Rotation testing device

Abstract

To realize a rotation testing device that can more reliably suppress the transmission of electromagnetic waves in an axial direction between a dynamometer side rotary shaft and a test-piece side rotary shaft.SOLUTION: A rotation testing device 1 has a dynamometer 10, a dynamometer side rotary shaft D, a dynamometer side connection part 41, a test-piece side rotary shaft T, a test-piece side connection part 49, and an insulation member 50 that electrically insulates the dynamometer side connection part 41 and the test-piece side connection part 49. The rotation testing device further has: wall parts 79 and 179 that are positioned radially outward from a dynamometer side connection part 20 or a test-piece side connection part 30 between the dynamometer 10 and a test-piece 99 and have electrical conductivity; and conductive parts 75 and 175 that are positioned between the wall parts 79 and 179 and the dynamometer side connection part 41 or the test-piece side connection part 49 and electrically connect the wall parts 79 and 179 and the dynamometer side connection part 41 or the test-piece side connection part 49.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a rotation test apparatus for performing a rotation test on a test piece. [Background technology]

[0002] There are known techniques for preventing the propagation of electromagnetic waves between two rotating bodies. For example, Patent Document 1 discloses a power transmission device having an electromagnetic wave shielding wall that separates a first space in which a driver is disposed and a second space in which a driven body is disposed, a rotating shaft that transmits a rotational driving force by penetrating the electromagnetic wave shielding wall, and a bearing that supports the rotating shaft.

[0003] The rotating shaft includes a first shaft member journalled by the bearing. The bearing includes a rolling element, an inner ring constituent part and an outer ring constituent part. The first shaft member, the rolling elements, the inner ring constituent part and the outer ring constituent part of the rotating shaft are formed of a conductive material. The outer ring constituent part is fixed to the electromagnetic wave shielding wall. As a result, electromagnetic waves are transmitted from the first shaft member through the inner ring constituent part, the rolling elements and the outer ring constituent part to the electromagnetic wave shielding wall. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2010 / 055578 Summary of the Invention [Problem to be solved by the invention]

[0005] In the power transmission device of Patent Document 1, the shaft portion of the rotating shaft is supported by the bearing. Therefore, the electromagnetic waves are released to the electromagnetic wave shielding wall at the shaft portion via the bearing. However, since the shaft portion is conductive in the axial direction, there is a possibility that the electromagnetic waves are transmitted in the axial direction through the shaft portion.

[0006] However, there is a demand for improved test accuracy in rotation testing equipment, and a higher level of EMC (Electromagnetic Compatibility) measures are being sought. Specifically, there is a demand for more reliable suppression of electromagnetic waves in the axial direction between the rotating shaft on the dynamometer side, which is the rotation drive source, and the rotating shaft on the test piece side, which is the driven body.

[0007] An object of the present invention is to provide a rotation testing device that can more reliably suppress the axial transmission of electromagnetic waves between a dynamometer-side rotating shaft and a specimen-side rotating shaft. [Means for solving the problem]

[0008] A rotation testing apparatus according to one embodiment of the present invention comprises a dynamometer, a dynamometer side rotating shaft that outputs the rotation of the dynamometer, a dynamometer side connection portion that is rotatably attached to the end of the dynamometer side rotating shaft integrally with the dynamometer side rotating shaft, a specimen side rotating shaft that transmits the rotation of the dynamometer to a specimen, a specimen side connection portion that is rotatably attached to the end of the specimen side rotating shaft integrally with the specimen side rotating shaft and is connected to the dynamometer side connection portion integrally and rotatably, and an insulating member that is positioned between the dynamometer side connection portion and the specimen side connection portion and electrically insulates the dynamometer side connection portion from the specimen side connection portion. This rotation testing apparatus has a conductive wall portion located radially outward of the dynamometer side connection portion or the specimen side connection portion between the dynamometer and the specimen, and a conductive portion located between the wall portion and the dynamometer side connection portion or the specimen side connection portion, electrically connecting the wall portion to the dynamometer side connection portion or the specimen side connection portion (first configuration).

[0009] As a result, electromagnetic waves transmitted axially between the dynamometer side rotating shaft and the specimen side rotating shaft are suppressed by the insulating member located between the dynamometer side connection part and the specimen side connection part, and are dissipated from the dynamometer side connection part or the specimen side connection part to the wall part via the conductive part.

