JP6594723B2 - Chassis dynamometer - Google Patents

Description

  The present invention relates to a chassis dynamometer that is used to perform an actual vehicle running test of a vehicle such as an automobile.

The chassis dynamometer includes a plurality of wheel rotation support rollers on which front and rear wheels of a vehicle are mounted, as described in Patent Document 1, for example. An actual vehicle running test is possible by placing the front and rear wheels on this roller and rotating them. In a general driving test, the vehicle does not move greatly in the vehicle width direction on the chassis dynamometer, but irregular irregularities are provided on the roller for supporting the wheel rotation in order to perform a rough road driving test, for example. In such a case, the vehicle may move in the vehicle width direction. Such movement must be appropriately prevented.
Therefore, conventionally, for example, a roller for restricting movement is provided at the outer position in the vehicle width direction of the front wheel of the vehicle, and when the vehicle moves in the vehicle width direction, the roller abuts against the sidewall of the wheel, There is a means to prevent further movement.

  However, according to the prior art, there is room for improvement as described below.

  That is, the movement restricting roller contacts the side wall of the wheel, but the side wall is weak in strength and easily wears. For this reason, if a vehicle running test is carried out for a long time, and the roller for movement restriction abuts on the sidewall for a long time or frequently abuts, and the amount of wear on the sidewall increases, the wheels are damaged and burst. There is a risk of doing. The conventional chassis dynamometer is proactive in this state when the vehicle moves in one direction (right or left of the vehicle) in the vehicle width direction and the side wall of the wheel comes into contact with the movement restriction roller. No function is provided for this, and once such a state is reached, the wheel sidewall and the movement restricting roller remain in contact with each other. For this reason, in the prior art, the movement restricting roller is likely to be in contact with the sidewall for a long time, and the wheel burst is more likely to occur.

JP-A-4-77603

  The present invention has been conceived under the circumstances as described above, and appropriately prevents the vehicle from moving unreasonably large in the vehicle width direction without causing a problem that the wheel is damaged. The problem is to provide a chassis dynamometer that can be used.

  In order to solve the above problems, the present invention takes the following technical means.

The chassis dynamometer provided by the present invention includes a plurality of wheel rotation support rollers on which left and right front wheels and rear wheels of a vehicle are mounted, and the left and right front wheels and rear wheels on the plurality of wheel rotation support rollers. Vehicle width direction movement restricting means for restricting movement of the vehicle in the vehicle width direction when these are rotating, and among the rollers for supporting the wheel rotation , the outer peripheral surface of the roller for the front wheel, the left and right front wheels be vertically and is capable uneven shape, a chassis dynamometer, as the vehicle width direction movement restricting means, said left and right outer peripheral surface A pair of left and right guide rollers that are positioned on the vehicle front side of the left and right rear wheels so as to face the tread surface of the rear wheels and that are rotatable about a substantially horizontal axis extending in the vehicle width direction. cage, these Pairs of guide rollers, the outer peripheral surface so that the diameter as the vehicle width direction outer side is formed as a tapered roller is tapered, when the vehicle moves in the vehicle width direction, of the rear wheel of the right and left One of the tread surfaces is in contact with the tapered outer peripheral surface and pressed toward the rear of the vehicle, so that the vehicle can be turned in the direction opposite to the direction of movement. It is a feature.

According to such a configuration, the following effects can be obtained.
First, when the vehicle moves in the vehicle width direction, the wheels of the vehicle come into contact with guide rollers as taper rollers and are pressed toward the rear side of the vehicle, thereby moving the vehicle in a direction opposite to the direction of movement. Since the vehicle can be turned, the vehicle can be automatically returned to the original position thereafter, and a so-called centering function can be provided. Therefore, it is possible to appropriately prevent the vehicle from being greatly displaced in the vehicle width direction by a predetermined size or more, and the state in which the vehicle is largely moved in one direction in the vehicle width direction may be continued. It can be lost.
Second, the guide roller is in contact with the tread surface of the wheel, but the tread surface of the wheel is strong and hardly wears. For this reason, unlike the prior art in which the roller for movement restriction is brought into contact with the side wall of the wheel, it is possible to prevent a problem that the wheel receives a large damage due to contact with the guide roller and bursts. Can do.

  Other features and advantages of the present invention will become more apparent from the following description of embodiments of the present invention with reference to the accompanying drawings.

An example of a finisher sheet dynamometer is a side view schematically showing. (A) is a schematic top view which shows the relationship between the guide roller as a vehicle width direction movement control means of the chassis dynamometer shown in FIG. 1, and the wheel of a vehicle, (b) is a schematic which shows an example of the effect | action. It is a top view. (A) is a schematic plan view which shows the example of this invention, (b) is a schematic plan view which shows an example of the effect | action.

Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings.
The arrow Fr indicates the front of the vehicle, and the arrow W indicates the vehicle width direction.

  A chassis dynamometer A shown in FIG. 1 is for, for example, a rough road running test, and includes rollers 3 and 4 for front wheels and rear wheels as rollers for supporting wheel rotation of the vehicle 1. A pair of left and right guide rollers 5 for restricting the movement of 1 in the vehicle width direction is further provided.

  The front wheel roller 3 is mounted on the left and right front wheels 2a of the vehicle 1 and can be rotated together with the front wheel 2a. The rear wheel rollers 4 are configured as a pair of front and rear rollers 4 arranged at intervals in the vehicle front-rear direction, and the left and right rear wheels 2 b of the vehicle 1 are dropped between the pair of rollers 4. Thus, the rear wheel 2b can be supported and rotated together with the rear wheel 2b. The rollers 3 and 4 for the front wheels and the rear wheels may be either a method of driving and rotating using a motor or the like and a method of rotating depending on the driving rotation of the front wheel 2a or the rear wheel 2b of the vehicle 1. However, in order to obtain the centering function of the vehicle 1 described later, it is required that both the front and rear rollers 3 and 4 rotate. In addition, the front wheel 2a of the vehicle 1 is a steering wheel, and the rear wheel 2b is a non-steering wheel.

The outer peripheral surface of the front wheel roller 3 has an uneven shape, which makes it possible to realize a rough road running state. The concavo-convex pattern on the outer peripheral surface of the front wheel roller 3 is considered so as to realize the rough road as faithfully as possible. The concavo-convex pattern for moving the left front wheel 2a up and down and the right front wheel 2a up and down. As an uneven pattern for this purpose, there is a region that is not in phase. For this reason, depending on the concavo-convex pattern, a phenomenon occurs in which the vehicle 1 moves to the right or left side in the vehicle width direction.
The ropes 6a and 6b for preventing the vehicle 1 from improperly moving in the front-rear direction are connected to the front portion and the rear portion of the vehicle 1, but the vehicle 1 is displaced up and down in a rough road running test. Therefore, the ropes 6a and 6b are provided with a slack that allows the displacement. Therefore, it is difficult to prevent the vehicle 1 from moving in the vehicle width direction by the ropes 6a and 6b.

  As shown in FIG. 2A, the guide roller 5 is supported by a bracket 7, so that a pair of right and left guide rollers 5 are provided corresponding to the two left and right rear wheels 2 b of the vehicle 1. Each of the guide rollers 5 is provided so that the outer peripheral surface 50 faces the tread surface 20 of the rear wheel 2b, and can be driven to rotate about a substantially horizontal axis CH extending in the vehicle width direction. Each guide roller 5 is formed as a tapered roller having an outer peripheral surface 50 tapered so that the outer diameter gradually increases toward the outer side in the vehicle width direction. When the vehicle 1 moves in the vehicle width direction so as to be displaced from the center Ca of the chassis dynamometer A, the pair of guide rollers 5 is caused by the tapered outer peripheral surface 50 coming into contact with the tread surface 20 of the rear wheel 2b. As will be described later, the vehicle 1 is configured to exhibit the action of returning the vehicle 1 to the center Ca side of the chassis dynamometer A.

  Next, the operation of the above-described chassis dynamometer A will be described.

  First, as shown in FIG. 2A, a running test of the vehicle 1 is performed in a state where the center Cb of the vehicle 1 substantially coincides with the center Ca of the chassis dynamometer A. In the rough road running test in which the outer peripheral surface of the roller 3 is uneven, the vehicle 1 may move in the vehicle width direction. Here, when the vehicle 1 moves to the right side indicated by the arrow WR in FIG. 2A, the tread surface 20 of the right rear wheel 2b is moved to the outer peripheral surface 50 of the right guide roller 5 as shown in FIG. The right rear wheel 2b is pressed toward the front of the vehicle as indicated by an arrow F and displaced in the same direction. For this reason, the vehicle 1 turns (turns) to the left side at a relatively small angle. On the other hand, the front wheel 2a and the rear wheel 2b are rotating and are in the same state as the vehicle 1 is traveling. For this reason, after that, the vehicle 1 moves toward the center Ca of the chassis dynamometer A, and returns to the original initial position. When returning to the original initial position, the rear wheel 2b is in a state of stably falling between the pair of rear wheel rollers 4 and the contact with the guide roller 5 is weakened. When returning to the initial position, basically, the vehicle 1 does not actively move to the left of the original initial position, and settles to the original initial position.

