JPH09145551A - Chassis dynamometer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a rough road inexpensively in a short time while increasing the rotational speed by coating the roller surface irregularly with resin thereby simulating a pavement. SOLUTION: While turning a roller 3 at a low speed of about 0.8km/h and moving a nozzle 19 in the breadthwise direction of roller 3, hot melt polyamide is sprayed through the nozzle 19 by pneumatic pressure being fed from a pneumatic valve 21 thus coating the surface of roller 3 irregularly with polyamide. Moving speed and stopping time of nozzle 19 are controlled by means of a controller 24 according to a program in a programmer 26 thus determining the height and pitch of irregularities. Subsequently, the air is blown from a dryer 27 to the surface of roller in order to cure the polyamide.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chassis dynamometer for carrying out a running performance test of a vehicle, and more particularly to a rough road (a rough road surface) for carrying out tests such as vibration and noise during running on a rough road surface.

[0002]

2. Description of the Related Art In a chassis dynamometer, a tire of a vehicle is placed on a roller connected to a dynamometer and the like, and the vehicle is run to perform a running performance test and a test for vibration and noise. At that time, a rough road or a flat road surface is formed on the surface of the roller so that the vehicle travels in a state similar to that of traveling on an actual road surface.

In a conventional chassis dynamometer, a rough road segment of aluminum casting is formed on the basis of a model of an actual road surface, and the rough road segment is fixed to the surface of a roller with a bolt to form a rough road. . 5 (a) and 5 (b) show a rough road segment 1 having a roughened surface and a rough road segment 2 having a cobblestone surface. For example, as shown in FIG.
It was fixed by and the rough road was formed. in this case,
The rough road segments 1 and 2 have a size obtained by dividing the surface of the roller 3 into eight, and eight rough road segments 1 and 2 are provided.
Covered the entire circumference of roller 3. The weight of one rough road segment 1 and 2 was about 14.5 kg.

Further, in the conventional chassis dynamometer, a long hard urethane rough road segment is prepared based on a model of an actual road surface, and the rough road segment is attached to the surface of the roller 3 with an adhesive. It was forming a rough road. In this case, since the belt-shaped rough road segment divided into two parts is wound around the surface of the roller 3 and attached by an adhesive, it is difficult to remove the rough road segment, and it is used as the roller 3 dedicated to the rough road surface.

[0005]

As described above, conventionally, the rough road segment made of aluminum casting or hard urethane is attached around the roller 3 to form the rough road. However, when the rough road segments 1 and 2 are made of aluminum casting, it is necessary to mold the actual road surface, make a mold, perform a casting operation, and perform an X-ray inspection. did. Further, since the rough road segments 1 and 2 which are heavy in weight are attached by the bolts 4, the attachment strength at the time of rotation is weak, and the rotation speed can only be about 80 km / h. Further, since the rough road segments 1 and 2 are divided into eight, there are many seams, and this seam generates noise when the roller rotates, and there is a problem that an accurate test cannot be performed especially in a noise test. Further, it is necessary to remove the rough road segments 1 and 2 at the time of the test on the flat road surface.

Further, when the rough road segment is made of hard urethane, it is necessary to mold the actual road surface, make a mold, pour the hard urethane, and attach it to the roller 3, so that the manufacturing cost is high. It took a long time to produce. Also, since it is lighter than aluminum casting, the rotation speed can be increased to some extent, but it is still 100 km.
It was about / h. Also, since it is divided into two, there are few seams,
After all, noise was generated by the seams. Further, since the rough road segment is attached to the roller 3 with an adhesive, it is difficult to remove the rough road segment, and the flat road surface test cannot be performed.

The present invention has been made to solve the above problems, and a rough road can be manufactured in a short time and at low cost, and since it is lightweight, it can be rotated at a high speed. No noise from seams,
The purpose of the present invention is to obtain a chassis dynamometer that can easily change between rough road tests and flat road tests.

[0008]

A chassis dynamometer according to claim 1 of the present invention forms a rough road by forming unevenness by imitating the roller surface by applying resin with unevenness on the roller surface to form a rough road. Is lightweight, has high mounting strength, and is easy to manufacture.

In the chassis dynamometer according to the second aspect, the resin applied to the roller surface is polyamide in a hot melt state.

A chassis dynamometer according to a third aspect of the present invention is a chassis dynamometer in which a resin is applied to a non-slip tape attached to a roller surface to enhance adhesive strength.

