JP2006153708A - Testing instrument for vehicle travel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a testing instrument for vehicle travel capable of reproducing the desired road face conditions, by forming a prescribed thickness of water film or the like, on a flat level to carry out travel test. <P>SOLUTION: A tank 10 stores a large volume of water, and a driving roller 12 and a driven roller 14 laid over with an endless belt 20 are installed to raise up water by the belt in the periphery of the driven roller 14, when the endless belt 20 is rotated. A water guide means 22 is further provided to guide the raised-up water onto the upper side belt of the endless belt 20, and a water film setting roller 24, comprising a pair of rollers made to face the upper-side belt sandwiched therebetween, is further provided in the tank 10 to make the water guided by the water guide means 22 pass between the paired rollers and spray the water onto the upper-side belt. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a vehicle running test apparatus that mounts and rotates wheels of a vehicle such as an automobile on a belt and reproduces the running state of the vehicle to perform a running test of the vehicle. The present invention relates to a vehicle running test apparatus that can reproduce the road surface condition on a belt.

  For example, in order to carry out vehicle running tests under various environmental conditions, such as when the road surface is wet by rainwater and a water film is formed, or when snow or mud is accumulated on the road surface, There are times when it is made to run on the test course. As the vehicle running test under these various environmental conditions, for example, there is a test for checking and evaluating the state of adhesion of water, ice, snow and mud to a running vehicle. Based on the test data obtained from the actual driving test (for example, test data for checking and evaluating the adhesion of water, ice, snow and mud to a running vehicle) It is carried out.

  However, the actual driving test of the vehicle on the test course has the following problems. First, when performing a running test of a vehicle under various environmental conditions, it is necessary to wait until a desired environmental condition is reached, and there is a problem that a long test time is required. In addition, the state of water film, snow, mud, etc. on the road surface changes from moment to moment while the actual running test is repeated, so that the vehicle's running state under the desired environmental conditions can be reproduced. There is a problem that it is difficult to collect a large number of test data relating to the running state of the vehicle under the desired environmental conditions.

  Furthermore, since the road surface shape in the test course is not constant, it is necessary to analyze which road surface in the test course the vehicle has traveled in order to analyze the test data. Is required. Further, since it is extremely difficult to grasp all the road surface shapes in the test course, there is a problem that the reproducibility for reproducing the traveling state of the vehicle under a certain road surface condition is poor.

  Therefore, instead of running tests on the test course, a vehicle running test device that reproduces the running condition of the vehicle indoors and performs a running test of the vehicle can be used to control environmental conditions such as temperature, humidity, and wind intensity. In such a wind tunnel, by reproducing the traveling state of the vehicle, the reproducibility of the traveling condition is improved, and a large number of traveling test data under the same traveling condition can be collected efficiently. As a vehicle running test apparatus that reproduces the running state of such a vehicle, for example, there is an apparatus described in Patent Document 1 below.

  The apparatus described in Patent Document 1 is to place a wheel on an endless flat belt and rotate it to simulate the running state of the vehicle, place the wheel on the flat belt, And the contact state of the road surface can be reproduced correctly.

  Conventionally, in a running test performed in a wind tunnel using a vehicle running test apparatus as described in Patent Document 1, environmental conditions such as temperature, humidity, and wind intensity can be controlled, but a water film is formed. It was not possible to reproduce the road surface conditions under various environmental conditions, such as snow covered or snow or mud. Therefore, it is desired that road conditions under various environmental conditions can be reproduced in a running test using a vehicle running test apparatus. This is because if the vehicle running test apparatus can reproduce the road surface conditions under various environmental conditions, the running test under various environmental conditions can be performed indoors (in the wind tunnel) regardless of the actual weather. Here, for example, as a technique for making a flat belt on a wet state in order to test a running state on a wet road surface, there is one disclosed in Patent Document 2 below.