  Although illustration explanation is omitted, contrary to the above, even when the vehicle 1 moves to the left side indicated by the arrow WL in FIG. 2A, the vehicle 1 turns to the right side by the same principle as described above ( (Swivel) and then return to the original initial position. Thus, in the chassis dynamometer A of the present embodiment, even if the vehicle 1 moves in the vehicle width direction, the vehicle 1 is moved to the original position (the vehicle center Cb substantially coincides with the center Ca of the chassis dynamometer A). A centering function for returning to (position) is obtained. Therefore, the rough road running test of the vehicle 1 can be appropriately performed.

The guide roller 5 is provided so as to contact the tread surface 20 of the rear wheel 2b. However, as described above, the tread surface 20 has a high strength and is unlikely to be worn unlike the sidewall. It is. Therefore, there is no problem that the rear wheel 2b is easily damaged (burst or the like) by the guide roller 5 coming into contact with the tread surface 20.

Figure 3 shows an implementation form of the present invention.
In the embodiment shown in the figure, a pair of guide rollers 5 is disposed on the front side of the rear wheel 2 b of the vehicle 1. Further, the outer peripheral surface 50 of the guide roller 5 has a tapered shape in which the guide roller 5 has a smaller diameter toward the outer side in the vehicle width direction, and the taper direction is opposite to the embodiment shown in FIGS. 1 and 2. .

In this embodiment, when the vehicle 1 moves to the right side in the vehicle width direction of the arrow WR in the state shown in FIG. 3A, as shown in FIG. 3B, the left rear wheel 2b The front part comes into contact with the left guide roller 5 and is pushed rearward of the vehicle and displaced in the same direction. For this reason, as in the case shown in FIG. 2B, the vehicle 1 turns to the left. As a result, the vehicle 1 thereafter moves to the left in the vehicle width direction and returns to the original position shown in FIG. Although description is omitted, in the state shown in FIG. 3A, the same centering function as described above can be obtained when the vehicle moves to the left in the vehicle width direction of the arrow WL .

  The present invention is not limited to the contents of the above-described embodiment. The specific configuration of each part of the chassis dynamometer according to the present invention can be modified in various ways within the intended scope of the present invention.

In a state where the front wheel 2a is a steering wheel and the direction of the front wheel 2a is freely changed, even if the guide roller 5 is brought into contact with the front wheel 2a, the direction of the front wheel 2a is merely changed. The overall direction of the vehicle 1 does not change, and it is difficult to obtain the centering function described above. However, for example, if the steering wheel is locked and the direction of the front wheel 2a is not easily changed (similar to a non-steering wheel), the guide roller is brought into contact with the front wheel 2a as described above. A similar centering function can be obtained.
In the present invention, it is preferable to provide a configuration in which the guide roller is brought into contact with the non-steering wheel among the wheels of the vehicle, since it is not necessary to lock the steering wheel in the same state as the non-steering wheel.

In the embodiment described above, since the vertical movement of the rear wheel 2b is small compared to the front wheel 2a, there is also an advantage that the guide roller 5 can be stably brought into contact with the rear wheel 2b .

The guide roller referred to in the present invention may not have the entire outer peripheral surface tapered, and for example, a non-tapered surface region may be provided in a part thereof. Further, the taper surface is not limited to a taper surface having a linear gradient, and may be a taper surface having a curved gradient .

A Chassis dynamometer CH shaft (substantially horizontal extending in the vehicle width direction)
1 Vehicle 2a Front wheel
2b Rear wheel (wheel)
20 Tread surface 3 Front wheel roller (wheel rotation support roller)
4 Rear wheel roller (wheel rotation support roller)
5 Guide roller 50 outer peripheral surface

Claims (1)

A plurality of wheel rotation support rollers on which the left and right front wheels and rear wheels of the vehicle are mounted;
Movement in the vehicle width direction for restricting movement of the vehicle in the vehicle width direction when the left and right front wheels and the rear wheel are placed on the plurality of wheel rotation support rollers and are rotating. Regulatory measures,
Equipped with a,
Of the wheel rotation support rollers, an outer peripheral surface of the front wheel roller is a chassis dynamometer, which has an uneven shape capable of moving the left and right front wheels up and down ,
As the vehicle width direction movement restricting means, the outer peripheral surface is located on the vehicle front side of the rear wheel of the right and left so as to face the tread surface of the rear wheel of the right and left, and a substantially horizontally extending in the vehicle width direction It has a pair of left and right guide rollers that can rotate around its axis.
The pair of guide rollers is formed as a tapered roller whose outer peripheral surface is tapered so that the outer diameter in the vehicle width direction is smaller, and the left and right rear wheels are moved when the vehicle moves in the vehicle width direction. One of the tread surfaces is in contact with the tapered outer peripheral surface and pressed toward the rear of the vehicle, so that the vehicle can be turned in the direction opposite to the direction of movement. A chassis dynamometer characterized by

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