JP6191729B2 - Specimen test equipment - Google Patents

Description

The present invention relates to a specimen test apparatus including a dynamo that applies a test load to a specimen such as a motor.

2. Description of the Related Art Conventionally, a specimen test apparatus including a dynamo that applies a test load to a specimen such as a motor, an intermediate bearing to which a rotating shaft of the specimen is connected, and a torque meter disposed between the dynamo and the intermediate bearing. It has been known. Here, the torque meter is composed of a strain generating portion in which distortion occurs due to torsion of the rotating shaft due to rotation of the dynamo and the specimen, and a strain sensor that detects strain of a strain gauge attached to the strain generating portion, It is possible to measure various characteristics such as transmission torque with respect to the rotational speed of the specimen by converting the strain into an electric quantity by the strain sensor.

In such a specimen test device, when the test specimen, torque meter, intermediate bearing, and dynamo are connected in series, the test specimen, intermediate bearing, torque meter, and dynamo are compared in series. Thus, since the torque meter is not affected by the mechanical loss (mechanical loss) of the intermediate bearing, the measurement accuracy of the torque meter is improved. However, if it is the above-mentioned structure, it will become easy to receive to the influence of heat_generation | fever of a test body and an intermediate bearing, and it is requested | required that temperature management of a torque meter should be performed appropriately. In particular, since the strain sensor normally operates properly only within a predetermined temperature range, it is necessary to manage the temperature of the torque meter within the temperature range defined by the strain sensor.

Patent Document 1 prepares a map and a table in which temperature drift characteristics and temperature-rated torque characteristics, which are fluctuations in the ambient temperature of the torque meter, are measured in advance, and based on these characteristics and the current temperature of the torque meter. Thus, a technique is disclosed in which the ratio of the current temperature drift included in the torque detection signal and the rated torque characteristic is extracted to correct the torque detection signal.

Japanese Patent Laid-Open No. 2003-130751

However, in the configuration in which the detection signal of the torque meter is corrected based on the temperature drift characteristic or the temperature-rated torque characteristic, a map and a table in which these characteristics are measured in advance must be prepared, and calculation of the correction process is performed. There is a demerit that it takes a lot of time and time. Furthermore, if the rotation speed is different, the map and table to be referred to at the time of correction processing are also different. Therefore, if a considerable number of maps and tables are not prepared, appropriate correction processing can be performed according to all rotation speeds. This is also disadvantageous.

The present invention has been made paying attention to such a problem, and the main purpose is to provide a specimen capable of realizing highly accurate torque control by preventing / suppressing the occurrence of temperature drift of the torque meter itself. It is to provide a test apparatus.

That is, the present invention includes a dynamo that applies a test load to the specimen, a torque meter that directly connects the rotating shaft of the specimen, and an intermediate bearing that is disposed between the dynamo and the torque meter. The present invention relates to a specimen testing apparatus in which a rotating shaft of a specimen is connected concentrically with a torque meter and an intermediate bearing. Here, examples of the specimen include automobile parts such as a generator, an electric motor, and a transmission regardless of whether the specimen is for an electric vehicle. In particular, examples of the specimen include an automobile part for an electric vehicle, and preferably an electric vehicle motor.

The specimen test apparatus according to the present invention includes a thermostatic chamber that covers the torque meter and a blower that supplies temperature-controlled air, and suppresses temperature drift of the torque meter due to the ambient temperature of the torque meter. Thus, the thermostatic chamber is provided so as to surround a rotating shaft connected to the torque meter, and temperature-controlled air is supplied from the blower to the thermostatic chamber.

