JP6552906B2 - Tabletop wet road surface forming device - Google Patents

Description

  The present invention relates to a vehicle such as an automobile or another moving object or a device for running a tire, and more specifically, a water film is formed on a simulated road surface on a table to reproduce a wet road surface. The present invention relates to a bench wet road surface forming apparatus for testing a state of a moving body tire.

  A table tire that performs a tire test on a simulated road surface on a table in order to investigate the characteristics of a vehicle such as an automobile or other moving body (hereinafter referred to as “vehicle or the like”) in the running state of the tire. Test equipment is used. In such an on-board tire testing apparatus, in particular, an apparatus for forming a water film on a simulated road surface (wet road surface forming apparatus) in order to inspect the condition or characteristics of a tire on a road surface wet with water. May be provided. As such a wet road surface forming device, for example, in Patent Document 1, a test device using a flat endless belt as a simulated road surface, in which a tire is rotated on the belt while moving the belt. In this apparatus, a configuration is disclosed in which a water spray nozzle extending in the width direction of the belt is arranged on the upstream side of the belt, and water is jetted onto the belt. In this case, the gap between the water spray nozzle and the belt can be adjusted by a spring or the like. Further, in Patent Document 2, in a test apparatus that rotates a tire on a flat disk, a cylindrical inner surface or a flat endless belt, and rotates the tire on the simulated road surface, water is supplied upstream of the simulated road surface. A means for supplying water, a means for adjusting the thickness of the water film by passing the pseudo road surface supplied with water through an adjustable gap, and a means for detecting the thickness of the adjusted water film. The structure which controls the thickness of the water film formed in this way is disclosed (the thickness of the water film is detected by using a diffuse reflection type and a regular reflection type laser displacement meter). In Patent Document 3, in the means for forming a water film on the pseudo road surface, the channel length of the nozzle for supplying water is at least 10 times or more of the nozzle gap (the size of the opening of the nozzle); It describes that the water pressure supplied from the nozzle and the amount of water are adjusted. Further, in Patent Document 4, a device using a vertical upper surface of an annular body whose rolling direction is in a horizontal plane as a pseudo road surface, the width direction (of the annular body on the vertical upper surface of the annular body). There is disclosed a mechanism for supplying water over the direction perpendicular to the moving direction to form a water film.

Japanese Patent Application Publication No. 2006-208265 JP2008-175757 JP, 2009-12, 1998 JP 2008-196912 A

  When a water film is formed on the upper surface b of the simulated road surface 3 on the table, as schematically illustrated in FIG. 1A, using the above-described wet table surface forming apparatus on the table, The width of the water film Wm in the direction perpendicular to the rotation direction of the tire T, that is, the width direction of the simulated road surface is wider than the width of the tire T to be tested, and the thickness or depth of the water film is tested. It is desired to be substantially uniform around the subject tire. Therefore, in order to eject a wide and substantially uniform water film flow onto such a simulated road surface, typically, the tip portion of the water jet nozzle 4 of the tabletop wet road surface forming device 1 is formed on the simulated road surface. As shown in the upper part of FIG. 3 (A), the open end 4a has a broad channel in which the opening end 4a extends in parallel to the width direction of the pseudo road surface. It is formed in a rectangular structure, and as shown in the lower part of FIG. 3A, the water film flows out substantially uniformly in the width direction on the pseudo road surface.

  With respect to the tip portion of the water jet nozzle 4 as described above, when the shape and dimensions of the opening end of the water jet nozzle are unchanged as depicted in the upper part of FIG. 3A, the cross-sectional area of the water flow ejected from the opening end Also, when changing the thickness of the water film, in order to adjust the amount of water flowing out per unit time from the open end, the flow rate at the open end will be changed. Since the flow rate of the water film on the simulated road surface also changes, adjustment can be complicated (where the flow rate is the volume of water ejected from the open end per unit time, and the flow rate is It is the distance traveled by water per unit time.) In addition, for example, when the flow rate of water ejected from the water jet nozzle opening end 4a is increased for the purpose of obtaining a desired water film thickness or flow velocity, the water pressure is increased, thereby causing the opening end 4a of FIG. When viewed from the side, the upper plate 5U and the lower plate 5L of the water jet nozzle 4 bend in the direction away from each other, and the flow velocity and / or thickness of the water film in the width direction on the simulated road surface may be uneven (see FIG. In this regard, for example, as illustrated in Patent Document 3 above, the upper plate 5U and the lower plate 5L are connected between both ends of the water jet nozzle 4 as illustrated in FIG. 3C. When several partition walls 4x are provided at an appropriate interval, it is possible to avoid bending of the upper plate 5U and the lower plate 5L of the water jet nozzle 4, but it is depicted in the lower part of FIG. As such, the amount of water flowing out of the water jet nozzle opening end 4a is an extension of the dividing wall 4x. To decrease the flow rate and / or thickness of the water film can become uneven at the width direction of the simulated road surface.). Therefore, in the water jet nozzle of the wet road surface forming device, the flow rate per unit time can be adjusted without changing the flow velocity at the opening end, and the water jet nozzle can be adjusted even if the flow rate is increased. It is desirable that a substantially uniform water film can be more easily formed in the width direction on the simulated road surface without causing the upper and lower plates to bend.

