Chassis dynamometer

Abstract

The present disclosure aims to provide a structure of a chassis dynamometer that reduces the installation space. The roller (2) in the roller device (100) provided in the chassis dynamometer of the present disclosure includes a motor (2) provided in a roller outer frame body (10). In the motor (2), a rotating shaft (21) is attached to the roller outer frame body (10) so as to be rotatable in conjunction with the rotational movement of the motor rotor (71), and a swinging shaft (21) is attached to a stator structure (72) without being linked to the rotational movement of the motor rotor (71). The rotating shaft (21) is supported by a rotating bearing stand (11), and the swinging shaft (22) is supported by a swinging bearing stand (12). A cooling fan (50) that supplies cooling air (F2) to the motor (7) is provided outside the roller (2).

Description

[Technical field]

[0001] The present disclosure relates to a chassis dynamometer used for various running tests of vehicles. [Background technology]

[0002] Chassis dynamometers have been used in the past when conducting running tests of vehicles (automobiles), and include a roller device as a main component. The chassis dynamometer also has a vehicle fixing mechanism that fixes the vehicle placed on the roller device when conducting a running test. For example, a chassis dynamometer disclosed in Patent Document 1 is an example of a conventional chassis dynamometer.

[0003] To carry out various driving tests involving vehicle steering operations, it is necessary to perform a roller turning operation to turn the rollers to match the turning operation of the tires. In other words, the roller turning operation is necessary to realize a control method for making the roller devices for the left and right tires follow the turning angle of the tires caused by steering operations. The above control method can be applied to autonomous driving and ADAS simulated driving tests. "ADAS (Advanced Driver Assistance System)" means "advanced driving system" and is a system that detects the possibility of accidents and other events in advance and avoids them.

[0004] An example of a chassis dynamometer having a roller turning function is a chassis dynamometer included in a vehicle testing device disclosed in Patent Document 2.

[0005] (Roller device 200) Fig. 8 is a front view showing a schematic structure of a roller device 200 used in a conventional chassis dynamometer with a roller turning function as typified by Patent Document 2. Fig. 8 shows a front view seen from the front (+Y direction). Fig. 8 shows an XYZ orthogonal coordinate system. When the two tires 6 (6R, 6L) on the front wheel side of a vehicle 60 perform a tire turning operation due to a steering operation, the roller devices 200 shown in Fig. 8 are used as at least the two roller devices on the front wheel side.

[0006] The roller device 200 has a roller device 200R for the front right tire 6R and a roller device 200L for the front left tire 6L. Below, the roller device 200L will be described as a representative of the roller devices 200R and 200L.

[0007] As shown in the figure, the roller device 200L includes a roller turning mechanism 300L and a roller driving mechanism 80L as main components.

[0008] The roller turning mechanism 300L includes as its main components a fixed base 36, a turning motor 42, and a turning bearing 38. The turning bearing 38 is provided on the fixed base 36, and the turning motor 42 is attached adjacent to the side surface of the fixed base 36.

[0009] The swivel motor 42 is a geared motor whose speed can be controlled. A gear 42g is attached to the tip of the swivel motor 42, and the gear 42g meshes with a gear attached to the outer periphery of the swivel base 35. Therefore, the swivel base 35 can be rotated by the rotation of the swivel motor 42.

[0010] The swivel bearing 38 rotatably supports the swivel base 35, and the swivel base 35 is rotated around the center of the swivel bearing 38 by the power of the swivel motor 42. In this manner, the roller swivel mechanism 300L has the swivel base 35 that is rotated by the swivel motor 42.

[0011] The roller driving mechanism 80L above the roller turning mechanism 300L turns in conjunction with the turning of the turning base 35 in the roller turning mechanism 300L. Therefore, the roller turning mechanism 300L can perform a roller turning operation for turning the roller pair 20.

[0012] Next, the roller drive mechanism 80L will be described. The roller drive mechanism 80L having the roller pair 20 is provided on the rotating base .

[0013] The roller drive mechanism 80L for the twin roller configuration includes as its main components a roller drive motor 48, an encoder 49, a coupling 43, a reducer 5 formed of a gear box etc., a pair of rollers 20, and a rotating shaft 41. Here, the rotating shaft 41 forms a pair of rotating shafts 41 corresponding to the pair of rollers 20.