With such a specimen test device, the temperature of the torque meter can be stabilized even if the temperature from the specimen and the bearing is transferred to the torque meter and the temperature of the torque meter can fluctuate, Highly accurate torque control can be performed without being affected by temperature drift . In particular, in the present invention, if a specimen test apparatus including a thermostatic chamber covering at least the torque meter is configured, not only the torque meter but also the temperature around the torque meter can be maintained at a temperature corresponding to the temperature-controlled air. Also, temperature drift of the torque meter due to fluctuations in the ambient temperature of the torque meter can be prevented / suppressed. An appropriate test result relating to the specimen can be obtained by the specimen testing apparatus of the present invention capable of performing various performance tests relating to the specimen under such highly accurate torque control. In addition, with such a test apparatus, for example, a map in which each characteristic is measured in advance compared to a configuration in which a detection signal of a torque meter is corrected based on a temperature drift characteristic or a temperature-rated torque characteristic measured in advance. There is no need to prepare a table, a complicated correction process for correcting the detection signal of the torque meter is unnecessary, and this is advantageous in that it can be applied to a known specimen test apparatus relatively easily.

Preferably, the temperature-controlled air controlled by the temperature-controlled air control unit is applied to the torque meter with a blower at a predetermined temperature set so that the temperature of the torque meter falls within the temperature range defined by the strain sensor.

Further, as the measuring means, for example, it can be configured only by a torque meter temperature measuring unit that directly measures the temperature of the torque meter, but it can also be configured by a measuring unit that indirectly measures the temperature of the torque meter. Is possible. As an example of a measurement unit (a measurement unit that indirectly measures the temperature of the torque meter) that constitutes the latter measurement means, a supply temperature adjustment air measurement unit that measures the temperature of temperature adjustment air supplied from a blower, or a constant temperature An example is a thermostatic chamber measurement unit that measures the temperature in the bath. And, when the measuring means has at least one of the supply temperature control air measurement unit and the thermostatic chamber measurement unit as a measurement unit for indirectly measuring the temperature of the torque meter, temperature control air control As the unit, one that controls the temperature of the temperature-controlled air supplied from the blower based on the measurement result of at least one of the supply temperature-controlled air measurement unit and the constant-temperature bath measurement unit can be applied.

In addition, a thermal insulator can be interposed between at least one of the shaft on the specimen side and the shaft on the intermediate bearing side that are directly connected to the torque meter and the torque meter. If such a configuration is adopted, heat is not transmitted to the torque meter from at least one of the specimen or the intermediate bearing having the shaft interposed between the thermal insulator and the torque meter, or extremely difficult to transmit, The adjustment range when controlling the temperature of the temperature-controlled air to a predetermined temperature by the temperature-controlled air control unit is also relatively small, which is preferable.

In addition, if the intermediate bearing itself is provided with an oil cooling means for oil cooling, the heat generation of the intermediate bearing itself can be suppressed by the oil cooling means, and the effect that the torque meter is affected by the heat generation from the intermediate bearing is effective. Can be reduced.

Another aspect of the present invention includes a dynamo that gives a test load to the specimen, a torque meter provided between the specimen and the dynamo, a thermostat that covers the torque meter, and a specimen side that is one end of the torque meter. A test specimen testing apparatus in which a first rotary shaft to be connected and a second rotary shaft connected to a dynamo side which is the other end of the torque meter and supported by a bearing are concentrically connected via a torque meter. The specimen is an automobile part for an electric vehicle, and the thermostatic chamber surrounds the first rotating shaft and the second rotating shaft so as to suppress the temperature drift of the torque meter due to the fluctuation of the ambient temperature of the torque meter. And a blower for supplying temperature-controlled air into the thermostatic chamber.

According to the present invention, it is possible to provide a specimen test apparatus that can stabilize the temperature of the torque meter, prevent / suppress the occurrence of temperature drift of the torque meter, and realize highly accurate torque control. .

1 is an overall schematic diagram of a specimen test apparatus according to an embodiment of the present invention.