  In Patent Document 2, a plurality of watering nozzles are provided at regular intervals in the width direction of an endless belt (flat belt), and water is ejected from the watering nozzles onto the endless belt to test the running state on a wet road surface. A tire testing apparatus that enables this is disclosed.

JP-A-6-249753 JP 2002-39919 A

  For example, a water film having a predetermined thickness is formed on the road surface during actual rainy weather. Therefore, in order to perform a running test by reproducing the running state of the vehicle in rainy weather with a vehicle running test apparatus using a flat belt as in Patent Document 1, a predetermined thickness is applied on the flat belt of the apparatus during the running test. A water film must be formed. However, even if water is jetted onto the flat belt using a plurality of watering nozzles as in Patent Document 2, a water film having a predetermined thickness cannot be formed on the flat belt, and the road surface condition during rainy weather It cannot be reproduced.

  Thus, since the road surface condition during rainy weather cannot be reproduced in the vehicle running test apparatus, the running test during rainy weather cannot be performed indoors (in the wind tunnel) regardless of the actual weather. Therefore, in order to collect the running test data in rainy weather, the running test on the test course is inevitably performed at the end. In addition, as for the road surface conditions under various other environmental conditions, a driving test on a test course is similarly required.

  SUMMARY OF THE INVENTION An object of the present invention is a vehicle running test apparatus for carrying out a running test of a vehicle by reproducing the running state of the vehicle by placing and rotating a vehicle wheel on a belt, and reproducing a desired road surface condition on the belt. An object of the present invention is to provide a vehicle running test apparatus that can perform the above.

  A vehicle running test apparatus according to the present invention is a vehicle running test apparatus for performing a running test of a vehicle by placing and rotating a vehicle wheel on an endless belt stretched between a driving roller and a driven roller, The tank where the drive roller and the driven roller over which the endless belt is stretched and the water that has been wound up are placed on the upper belt of the endless belt so that the water is wound up by the belt around the driven roller when the endless belt rotates. A water film setting means that comprises a water guiding means for guiding the water and a pair of rollers facing each other across the upper belt, and the water guided by the water guiding means is passed between the pair of rollers and sprinkled on the upper belt. And a roller for use.

  Further, in the vehicle running test apparatus configured as described above, the water guiding means includes a flat plate eaves portion disposed substantially parallel to the upper belt of the endless belt, and an arc shape disposed along the belt around the driven roller. And a guide portion of the plate. Furthermore, this guide part is connected to this eaves part so that sliding is possible along the eaves part.

  Further, in the vehicle running test apparatus having the above-described configuration, the tank has a bypass flow path for returning excessive water that cannot be guided by the water guiding means into the tank again. The tank further includes a water temperature adjusting device that adjusts the water temperature of the water in the tank.

  In the vehicle running test apparatus having the above configuration, the endless belt is made of polytetrafluoroethylene, and the surface of the belt has minute scratches formed over the entire surface.

  According to the present invention, since a water film having a predetermined thickness can be formed on a flat belt on which the wheels of a vehicle are placed, it is possible to reproduce the road surface condition during rainy weather. Further, by mixing mud and snow into the water in the tank, it becomes possible to reproduce the road surface conditions of the mud and snow roads. Therefore, for example, tests that have been performed by actual running on a test course, such as tests that confirm and evaluate the adhesion of water, ice, snow, and mud to a running vehicle, and brake evaluation tests. However, it can be carried out indoors (in the wind tunnel) without being affected by actual environmental (weather) conditions. In addition, since the reproducibility of traveling under the same traveling condition is improved, it is possible to efficiently collect traveling test data on a desired road surface condition.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a schematic configuration of a vehicle travel test apparatus according to an embodiment of the present invention. This vehicle running test apparatus includes a tank 10, a driving roller 12, a driven roller 14, a support roller 16, idler rollers 18 a to 18 d, an endless belt (hereinafter also simply referred to as a belt) 20, and water guiding means 22. And a water film setting roller 24, a water recovery means 26, and a wave preventing plate 28.