[0010] Therefore, the insulating member and the conductive portion can suppress the transmission of electromagnetic waves from the dynamometer side rotating shaft to the specimen side rotating shaft and vice versa.

[0011] Therefore, it is possible to provide a rotation testing device that can more reliably suppress the transmission of electromagnetic waves in the axial direction between the dynamometer side rotating shaft and the test piece side rotating shaft.

[0012] In the first configuration, the conductive portion includes a conductive fluid that is a conductive fluid. The conductive fluid is located between the wall portion and the dynamometer side connection portion or the specimen side connection portion, and electrically connects the wall portion to the dynamometer side connection portion or the specimen side connection portion (second configuration).

[0013] In the above-mentioned configuration, the conductive fluid comes into contact with the dynamometer side connection part or the specimen side connection part. Therefore, a gap is unlikely to occur between the wall part and the dynamometer side connection part or the specimen side connection part. Therefore, the electromagnetic waves propagating in the axial direction between the dynamometer side rotating shaft and the specimen side rotating shaft can be efficiently released by the wall part.

[0014] Furthermore, wear on the dynamometer side connection portion or the specimen side connection portion, which may occur when a metallic material such as a brush comes into contact with the dynamometer side connection portion or the specimen side connection portion, can be suppressed.

[0015] Therefore, it is possible to provide a rotation testing device that can more reliably suppress the axial transmission of electromagnetic waves between the dynamometer side rotating shaft and the specimen side rotating shaft.

[0016] In the first configuration, the wall portion is located radially outward of the specimen-side connection portion. The conductive portion is located between the wall portion and the specimen-side connection portion, and electrically connects the wall portion and the specimen-side connection portion (third configuration).

[0017] This allows electromagnetic waves transmitted from the dynamometer-side rotating shaft to the specimen-side rotating shaft to escape to the wall portion by the conductive portion, thereby more reliably suppressing electromagnetic waves from being transmitted in the axial direction from the dynamometer-side rotating shaft to the specimen-side rotating shaft.

[0018] In the first configuration, the rotation testing apparatus further includes an electromagnetic wave shielding wall located between the dynamometer and the specimen, the electromagnetic wave shielding wall suppressing the propagation of electromagnetic waves between a dynamometer side area in which the dynamometer is housed and a specimen side area in which the specimen is housed, the wall portion being connected to the electromagnetic wave shielding wall (fourth configuration).

[0019] This allows electromagnetic waves that are released from the dynamometer-side connection portion or the specimen-side connection portion to the wall portion to escape to the electromagnetic wave shielding wall. Moreover, the electromagnetic wave shielding wall can suppress the propagation of electromagnetic waves between the dynamometer-side region and the specimen-side region.

[0020] Therefore, the propagation of electromagnetic waves between the dynamometer and the test piece can be more reliably suppressed.

[0021] In the third configuration, the rotation test apparatus further includes a connecting member that axially penetrates and connects the dynamometer-side connecting portion and the specimen-side connecting portion with the insulating member sandwiched therebetween, and a conductive cover member attached to the specimen-side connecting portion on the axial side of the specimen-side connecting portion. The cover member is attached to the specimen-side connecting portion so as to cover at least a part of the portion of the connecting member that protrudes relative to the specimen-side connecting portion (fifth configuration).

[0022] This allows electromagnetic waves emitted from the end of the connecting member protruding from the specimen-side connection part to be transmitted to the specimen-side connection part via the conductive cover member and then released to the wall part. Therefore, it is possible to more reliably suppress the electromagnetic waves transmitted from the dynamometer-side rotating shaft to the specimen-side connection part and the electromagnetic waves transmitted from the specimen-side rotating shaft to the specimen-side connection part from being emitted toward the specimen. Effect of the Invention

[0023] A rotation testing apparatus according to one embodiment of the present invention comprises a dynamometer, a dynamometer side rotating shaft that outputs the rotation of the dynamometer, a dynamometer side connection portion that is rotatably attached to the end of the dynamometer side rotating shaft integrally with the dynamometer side rotating shaft, a specimen side rotating shaft that transmits the rotation of the dynamometer to a specimen, a specimen side connection portion that is rotatably attached to the end of the specimen side rotating shaft integrally with the specimen side rotating shaft and is connected to the dynamometer side connection portion integrally and rotatably, and an insulating member that is positioned between the dynamometer side connection portion and the specimen side connection portion and electrically insulates the dynamometer side connection portion from the specimen side connection portion. This rotation testing apparatus has a conductive wall portion located radially outward of the dynamometer side connection portion or the specimen side connection portion between the dynamometer and the specimen, and a conductive portion located between the wall portion and the dynamometer side connection portion or the specimen side connection portion, electrically connecting the wall portion to the dynamometer side connection portion or the specimen side connection portion.

