JP6917228B2 - Constant temperature bath, test system, and test method - Google Patents

Description

The present invention relates to a constant temperature bath, a test system using this constant temperature bath, and a test method.

Conventionally, the test of the vehicle drive system may be performed in a state where the vehicle drive system is housed in a temperature-controllable constant temperature bath. In such a case, since the vehicle drive system is supported by the test bench in the test, the constant temperature bath is assembled in a state where the vehicle drive system is supported by the test bench.

However, if the constant temperature bath is assembled while the vehicle drive system is supported by the test bench, the test bench is occupied during the assembly, and the occupied time of the test bench in the entire test including preparation becomes long. .. In addition, since the constant temperature bath must be assembled in a state where the test bench is located below the vehicle drive system, the assembly work takes time and effort.
These problems also occur when the constant temperature bath is removed, such as after the test is completed.

As a constant temperature bath for accommodating a vehicle drive system, Patent Document 1 describes one having casters, for example, a chamber in which a hybrid motor is accommodated and configured to be movable to a test stand of a dynamometer.

However, when trying to accommodate the vehicle drive system in such a constant temperature bath, the vehicle drive system is much heavier than the motor, so that the casters and their peripheral members require considerable mechanical strength. It is not possible to accommodate a heavy vehicle drive system in a constant temperature bath.

Japanese Unexamined Patent Publication No. 2012-18137

Therefore, the present invention has been made to solve the above-mentioned problems at once, and provides a constant temperature bath that is easy to assemble and remove and can accommodate a specimen such as a heavy vehicle drive system. The main task is to provide the test bench and shorten the occupancy time of the test bench.

That is, the constant temperature bath according to the present invention is a vehicle or a part thereof, and is a constant temperature tank that houses a specimen having at least an axle, and is movably supported by wheels connected to the axle of the specimen. It is characterized by that.

In such a constant temperature bath, it is movably supported by wheels connected to the axle of the specimen, so it can be assembled in a place different from the test bench and moved to the test bench together with the specimen, or it can be used after the test. It can be moved to a place other than the test bench and removed together with the test body. As a result, the occupancy time of the test bench can be shortened as compared with the conventional case.
In addition, the constant temperature bath can be assembled and removed in a place other than the test bench, so that the test bench does not interfere with those tasks, and the labor and time of those tasks can be reduced. ..
Moreover, since the load of the specimen is supported by the wheels, the constant temperature bath can accommodate the heavy specimen.

It is preferable that the specimen has a peripheral wall portion arranged around the specimen, and an axle through hole through which the axle penetrates is formed in the peripheral wall portion.
With such a configuration, the constant temperature bath can be movably supported by extending the axle from the through hole for the axle to the outside of the constant temperature bath and connecting it to the wheels, so that it is easy to assemble the movable constant temperature bath. Can be.
Moreover, since almost the entire specimen can be housed in the constant temperature bath, almost the entire specimen can be kept at a uniform temperature.

It is preferable that the specimen is provided with an input shaft into which a driving force from a power source is input, and an input shaft through hole through which the input shaft penetrates is formed in the peripheral wall portion.
With such a configuration, the input shaft can be extended from the through hole for the input shaft to the outside of the constant temperature bath and connected to, for example, a drive dynamometer that simulates the behavior of the engine. As a result, it can be used not only for a 2-axis or 4-axis test system but also for a 3-axis or 5-axis test system.

Since the size of the specimen varies depending on the length of the wheelbase of the vehicle, for example, if the constant temperature bath is designed assuming that a large specimen is accommodated, the constant temperature is used when testing a small specimen. The internal space of the tank is larger than necessary, and it is not possible to control the temperature efficiently.
Therefore, in order to enable efficient temperature control regardless of the size of the specimen, a front case for accommodating at least the front side of the specimen and a rear case for accommodating at least the rear side of the specimen are provided. It is preferable that one of the front case and the rear case is slidable with respect to the other and is expandable and contractible along the front-rear direction of the specimen.