  The tank 10 contains a large amount of water used for forming a water film on the belt 20. As shown in FIG. 1, the tank 10 includes a driving roller 12, a driven roller 14, a support roller 16, idler rollers 18 a to 18 d, and water film setting rollers 24. It is mounted for rotation. Further, the water guiding means 22 is provided on the side wall of the tank 10 on the driven roller 14 side, and the water recovery means 26 is provided on the side wall of the tank 10 on the driving roller 12 side.

  The endless belt 20 is stretched around the driving roller 12, the driven roller 14, and a plurality of support rollers 16 (support roller group). The support roller 16 is for supporting a vehicle placed on the belt 20, and a plurality of support rollers 16 are arranged in a row inside the upper belt. Here, in the present embodiment, the endless belt 20 is made of, for example, polytetrafluoroethylene (PTFE). According to this, for example, it is possible to prevent the generation of a large noise that occurs when the running state of the vehicle is reproduced using a steel belt. In addition, fine groove-like fine scratches are randomly formed on the entire surface of the belt 20 made of PTFE, and water is uniformly held on the belt 20 due to the influence of capillary action generated inside the scratches. ing. Thereby, a water film having a predetermined thickness is more uniformly formed over the entire surface of the belt 20.

  The driving roller 12 is rotated by a driving device (not shown) such as a motor, and the endless belt 20 is rotated by this rotation, so that the traveling state of the vehicle can be reproduced. One idler roller 18a, 18b for lifting the lower belt is provided in the vicinity of the drive roller 12 and the driven roller 14. This is to prevent the lower belt from being immersed in the water in the tank 10. The idler rollers 18 a and 18 b prevent the belt 20 from coming into contact with the water in the tank 10, so that water enters between the belt 20 and the driven roller 14 during the high-speed rotation of the belt 20, and between the belt 20 and the driven roller 14. It is possible to prevent the side slip of the belt 20 due to the decrease in friction.

  In this embodiment, idler rollers 18c and 18d for removing water adhering to the inside of the belt 20 are in the vicinity of the driving roller 12 and the driven roller 14 as shown in FIG. , 14 is provided at a position before the belt 20 is wound around. Thereby, the occurrence of skidding of the belt 20 due to water entering between the belt 20 and the driven roller 14 can be further prevented.

  As shown in FIG. 2, the water guiding means 22 is configured to include an eaves portion 22a and a guide portion 22b. The eaves portion 22a is a flat plate, and the guide portion 22b is an arc-shaped plate. The water guiding means 22 is attached to the tank 10 so that the lower surface of the eaves portion 22 a is substantially parallel to the upper surface of the belt 20 and the guide portion 22 b is along the belt 20 around the driven roller 14. Moreover, this guide part 22b becomes a structure which can be slid with respect to the eaves part 22a. Then, by sliding the guide portion 22b to adjust the distance between the guide portion 22b and the driven roller 14, the amount of water that is wound up by the rotation of the driven roller 14 and guided onto the belt 20 as will be described later. Can be adjusted.

  The water film setting roller 24 includes a pair of rollers facing each other with the upper belt interposed therebetween, and is disposed between the support roller group and the driven roller 14. Then, the water guided on the belt 20 by the water guiding means 22 as described later passes between the pair of rollers, so that the water is uniformly sprinkled on the belt 20 and a water film having a predetermined thickness is rotating. 20 is formed. The interval between the pair of rollers in the water film setting roller 24 may be configured to be changeable according to the target thickness of the water film formed on the belt 20.

  The water recovery means 26 is for recovering the water forming the water film on the belt 20 into the tank 10. For example, as shown in FIG. 3, the water recovery means 26 has a configuration in which a guide plate is provided in a substantially eight-character shape on a flat plate so that water recovered from the belt 20 is dispersed and recovered in the tank 10. ing. This is because if the water in the tank 10 undulates and wave water enters between the belt 20 and the drive roller 12, the belt 20 may slip sideways. This is because it is necessary to disperse and collect the water on the belt 20 so as to prevent ripples.