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

A specimen test apparatus X according to the present embodiment is, for example, as shown in FIG. 1, a dynamo 1 (also referred to as “dynamometer”) that applies a pseudo load to a specimen M accompanied by a rotating operation of a motor of an electric vehicle, for example. The torque meter 2 with the rotation axis M1 (first rotation axis) of the specimen M connected to one end, the intermediate bearing 3 disposed between the torque meter 2 and the dynamo 1, and the intermediate bearing 3 are rotatable. An intermediate shaft 4 (second rotating shaft) that is supported, and a coupling 5 that connects the intermediate shaft 4 and the rotating shaft 11 of the dynamo 1 are provided. The torque meter 2, the intermediate bearing 3, the intermediate shaft 4, and the coupling 5, the rotating shaft 11 of the dynamo 1 and the rotating shaft M1 of the specimen M are connected in a concentric shaft shape so as to be integrally rotatable. In this embodiment, the dynamo 1 and the intermediate bearing 3 are fixed to a common base 6. A specimen bracket 7 for attaching the specimen M is also fixed to the base 6. The specimen M is covered with a specimen M cover M2 having a caster M21 that can roll on the floor surface F on which the base 6 is placed.

Here, the torque meter 2 has, for example, a strain generating portion (not shown) in which distortion occurs due to torsion caused by the rotation of the torque transmission shaft 21, and the strain of the strain gauge attached to the strain generating portion is represented by an electric quantity. And the transmission torque is measured. FIG. 1 shows a flange-type torque meter 2 in which a specimen flange portion 22 is provided at one end of the torque transmission shaft 21 and an intermediate shaft flange portion 23 is provided at the other end of the torque transmission shaft. Other types of torque meters can also be applied. When the specimen M is a motor, the dynamo 1 becomes a “pseudo load”, and a torque meter 2 measures characteristics such as transmission torque with respect to the rotational speed of the motor as the specimen M.

In the specimen test device X of the present embodiment, the rotating shaft M1 of the specimen M that is rotatably supported by the specimen bracket 7 is connected to one end side of the torque meter 2, and the other end of the torque meter 2 is connected. One end side of the intermediate shaft 4 is connected to the side. A thermal insulator A1 is interposed between one end side of the torque meter 2 and the rotational axis M1 of the specimen M, and between the other end side of the torque meter 2, the intermediate shaft 4 and the rotational axis M1 of the specimen M. Is provided with a thermal insulator A2. Specifically, the thermal insulator A1 is interposed between the specimen flange portion 22 of the torque meter 2 and the torque meter flange portion M11, and the intermediate shaft flange portion 23 and the intermediate shaft 4 of the torque meter 2 A thermal insulator A2 is interposed between the flange portion 41 provided on one end side. In FIG. 1, for convenience of explanation, each thermal insulator (thermal insulator A1, thermal insulator A2) is shown with a pattern. Each thermal insulator (thermal insulator A1, thermal insulator A2) may be formed from the same material, or may be formed from different materials. In the present embodiment, as each thermal insulator (thermal insulator A1, thermal insulator A2), for example, an annular one made of glass epoxy whose dimension (thickness) in the torque transmission direction is set to a predetermined value (for example, 10 mm) or more. Has been applied.

The intermediate bearing 3 includes a bearing main body 31 that rotatably supports the intermediate shaft 4, and a support base 32 that is fixed on the base 6 while supporting the bearing main body 31. The specimen test apparatus X of the present embodiment includes an oil cooling means B that oil-cools the entire intermediate bearing 3. In FIG. 1, an intermediate bearing cover B1 that covers the intermediate bearing 3 and has a lubricating oil path (not shown) in the oil cooling means B is schematically shown by a one-dot chain line. Then, by supplying lubricating oil from an appropriate lubricating oil storage tank into the lubricating oil path of the intermediate bearing cover B1, the temperature of the intermediate bearing 3 can be maintained at room temperature (for example, 23 degrees ± 5 degrees) or lower than room temperature. It is set to be possible. Here, in order to adjust the temperature of the intermediate bearing 3 to the normal temperature or a temperature lower than the normal temperature (low temperature), naturally, the normal temperature or low temperature lubricating oil is used. This contributes to lowering and, in turn, improving the damper function of the intermediate bearing 3. Therefore, in the specimen test apparatus X of the present embodiment, a situation where torque pulsation is transmitted between the rotating shaft 11 of the dynamo 1 and the rotating shaft M1 of the specimen M without using a complicated damper mechanism or the like. Can be prevented.