[0024] As a result, the insulating member suppresses the electromagnetic waves from being transmitted in the axial direction between the dynamometer-side rotating shaft and the specimen-side rotating shaft, and the electromagnetic waves are guided to the wall by the conductive portion at the dynamometer-side connecting portion or the specimen-side connecting portion. Therefore, the insulating member and the conductive portion can more reliably suppress the electromagnetic waves from being transmitted in the axial direction between the dynamometer-side rotating shaft and the specimen-side rotating shaft. [Brief description of the drawings]

[0025] [Figure 1] FIG. 1 is a side view of a rotation test device according to one embodiment of the present invention. [Diagram 2] FIG. 2 is an enlarged view of the connection structure between the dynamometer side connection part and the specimen side connection part in the rotation test device shown in FIG. [Diagram 3] FIG. 3 is a cross-sectional view of the rotation test device shown in FIG. 1 taken along line III-III. [Figure 4] FIG. 4 is a diagram showing an example in which a magnetic fluid is used as the conductive fluid. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0026] Hereinafter, the embodiments of the present invention will be described in detail with reference to the drawings. The same or corresponding parts in the drawings are designated by the same reference numerals, and the description thereof will not be repeated. Note that the dimensions of the components in each drawing do not faithfully represent the actual dimensions of the components and the dimensional ratios of each component.

[0027] In the following description, the axial direction refers to the direction in which the axis P of the output shaft 11 of the dynamometer 10 extends. In the axial direction, the direction in which the dynamometer 10 is located relative to the test piece 99 is referred to as "one side." In the axial direction, the direction in which the test piece 99 is located relative to the dynamometer 10 is referred to as "the other side."

[0028] In addition, in the following description, the expressions "connect" and "attach" (hereinafter, "connect") include not only cases where members are directly connected to each other, but also cases where members are connected via other members. In other words, in the following description, the expressions "connect" include the meanings of direct and indirect connection between members.

[0029] (Overall composition) 1 is a side view of a rotation test device 1 according to one embodiment of the present invention. The rotation test device 1 is a device for performing a rotation test of a specimen 99. The specimen 99 is, for example, an engine, an EV motor, a transmission, etc. used in an automobile or the like. The specimen 99 has an input shaft 91.

[0030] 1, when a rotational force R is input to a test piece 99, the test piece 99 rotates about a rotation center line M. The rotation center line M coincides with an axis P of a rotating shaft system K described later.

[0031] The rotation testing device 1 includes a dynamometer 10, a rotating shaft portion 20, an intermediate bearing 28, an electromagnetic wave shielding wall 60, and an electromagnetic wave transmitting portion 70.

[0032] The dynamometer 10 is a rotational drive source in the rotation test device 1. The dynamometer 10 is, for example, a motor. The dynamometer 10 has an output shaft 11 that outputs a rotational force R. The configuration of the dynamometer 10 is similar to that of a conventional dynamometer, and therefore a detailed description thereof will be omitted.

[0033] The rotating shaft portion 20 has a first intermediate shaft 21, a second intermediate shaft 22, a third intermediate shaft 30, first couplings 26a, 26b, second couplings 26c, 26d, third couplings 41, 49, and fourth couplings 26e, 26f.

[0034] In this embodiment, the output shaft 11 of the dynamometer 10, the first intermediate shaft 21, the second intermediate shaft 22, the third intermediate shaft 30, and the input shaft 91 of the test specimen 99 are integrally rotatably connected to form a rotating shaft system K. In detail, the output shaft 11 and the first intermediate shaft 21 are connected by the first couplings 26a and 26b. The first intermediate shaft 21 and the second intermediate shaft 22 are connected by the second couplings 26c and 26d. The second intermediate shaft 22 and the third intermediate shaft 30 are connected by the third couplings 41 and 49. The third intermediate shaft 30 and the input shaft 91 of the test specimen 99 are connected by the fourth couplings 26e and 26f. The second intermediate shaft 22 is rotatably supported by the intermediate bearing 28. The intermediate bearing 28 may rotatably support the first intermediate shaft 21 or the third intermediate shaft 30.