The test system according to the present invention includes the above-mentioned constant temperature bath, the wheels connected to the axle of the specimen and movably supporting the constant temperature bath, and a dynamometer for applying a load to the axle. It is characterized by that.
With such a test system, it is possible to obtain effects such as shortening the occupancy time of the test bench as described above.

As an embodiment for connecting the axle and the dynamometer, as the wheel, the axle is connected from one side, and the rotary connection portion to which the dynamometer is connected from the other side and the rotary connection portion. An aspect of using a tire having a tire that maintains a stationary state regardless of rotation can be mentioned.
If such wheels are used, for example, after assembling a constant temperature bath in a place different from the test bench and moving it to the test bench together with the specimen, simply connecting the dynamometer to the above-mentioned rotating connection part of the wheel is enough to connect the axle. And the dynamometer can be easily connected.

On the other hand, when an ordinary wheel is used without using a special wheel having the above-mentioned rotary connection portion, as an embodiment for connecting the axle and the dynamometer, the wheel is removed from the axle. In this state, the dynamometer may be connected to the axle.

The dynamometer is a pair of axle dynamometers that apply a load to the front wheel axles to which the front wheels are connected, or a pair of axle dynamometers that apply a load to the rear wheel axles to which the rear wheels are connected. It is preferred that the system further comprises a driving dynamometer connected to an input shaft to which the driving force from the power source is input.
With such a configuration, not only the test in the state where the engine or the motor is connected to the specimen but also the test in the state where the engine or the motor is not connected can be performed.

If the vehicle drive test system is further provided with an automatic driving device that is arranged above the constant temperature bath and operates the vehicle pedals, for example, a test in which the specimen is driven according to a preset running pattern or the like can be performed. It can be carried out.

It is preferable that a part of the constant temperature bath is a chassis of a vehicle or a simulation of a chassis of a vehicle.
With such a configuration, the constant temperature bath can be brought closer to the actual vehicle. For example, when the above-mentioned automatic driving device is used, it corresponds to the driver's seat without newly providing a place for arranging the automatic driving device. It is possible to flexibly respond to various tests, such as arranging it in a place where it is to be used.

Further, the test method according to the present invention is a vehicle or a part thereof, and a specimen having at least an axle is housed inside a constant temperature bath, and the constant temperature bath is moved by wheels connected to the axle of the specimen. It is a method characterized in that the constant temperature bath is moved together with the specimen between a test position for testing the specimen and a preparation position away from the test position so as to be supported as possible.
With such a test method, as described above, the occupancy time of the test bench can be shortened, and the work of assembling and removing the constant temperature bath can be simplified.

According to the present invention configured as described above, it is possible to provide a constant temperature bath which is easy to assemble and remove and can be manufactured at low cost, and can shorten the occupancy time of the test bench.

The schematic diagram which shows the structure of the test system of this embodiment. The schematic diagram which shows the structure of the constant temperature bath of the same embodiment. The flowchart which shows the test method of the same embodiment. The schematic diagram which shows the structure of the constant temperature bath of a modified embodiment.

The test system according to the present invention will be described below.

<System configuration>
The test system of the present embodiment is a vehicle drive system test system 100 that tests the performance and the like of a vehicle drive system PT (power train PT) of an engine vehicle, an electric vehicle, a hybrid vehicle, etc., and as shown in FIG. It includes a plurality of axle dynamometers 10 for applying a load to the axle X1 of the drive system PT, wheels 20 connected to the axle X1, and a constant temperature bath 30 for accommodating the vehicle drive system PT.
The vehicle drive system PT referred to here is at least a part of a power transmission system that transmits power from a power source such as an engine or a motor to the wheels 20, and includes at least an axle X1. As a specific vehicle drive system PT, a vehicle equipped with at least one such as a transmission, a propeller shaft, a differential gear, an axle, a drive shaft, and a speed reducer can be mentioned. Further, the axle X1 referred to here is at least a part of a rotating shaft that transmits power from a drive source such as an engine or a motor to the wheels 20, and is, for example, an axle or a drive shaft.

