the spring member in the middle of the front end portion and the rear end portion of the leaf spring. The movement detection device described. The movement according to claim 8 , wherein a transmission shaft that is moved by an external mechanism is slidably provided in the housing, and the movement member is moved in a direction that opposes the biasing force of the spring member by the transmission shaft. Detection device.

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