In the chassis dynamometer according to a fourth aspect of the present invention, the resin applied to the surface of the roller is coated with an epoxy coating for increasing the surface strength.

In the chassis dynamometer according to a fifth aspect of the present invention, resin is applied to the roller surface via a primer for increasing the adhesive strength.

In the chassis dynamometer according to a sixth aspect of the present invention, a rough road is formed in about half of the roller width on the roller surface and a flat road surface is formed in the remaining portion, and the test on the rough road and the test on the flat road surface are switched. To facilitate.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. 1A and 1B are a perspective view and a partial front view of a resin coating device according to this embodiment,
A roller 3 is rotatably supported, and hot-melt polyamide is applied to the surface of the roller 3 with unevenness simulating an actual road surface. Reference numeral 17 denotes a uniaxial robot fixed on an arbitrary fixed portion 18 such as a pit cover of a chassis dynamometer, and supports a nozzle 19 movably in the width direction of the roller 3 near the outer circumference of the roller 3.

Polyamide in a hot melt state is supplied to the nozzle 19 via a supply pipe 20 from an applicator (not shown). Reference numeral 21 is a pneumatic valve for supplying air pressure to the nozzle 19, and a switch box 22 via a connecting wire 23.
Is connected to Reference numeral 24 is a controller that controls the operation of the nozzle 19. The controller 24 is connected to the switch box 22 via a connection line 25, and is also connected to the programmer 26. 27 is a dryer, L
Is the width of the roller 3.

Next, the operation of the resin coating device having the above structure will be described. When applying the resin, the roller 3 is set to 0.
Slowly rotate at a speed of about 8 km / h to make the nozzle 1
While moving 9 in the width direction of the roller 3, the pneumatic valve 21
The polyamide in a hot melt state is blown out from the nozzle 19 by the air pressure from, and the surface of the roller 3 is coated with unevenness. The moving speed and stopping time of the nozzle 19 are controlled by the controller 24 according to a program from the programmer 26, and the height and pitch of the unevenness are determined by this.

A program for obtaining a rough road similar to an actual road surface is to manufacture various kinds of rough roads having arbitrary irregularities and actually perform various tests using a vehicle to measure the measured data and the measured data on the actual road surface. Determined by repeating the experiment comparing with the appropriate data from. The applied polyamide is cured by blowing air from the dryer 27.

Since the rough road thus formed has no seam, no noise is generated by the seam.
It was also confirmed that the peeling due to centrifugal force or the like did not occur at a certain rotation speed.

However, in order to cope with a higher rotation speed, it is necessary to further increase the adhesive force of the polyamide to the roller 3. In such a case, as shown in FIG. 2, non-slip tape 13, primer 14, epoxy coating 16 and the like are used. First, a non-slip tape 13 is attached to the surface of the roller 3 in order to improve the adhesion of the polyamide 15 to the roller 3. The non-slip tape 13 is generally used as a non-slip material, and has mineral particles used as a non-slip material as surface abrasive grains on the surface of an aluminum base tape having a back surface having adhesiveness. The reason why the non-slip tape 13 is made of aluminum is because heat resistance is taken into consideration because the polyamide 15 in a hot melt state has a high temperature exceeding 200 ° C.

The primer (base treatment agent) 14 is applied on the non-slip tape 13 as needed, and is for further improving the adhesiveness of the polyamide 15. On the primer 14, a hot melt polyamide 15 is applied with unevenness simulating an actual road surface. By coating the surface of the polyamide 15 with which the tire of the vehicle directly contacts with an epoxy coating 16 by any means, for example, a roller for painting, in order to secure hardness, prevent damage and abrasion, and increase durability. It has been subjected.

FIG. 3 is a front view of the chassis dynamometer according to this embodiment, wherein 5 is a bearing stand and 6 is a bearing stand 5.
The bearings are provided above, and the pair of bearings 6 rotatably supports a pair of rollers 3 via a roller shaft 7. The roller shaft 7 is connected to a rotary shaft 9 of a dynamometer 8. The rough road 10 is formed on approximately half of the roller width of the surface of the roller 3 as described above, and the flat road surface 11 is formed on the other approximately half thereof. For example, the roller width is 700m
If m, 350 mm is the rough road 10 and the remaining 350 mm is the flat road surface 11. However, one of the widths may be increased by 5 to 10 mm. Reference numeral 12 is a tire of a vehicle placed on the rough road 10 or the flat road surface 11. The flat road surface 11 is knurled.