  Thus, one object of the present invention is a wet road surface forming apparatus that forms a water film on a simulated road surface, and the flow rate per unit time can be adjusted without changing the flow velocity at the opening end. In addition, even if the flow rate increases, the water jet nozzle does not cause deflection of the upper and lower plates, and water can be formed more easily so that a substantially uniform water film can be formed in the width direction on the simulated road surface. It is to provide an apparatus with an improved jet nozzle configuration.

According to the present invention, the above-described problem is a table-top wet road surface forming device that forms a water film on a movable pseudo road surface, and includes a flat nozzle upper plate, a nozzle lower plate, and the nozzle upper plate. and the nozzle edge for ejecting substantially nozzle passage which in one direction of the water flow is formed, the water flow onto the simulated road surface at an end in said nozzle flow path in between the nozzle lower plate And a water jet nozzle in which the distance between the nozzle upper plate and the nozzle lower plate is variable, and means for changing the distance between the nozzle upper plate and the nozzle lower plate. The In the above configuration, the bench wet road surface forming device may be provided as part of a bench tire testing device. The movable simulated road surface may be the same as that used in the previous similar device, and is formed on the upper surface of a flat endless belt, the upper surface of a horizontally rotating disk, and the inner surface of a cylinder. It may be a simulated road surface. The distance between the upper and lower nozzle plates may be variable across the plate.

  The wet road surface forming apparatus according to the present invention described above typically has a tire to be inspected placed thereon, as will be described more specifically in the column of the following embodiment (see FIG. 1A). It is an apparatus that attempts to reproduce a wet road surface on a table by forming a water film of an arbitrary thickness on a simulated road surface that is moved in the horizontal direction. During the formation of the water film, water is supplied from a water jet nozzle provided on the upstream side of the moving pseudo road surface for supplying water, and formation of the water film around the tire to be inspected is attempted. It is done. At that time, the jet velocity of water, the amount of water, and the like are adjusted so that the formed water film has a desired thickness, and as described above, the shape of the water jet nozzle and the area of the open end remain unchanged. In this case, when changing the thickness of the water film, the flow velocity is changed to change the flow rate of the water flow, and the adjustment of the flow velocity on the simulated road surface becomes complicated. Therefore, in the present invention, as described above, the water jet nozzle can variably adjust the distance between the nozzle upper plate and the nozzle lower plate which defines the shape of the flow passage in the nozzle and the opening end. As it is configured, furthermore, means are provided for changing the distance between the nozzle upper plate and the nozzle lower plate. According to this configuration, the cross-sectional area of the flow passage in the nozzle and the opening area of the opening end can be changed by changing the distance between the nozzle upper plate and the nozzle lower plate, so that the flow velocity of the water flow is changed. Without it, it is possible to change the flow rate, and it becomes easy to adjust the thickness and / or flow rate of the water film on the simulated road surface.