[0014] The roller drive motor 48 and the reducer 5 are fixed on the swivel base 35, and the roller drive motor 48, which serves as a drive source, drives and rotates each of the pair of rotating shafts 41 via the coupling 43 and the reducer 5. Specifically, the rotational motion transmission function is branched into two within the reducer 5, enabling the pair of rotating shafts 41 to be driven and rotated. In addition, the rotational speed of each of the roller pairs 20 based on the rotational speed of the roller drive motor 48 is measured by an encoder 49. The measurement result of the encoder 49 is also used as a feedback signal for controlling the roller drive motor 48.

[0015] Although not shown in Figure 8, a pair of roller bearing pedestals are provided on the swivel base 35 so as to straddle the roller drive motor 48, and the pair of rotating shafts 41 support the roller pair 20 rotatably between the reducer 5 and the pair of roller bearing pedestals.

[0016] A pair of rotation shafts 41 are attached so as to penetrate the center of each roller pair 20, so that the roller pair 20 can perform a rotational motion together with the rotation of the pair of rotation shafts 41.

[0017] Therefore, the roller driving mechanism 80L can perform a roller driving operation for driving to rotate the front roller 20F, which is a first roller, and a roller driving operation for driving to rotate the rear roller 20B, which is a second roller.

[0018] Incidentally, two roller drive mechanisms 80L compatible with a single roller configuration may be provided on the swivel base 35 to form a twin roller configuration.

[0019] The roller device 200R is the same as the roller device 200L. Niro The roller turning mechanism 300R includes a roller turning mechanism 300R and a roller driving mechanism 80R as main components. The configuration and operation of each part of the roller turning mechanism 300R are similar to those of the roller turning mechanism 300L, and the configuration and operation of each part of the roller driving mechanism 80R are similar to those of the roller driving mechanism 80L.

[0020] Hereinafter, when the roller device 200L and the roller device 200R are collectively referred to, they may be simply referred to as "roller device 200", and when the roller pair 20L and the roller pair 20R are collectively referred to, they may be simply referred to as "roller pair 20".

[0021] Furthermore, when roller drive mechanism 80L and roller drive mechanism 80R are collectively referred to simply as "roller drive mechanism 80", and when roller turning mechanism 300L and roller turning mechanism 300R are collectively referred to simply as "roller turning mechanism 300".

[0022] 9 and 10 are explanatory diagrams each showing a schematic diagram of a torque measuring mechanism in the roller driving mechanism 80R. Each of Fig. 9 and Fig. 10 shows an XYZ orthogonal coordinate system.

[0023] As shown in these figures, a roller drive motor 48 is supported on the swivel base 35 via a rocking bearing 47 and an oil film 46. As shown in Fig. 9, two combinations of rocking bearing 47 and oil film 46 are provided for the roller drive motor 48.

[0024] The roller drive motor 48 is supported in a floating state above the swivel base 35 via the oil film 46, which has the advantage that loss in the rotation direction of the roller drive motor 48 is small.

[0025] A load cell 45 is attached to the side of roller drive motor 48 via torque arm 44. When a reaction force is generated in the rotational direction of roller drive motor 48 during a running test of vehicle 60, the reaction force of roller drive motor 48 can be measured by load cell 45 because roller drive motor 48 is supported in a free state in the rotational direction.

[0026] Of course, the roller drive mechanism 80L also has a torque measuring mechanism similar to that of the roller drive mechanism 80R. [Prior art documents] [Patent documents]

[0027] [Patent Document 1] Japanese Patent Application Publication No. 53-1579 [Patent Document 2] JP 2023-89808 A Summary of the Invention [Problem to be solved by the invention]

[0028] 8 to 10 required a roller drive mechanism 80 to rotate the roller pair 20. The roller drive mechanism 80 requires components such as the roller drive motor 48 and the reducer 5 that are relatively large in size.

[0029] The roller device 200 is usually installed in an area called an underground pit below the floor surface on which the vehicle 60 is placed, but because the roller device 200 is large in size, it was necessary to take measures such as making the underground pit deep and to secure a relatively large installation space for the roller device 200.

[0030] For example, in the conventional chassis dynamometer shown in Fig. 8, it was necessary to provide a roller drive mechanism 80R for the tire 6R and a roller drive mechanism 80L for the tire 6L, so that it was necessary to increase the size in the height direction (Z direction) to compensate for the limitation in the size in the width direction (X direction). Therefore, it was necessary to increase the size in the height direction of the reducer 5, which is the power transmission mechanism, by reducing the size in the width direction.