The axle dynamometer 10 is for applying a load to the axle X1 and measuring the power output from the axle X1. For example, the axle X1 of a completed vehicle during actual driving is controlled by a control device (not shown). A simulated load simulating the load applied to the vehicle drive system PT is applied to the axle X1 of the vehicle drive system PT.
Here, four axle dynamometers 10 are mounted on the base Z corresponding to the respective axles X1 to which the left and right front wheels and the left and right rear wheels are connected. If the vehicle drive system PT is for a front-wheel drive or rear-wheel drive two-wheel drive vehicle, two axle dynamometers 10 may be used in correspondence with the axle X1 to which the front wheels or the rear wheels are connected. ..

The vehicle drive system test system 100 of the present embodiment uses a 4-axle or 2-axle system provided with 4 or 2 axle dynamometers 10 described above to provide a 5-axle or 3-axis system. It is designed to be constructed, and further includes a drive dynamometer 40 connected to an input shaft X2 of a vehicle drive system PT to which a driving force from a power source is input.
The drive dynamometer 40 is controlled by a control device (not shown) to give a simulated load simulating the behavior of a power source to the input shaft X2. For example, the drive dynamometer 40 is connected to the input shaft X2 of a transmission. It is arranged on the table Z.

The wheels 20 rotatably support the axle X1 and support the load of the vehicle drive system PT. Specifically, the axle X1 is connected from one side in the axial direction and the dynamometer is connected from the other side in the axial direction. It has a rotary connection portion 21 to which a meter is connected, and a tire 22 that maintains a stationary state regardless of the rotation of the rotary connection portion 21.
The wheel 20 of the present embodiment uses a so-called free wheel hub, and the hub constitutes the rotary connection portion 21. As a result, when the axle X1 rotates, the rotation connection portion 21 rotates without rotating the tire 22.

The constant temperature bath 30 is formed as an accommodation space S for accommodating a specimen such as a vehicle drive system PT, and the accommodation space S is configured to be heat-retainable.
Specifically, the constant temperature bath 30 is formed of a metal such as resin or aluminum, and as shown in FIG. 2, the peripheral wall portion 31 arranged around the vehicle drive system PT and the vehicle drive system PT It has an upper wall portion 32 arranged above and a lower wall portion 33 provided below the vehicle drive system PT. The space surrounded by the peripheral wall portion 31, the upper wall portion 32, and the lower wall portion 33 is the accommodation space S. A heat insulating member may be provided on the inner surface of the constant temperature bath 30.
Then, a duct is connected to the temperature control gas supply port h3 formed at one or a plurality of locations (here, one location of the lower wall portion 33) of the peripheral wall portion 31, the upper wall portion 32, and the lower wall portion 33 to heat the temperature. By supplying the gas adjusting gas to the accommodating space S, the accommodating space S is temperature-controlled to a predetermined temperature. As the temperature control gas, for example, air whose temperature has been adjusted to −30 ° C. or the like is used.

The constant temperature bath 30 of the present embodiment includes a front side case 30a accommodating at least the front side of the vehicle drive system PT and a rear side case 30b accommodating at least the rear side of the vehicle drive system PT.
The front case 30a and the rear case 30b have, for example, a substantially rectangular parallelepiped shape, the front case 30a has an opening ha formed toward the rear case 30b, and the rear case 30b faces the front case 30a. Has an opening hb formed in the above.
One opening ha, hb of the front case 30a or the rear case 30b is larger than the other of the front case 30a or the rear case 30b, and here the opening hb of the rear case 30b is larger than the front case 30a. The rear side of the front case 30a is fitted into the accommodation space S of the rear case 30b through the opening hb of the rear case 30b, and in this state, one of the front case 30a or the rear case 30b is relative to the other. It is possible to slide. As a result, the constant temperature bath 30 of the present embodiment can be expanded and contracted along the front-rear direction of the vehicle drive system PT, and the total length can be changed.