  More specifically, with respect to the water ejection nozzle of the above apparatus, the flow path in the nozzle and the nozzle opening end are in contact with the nozzle upper plate, the nozzle lower plate, and both edges of the nozzle upper plate and nozzle lower plate, respectively. And a nozzle side plate extending along the direction of water flow. That is, in a water ejection nozzle, a nozzle inner plate, a nozzle lower plate, and a pair of nozzle side plates at both ends thereof form a substantially rectangular parallelepiped nozzle flow path, and an end of the nozzle is substantially rectangular. The open end of is to be formed. In such a configuration, in particular, the nozzle upper plate may be slidable relative to the nozzle side plate in a direction facing the nozzle lower plate. In this case, at least the nozzle upper plate does not abut against the nozzle side plate in a fixed manner and can slide, so that the nozzle upper plate can be held against the nozzle lower plate while maintaining the flat shape without bending. And can be displaced so as to be close to or apart from each other. Then, in order to achieve a desired flow rate and flow velocity, when the distance between the nozzle upper plate and the nozzle lower plate is set to an arbitrary distance, the opening end can always be maintained in a substantially rectangular shape, and is ejected therefrom. In the water flow, it is possible to avoid the occurrence of unevenness (see FIG. 3B) that occurs when the nozzle upper plate and the nozzle lower plate are bent.

  Further, in the above apparatus, the means for changing the distance between the nozzle upper plate and the nozzle lower plate is more specifically the both of the nozzle upper plates along the direction of water flow on the nozzle upper plate. One or more actuators disposed between the edges, each of the one or more actuators abutting a portion of the nozzle upper plate and displacing the distance to the nozzle lower plate at that portion. It may be an actuator. The actuator is moved by, for example, displacing the position of the movable member, one end of which is in contact with any part of the nozzle upper plate, with respect to the nozzle lower plate, as described in the section of the embodiment. In conjunction with this, the nozzle upper plate may be brought close to or separated from the nozzle lower plate. Also, the actuator may preferably be configured to displace the position of the movable member electrically or hydraulically based on any type of control signal, or alternatively the movable member may be manually It may be configured to be displaceable. Further, the number of such actuators may be one or more as described above. When the number of actuators is plural, for example, they may be arranged at substantially equal intervals along the direction perpendicular to the direction of water flow between both edges of the nozzle upper plate. Furthermore, the cross-sectional area of the water jetted from the nozzle in the direction perpendicular to the traveling direction is determined by the shape of the nozzle opening end or the distance between the nozzle upper plate and the nozzle lower plate at the nozzle opening end. Therefore, the mounting position of the actuator in the direction parallel to the direction of the water flow is preferably, but not limited to, near the nozzle opening end. In addition, the shape of the flow path in the nozzle or the distance between the nozzle upper plate and the nozzle lower plate can be more reliably controlled so that the water jetted from the nozzle is in a desired state, for example, a straightening state. Preferably it can be done. To that end, a group of one or more actuators may be provided on the upper plate of the nozzle at a plurality of locations along the extending direction of the flow passage in the nozzle. Thereby, the displacement control by the actuator can be applied over a wide range of the nozzle upper plate, and the control of the distance between the nozzle upper plate and the nozzle lower plate becomes more reliable. One or a plurality of actuators may be provided on the nozzle lower plate.

  In the above-mentioned operation of the device of the present invention, the means for changing the distance between the nozzle upper plate and the nozzle lower plate is based on the requirement of the thickness of the water film formed on the simulated road surface. The distance between the plate and the nozzle lower plate may be controlled. For example, since the required flow rate increases as the required value of the thickness of the water film increases, the distance between the nozzle upper plate and the nozzle lower plate may be controlled correspondingly.

  In the case where the one or more actuators are arranged between both edges of the nozzle upper plate, the force acting on the portion on the nozzle upper plate that contacts each one or more actuators is applied. It is possible to control separately. Therefore, for example, as illustrated in FIG. 3B, when the nozzle upper plate is bent, the deflection is corrected by applying different forces to the individual actuators in order to suppress the bending. It becomes possible to do. Thus, in the arrangement provided with the one or more actuators described above, each of the one or more actuators is such that the nozzle top plate remains substantially flat during the jet of water flow. The position of the corresponding part of the nozzle upper plate may be controlled. Furthermore, in the configuration in which the one or more actuators described above are provided, it is also possible to intentionally cause the deflection of the nozzle upper plate, and the shape of the nozzle opening end is in a certain range. It is also possible to make changes. Therefore, during the jet of water flow, each of the one or more actuators may control the position of the corresponding portion of the nozzle upper plate so that the shape of the nozzle opening end becomes a desired shape. Good. This configuration is advantageous in that the distribution of the flow velocity or flow rate of the water flow in the width direction of the simulated road surface can be adjusted depending on the state of the water film to be formed on the simulated road surface.