[0031] As described above, the conventional chassis dynamometer has a problem in that the roller device 200 is large in size, and therefore requires too much installation space.

[0032] An object of the present disclosure is to provide a chassis dynamometer structure that solves the above-mentioned problems and reduces the installation space. [Means for solving the problem]

[0033] The chassis dynamometer of the present disclosure is a chassis dynamometer equipped with a roller device, the roller device comprising a roller on which a vehicle tire is placed and a cooler provided outside the roller, the roller including a roller outer frame and a motor provided within the roller outer frame, the motor including a motor rotor, a stator structure arranged to surround the motor rotor, a rotating shaft connected to the motor rotor, and a swinging shaft connected to the stator structure, the rotating shaft and the swinging shaft being spaced apart from each other relative to the roller. and the roller device further includes a rotating bearing base that rotatably supports the rotating shaft and a oscillating bearing base that oscillates and supports the oscillating shaft, the rotating shaft rotates in conjunction with the rotational movement of the motor rotor, the oscillating shaft is not linked to the rotational movement of the motor rotor, the rotating shaft is rotatably attached to the roller outer frame body, the roller outer frame body has a roller opening, and the cooler supplies cooling air to the motor through the roller opening of the roller outer frame body. Effect of the Invention

[0034] The roller of the roller device in the chassis dynamometer of the present disclosure has a motor inside the roller outer frame, so that the roller outer frame can be directly rotated by the rotating shaft of the motor.

[0035] Therefore, compared to conventional configurations in which an external motor for driving the roller to rotate is provided outside the roller, the chassis dynamometer disclosed herein can reduce the size of the device by eliminating the need to provide an external motor for driving the roller to rotate and a power transmission mechanism to the roller.

[0036] Furthermore, since the roller device in the chassis dynamometer disclosed herein is equipped with a cooler provided outside the roller, the motor inside the roller outer frame can be effectively cooled by supplying cooling air to the motor through a roller opening provided in the roller outer frame.

[0037] The objects, features, aspects, and advantages of the present disclosure will become more apparent from the following detailed description and the accompanying drawings. [Brief description of the drawings]

[0038] [Figure 1] 1 is an explanatory diagram showing a schematic structure of a roller device used in a chassis dynamometer according to an embodiment of the present invention; [Diagram 2] 2 is an explanatory diagram showing the roller drive mechanism shown in FIG. 1 as viewed from the side. [Diagram 3] FIG. 4 is an explanatory diagram showing details of a roller driving mechanism. [Figure 4] FIG. 4 is an explanatory diagram showing the principle of torque measurement in a roller drive mechanism. [Diagram 5] 4 is an explanatory diagram showing details of the internal structure of rollers and the like in a roller drive mechanism. FIG. [Figure 6] FIG. 6 is an explanatory diagram showing a schematic cross-sectional structure taken along the line AA in FIG. 5. [Figure 7] 6 is an explanatory diagram illustrating a schematic planar structure of the blocking plate illustrated in FIG. 5. [Figure 8]FIG. 1 is a front view showing the structure of a roller device used in a conventional chassis dynamometer. [Figure 9] 9 is a first explanatory diagram that illustrates a schematic diagram of a torque measuring mechanism in the roller drive mechanism illustrated in FIG. 8. FIG. [Figure 10] FIG. 2 is an explanatory diagram (part 2) that illustrates a schematic diagram of a torque measuring mechanism in a roller drive mechanism. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0039] (Roller device 100) FIG. 1 is an explanatory diagram showing a schematic structure of a roller device 100 used in a chassis dynamometer of this embodiment. FIG. 1 shows a front view seen from the front (+Y direction). FIG. 1 illustrates an XYZ orthogonal coordinate system. When the two tires 6 (6R, 6L) on the front wheel side of a vehicle 60 perform a tire turning operation due to a steering operation, the roller devices 100 shown in FIG. 1 are used as at least the two roller devices on the front wheel side.

[0040] The roller device 100 has a roller device 100R for the front right tire 6R and a roller device 100L for the front left tire 6L. The roller device 100R includes a roller drive mechanism 8R and a roller turning mechanism 30R as main components, while the roller device 100L includes a roller drive mechanism 8L and a roller turning mechanism 30L as main components. In addition, the roller devices 100R and 100L each further include a cooling fan 50, which is a cooler not shown in FIG. 1.