FIG. 4 is an explanatory view when various kinds of vehicles are placed on the roller 3. In the case of a roller width of 700 mm, an inner roller width of 800 mm, a rough road 10 width of 350 mm, and a flat road surface 11 width of 350 mm, for example, Tread is 145
It is possible to support tests on various roads such as 0 mm to 1625 mm treads (each having a tire width of 215 mm) on the rough road 10 and the flat road surface 11.

As described above, the rough road 10 is formed on about half of the surface of the roller 3 in the width direction, and the flat road surface 11 is formed on the other half of the surface. A vehicle running test can be performed by placing the vehicle and driving the vehicle. Further, when switching from the rough road running test to the flat road surface running test, the vehicle is laterally displaced and the tire 12 is simply moved from the rough road 10 to the flat road surface 11.

[0024]

As described above, according to the first aspect of the present invention, the rough road is formed by applying resin to the surface of the roller in a concavo-convex manner. it can. Further, since the resin is lightweight and has a high mounting strength, the rotation speed of the rough road can be increased. Also, since there is no seam on the rough road, no seam sound is produced.

According to the second aspect of the present invention, the roller surface is coated with polyamide in a hot-melt state to form rough roads, and the same effect as that of the first aspect is obtained.

According to the third aspect, the resin is applied on the non-slip tape attached to the roller surface, so that the adhesive strength of the resin to the roller surface can be increased and the rotation speed can be increased. Further, even if the rough road is used for a long period of time and is worn or damaged, the non-slip tape can be peeled off to easily remove the rough road without damaging the roller, which facilitates the repair work.

According to the fourth aspect, the surface of the resin forming the rough road is coated with epoxy, so that the surface hardness can be increased and the wear resistance can be increased.

According to the fifth aspect, the resin forming the rough road is applied through the primer, and the adhesive strength of the resin to the roller surface can be increased and the rotation speed can be increased.

According to the sixth aspect, the rough road is formed in about half of the roller width of the roller surface, and the flat road surface is formed in the remaining half of the roller width. The running test on the rough road and the running test on the flat road surface are performed. Switching becomes easy.

[Brief description of the drawings]

FIG. 1 is a perspective view and a partial front view of a resin coating device according to the present invention.

FIG. 2 is an explanatory diagram of a rough road forming method according to the present invention.

FIG. 3 is a front view of the chassis dynamometer according to the present invention.

FIG. 4 is an explanatory view when various types of vehicles are mounted on the rollers of the chassis dynamometer according to the present invention.

FIG. 5 is a perspective view of a conventional rough cast segment of aluminum casting.

FIG. 6 is a perspective view showing a state in which a conventional rough road segment is attached to a roller.

[Explanation of symbols]

 3 ... Roller 8 ... Dynamometer 10 ... Rough road 11 ... Flat road surface 12 ... Tire 13 ... Non-slip tape 14 ... Primer 15 ... Polyamide 16 ... Epoxy coating 19 ... Nozzle 24 ... Controller 26 ... Programmer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Akira Kitamura Akira 100 Kanayama, Ichiriyama Town, Kariya City, Aichi Prefecture Toyota Auto Body Co., Ltd. Co., Ltd. (72) Inventor Mikio Yamashita 5-21-11 Chiyoda, Naka-ku, Nagoya-shi Aichi Prefecture Chugai Co., Ltd. (72) Takayuki Nitta 5-16-7 Oji, Kita-ku, Tokyo Japan Special paint stock In-house (72) Inventor Ryoji Kamata 2-11-17 Osaki, Shinagawa-ku, Tokyo Stock company Shameidensha (72) Inventor Tsutomu Takizawa 2-11-17 Osaki, Shinagawa-ku Tokyo Stock company Shameidensha

Claims (6)

[Claims] 1. A chassis dynamometer in which a tire of a vehicle is placed on a roller connected to a dynamometer and a running test of the vehicle is carried out. A chassis dynamometer characterized by forming a rough road that simulates 2. The chassis dynamometer according to claim 1, wherein the resin is a hot-melt polyamide. 3. The chassis dynamometer according to claim 1, wherein the resin is applied on a non-slip tape attached to the roller surface. 4. The chassis dynamometer according to claim 1, wherein a surface of the resin is coated with an epoxy resin. 5. The chassis dynamometer according to any one of claims 1 to 4, wherein the resin is applied through a primer. 6. The chassis dynamometer according to claim 1, wherein the rough road is formed in about half of a roller width of a roller surface, and a flat road surface is formed in the remaining about half of the roller width. .