The coupling 5 includes a dynamo coupling flange 51 that can be connected to the rotary shaft 11 of the dynamo 1, a coupling shaft 52 that has one end connected to the dynamo coupling flange 51 so as to be integrally rotatable, and the other end of the coupling shaft 52. And a bearing coupling flange portion 53 provided so as to be integrally rotatable with the portion. The dynamo connecting flange portion 51 of the coupling 5 is fixed to the intermediate bearing side flange 12 formed at the end portion of the rotating shaft 11 of the dynamo 1, and the bearing connecting flange portion 53 is the end of the intermediate shaft 4 on the dynamo 1 side. It is fixed to the flange part 42 formed in the part. In this embodiment, since the coupling shaft 52 and each connecting flange portion (the dynamo connecting flange portion 51 and the bearing connecting flange portion 53) are made of metal, the strength is high, and both high torque and high speed rotation can be achieved. .

In such a specimen test apparatus X, when any one of the rotation axis M1 of the specimen M or the rotation axis 11 of the dynamo 1 rotates (for example, the rotation axis M1 of the specimen M), the torque is: The torque is transmitted to the other rotating shaft (for example, the rotating shaft 11 of the dynamo 1) through the torque meter 2, the intermediate bearing 3, and the coupling 5. Therefore, the specimen test apparatus X of the present embodiment can transmit power (torque) between the rotating shaft M1 of the specimen M and the rotating shaft 11 of the dynamo 1, and measure various characteristics of the specimen M. can do. In the following description, the “torque transmission direction” means a direction in which torque is transmitted between the rotating shaft M1 of the specimen M and the rotating shaft 11 of the dynamo 1, and the rotation of the rotating shaft M1 of the specimen M and the dynamo 1 is rotated. This coincides with the axial direction of the shaft 11.

The specimen test apparatus X of this embodiment includes a blower C that applies temperature-controlled air adjusted to a predetermined temperature range to the torque meter 2, a measuring unit that indirectly measures the temperature of the torque meter, And a temperature-controlled air control unit E that controls the temperature of the temperature-controlled air supplied from the blower C based on the measurement result. In the present embodiment, as the measurement unit, one having a supply temperature adjustment air measurement unit D that measures the temperature of the temperature adjustment air supplied from the blower C is applied, and the temperature adjustment air control unit E is a torque supply temperature adjustment air. Based on the result of the measurement unit D, the temperature of the temperature-controlled air supplied from the blower C is controlled.

The blower C has a temperature that is 5 to 2 degrees lower than a predetermined set value (for example, 23 degrees ± 5 degrees) corresponding to a temperature range in which the torque meter 2 (strain sensor of the torque meter 2) operates normally. The wind (temperature-controlled air) adjusted to this predetermined temperature range is blown to the torque meter 2. The specimen test apparatus X of the present embodiment includes a thermostatic chamber F that covers at least the torque meter 2, and is configured such that temperature-controlled air is blown from the blower C into the thermostatic chamber F. The blower C is disposed in a torque meter temperature control device E1 constituting the temperature control air control unit E, and the blower outlet C1 of the blower C communicates with the discharge port E2 of the torque meter temperature control device E1. Here, the temperature control air control unit E of the present embodiment adjusts the temperature of the temperature control air based on the measurement result of the supply temperature control air measurement unit D arranged in the vicinity of the discharge port E2 of the torque meter temperature control device E1. In addition to controlling, the amount of air sent from the blower C is also controlled. In addition, the supply temperature control air measurement part D can be comprised by a known temperature sensor etc.

In the present embodiment, as the thermostat F, a predetermined region including the entire torque meter 2, specifically, a position on the torque meter 2 side of the intermediate bearing 3 from a position continuous with the specimen bracket 7 described above in the torque transmission direction. A device that can surround a region up to a predetermined position (for example, a position corresponding to half of the intermediate bearing 3 on the torque meter 2 side) is applied (see FIG. 1). In the thermostat F, the thermostat measuring part G for measuring the temperature in the thermostat F is provided. This constant-temperature bath measurement unit G can be configured by a known temperature sensor or the like, similar to the supply temperature control air measurement unit D.