[0041] Fig. 2 is an explanatory diagram of roller drive mechanism 8L as viewed from the side (-X direction). Fig. 3 is an explanatory diagram showing the details of roller drive mechanism 8L. An XYZ orthogonal coordinate system is shown in each of Figs. 2 and 3. Below, roller device 100L will be described as a representative of roller device 100R and roller device 100L with reference to these figures.

[0042] As shown in these figures, the roller device 100L includes a roller turning mechanism 30L and a roller driving mechanism 8L as main components.

[0043] The roller turning mechanism 30L includes as its main components a fixed base 36, a turning motor 42, and a turning bearing 38. The turning bearing 38 is provided on the fixed base 36, and the turning motor 42 is attached adjacent to the side surface of the fixed base 36.

[0044] The swivel motor 42 is a geared motor whose speed can be controlled. A gear 42g is attached to the tip of the swivel motor 42, and the gear 42g meshes with a gear attached to the outer periphery of the swivel base 35. Therefore, the swivel base 35 can be rotated by the rotation of the swivel motor 42.

[0045] The swivel bearing 38 rotatably supports the swivel base 35, and the swivel base 35 is rotated around the center of the swivel bearing 38 by the power of the swivel motor 42. In this manner, the roller swivel mechanism 30L has the swivel base 35 that is rotated by the swivel motor 42.

[0046] The roller drive mechanism 8L above the roller turning mechanism 30L turns in conjunction with the turning of the turning base 35 in the roller turning mechanism 30L. Therefore, the roller turning mechanism 30L can perform a roller turning operation to turn the roller 2L.

[0047] In this way, the roller turning mechanism 30L turns the roller around the roller drive mechanism 8L. The roller drive mechanism 8L includes the roller 2, a cooling fan 50, a rotation bearing pedestal 11, and a swing bearing pedestal 12 as main components.

[0048] Next, the roller drive mechanism 8L will be described. The roller drive mechanism 8L having the roller 2L is provided on the swivel base .

[0049] The roller drive mechanism 8L for a twin roller configuration includes as its main components a base 13, a roller 2L, a rotating bearing stand 11, a swinging bearing stand 12, a rotating shaft 21, a swinging shaft 22, a torque arm 27, and a load cell 28. Here, in correspondence with the roller 2L of the twin roller configuration, the rotating shaft 21 becomes a pair of rotating shafts 21, and the swinging shaft 22 becomes a pair of swinging shafts 22.

[0050] A base 13 is fixed onto the swivel base 35, and a rotary bearing stand 11 and a swing bearing stand 12 are erected on the base 13. The rotary bearing stand 11 rotatably supports a rotary shaft 21, and the swing bearing stand 12 supports a swing shaft 22 to be swingable.

[0051] A roller 2L is provided between the rotary bearing pedestal 11 and the swing bearing pedestal 12. As will be described in detail later, the roller 2L rotates in conjunction with the rotation of the rotating shaft 21.

[0052] A rotating shaft 21 is attached so as to pass through the center of the roller 2L, so that the roller 2L can rotate together with the rotation of the rotating shaft 21. An encoder 23 is attached to the rotating shaft 21, and the rotation speed of the roller 2L is directly measured by the encoder 23. The measurement result of the encoder 23 is also used as a feedback signal for controlling the motor 7.

[0053] Since the roller 2L has a twin configuration, the roller 2L shown in FIGS. 1 and 3 corresponds to either the front roller 2F or the rear roller 2B shown in FIG.

[0054] The roller drive mechanism 8L executes a roller drive operation to rotationally drive the roller 2L. When the roller 2L corresponds to the front roller 2F, which is the first roller, the front roller 2F is rotationally driven, and when the roller 2L corresponds to the rear roller 2B, which is the second roller, the rear roller 2B is rotationally driven.

[0055] On the other hand, the stator structure 72 is provided independent of the motor rotor 71 in terms of rotational movement so as not to be linked to the rotational movement of the motor rotor 71. The oscillating shaft 22 is attached to the stator structure 72 which is not linked to the rotational movement of the motor rotor 71.

[0056] As shown in FIGS. 1 to 3, in a roller device 100, a load cell 28 is attached to an end of a swing shaft 22 via a torque arm 27.