  In the device of the present invention, in addition to the above configuration, means for measuring the thickness of the water film by an optical sensor using an optical element (water depth sensor), flow velocity for measuring the flow velocity of water flow Means for adjusting the water flow with reference to the measurement values such as the thickness of the water film, the flow velocity of the water flow, and / or between the nozzle upper plate and the nozzle lower plate at any part of the nozzle upper plate Means for measuring the distance, means for controlling the operation of the actuator as described above provided on the nozzle upper plate, means for measuring and controlling the angle of the water ejection nozzle with respect to the simulated road surface, and the like for controlling the moving speed of the simulated road surface Road surface speed control means or the like may be provided.

  Thus, according to the present invention described above, in the table top wet road surface forming device, the distance between the flat nozzle upper plate and the nozzle lower plate of the water ejection nozzle is made variable so that the water flow direction is increased. Since the cross sectional area of the flow path in the nozzle and the opening area of the nozzle opening end in the perpendicular direction can be changed, the flow rate per unit time can be adjusted without changing the flow rate at the opening end This makes it easy to change the thickness of the water film. Further, by increasing the distance between the nozzle upper plate and the nozzle lower plate when the flow rate is increased, it is possible to suppress an excessive increase in water pressure, and accordingly, the nozzle upper plate and the nozzle lower plate It is also possible to avoid the occurrence of unintended bending in the case. Furthermore, in the case where one or more actuators are disposed between the two edges of the nozzle top plate, the deflection can be corrected, for example, if the water pressure is high, as it is, Even when deflection occurs in the nozzle upper plate, it is possible to maintain a substantially flat shape.

  Other objects and advantages of the present invention will become apparent as the description of the preferred embodiments of the present invention follows.

FIG. 1 (A) is a schematic diagram of a table tire testing apparatus in which a table wet road surface forming apparatus according to the present invention is incorporated, and FIG. 1 (B) executes adjustment of each part of the table wet surface forming apparatus. 3 is a block diagram of the adjustment control device to be 2A and 2B are a schematic perspective view and a cross-sectional view as seen from the side of the water ejection nozzle of the tabletop wet road surface forming apparatus according to the present invention, respectively. FIGS. 2C, 2D, and 2E are end views as viewed from the opening end side of the water jet nozzle. FIGS. 2C and 2D show the case where the position of the nozzle upper plate with respect to the nozzle lower plate is changed while maintaining the flat shape. FIG. 2E shows a state in which the nozzle upper plate is bent and deformed. 3A to 3C are an end view (upper stage) viewed from the opening end side of the water ejection nozzle of the table top wet road surface forming apparatus in the prior art and the distribution of the water film flow ejected from the opening end. It is a top view (lower stage) which shows typically.

1 · · · Upright tire testing device (upright wet road surface forming device)
DESCRIPTION OF SYMBOLS 2 ... Roller 3 ... Belt 3a ... Simulated road surface 4 ... Jet nozzle 4a ... Open end 4b ... Water supply port 4c ... Nozzle side wall 5U ... Nozzle upper plate 5L ... Nozzle lower plate 6 ... Nozzle upper plate displacement actuator 6a ... Movable member

  The invention will now be described in detail by way of several preferred embodiments with reference to the attached drawings. In the drawings, the same reference numerals indicate the same parts.

Overview of Overall Configuration of Tabletop Wet Road Surface Forming Device Referring to FIG. 1 (A), a tabletop wet road surface forming device according to the present invention is realized as part of a tabletop tire testing device 1. In the illustrated example, the table-top tire testing apparatus 1 spans an endless belt 3 having a flat surface (a plane extending in a direction perpendicular to the paper surface) between a pair of rollers 2, and the roller 2 has an arrow a. The belt 3 is rotated in the direction of the arrow b, and the upper surface thereof becomes the movable pseudo road surface 3a. Then, the tire T to be inspected is placed on the pseudo road surface 3a, and the state and characteristics of the tire are inspected. The simulated road surface is not an endless belt type as shown in the figure, but may be another type exemplified in the above-mentioned Patent Document 2. Then, in the above-described tire testing apparatus, a water film is formed on the artificial road surface of the upper surface of the endless belt 3 as a bench wet road surface forming apparatus in order to further test the tire on the road surface wetted with water. A mechanism for water supply to form is provided. In the bench wet road surface forming apparatus of the illustrated example, first, the water jet nozzle 4 is provided on the upstream side in the moving direction of the simulated road surface 3a, the water flow Ws is supplied from the water supply port 4b, and from the open end 4a The water film flow Ws is jetted out, and the jetted water flow Ws forms a water film flow Wm flowing in a direction opposite to the moving direction of the simulated road surface 3a on the simulated road surface 3a, and after passing over the simulated road surface 3a And drops to the water tank on the downstream side of the simulated road surface 3a (Wf) and drained.