[0035] The rotating shaft system K extends along an axis P. The output shaft 11, the first intermediate shaft 21, the second intermediate shaft 22, the third intermediate shaft 30, and the input shaft 91 are shafts made of metal such as steel.

[0036] The first couplings 26a and 26b, the second couplings 26c and 26d, the third couplings 41 and 49, and the fourth couplings 26e and 26f are members that connect the shafts together in the axial direction. The couplings are connected and fixed together, for example, by a plurality of bolts that pass through them in the axial direction.

[0037] By the rotating shaft system K having the above-mentioned configuration, the rotational force R outputted to the output shaft 11 of the dynamometer 10 can be transmitted in the axial direction from the dynamometer side to the test piece side.

[0038] Here, the output shaft 11, the first intermediate shaft 21, the second intermediate shaft 22, the first couplings 26a, 26b, and the second couplings 26c, 26d constitute a dynamometer-side rotating shaft D. The input shaft 91, the third intermediate shaft 30, and the fourth couplings 26e, 26f constitute a specimen-side rotating shaft T. Hereinafter, the third coupling 41 will be referred to as a dynamometer-side connecting portion. Also, the third coupling 49 will be referred to as a specimen-side connecting portion.

[0039] The electromagnetic wave shielding wall 60 constitutes a part of the anechoic chamber that covers the specimen 99. The dynamometer 10 is arranged outside the anechoic chamber. The space inside the anechoic chamber is the specimen side area S2, and the space outside the anechoic chamber is the dynamometer side area S1. Thus, the electromagnetic wave shielding wall 60 separates the dynamometer side area S1 in which the dynamometer 10 is housed from the specimen side area S2 in which the specimen 99 is housed.

[0040] The electromagnetic wave shielding wall 60 suppresses the propagation of electromagnetic waves between the dynamometer side area S1 and the specimen side area S2. The electromagnetic wave shielding wall 60 has a shielding material such as a steel plate that suppresses the propagation of electromagnetic waves. The electromagnetic wave shielding wall 60 may be grounded. This allows the electromagnetic wave shielding wall 60 to allow the electromagnetic waves and the like that are transmitted to the electromagnetic wave shielding wall 60 to escape.

[0041] An absorber 65 is provided on the inner surface of the electromagnetic shielding wall 60, i.e., on the portion of the electromagnetic shielding wall 60 facing the specimen side region S2. The electromagnetic waves in the anechoic chamber are absorbed without being reflected by the absorber 65. The configuration of the anechoic chamber having the absorber 65 is similar to a known configuration, and therefore a detailed description thereof will be omitted.

[0042] The electromagnetic wave shielding wall 60 has a through hole 61. The through hole 61 penetrates the electromagnetic wave shielding wall 60 in the axial direction on the axis P. A dynamometer side connection part 41 and a specimen side connection part 49, which will be described later, are connected inside the through hole 61. An electromagnetic wave transmission part 70, which will be described later, is arranged inside the through hole 61.

[0043] (Connection structure between dynamometer side connection part and test piece side connection part) Fig. 2 is an enlarged view showing a connection structure between the dynamometer side connection part 41 and the specimen side connection part 49 in the rotation test device 1 shown in Fig. 1. Fig. 3 is a cross-sectional view taken along line III-III shown in Fig. 1.

[0044] 1 to 3, the dynamometer side connection part 41 is provided to be integrally rotatable on the other end part 22b of the second intermediate shaft part 22. The specimen side connection part 49 is provided to be integrally rotatable on one end part 30a of the specimen side rotating shaft T. The dynamometer side connection part 41 and the specimen side connection part 49 are, for example, flange-shaped members.

[0045] The dynamometer side connection part 41 and the test piece side connection part 49 are made of a conductive metal material.

[0046] The dynamometer side connection part 41 and the test piece side connection part 49 are connected by a connecting member 45 with an insulating member 50 sandwiched in the axial direction.

[0047] The insulating member 50 is a disk-shaped member made of an insulating material such as ceramic, resin, glass epoxy, etc. Therefore, the insulating member 50 electrically insulates the dynamometer side connection part 41 and the specimen side connection part 49.

[0048] The connecting member 45 includes a bolt 47 and a nut 46. The bolt 47 is, for example, inserted from the specimen side, and the nut 46 is fastened to the dynamometer side of the shaft portion. This connects the second intermediate shaft 22 provided with the dynamometer side connection portion 41 and the third intermediate shaft 30 provided with the specimen side connection portion 49 so as to be rotatable together.