Therefore, the constant temperature bath 30 of the present embodiment is movably supported by the wheels 20 described above.
More specifically, the peripheral wall portion 31 is formed with an axle through hole h1 through which the axle X1 penetrates, and the axle X1 of the vehicle drive system PT is passed through the axle through hole h1 to form a constant temperature bath. The 30 is supported by the axle X1 and as a result is supported by the wheels 20 connected to the axle X1. More specifically, for example, the axle X1 is provided with a bearing B such as a ball bearing that rotatably supports the axle X1, and by locating the bearing B in the axle through hole h1, the constant temperature bath 30 can be formed. It is in contact with the outer peripheral surface of the bearing B and is supported by the axle X1. Further, the method of supporting the constant temperature bath 30 may be appropriately changed, such as connecting a suspension arm or the like to the vehicle drive system PT and causing the suspension arm or the like to support the constant temperature tank 30.

In the present embodiment, axle through holes h1 corresponding to the axle X1 to which the front wheels and the rear wheels are connected are formed on the left and right side surfaces of the peripheral wall portion 31, respectively. More specifically, the axle through hole h1 corresponding to the front wheels is formed on the side surface of the front side case 30a, and the axle through hole h1 corresponding to the rear wheels is formed on the side surface of the rear side case 30b.

Further, the peripheral wall portion 31 of the present embodiment is formed with an input shaft through hole h2 through which the input shaft X2 of the vehicle drive system PT penetrates. Specifically, an input shaft through hole h2 is formed on the front surface of the peripheral wall portion 31, that is, on the front surface of the front case 30a, and the input shaft X2 of the transmission is used for driving through the input shaft through hole h2. It is configured so that the dynamometer 40 can be connected.

<Test method>
Next, an example of the test method using the constant temperature bath 30 described above will be described with reference to the flowchart of FIG. The test mentioned here includes the main test for evaluating the performance of the vehicle drive system PT, the work before assembling the constant temperature bath 30 before the main test, and the removal of the constant temperature tank 30 after the main test. It is a concept that includes post-work.

1. 1. Pre-work First, the constant temperature bath 30 is assembled in another preparation position away from the test bench which is the test position.

Specifically, first, the lower wall portion 33 of the constant temperature bath 30 is carried to the preparation position, and the vehicle drive system PT is placed on the lower wall portion 33 in a state where the lower wall portion 33 is lifted upward from the floor surface and supported. (S11). At this time, for example, the transmission of the vehicle drive system PT is positioned at a predetermined position on the lower wall portion 33.

Next, the peripheral wall portion 31 is attached to the lower wall portion 33. At this time, it is necessary to pass the axle through holes h1 formed on the left and right side surfaces of the peripheral wall portion 31 through the axle X1, and at least the left and right side surfaces of the peripheral wall portion 31 are separate bodies from each other. In the present embodiment, the axle through holes h1 formed on the left and right side surfaces of the front case 30a are passed through the axle X1 to which the front wheels are connected, and the axle through holes h1 formed on the left and right side surfaces of the rear case 30b. Is passed through the axle X1 to which the rear wheels are connected (S12). At this time, the left and right side surfaces are in a state of being supported by the axle X1 (specifically, the bearing B of the axle X1).

Further, in the present embodiment, it is necessary to pass the input shaft through hole h2 formed on the front surface of the peripheral wall portion 31 through the input shaft X2 of the vehicle drive system PT, and the front surface and the left and right side surfaces are separate bodies. The peripheral wall portion 31 is formed by passing the input shaft through hole h2 formed on the front surface through the input shaft X2 of the vehicle drive system PT and attaching the front surface to the left and right side surfaces and attaching the back surface to the left and right side surfaces (S13). ).