In addition, the specimen test apparatus X of the present embodiment discharges the temperature-controlled air blown to the torque meter 2 in the thermostat F into the temperature-control apparatus E1 through the suction port E3 of the temperature-control apparatus E1, and controls the temperature-controlled air control. The temperature adjustment device E1 constituting the part E is configured to be blown into the thermostatic chamber F through the blower C and the discharge port E2 as temperature adjustment air adjusted to a predetermined range of temperature.

Moreover, the specimen test apparatus X of the present embodiment includes a dryer H that supplies dry air into the thermostatic chamber F.

The known specimen testing apparatus in which the rotating shaft of the specimen is directly connected to one end of the torque meter and the intermediate shaft supported by the intermediate bearing is directly connected to the other end of the torque meter is used during the test. Since the heat of the specimen and the intermediate bearing is easily transmitted to the torque meter, it is necessary to correct the measured value of the torque meter in consideration of the temperature drift of the torque meter, but using the specimen test device X according to the present embodiment If a test is performed, the temperature of the torque meter 2 can be stabilized by blowing the temperature-controlled air controlled to a predetermined temperature by the temperature-controlled air control unit E from the blower C to the torque meter 2, and is affected by temperature drift. Therefore, highly accurate torque control can be performed. An appropriate test result relating to the specimen M can be obtained by the specimen test apparatus X of the present embodiment capable of performing various performance tests relating to the specimen M under such highly accurate torque control. In addition, such a specimen test apparatus X can be applied to a known specimen test apparatus relatively easily. For example, torque based on temperature drift characteristics or temperature-rated torque characteristics measured in advance. Compared with the configuration for correcting the detection signal of the meter, it is not necessary to prepare a map or table in which each characteristic is measured in advance, and processing for correcting the detection signal of the torque meter is not necessary.

Furthermore, since the specimen test apparatus X of the present embodiment includes a thermostatic chamber F that covers at least the torque meter 2, not only the torque meter 2 but also the temperature around the torque meter 2 is controlled from the blower C. The temperature according to the air can be maintained, and the temperature drift of the torque meter 2 due to the fluctuation of the ambient temperature of the torque meter 2 can be prevented and suppressed.

In particular, in the specimen test apparatus X according to the present embodiment, each of the specimen M side shaft M1 and the torque meter 2 directly connected to the torque meter 2 and between the intermediate shaft 4 and the torque meter 2 are respectively connected. Since the thermal insulators A1 and A2 are interposed, it is possible to effectively prevent / suppress the situation of heat transfer from the specimen M or the intermediate bearing 3 to the torque meter 2, and the temperature control air control unit E Combined with blowing the temperature-controlled air adjusted to a predetermined temperature from the blower C to the torque meter 2, it is possible to avoid the occurrence of temperature drift in the torque meter 2.

Moreover, since the specimen test apparatus X of the present embodiment includes the oil cooling means B for oil cooling the intermediate bearing 3 itself, the heat generation of the intermediate bearing 3 can be suppressed by the oil cooling means B, and the torque meter 2 It is possible to more effectively suppress the situation where heat is transferred from the intermediate bearing 3 side.

In addition, since the specimen test apparatus X of the present embodiment includes a dryer H that supplies dry air to the torque meter 2 in the thermostat F, it is possible to prevent condensation from occurring in the thermostat F. it can.

In addition, this invention is not limited to embodiment mentioned above. For example, the temperature-controlled air adjusted to a predetermined temperature range supplied by the blower may be dry air.

Moreover, it may be a specimen test device that does not include a thermostatic bath and is configured to blow temperature-controlled air (may be dry air) from a blower to a torque meter exposed to the outside.