[0049] The dynamometer side of the dynamometer side connection portion 41 is covered by a dynamometer side cover member 81. The specimen side of the specimen side connection portion 49 is covered by a specimen side cover member 89. The dynamometer side cover member 81 and the specimen side cover member 89 are each made of a conductive material such as aluminum, and are anodized to prevent metal corrosion.

[0050] The bolt 47 has a nut 46 fastened to the tip 47a of the shaft while passing through the dynamometer side connection part 41, the insulating member 50, the specimen side connection part 49, the dynamometer side cover member 81 and the specimen side cover member 89. This allows the dynamometer side connection part 41, the insulating member 50, the specimen side connection part 49, the dynamometer side cover member 81 and the specimen side cover member 89 to be integrated together. The shaft of the bolt 47 is covered with an insulating material. The head 47b of the bolt 47 protrudes toward the specimen side relative to the specimen side connection part 49. The tip 47a of the shaft of the bolt 47 to which the nut 46 is fastened protrudes toward the specimen side relative to the dynamometer side connection part 41.

[0051] The dynamometer side cover member 81 (cover member) has a recess H81 in which the nut 46 and the tip 47a of the shaft portion of the bolt 47 protruding from the nut 46 are accommodated. This allows the nut 46 and the tip 47a of the shaft portion of the bolt 47 to be accommodated within the recess H81. The dynamometer side cover member 81 covers the nut 46 and the tip 47a of the shaft portion of the bolt 47 protruding from the dynamometer side connection part 41 so as not to be exposed in the radial direction. In other words, the dynamometer side cover member 81 is attached to the dynamometer side connection part 41 so as to cover at least a part of the portion protruding from the dynamometer side connection part 41.

[0052] The specimen-side cover member 89 (cover member) has a recess H89 in which the head 47b of the bolt 47 is accommodated. This allows the head 47b of the bolt 47 to be accommodated in the recess H89. The specimen-side cover member 89 covers the head 47b of the bolt 47 protruding from the specimen-side connection part 49 so as not to expose it in the radial direction. In other words, the specimen-side cover member 89 is attached to the specimen-side connection part 49 so as to cover at least a part of the portion protruding from the specimen-side connection part 49.

[0053] A molded portion G is formed in the recesses H81 and H89 from an insulating resin material. The molded portion G is made of, for example, epoxy resin, UV-curable adhesive, or the like. The resin material constituting the molded portion G is, for example, filled into the recesses H81 and H89 and cured. Thus, the molded portion G covers the head 47b of the bolt 47 and the nut 46 so as not to expose them in the axial direction. As a result, the head 47b of the bolt 47 and the nut 46 are not exposed in the axial direction.

[0054] (Electromagnetic wave transmission part) The electromagnetic wave transmitting section 70 is disposed between the specimen side connecting section 49 and the electromagnetic wave shielding wall 60. The electromagnetic wave transmitting section 70 has a conductive wall 79 (wall section) and a conductive fluid 75 (conductive section).

[0055] The conductive wall 79 is a metal plate member having electrical conductivity. The conductive wall 79 is located radially outward from the specimen-side connection portion 49. The conductive wall 79 is disposed so as to extend between the specimen-side connection portion 49 and the electromagnetic shielding wall 60. The conductive wall 79 is fixed to the electromagnetic shielding wall 60. More specifically, the conductive wall 79 is connected to a shielding material, such as a steel plate, of the electromagnetic shielding wall 60. As a result, the conductive wall 79 and the electromagnetic shielding wall 60 are electrically connected to each other.

[0056] The conductive fluid 75 is a fluid having electrical conductivity. The conductive fluid 75 is, for example, a magnetic fluid, a carbon paint, a metal ion type conductive gel, etc. The conductive fluid 75 may be any fluid other than these as long as it is a fluid having electrical conductivity.

[0057] The conductive fluid 75 is located between the conductive wall 79 and the specimen-side connection portion 49, and electrically connects the conductive wall 79 and the specimen-side connection portion 49. As a result, the electromagnetic wave shielding wall 60 and the specimen-side connection portion 49 are electrically connected via the conductive fluid 75 and the conductive wall 79.

[0058] With the above-described configuration, the conductive fluid 75 comes into contact with the rotating specimen-side connection part 49. Therefore, a gap is unlikely to occur between the conductive wall 79 and the specimen-side connection part 49. Therefore, the electromagnetic waves propagating in the axial direction between the second intermediate shaft 22 and the third intermediate shaft 30 can be more efficiently released to the conductive wall 79.