[0057] FIG. 4 is an explanatory diagram showing the torque measurement principle in the roller drive mechanism 8L. The XYZ orthogonal coordinate system is shown in the figure. As shown in FIG. 4, during a running test of the vehicle 60, as the front roller 2F (roller 2L) rotates in the roller rotation direction R1, a reaction force in the rotation direction of the motor 7 built into the roller 2 is transmitted to the swing shaft 22. Therefore, the reaction force of the motor 7 can be measured by the load cell 28.

[0058] The reaction force of the motor 7 reflects a reaction force accompanying the acceleration of the front roller 2F, a force applied by the tire 6L to the front roller 2F during a running test of the vehicle 60, and the like. Specifically, when a force is applied from the tire 6 to the roller 2 during a running test of the vehicle 60, the reaction force of the motor 7 is transmitted as a swing state of the swing shaft 22.

[0059] Therefore, the reaction force of the motor 7 transmitted to the oscillating shaft 22 can be measured by the load cell 28 connected to the oscillating shaft 22 via the torque arm 27.

[0060] In this way, the roller drive mechanism 8L has a torque measurement mechanism including the torque arm 27 and the load cell 28 corresponding to the oscillating shaft 22. As shown in Fig. 2, a torque measurement mechanism (torque arm 27 + load cell 28) is provided corresponding to each of the oscillating shafts 22 of the front roller 2F and the rear roller 2B.

[0061] The roller 2L includes as its main components a roller outer frame 10 and a motor 7 provided within the roller outer frame. The motor 7 includes as its main components a motor rotor 71, a stator structure 72, the rotating shaft 21, and the oscillating shaft 22 described above.

[0062] The stator structure 72 is disposed so as to surround the motor rotor 71, the rotating shaft 21 is connected to the motor rotor 71, and the oscillating shaft 22 is connected to the stator structure 72. The rotating shaft 21 and the oscillating shaft 22 are provided facing each other with respect to the roller 2L.

[0063] Therefore, the rotating shaft 21 rotates in conjunction with the rotational movement of the motor rotor 71. On the other hand, the stator structure 72 is not linked to the rotational movement of the motor rotor 71, and is provided independently of the motor rotor 71 in terms of rotational movement.

[0064] The roller device 100R is the same as the roller device 100L. Niro The roller turning mechanism 30R includes a roller turning mechanism 30R and a roller driving mechanism 8R as main components. The configuration and operation of each part of the roller turning mechanism 30R are the same as those of the roller turning mechanism 30L, and the configuration and operation of each part of the roller driving mechanism 8R are the same as those of the roller driving mechanism 8L.

[0065] Hereinafter, when referring collectively to roller device 100L and roller device 100R, they will be simply referred to as "roller device 100", when referring collectively to roller pair 20L and roller pair 20R, they will be simply referred to as "roller pair 20", and when referring collectively to roller 2L and roller 2R, they will be simply referred to as "roller 2".

[0066] In addition, when roller drive mechanism 8L and roller drive mechanism 8R are collectively referred to, they may simply be referred to as "roller drive mechanism 8", and when roller turning mechanism 30L and roller turning mechanism 30R are collectively referred to, they may simply be referred to as "roller turning mechanism 30".

[0067] Although not shown in Figs. 1 to 4, the chassis dynamometer of this embodiment has a vehicle fixing mechanism that fixes the vehicle 60 placed on the roller device 100 when a running test is performed.

[0068] Fig. 5 is an explanatory diagram showing details of the internal structure of the roller 2, the rotary bearing pedestal 11, and the swing bearing pedestal 12 in the roller drive mechanism 8. Fig. 6 is an explanatory diagram showing a schematic cross-sectional structure taken along the line AA in Fig. 5.

[0069] As shown in these figures, the rotary bearing pedestal 11 has a bearing 61 therein, and the rotary bearing pedestal 11 rotatably supports the rotary shaft 21 by inserting the rotary shaft 21 into the raceway (inner ring) of the bearing 61. The rotary shaft 21 includes a rotor directly connected shaft 21a inside the roller 2 and a bearing pedestal holding shaft 21b outside the roller 2. In the rotary shaft 21, the rotor directly connected shaft 21a and the bearing pedestal holding shaft 21b are connected by drilling a hole in the axial direction of the bearing pedestal holding shaft 21b and inserting the rotor directly connected shaft 21a into this hole. The vertically long rectangular area shown in FIG. 5 is also included in the bearing pedestal holding shaft 21b.