Subsequently, the constant temperature bath 30 is assembled by attaching the upper wall portion 32 to the peripheral wall portion 31, and the vehicle drive system PT is accommodated in the accommodation space S (S14).

When the constant temperature bath 30 is assembled at the preparation position, the wheels 20 are attached to the axle X1 extending outward from the constant temperature tank 30 (S15). The wheel 20 here uses a free wheel hub as described above.

Then, the vehicle drive system PT to which the wheels 20 are connected is lowered together with the constant temperature bath 30, and the wheels 20 are landed on the floor surface. As a result, the constant temperature bath 30 is movably supported by the wheels 20. Then, in order to carry out the main test, the vehicle drive system PT is moved from the preparation position to the test bench in the test position together with the constant temperature bath 30 (S16).

2. This test After moving the vehicle drive system PT to the test bench, the axle dynamometer 10 is applied to the wheels 20 connected to the axle X1 in order to apply the load from the axle dynamometer 10 to the axle X1 of the vehicle drive system PT. Is connected (S17). After removing the wheel 20 connected to the axle, the axle dynamometer 10 may be connected to the axle X1.
Further, in the present embodiment, for example, the drive dynamometer 40 is connected to the input shaft X2 of the transmission (S18).

Then, a duct is connected to a temperature control gas supply port (not shown) formed in the constant temperature bath 30 to supply the temperature control gas to the accommodation space S, and the temperature of the constant temperature tank 30 is adjusted to a predetermined temperature (S19). The supplied temperature control gas is discharged to the outside of the constant temperature bath 30 from the axle through hole h1 and the input shaft through hole h2 described above.

After that, the performance test of the vehicle drive system PT is performed by controlling the axle dynamometer 10 and the drive dynamometer 40 with a control device (not shown) (S20).

3. 3. After the post-work test is completed, the vehicle drive system PT is moved from the test bench to another place (for example, the above-mentioned preparation position) together with the constant temperature bath 30 (S21).

Then, for example, the constant temperature bath 30 is removed according to the reverse procedure of the above-mentioned previous work.
Specifically, the upper wall portion 32 of the constant temperature bath 30 is removed from the peripheral wall portion 31 (S22), the back surface, the front surface and the left and right side surfaces of the peripheral wall portion 31 are removed from the lower wall portion 33 (S23), and the lower wall portion 33 is formed. The test is completed by lowering the mounted vehicle drive system PT to another location (S24).

According to the vehicle drive system test system 100 according to the present embodiment configured in this way, the constant temperature bath 30 is movably supported by the wheels 20 connected to the axle X1 of the vehicle drive system PT, and thus is tested. It can be assembled in a place different from the bench and moved to the test bench together with the vehicle drive system PT, or it can be moved to a place different from the test bench together with the vehicle drive system PT after the test and removed. As a result, the occupancy time of the test bench can be shortened as compared with the conventional case.
Further, since the constant temperature bath 30 can be assembled or removed in a place different from the test bench, the test bench does not interfere with those operations, and the labor and time of those operations can be reduced.
Moreover, since the load of the vehicle drive system PT is supported by the wheels 20, a heavy vehicle drive system PT can be accommodated in the constant temperature bath 30.

Further, the axle through hole h1 is passed through the axle X1 to support the left and right side surfaces of the peripheral wall portion 31 on the axle X1, and then the front surface and the back surface are attached to the side surfaces to form the peripheral wall portion 31, and the peripheral wall portion 31 is above the peripheral wall portion 31. Since the constant temperature bath 30 can be assembled by attaching the wall portion 32, the assembling work is easy, and of course, the removal work of the constant temperature bath 30 is also easy.

Further, since only a part of the axle X1 and the input shaft X2 extends to the outside from the constant temperature bath 30, and almost the entire vehicle drive system PT is housed in the constant temperature tank 30, the vehicle drive system PT Almost the whole can be kept at a uniform temperature.