[0059] Moreover, wear on the specimen-side connecting portion 49, which may occur when a metallic material such as a brush comes into contact with the specimen-side connecting portion 49, can be suppressed.

[0060] 4 is a diagram showing an example in which a magnetic fluid 175 is used as the conductive fluid 75. This example will be described below.

[0061] 4, the electromagnetic wave transmission unit 70 has a pair of metal walls 179, a magnet 77, and a magnetic fluid 175. Here, the pair of metal walls 179 correspond to the wall portion, and the magnetic fluid 175 corresponds to the conductive portion.

[0062] The pair of metal walls 179 are electrically conductive metal plates. The pair of metal walls 179 are arranged in the axial direction at a predetermined interval. The magnet 77 is flat and sandwiched between the pair of metal walls 179.

[0063] The pair of metal walls 179 and the magnet 77 are located radially outward from the specimen-side connection portion 49. The pair of metal walls 179 and the magnet 77 are arranged to extend between the specimen-side connection portion 49 and the electromagnetic wave shielding wall 60. One end of the pair of metal walls 179 and the magnet 77 on the electromagnetic wave shielding wall 60 side is fixed to the electromagnetic wave shielding wall 60. As a result, the pair of metal walls 179 and the electromagnetic wave shielding wall 60 are electrically connected to each other.

[0064] The magnet 77 has different polarities on one side and the other side in the axial direction. Therefore, the metal wall 179 located on one side in the axial direction relative to the magnet 77 has different polarities in the axial direction from the metal wall 179 located on the other side. As a result, magnetic field lines S are formed between the pair of metal walls 179 and the specimen-side connection part 49.

[0065] The magnetic fluid 175 is a magnetic colloidal solution that is magnetic. Since a known magnetic fluid can be used as the magnetic fluid 175, a detailed description thereof will be omitted.

[0066] The magnetic fluid 175 is positioned between the pair of metal walls 179 and the specimen-side connection portion 49 so as to follow the magnetic field lines S formed between the pair of metal walls 179 and the specimen-side connection portion 49 by the magnet 77. This brings the magnetic fluid 175 into contact with the pair of metal walls 179 and the specimen-side connection portion 49. Thus, the magnetic fluid 175 electrically connects the pair of metal walls 179 and the specimen-side connection portion 49. Therefore, the electromagnetic wave shielding wall 60 and the specimen-side connection portion 49 are electrically connected via the magnetic fluid 175 and the pair of metal walls 179.

[0067] According to the above-mentioned configuration, the insulating member 50 is located between the dynamometer-side connecting portion 41 connected to the other end 22b of the second intermediate shaft 22 and the specimen-side connecting portion 49 connected to one end 30a of the third intermediate shaft 30. This makes it possible to suppress the transmission of electromagnetic waves in the axial direction between the second intermediate shaft 22 and the third intermediate shaft 30. In other words, it is possible to suppress the transmission of electromagnetic waves in the axial direction between the dynamometer-side rotating shaft D and the specimen-side rotating shaft T.

[0068] Moreover, the specimen side connection part 49 and the conductive wall 79 are electrically connected by the conductive fluid 75. As a result, the electromagnetic waves are guided by the conductive fluid 75 to the conductive wall 79 at the specimen side connection part 49.

[0069] Therefore, the propagation of the electromagnetic waves can be suppressed by the insulating member 50 and the conductive fluid 75. Therefore, the electromagnetic waves can be more reliably suppressed from being transmitted in the axial direction between the second intermediate shaft 22 and the third intermediate shaft 30.

[0070] Moreover, the conductive fluid 75 allows the electromagnetic waves to escape to the conductive wall 79 at the specimen side connection portion 49. This makes it possible to more reliably suppress the transmission of the electromagnetic waves from the second intermediate shaft 22 to the third intermediate shaft 30.

[0071] Moreover, the electromagnetic waves that have escaped to the conductive wall 79 or the pair of metal walls 179 are allowed to escape to the electromagnetic wave shielding wall 60. This allows the electromagnetic waves to escape efficiently by the electromagnetic wave shielding wall 60. Moreover, the electromagnetic wave shielding wall 60 can also suppress the propagation of electromagnetic waves between the dynamometer side area S1 and the specimen side area S2.