  Moreover, since the state and characteristics of the tire also change depending on the thickness of the water film Wm, it is preferable that the thickness D of the water film Wm can be controlled. Therefore, in the above-described apparatus, the optical water depth sensor 7 may be provided, and the thickness D of the water film Wm may be monitored based on the detection value of the sensor 7. The water depth sensor 7 may be, for example, of a type that optically measures water depth. Furthermore, since the thickness D of the water film Wm depends on the flow velocity and the amount of water ejected from the opening end 4a, a velocimeter 8 may be provided to monitor the flow velocity of the water flow Ws from the opening end 4a. . Furthermore, since the state of the water film flow on the simulated road surface is affected by the water jet angle of the water jet nozzle 4 and the height of the open end 4a, any means for adjusting these may be provided.

  The operation of the device described above is controlled by a regulation controller as illustrated in FIG. 1 (B). The adjustment control device may be a computer of a normal type, and includes a CPU and a memory, and the CPU executes various arithmetic processes according to a program stored in the memory. In the operation of the adjustment control apparatus, in short, the measured values of the water depth sensor 7 and the velocimeter 8 are received, and the flow rate of the water flow from the water jet nozzle 4 and the water flow so as to form a desired water film. A control command is transmitted to an actuator that performs adjustment of each part in order to control the flow velocity, the moving speed of the simulated road surface 3a, and the like. Further, in the apparatus of the present invention, as will be described in more detail later, a structure in which the distance between the nozzle upper plate and the nozzle lower plate defining the in-nozzle flow path of the water jet nozzle 4 is variable. Provided. In particular, in the present embodiment, adjustment of the distance between the nozzle upper plate and the nozzle lower plate is performed by changing the relative position of the nozzle upper plate to the nozzle lower plate using a displacement actuator. The Therefore, in order to perform such adjustment, a sensor (nozzle plate distance sensor) that measures a relative distance to the nozzle lower plate at an arbitrary portion along the width direction (direction perpendicular to the water flow direction) of the nozzle upper plate. The measurement value of the nozzle plate distance sensor may be input to the adjustment control device and used for adjusting the distance between the nozzle upper plate and the nozzle lower plate. In that case, while referring to the measurement value of the nozzle plate distance sensor, so that the distance of any part in the width direction between the nozzle upper plate and the nozzle lower plate becomes a target value determined by any method, The displacement actuator will be driven.

  In addition, regarding the adjustment or control of each part of the above-mentioned platform wet road surface forming device, the measurement of the thickness of the water film formed on the pseudo road surface, the control of the nozzle angle, the correction of the deflection of the nozzle plate, etc. The configuration described in Japanese Patent Application No. 2014-016705 by the applicant may be used.

As described in the "Summary of the Invention" section of the configuration of the water jet nozzle, the tip portion of the water jet nozzle 4 is directed to the width direction of the simulated road surface in order to jet the water flow like a film on the simulated road surface. It has a flat flow path extending substantially in parallel, and the opening end 4a is formed into a wide, substantially rectangular shape extending in parallel with the width direction of the simulated road surface. In that case, when the shape of the open end 4a is invariable as shown in FIG. 3A, it is necessary to change the flow rate when changing the flow rate to change the thickness of the water film. Flow rates may also vary, and adjustments may be complicated to achieve the desired water film conditions. In addition, when the water pressure becomes excessively high with respect to the rigidity of the nozzle upper plate 5U and the nozzle lower plate 5L which define the in-nozzle flow path and the opening end 4a, as illustrated in FIG. 3B, the nozzle upper plate The 5U and the nozzle lower plate 5L are bent, which may cause unevenness in the distribution of the flow rate or the flow velocity in the width direction in the jetted water flow.

  Therefore, in the present invention, in order to eliminate the above-described problems at the tip of the water jet nozzle 4, the nozzle upper plate 5U and the nozzle lower plate 5L that define the nozzle inner flow path 4r and the opening end 4a are provided. The configuration of the water jet nozzle 4 is improved so that the distance between the two can be varied over the entire area of the plates.