Further, since the input shaft X2 of the vehicle drive system PT and the drive dynamometer 40 can be connected to each other through the input shaft through hole h2 formed on the front surface of the peripheral wall portion 31, it is for 4 axes or 2 axes. It is possible to construct a system for 5 axes or 3 axes without significantly changing this system by using the system of.

In addition, since the free wheel hub is used for the wheels 20, the user pushes the constant temperature bath 30 without using the power from a power source such as an engine or a motor to move the vehicle drive system PT together with the constant temperature tank 30. Can be made to.

Furthermore, since the constant temperature bath 30 is configured to expand and contract along the front-rear direction of the vehicle drive system PT, the length of the constant temperature bath 30 depends on the size of the vehicle drive system PT, that is, the length of the wheelbase of the vehicle. Can be changed. Thereby, for example, when testing a vehicle drive system PT having a small size, the temperature can be efficiently controlled in the accommodation space S by reducing the accommodation space S of the constant temperature bath 30.

The present invention is not limited to the above embodiment.

For example, the constant temperature bath 30 is for constructing a vehicle drive system test system 100 for 5 axes or 3 axes in the above embodiment, but is for constructing a vehicle drive system test system for 2 axes or 4 axes. It may be.
In this case, in order to prevent the temperature control gas from being discharged from the input shaft through hole h2 formed in the peripheral wall portion 31, the input shaft through hole may be closed by, for example, a lid, or the input shaft may be formed as the peripheral wall portion 31. Those having no through hole h2 may be used.

In the constant temperature bath 30 of the above embodiment, the lower wall portion 33, the peripheral wall portion 31, and the upper wall portion 32 are separate bodies, but for example, a part of the peripheral wall portion 31 and the lower wall portion 33 may be integrated. A part of the peripheral wall portion 31 and the upper wall portion 32 may be integrated. Further, although the left and right side surfaces of the peripheral wall portion 31 of the above embodiment are separate bodies, for example, the left and right side surfaces may be integrated via the front surface and the back surface, and the left and right side surfaces, the front surface, and the back surface are integrated. It is not limited whether it is a separate body or a separate body.

Further, the constant temperature bath 30 of the above embodiment is divided into two cases, a front side case 30a and a rear side case 30b, but it may be composed of a single case or divided into three or more cases. It may have been done.

Moreover, although the constant temperature bath 30 of the above embodiment has a substantially rectangular parallelepiped shape, the shape of the constant temperature bath 30 may be changed as appropriate.
Specifically, as shown in FIG. 4, the constant temperature bath 30 includes a chassis of a vehicle or a chassis of a vehicle (hereinafter, simply referred to as a chassis 30S). Specifically, the constant temperature bath 30 has a chassis 30S provided above the vehicle drive system PT and a bottom wall portion provided below the vehicle drive system PT and forming a storage space S between the chassis 30S. At least I have. Considering the temperature control performance of the accommodation space S, it is preferable that the chassis 30S is provided with a heat insulating member, and the bottom wall portion is formed of, for example, a heat insulating member.

In addition, in the above embodiment, the free wheel hub is used to connect the axle dynamometer to the wheel provided with the rotating connection portion, but for example, a wheel not provided with the rotating connecting portion as used in an actual vehicle is used. You may use it. In this case, after removing the wheels from the axle of the vehicle drive system, the axle dynamometer may be connected to the axle.

Further, the assembling and removing work of the constant temperature bath 30 is not limited to the above-described embodiment, for example, after attaching the front surface of the peripheral wall portion 31 to the lower wall portion 33, attaching the left and right side surfaces of the peripheral wall portion 31 and the like. , The procedure may be changed as appropriate.

Further, the vehicle drive test system may include, for example, an automatic driving device for operating a vehicle pedal such as an accelerator pedal, a brake pedal, or a clutch pedal, or a shift lever.
It is conceivable that this automatic driving device is arranged above the constant temperature bath 30, for example. As a specific embodiment, if the chassis 30S of the vehicle is used as a part of the constant temperature tank 30 as described above, the automatic driving device is used. Can be arranged at the installation location of the driver's seat in the chassis 30S, for example, without newly providing the arrangement location of the above.