  Further, in the present embodiment, a wave preventing plate 28 is provided to prevent water waves in the tank 10 generated by the rotation of the belt 20 from entering between the belt 20 and the driven roller 14. Thereby, it is possible to prevent the occurrence of skidding of the belt 20 due to the wave water entering between the belt 20 and the driven roller 14.

  Next, the operation | movement which reproduces | regenerates the driving | running | working state on the road surface at the time of rain as an example using the vehicle running test apparatus of the above structures is demonstrated.

  First, the vehicle wheel is placed on the belt 20. At this time, either the left or right front / rear wheel of the vehicle may be placed and the other front / rear wheels may be constrained by equipment or the like. When the driving roller 12 is rotated with the wheels placed on the belt 20, the belt 20 stretched over the driving roller 12 and the driven roller 14 rotates to reproduce the traveling state of the vehicle. In the present embodiment, the drive roller 12 rotates clockwise and the belt 20 rotates clockwise as well, so that the vehicle is traveling in the left direction on the page.

  At this time, on the driven roller 14 side, the water in the tank 10 is wound up by the belt 20 wound around the driven roller 14 by rotation. Then, the rolled up water is guided toward the water film setting roller 24 on the belt 20 by the guide portion 22 b and the eaves portion 22 a of the water guiding means 22.

  The water thus guided passes between the pair of rollers of the water film setting roller 24 and is sprinkled on the belt 20. By passing between the pair of rollers, the water is uniformly sprinkled on the belt 20. Therefore, a water film having a predetermined thickness can be formed on the belt 20 during the rotating operation.

  The water (water film) on the belt 20 moves together with the belt 20 and is collected in the tank 10 through the water collecting means 26. Thus, the water in the tank 10 is circulated and used to form a water film on the belt 20.

  As described above, according to the vehicle running test apparatus according to the present embodiment, a water film having a predetermined thickness can be formed on the belt 20, and the road surface condition during rainy weather can be reproduced. Therefore, by using the vehicle running test apparatus having the above-described configuration, it is possible to perform a running test during rainy weather indoors regardless of the actual weather.

  Here, in the vehicle travel test apparatus according to the present embodiment, for example, a tank 10a configured as shown in FIG. 4 may be used. In the vehicle running test apparatus, the water in the tank 10 a is wound up by the belt 20 wound up on the driven roller 14, and the water is used for forming a water film on the belt 20. However, when the rate of increase in the amount of water wound up by the driven roller 14 is greater than the rate of drainage of the amount of water from the water guiding means 22, the flow of water guided from the water guiding means 22 toward the water film setting roller 24. Since the water does not advance smoothly, water accumulates below the water guiding means 22 and a water film having a predetermined thickness may not be continuously formed. Therefore, in order to prevent such a situation from occurring, the excess water that has not been smoothly guided and drained by the water guiding means 22 (stored below the water guiding means 22) is returned to the tank 10 again. The bypass passage 30 is provided in the tank 10.

  According to this, since the flow of water during the running test proceeds smoothly, the predetermined thickness of the water film formed on the belt 20 can be continuously maintained. Further, since the excess water returns to the tank 10 through the bypass channel, the excess water can naturally be circulated and used.

  Even in the vehicle running test apparatus using the tank 10a having such a configuration, when it is desired to increase the amount of water to be guided, the guide portion 22b of the water guiding means 22 is slid with respect to the eaves portion 22a to guide the vehicle. By increasing the interval between the portion 22b and the driven roller 14, the amount of water can be increased. On the other hand, when it is desired to reduce the amount of water to be guided, the guide portion 22b of the water guiding means 22 is slid with respect to the eaves portion 22a, and the interval between the guide portion 22b and the driven roller 14 is narrowed. Just do it.