[0070] The roller outer frame 10 has a cylindrical structure having a circular roller bottom surface, and the roller bottom surface includes a first roller bottom surface on the oscillation shaft 22 side and a second roller bottom surface on the rotation shaft 21 side.

[0071] A bearing 62 is provided in the central region of the bottom surface of the first roller of the roller outer frame 10. 。 The bottom surface of the first roller partially protrudes towards the swing bearing stand 12 side in order to accommodate a bearing 62 .

[0072] Meanwhile, the rotating shaft 21 is fixed to the center of the bottom surface of the second roller of the roller outer frame body 10. In this manner, the rotating shaft 21, which is rotatable in conjunction with the rotational operation of the motor rotor 71, is attached to the roller outer frame body 10. In other words, the rotating shaft 21 is attached to the roller outer frame body 10 so as to be able to rotate the roller outer frame body 10.

[0073] The oscillating bearing stand 12 has a bearing 63 therein, and the roller outer frame 10 has a bearing 62 in the central region of the bottom surface of the first roller. The oscillating shaft 22 is supported oscillably by the roller outer frame 10 and the oscillating bearing stand 12, respectively, in a manner in which the oscillating shaft 22 is inserted into the raceways (inner races) of the bearings 62 and 63.

[0074] 5, the stator structure 72 includes, as its main components, a motor stator 721 and a motor case 722. The motor stator 721 is disposed so as to surround the motor rotor 71, and the motor case 722 houses the motor stator 721 with an internal case space S72 secured between the motor stator 721 and the motor case 722.

[0075] The motor stator 721 is not linked to the rotational movement of the motor rotor 71, and is provided independently of the motor rotor 71 in terms of rotational movement. Like the motor stator 721, the motor case 722 is also provided independently of the motor rotor 71 in terms of rotational movement. However, the motor stator 721 and the motor case 722 swing due to the reaction force of the motor 7 acting on them.

[0076] The motor case 722 has a cylindrical structure having a circular case bottom surface, and the case bottom surface includes a first case bottom surface on the oscillation shaft 22 side and a second case bottom surface on the rotation shaft 21 side.

[0077] An end of the oscillating shaft 22 is connected to the center of the first case bottom surface of the motor case 722. In this manner, the oscillating shaft 22, which is not linked to the rotational movement of the motor rotor 71, is attached to the motor case 722.

[0078] As shown in FIG. 5, between the first roller bottom surface of the roller outer frame 10 and the first case bottom surface of the motor case 722, a case outer space S8 is provided.

[0079] The power for driving the motor 7 is supplied from an AC power source 9, which is an external alternating current power source, to the motor 7 in the roller outer frame 10 via a motor wiring L7. That is, the AC power source 9 and the motor 7 are electrically connected by the motor wiring L7. A part of the motor wiring L7 is provided inside the oscillating shaft 22. That is, the motor 7 is an AC motor.

[0080] The circular roller outer frame body bottom surface 10S of the roller outer frame body 10 on the oscillating bearing stand 12 side shown in Fig. 6 is the first roller bottom surface. In the roller outer frame body bottom surface 10S, a plurality of roller openings 15 are provided discretely around the oscillating shaft 22 and the bearing 62 along a circumferential region C10 centered on the oscillating shaft 22. Each of the plurality of roller openings 15 is provided penetrating the roller outer frame body bottom surface 10S. In this manner, the plurality of roller openings 15 are provided along a circumferential region C10 centered on the oscillating shaft 22.

[0081] As shown in FIG. 5, a plurality of case openings 16 are provided penetrating the first case bottom surface of the motor case 722, each of which communicates with the case internal space S72.

[0082] The cooling fan 50, which is a cooler provided outside the roller 2, has a cooling air blowing body 50t that blows out cooling air F2, and is arranged so that the cooling air blowing outlet 50o of the cooling air blowing body 50t faces a part of the circumferential region C10 of the bottom surface 10S of the roller outer frame body.

[0083] As shown in FIG. 5, a duct space S5 is provided penetrating the swing bearing base 12. To The cooling fan 50 is disposed in such a manner that the cooling air blowing main body 50t is inserted. A part of the cooling fan 50 is fixed onto a fan installation stand 14 provided on the base 13.