[0072] Therefore, electromagnetic waves propagating in the axial direction between the second intermediate shaft 22 and the third intermediate shaft 30 can be more efficiently dissipated, while the propagation of electromagnetic waves through the space between the dynamometer side area S1 and the specimen side area S2 can also be suppressed.

[0073] In addition, a specimen-side cover member 89 is disposed on the specimen side of the specimen-side connection part 49. This allows the specimen-side cover member 89 to transmit electromagnetic waves emitted from the specimen-side end part of the coupling member 45 to the specimen-side connection part 49 via the conductive specimen-side cover member 89, and to escape to the conductive wall 79 or the pair of metal walls 179.

[0074] Therefore, the electromagnetic waves propagating from the second intermediate shaft 22 to the specimen side connecting portion 49 and the electromagnetic waves propagating from the third intermediate shaft 30 to the specimen side connecting portion 49 can be prevented from being emitted toward the specimen 99.

[0075] Furthermore, the dynamometer side cover member 81 can suppress the emission of electromagnetic waves from the nut 46 of the connecting member 45 and the tip 47a of the shaft portion of the bolt 47.

[0076] (Other embodiments) Although the embodiment of the present invention has been described above, the above-mentioned embodiment is merely an example for carrying out the present invention. Therefore, the present invention is not limited to the above-mentioned embodiment, and it is possible to carry out the above-mentioned embodiment by appropriately modifying it within the scope of the gist of the present invention.

[0077] In the above embodiment, the conductive fluid 75 is located between the conductive wall 79 and the specimen-side connection portion 49, and electrically connects the conductive wall 79 and the specimen-side connection portion 49. However, the conductive fluid may be located between the conductive wall and the dynamometer-side connection portion, and electrically connects the conductive wall and the dynamometer-side connection portion.

[0078] As a result, the electromagnetic waves are guided to the conductive wall by the conductive fluid at the dynamometer-side connection portion, and the electromagnetic waves can be more reliably prevented from being transmitted in the axial direction from the third intermediate shaft to the second intermediate shaft by the insulating portion and the conductive fluid.

[0079] In the embodiment, the electromagnetic wave transmission unit 70 has a conductive wall 79 and a conductive fluid 75 (conductive portion). The conductive wall 79 is a metal plate having electrical conductivity. However, the conductive wall may have any configuration as long as it is located radially outward of the dynamometer side connection portion or the specimen side connection portion between the dynamometer and the specimen and has electrical conductivity. The conductive wall may be a part of the electromagnetic shield wall. The conductive portion may not be a conductive fluid, but may be, for example, a metallic brush having electrical conductivity.

[0080] In the above embodiment, the rotation test device 1 has a rotating shaft portion 20 and an intermediate bearing 28. In the rotating shaft portion 20, the third couplings 41, 49 correspond to the dynamometer side connection portion 41 and the specimen side connection portion 49. However, the rotation test device does not have to have a rotating shaft portion and an intermediate bearing. In that case, the rotation test device only needs to have a dynamometer side connection portion provided at the other end of the output shaft of the dynamometer and a specimen side connection portion provided at one end of the input shaft of the specimen. It may have only a part of the configuration of the rotating shaft portion 20.

[0081] In the embodiment described above, the cover member 80 is made of aluminum that has been anodized. However, the cover member does not have to be anodized.

[0082] In the above embodiment, the cover members 81, 89 cover a portion of the connecting member 45 protruding toward the dynamometer side connection portion 41 and the specimen side connection portion 49 so as not to expose the portion in the radial direction. However, the cover member may cover the connecting member protruding toward the dynamometer side connection portion and the specimen side connection portion in the axial direction. The cover member may cover the entire connecting member protruding toward the dynamometer side connection portion and the specimen side connection portion. Note that the cover member may be provided on only one of the dynamometer side connection portion or the specimen side connection portion, and does not have to be provided on both the dynamometer side connection portion and the specimen side connection portion.

[0083] In the embodiment, the connecting member 45 includes a bolt 47 and a nut 46. However, the connecting member is not limited to these configurations, and may have any configuration as long as it is capable of axially connecting the dynamometer side connection part and the specimen side connection part by sandwiching the insulating part.

[0084] In the above embodiment, the electromagnetic shielding wall 60 constitutes a part of the anechoic chamber that covers the specimen 99. However, the electromagnetic shielding wall does not have to be a part of the anechoic chamber as long as it is disposed between the dynamometer and the specimen and is a conductive wall. The electromagnetic shielding wall does not have to include an absorber.