In the above-described embodiment, as an example of a measuring unit that indirectly measures the temperature of the torque meter, a measuring unit having a supply temperature adjusting air measuring unit that measures the temperature of the temperature adjusting air supplied from the blower is described. Although the control unit that controls the temperature of the temperature-controlled air blown out from the blower based on the measurement result of the supply temperature-controlled air measuring unit is exemplified, the measuring means for indirectly measuring the temperature of the torque meter is the temperature in the thermostatic chamber. It can also be configured using only the measurement unit G (see FIG. 1) to be measured. In this case, a control part should just control the temperature of the temperature control air supplied from a blower based on the measurement result of the measurement part G in a thermostat. This is because the experimental results show that the temperature of the temperature-controlled air blown out from the blower is approximately proportional to the temperature in the thermostat, and the temperature in the thermostat and the temperature of the torque meter have a strong correlation. It is a technical idea based on In addition, when the measuring means has both the supply temperature control air measurement unit and the measurement unit in the thermostatic chamber, supply from the blower based on the measurement results of both the supply temperature control air measurement unit and the measurement unit in the thermostatic chamber You may employ | adopt the control part which controls the temperature of the temperature control air to perform.

The measuring means can also be configured using a torque meter temperature measuring unit that directly measures the temperature of the torque meter itself. In this case, the controller controls only the measurement result of the torque meter temperature measurement unit that directly measures the temperature of the torque meter itself, or in addition to the measurement result of the torque meter temperature measurement unit, the supply temperature adjustment air measurement unit Or you may control the temperature of the temperature control air supplied from a blower based on the measurement result of at least any one of the measurement part in a thermostat. Examples of the torque meter temperature measurement unit include a wireless type temperature sensor that can measure the temperature of a rotating torque meter in a non-contact manner.

Further, a mode in which a thermal insulator is interposed only between one of the shaft on the specimen side and the shaft on the intermediate bearing side, which are respectively connected to the torque meter, and the torque meter, or any shaft and the torque meter A mode in which no thermal insulator is interposed between the two may also be adopted.

Moreover, the aspect which is not provided with the oil cooling means which oil-cools intermediate bearing itself, and the aspect which is not provided with the dryer may be sufficient.

Further, a specimen other than a motor, such as an electric motor or a transmission, may be applied as the specimen, or a dynamo may function as a pseudo drive source instead of a pseudo load.

In addition, the specific configuration of each part is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Dynamo 11 ... Dynamo rotating shaft 2 ... Torque meter 3 ... Intermediate bearing A1, A2 ... Thermal insulator B ... Oil cooling means C ... Blower D ... Measuring means, supply temperature control air measurement part E ... Temperature control air control part F ... Constant temperature bath G ... Measurement unit H in constant temperature chamber ... Dryer M ... Specimen M1 ... Rotating axis X of specimen Specimen test device

Claims (3)

A dynamo that applies a test load to the specimen,
A torque meter provided between the specimen and the dynamo;
A thermostat covering the torque meter;
A first rotating shaft connected to the specimen side which is one end of the torque meter, and a second rotating shaft connected to the dynamo side which is the other end of the torque meter and supported by a bearing via the torque meter. Specimen testing device connected concentrically,
The specimen is an electric vehicle motor,
The thermostatic chamber is provided so as to surround the first rotating shaft and the second rotating shaft so as to suppress a temperature drift of the torque meter due to a change in ambient temperature of the torque meter, and in the thermostatic chamber. A test specimen testing apparatus comprising a blower for supplying temperature-controlled air. Measuring means for directly or indirectly measuring the temperature of the torque meter in the thermostat, and temperature-controlled air control for controlling the temperature of the temperature-controlled air supplied from the blower based on the measurement result of the measuring means The specimen test device according to claim 1, wherein the blower blows out the temperature-controlled air adjusted within a predetermined temperature range. The specimen test according to claim 1 or 2, wherein a thermal insulator is interposed between at least one of the first rotating shaft and the second rotating shaft connected to the torque meter and the torque meter. apparatus.

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