[0084] Therefore, the cooling fan 50, which is a cooler, can supply the cooling air F2 from any one of the roller openings 15 in the roller outer frame bottom surface 10S into the case outer space S8 by blowing out the cooling air F2 from the cooling air outlet 50o of the cooling air blowing main body 50t. Then, the cooling air F2 can be supplied from the case outer space S8 to the case inner space S72 in the roller outer frame 10 through the case openings 16.

[0085] At this time, the cooling air F2 blown out from the cooling air outlet 50o of the cooling air blowing body 50t is supplied through any one of the roller openings 15 along the axial direction of the swing shaft 22 (X direction).

[0086] In the space outside the case S8 X The axial distance d8, which is the distance in the X direction, is set to be narrower than the axial distance d72, which is the distance in the X direction in the bottom-to-bottom space S72a included in the case internal space S72. Motor stator 721 Bottom (-X direction side) and the first case bottom surface of motor case 722.

[0087] Furthermore, as shown in FIG. 5, a shield plate 52 is provided to cover the outer air outlet region of the circumferential region C10 on the roller outer frame bottom surface 10S other than the region facing the cooling air outlet 50o of the cooling air outlet main body 50t.

[0088] 7 is an explanatory diagram showing a schematic planar structure of the blocking plate 52. An XYZ orthogonal coordinate system is shown in the drawing.

[0089] As shown in the figure, on the roller outer frame bottom surface 10S, a circumferential region C10 having a circular shape centered on the oscillation shaft 22 is provided outside the bearing 62 when viewed in a plan view in the YZ plane.

[0090] The shield plate 52 is provided to cover most of the circumferential region C10. The circumferential region C10 that is not covered by the shield plate 52 is only the duct space S5 and its periphery. The cooling air outlet 50o is present in the duct space S5. Therefore, the shield plate 52 is provided to cover the non-outlet region of the circumferential region C10 on the roller outer frame bottom surface 10S other than the region facing the cooling air outlet 50o.

[0091] 5, the roller outer frame 10 has a plurality of roller openings 17 (second roller openings) that penetrate the second roller bottom surface. Therefore, the roller openings that penetrate the two bottom surfaces of the roller outer frame 10 include a plurality of roller openings 15 (first roller openings) that penetrate the first roller bottom surface, and a plurality of roller openings 17 (second roller openings) that penetrate the second roller bottom surface.

[0092] The motor case 722 has a plurality of case openings 18 (second case openings) that penetrate the second case bottom surface and communicate with the case internal space S72. Therefore, the case openings provided penetrating the two bottom surfaces of the motor case 722 include a plurality of case openings 16 (first case openings) that penetrate the first case bottom surface and a plurality of case openings 18 (second case openings) that penetrate the second case bottom surface.

[0093] In the chassis dynamometer of this embodiment, the roller outer frame 10, the motor stator 721, and the motor case 722 have dimensional characteristics that satisfy the following inequality (1).

[0094] (ID2-ED1)>(ID0-ED2)…(1) In formula (1), “ID2” indicates the inner diameter of the motor case 722, “ED1” indicates the outer diameter of the motor stator 721, “ID0” indicates the inner diameter of the roller outer frame 10, and “ED2” indicates the outer diameter of the motor case 722.

[0095] In FIG. 5, the difference Δ1 becomes the left side (ID2−ED1) of the inequality (1), and the difference Δ2 becomes the right side (ID0−ED2) of the inequality (1).

[0096] (effect) The roller 2 of the roller device 100 in the chassis dynamometer of this embodiment has a motor 7 within the roller outer frame body 10, so that the roller outer frame body 10 can be directly rotated by the rotating shaft 21 connected to the motor rotor 71 of the motor 7.

[0097] Therefore, compared to the conventional configuration shown in Figure 8, the chassis dynamometer of this embodiment can reduce the size of the device by eliminating the need to provide an external motor and a power transmission mechanism to the roller outside the roller.

[0098] In the roller device 200 of the conventional chassis dynamometer shown in FIG. 8, the roller drive motor 48 corresponds to the external motor, and the reducer 5 for the roller pair 20 corresponds to the power transmission mechanism to the rollers.

[0099] In the roller device 100 of the chassis dynamometer of this embodiment, the motor 7 is built into the roller outer frame 10 of the roller 2, eliminating the need for a power transmission mechanism such as a speed reducer 5. This allows the size of the roller drive mechanism 8 in the height direction (Z direction) to be significantly reduced, and the installation space and costs of the roller device 100 can be reduced even including the roller turning mechanism 30.