[0085] Furthermore, the rotation testing device may not include an electromagnetic wave shielding wall, and the conductive wall may be directly grounded.

[0086] In the above embodiment, the specimen 99 is, for example, an engine used in an automobile, an EV motor, a transmission, etc. However, the specimen may be anything as long as it has a rotating structure. [Industrial Applicability]

[0087] INDUSTRIAL APPLICABILITY The present invention can be used in a rotation testing apparatus in which a dynamometer-side rotating shaft and a specimen-side rotating shaft are connected by a coupling so as to be rotatable together. [Explanation of symbols]

[0088] 1 Rotational test equipment 10 Dynamometer 11 Output shaft 20 Rotating shaft 21 First intermediate shaft 22 Second intermediate shaft 26a, 26b First coupling 26c, 26d Second coupling 26e, 26f 4th coupling 28 Bearings 30 3rd intermediate shaft 30a One end of the third intermediate shaft 41 Dynamometer side connection part (third coupling) 45 Connecting member 46 Nut 47 Volts 47a Shaft end (bolt) 47b Head (Bolt) 49 Test specimen side connection part (third coupling) 50 Insulating material 60 Electromagnetic Shielding Wall 61 Through hole 65 Absorber 70 Electromagnetic Wave Transmission Section 75 Conductive fluid (conductive part) 175 Magnetic fluid (conductive part) 77 Magnet 79 Conductive wall (wall section) 179 Pair of metal walls (walls) 80 Cover member 81 Dynamometer side cover member 89 Cover member on specimen side 91 Input shaft 99 Specimen K Rotational axis system P axis D Dynamometer side rotating shaft T Test piece side rotation axis M Rotation center line (test specimen) S1 Dynamometer side area S2 Specimen side area H81 Recess (Dynamometer side cover part) H89 Concave section (specimen side cover member) G mold part S Magnetic field lines

Claims

1. A dynamometer; a dynamometer-side rotating shaft that outputs the rotation of the dynamometer; a dynamometer side connection portion provided at an end of the dynamometer side rotating shaft so as to be rotatable integrally with the dynamometer side rotating shaft; A specimen-side rotating shaft that transmits the rotation of the dynamometer to a specimen; a specimen-side connection portion provided at an end of the specimen-side rotating shaft so as to be rotatable integrally with the specimen-side rotating shaft and connected to the dynamometer-side connection portion so as to be rotatable integrally with the specimen-side rotating shaft; an insulating member located between the dynamometer side connection portion and the specimen side connection portion, electrically insulating the dynamometer side connection portion and the specimen side connection portion; A rotation test apparatus having a wall portion located radially outward of the dynamometer side connection portion or the test piece side connection portion between the dynamometer and the test piece, the wall portion having electrical conductivity; a conductive portion located between the wall portion and the dynamometer side connection portion or the specimen side connection portion, electrically connecting the wall portion and the dynamometer side connection portion or the specimen side connection portion; having Rotational test equipment.

2. 2. The rotation test apparatus of claim 1, The conductive portion includes a conductive fluid that is a conductive fluid, The conductive fluid is located between the wall portion and the dynamometer side connection portion or the specimen side connection portion, and electrically connects the wall portion and the dynamometer side connection portion or the specimen side connection portion. Rotational test equipment.

3. 2. The rotation test apparatus of claim 1, The wall portion is located radially outward of the specimen-side connection portion, The conductive portion is located between the wall portion and the specimen-side connection portion and electrically connects the wall portion and the specimen-side connection portion. Rotational test equipment.

4. 2. The rotation test apparatus of claim 1, The present invention further includes an electromagnetic wave shield wall located between the dynamometer and the specimen, the electromagnetic wave shield wall suppressing the propagation of electromagnetic waves between a dynamometer side area in which the dynamometer is housed and a specimen side area in which the specimen is housed, The wall portion is connected to the electromagnetic wave shielding wall. Rotational test equipment.

5. 4. The rotation test apparatus according to claim 3, a connecting member that connects the dynamometer side connecting portion and the specimen side connecting portion by penetrating the insulating member in the axial direction; A conductive cover member attached to the specimen side in the axial direction relative to the specimen side connection portion; and The cover member is The connecting member is attached to the specimen side connecting portion so as to cover at least a part of the portion of the connecting member that protrudes relative to the specimen side connecting portion. Rotational test equipment.

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