In the above embodiment, the test system of the present invention has been described as a vehicle drive system test system 100 for testing the performance of the vehicle drive system PT, but the test system of the present invention has, for example, a state in which an engine is connected to the vehicle drive system PT. May be used to test exhaust gas in. Further, the test system of the present invention may be used for performance evaluation and exhaust gas test of a completed vehicle.

Further, the constant temperature bath 30 according to the present invention may accommodate the vehicle drive system PT and a drive source such as an engine connected to the vehicle drive system PT, or may accommodate a completed vehicle. May be good.

In addition, the present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made without departing from the spirit of the present invention.

100 ・ ・ ・ Vehicle drive system test system PT ・ ・ ・ Vehicle drive system X1 ・ ・ ・ Axle X2 ・ ・ ・ Input shaft 10 ・ ・ ・ Axle dynamometer 20 ・ ・ ・ Wheel 30 ・ ・ ・ Constant temperature bath S ・ ・ ・Accommodation space 31 ・ ・ ・ Peripheral wall part h1 ・ ・ ・ Through hole for axle h2 ・ ・ ・ Through hole for input shaft 40 ・ ・ ・ Drive dynamometer

Claims (10)

A constant temperature bath that houses a vehicle or a part thereof, and at least an axle-equipped specimen.
It is a constant temperature bath that is movably supported by wheels connected to the axle of the specimen.
It has a peripheral wall portion arranged around the specimen and has a peripheral wall portion.
A constant temperature bath in which an axle through hole through which the axle penetrates is formed in the peripheral wall portion. The specimen is provided with an input shaft into which a driving force from a power source is input.
Thermostat of claim 1, wherein the input shaft through-hole through which the input shaft penetrates the peripheral wall portion is formed. A constant temperature bath that houses a vehicle or a part thereof, and at least an axle-equipped specimen.
It is a constant temperature bath that is movably supported by wheels connected to the axle of the specimen.
A front case that houses at least the front side of the specimen and
A rear case for accommodating at least the rear side of the specimen is provided.
A constant temperature bath in which one of the front case and the rear case is slidable with respect to the other, and is configured to be expandable and contractible along the front-rear direction of the specimen. The constant temperature bath according to any one of claims 1 to 3 and the constant temperature bath.
The wheels, which are connected to the axle of the specimen and movably support the constant temperature bath,
A test system including a dynamometer that applies a load to the axle. The wheels
A rotary connection portion to which the axle is connected from one side and the dynamometer is connected from the other side.
The test system according to claim 4 , further comprising a tire that maintains a stationary state regardless of the rotation of the rotary connection portion. The test system according to claim 4 , wherein the dynamometer is connected to the axle in a state where the wheel is removed from the axle. The dynamometer is a pair of axle dynamometers that apply a load to the front wheel axles to which the front wheels are connected, or a pair of axle dynamometers that apply a load to the rear wheel axles to which the rear wheels are connected.
The test system according to any one of claims 4 to 6 , further comprising a driving dynamometer connected to an input shaft to which a driving force from a power source is input. The test system according to any one of claims 4 to 7 , further comprising an automatic driving device that is arranged above the constant temperature bath and operates a vehicle pedal. The portion of the thermostatic chamber, the test system according to any one of claims 4 to 8 is a chassis of the vehicle. A specimen that is a vehicle or a part thereof and has at least an axle is housed inside a constant temperature bath.
The constant temperature bath is movably supported by wheels connected to the axle of the specimen.
It is a test method in which the constant temperature bath is moved together with the specimen between a test position for testing the specimen and a preparation position away from the test position.
A test method in which the constant temperature bath has a peripheral wall portion arranged around the specimen, and an axle through hole through which the axle penetrates is formed in the peripheral wall portion.

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