  In addition, a water temperature adjusting device that enables water temperature adjustment by a heater (not shown) or the like is provided in the tanks 10 and 10a, and the water temperature adjusting device is controlled by a control device (not shown), so that water in the tank 10 can be controlled. You may make it the structure which can adjust water temperature. In such a configuration, for example, in a wind tunnel that can control environmental conditions such as temperature, humidity, and wind intensity, the vehicle running test apparatus is used to reproduce the running state of the vehicle in a low temperature environment. This is effective when running tests under the above conditions. Specifically, by adjusting the water temperature of the water in the tanks 10 and 10a, it is possible to prevent the water from freezing on the belt 20 even if the inside of the wind tunnel is in a low temperature environment. As a result, it is possible to reproduce the actual running state during rainy weather in a low temperature environment.

  Further, when the tanks 10 and 10a having the water temperature adjustable are provided, a part of the lower side of the driving roller 12 is put in the water in the tanks 10 and 10a, so that the rotation of the driving roller 12 causes the inside of the tanks 10 and 10a. Since the water is stirred, the water temperature in the tank can be easily controlled.

  In this embodiment, the case of reproducing the running state of the vehicle in rainy weather has been described as an example. However, other road surface conditions can be reproduced on the belt 20 by the vehicle running test apparatus according to this embodiment. It is. For example, mud and snow are mixed into the water in the tank 10 and the same operation as described above is performed, whereby the road surface condition of the mud and snow roads can be reproduced. In addition, by setting the inside of the wind tunnel to a condition under a low temperature environment, it is possible to reproduce a state where ice is formed on the road surface.

1 is a diagram illustrating a schematic configuration of a vehicle travel test apparatus according to an embodiment of the present invention. It is a perspective view which shows the structure of the water guidance means in the vehicle travel test apparatus of FIG. It is a figure which shows the back surface of the water collection | recovery means in the vehicle running test apparatus of FIG. It is a figure which shows schematic structure of the vehicle travel test apparatus which concerns on other embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Tank, 12 Drive roller, 14 Driven roller, 16 Support roller, 18a-18d idler roller, 20 Endless belt (belt), 22 Water guidance means, 24 Water film setting roller, 26 Water recovery means, 28 Wave protection plate

Claims (6)

A vehicle running test apparatus for carrying out a running test of a vehicle by placing and rotating a vehicle wheel on an endless belt stretched between a driving roller and a driven roller,
A tank in which a drive roller and a driven roller are installed, in which the endless belt is wound, so that water is wound up by the belt around the driven roller when the endless belt rotates.
Water guiding means for guiding the rolled up water onto the upper belt of the endless belt;
A water film setting roller that is composed of a pair of rollers facing each other with the upper belt interposed therebetween, and water guided by the water guiding means passes between the pair of rollers to spray water on the upper belt;
A vehicle running test apparatus comprising: The vehicle running test apparatus according to claim 1,
The water guiding means is
A flat plate eaves disposed substantially parallel to the upper belt of the endless belt;
A guide portion of an arcuate plate disposed along the belt around the driven roller;
A vehicle running test apparatus comprising: The vehicle running test apparatus according to claim 2,
The vehicle running test apparatus, wherein the guide portion of the water guiding means is slidably connected to the eaves portion along the eaves portion. In the vehicle travel test apparatus according to any one of claims 1 to 3,
The vehicle running test apparatus according to claim 1, wherein the tank has a bypass flow path for returning excessive water that cannot be guided by the water guiding means back into the tank. In the vehicle running test device according to any one of claims 1 to 4,
The said tank is provided with the water temperature adjustment apparatus which adjusts the water temperature of the water in a tank, The vehicle travel test apparatus characterized by the above-mentioned. In the vehicle travel test apparatus according to any one of claims 1 to 5,
A material for the endless belt is polytetrafluoroethylene, and a minute scratch is formed on the entire surface of the belt.

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