  Referring to FIG. 2, in the water jet nozzle 4 of the table top wet road surface forming apparatus of the present invention, as in the case of the conventional water jet nozzle, the flat plate-like shapes arranged in parallel with each other are separated. The nozzle upper plate 5U and the nozzle lower plate 5L, and the nozzle side wall 4c that comes into contact with both edges of the nozzle upper plate 5U and the nozzle lower plate 5L define a flat nozzle inner flow path 4r and an opening end 4a. The water flow Ws is supplied from the water supply port 4b at the left end in FIG. 2B to the water supply chamber defined by the lid part 4d, the nozzle lower plate 5L, and the nozzle side wall 4c, and further to the right. It flows, and it will be ejected by the opening end 4a of the right end of the flow path 4r in a nozzle. In such a configuration, the nozzle lower plate 5L is fixedly connected to the nozzle side wall 4c (may be formed integrally), while the nozzle upper plate 5U has both edges at the nozzle side wall 4c. Against which they are slidably contactable (the abutment surfaces may be sealed so that water does not leak).

  In the configuration of the water jet nozzle described above, in order to variably adjust the position of the nozzle upper plate 5U with respect to the nozzle lower plate 5L, an arbitrary portion between both edges of the nozzle upper plate 5U is provided on the nozzle upper plate 5U. The displacement actuator 6 is attached to the part. For example, as shown in FIGS. 2 (C) to 2 (E), a plurality of displacement actuators 6 are disposed at substantially equal intervals between both edges of the nozzle upper plate 5U, and the plurality of displacement actuators 6 are arranged. As illustrated in FIGS. 2A and 2B, the set of 6 is arranged along the length direction of the nozzle (direction parallel to the direction of water flow) at an arbitrary interval. Each displacement actuator 6 has a movable member 6a displaceable with respect to the base 6b fixed to the nozzle side wall 4c, and the lower end of the movable member 6a is fixed to the corresponding portion on the nozzle upper plate 5U. In addition, the displacement of the movable member 6a with respect to the base 6b may be achieved by driving the movable member 6a in an arbitrary manner such as an electric type or a hydraulic type. In that case, the drive control of the movable member 6a may be executed based on the control signal from the adjustment control device as mentioned above. Also, the nozzle plate distance sensor may be achieved by a sensor that detects the position of the movable member 6a relative to the base 6b.

  Thus, according to the configuration in which the above-mentioned displacement actuator 6 is fixed to several parts of the nozzle upper plate 5U, the movable member 6a of the displacement actuator 6 is shown in the figure as an arrow relative to the base 6b. The nozzle upper plate 5U is displaced in association with the vertical displacement, and the distance between the nozzle upper plate 5U and the nozzle lower plate 5L is changed, whereby the opening of the opening end 4a from which the water flow is ejected is changed. The area (the cross-sectional area of the water flow) can be changed. Therefore, the distance between the nozzle upper plate 5U and the nozzle lower plate 5L by driving the movable member 6a of the displacement actuator 6 based on the amount of water to be supplied according to the thickness of the water film formed on the simulated road surface. Can be controlled. In this regard, in the example shown in this regard, the displacement actuator 6 is disposed between both edges of the nozzle top plate 5U, and the displacement actuators 6 independently apply a pressing force to the contact portion of the nozzle top plate 5U. It is possible. Therefore, for example, due to the high water pressure in the nozzle flow path 4r and / or the open end 4a, the nozzle upper plate 5U has been bent as shown in FIG. 3B. Even in this case, by increasing the pressing force at the portion where the deflection becomes large, it is possible to suppress the deflection and maintain the flat plate shape of the nozzle upper plate 5U. Further, when it is desired to change the flow rate distribution of the water film flow ejected from the opening end 4a according to the distribution state of the thickness of the water film ejected from the opening end 4a, as illustrated in FIG. The displacement amount of the movable member 6a of the displacement actuator 6 may be individually controlled so that the nozzle upper plate 5U is intentionally bent. (In the example of FIG. 2 (E), the amount of water near both ends on the simulated road surface is adjusted to be larger than the center region by bending the center portion of the nozzle upper plate 5U downward as compared to both ends. Will be.)

  The number of displacement actuators 6 may be one or more in the width direction of the nozzle upper plate 5U. When the number of arrangement is one, for example, it may be arranged approximately at the center in the width direction of the nozzle upper plate 5U. In the case where the number of arrangement is plural, they may be arranged at substantially equal intervals between both edges of the nozzle upper plate 5U. The number of displacement actuators 6 arranged in the longitudinal direction of the nozzle upper plate 5U may be arbitrary, for example, in consideration of the size of the nozzle upper plate 5U. Furthermore, although not shown, it should be understood that the same displacement actuator 6 may be provided in the nozzle lower plate 5L, and such a case also belongs to the scope of the present invention.

  Regarding the control of the distance between the nozzle upper plate and the nozzle lower plate, the distance between the nozzle upper plate and the nozzle lower plate that realizes the required value of the water film thickness and the flow velocity (the water film thickness and the nozzle upper The relationship between the distance between the plate and the nozzle lower plate and the flow rate) is determined experimentally in advance, and using their values, the adjustment of the distance between the nozzle upper plate and the nozzle lower plate and the flow rate May be done. In that case, as already mentioned, since the cross-sectional area of the nozzle flow path and the area of the open end can be changed according to the amount of water to be ejected, the flow rate can be adjusted without changing the flow velocity or water pressure. Even if it increases, by increasing the distance between the nozzle upper plate and the nozzle lower plate, it is possible to avoid an increase in water pressure, and hence it is possible to avoid the occurrence of bending. In addition, even if the water pressure is relatively high compared to the rigidity of the nozzle upper plate and deflection may occur in the nozzle upper plate, the pressing force of each of the displacement actuators 6 disposed on the nozzle upper plate can be appropriately determined. By adjusting independently, the flat plate shape of the nozzle upper plate can be maintained.

  Although the above description is made in connection with the embodiments of the present invention, many modifications and variations are easily possible for those skilled in the art, and the present invention is limited to the embodiments exemplified above. It should be apparent that the invention is not limited and may be applied to various devices without departing from the inventive concept.

Claims (5)

A bench top wet road surface forming apparatus for forming a water film on a movable pseudo road surface, comprising:
A plate-like nozzle upper plate, a nozzle lower plate, a nozzle flow path in which a substantially one-way water flow is formed between the nozzle upper plate and the nozzle lower plate, and an end of the nozzle flow path A nozzle opening end for jetting the water flow on the simulated road surface, and a water jet nozzle in which a distance between the nozzle upper plate and the nozzle lower plate is variable,
Means for changing the distance between the nozzle upper plate and the nozzle lower plate,
The means for changing the distance between the nozzle upper plate and the nozzle lower plate is one or a plurality of actuators provided at a plurality of locations along the extending direction of the flow path in the nozzle. Includes one or a plurality of actuators for displacing the distance between the nozzle upper plate and the nozzle lower plate, and based on the required value of the thickness of the water film formed on the simulated road surface, An apparatus for controlling the distance between the nozzle upper plate and the nozzle lower plate so that the distance between the nozzle upper plate and the nozzle lower plate increases as the required value of the film thickness increases.   The apparatus according to claim 1, wherein the flow path in the nozzle and the nozzle opening end are in contact with both edges of the nozzle upper plate, the nozzle lower plate, and the nozzle upper plate and the nozzle lower plate, respectively. An apparatus defined by a nozzle side plate extending along a direction of water flow, wherein the nozzle upper plate is slidable relative to the nozzle side plate in a direction opposite to the nozzle lower plate. The apparatus according to claim 1 or 2, wherein the one or more actuators of the means for changing the distance between the nozzle upper plate and the nozzle lower plate are in the direction of the water flow on the nozzle upper plate. The nozzle upper plate is disposed between both edges of the nozzle upper plate, and each of the one or more actuators abuts on a portion of the nozzle upper plate and displaces the distance to the nozzle lower plate at the portion. A device that is an actuator.   4. The apparatus of claim 3, wherein each of the one or more actuators corresponds to a corresponding portion of the nozzle top plate such that the nozzle top plate remains substantially flat during the water flow ejection. A device that controls the position of the machine.   4. The apparatus according to claim 3, wherein each of the plurality of actuators positions a corresponding portion of the nozzle upper plate so that a shape of the nozzle opening end becomes a desired shape during the ejection of the water flow. The device to control.

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