[0100] Furthermore, the roller drive mechanism 8, which is a main component of the roller device 100 in the chassis dynamometer of this embodiment, is equipped with a cooling fan 50, which is a cooler provided outside the roller 2. Therefore, by supplying cooling air F2 from the cooling fan 50 into the roller outer frame 10 through any one of the multiple roller openings 15 in the roller outer frame 10, the motor 7 present inside the roller outer frame 10 can be effectively cooled.

[0101] The cooling fan 50 in the chassis dynamometer of this embodiment can supply cooling air F2 to the case interior space S72 through a plurality of roller openings 15 provided in the first roller bottom surface of the roller outer frame body 10 and a plurality of case openings 16 provided in the first case bottom surface of the motor case 722.

[0102] Therefore, the chassis dynamometer of this embodiment can effectively cool the motor 7 and the roller outer frame 10 by directly applying the cooling air F2 to the surface of the motor stator 721 and the inner surface of the roller outer frame 10. In addition, the cooling effect can be enhanced by forming the surface of the motor stator 721 into a fin structure.

[0103] Therefore, the chassis dynamometer of this embodiment having the motor 7 built in the roller 2 can perform a running test on the vehicle 60 without any problems.

[0104] In the roller 2 of the chassis dynamometer of this embodiment, the roller outer frame 10, the motor stator 721, and the motor case 722 have dimensional characteristics that satisfy the above-mentioned inequality (1). These dimensional characteristics are characteristics that, with regard to the passage of the cooling air F2, set the spatial volume that requires cooling to be larger than the spatial volume that does not require cooling.

[0105] As a result, since the chassis dynamometer of this embodiment has the above-mentioned dimensional characteristics, it can effectively cool the motor rotor 71 and the motor stator 721, which are the main parts of the motor 7 that require cooling.

[0106] The multiple roller openings 15, which become the first roller openings, are provided along a circumferential region C10 centered on the oscillating shaft 22. Therefore, even when the roller outer frame body 10 is rotating, the cooling air F2 can be blown out from the cooling air outlet 50o of the cooling air blowing main body 50t of the cooling fan 50, so that the cooling air F2 can be reliably supplied to the case outer space S8 through any one of the multiple roller openings 15.

[0107] The roller drive mechanism 8 in the chassis dynamometer of this embodiment is equipped with a shielding plate 52 that covers the outer area of ​​the circumferential region C10 other than the area facing the cooling air outlet 50o, so that the cooling air F2 supplied to the case outer space S8 does not leak outside the roller outer frame body 10 through any of the multiple roller openings 15.

[0108] The cooling air F2 blown out from the cooling air outlet 50o accumulates in the case external space S8. On the other hand, since the area outside the outlet, which is most of the circumferential area C10, is blocked by the blocking plate 52, the cooling air F2 accumulated in the case external space S8 does not leak to the outside, but is accurately guided to the case internal space S72 via the multiple case openings 16.

[0109] As a result, the chassis dynamometer of the present embodiment can improve the cooling effect of the motor 7 by increasing the efficiency of supplying the cooling air F2 from the case exterior space S8 to the case interior space S72.

[0110] In the chassis dynamometer of this embodiment, a plurality of roller openings 17 (second roller openings) are provided on the second roller bottom surface of the roller outer frame 10, and a plurality of case openings 18 (second case openings) are provided on the second case bottom surface of the motor case 722. Therefore, the plurality of roller openings 15 (first roller openings) are used as cooling air. F2 and the roller openings 17 can serve as exhaust ports for the cooling air F2.

[0111] That is, in the roller driving mechanism 8, a cooling air passage is secured by multiple roller openings 15, a case outer space S8, multiple case openings 16 (first case openings), a case inner space S72, multiple case openings 18, and multiple roller openings 17.

[0112] In addition, the second roller bottom surface of the roller outer frame 10 and the second roller bottom surface of the motor case 722 caseA space corresponding to the case outer space S8 exists between the bottom surface and the roller openings 17. In order to increase the efficiency of exhausting the cooling air F2, it is preferable that the roller openings 17 and the case openings 18 are provided at positions facing each other in the YZ plane.

[0113] As a result, the chassis dynamometer of this embodiment can more effectively cool the motor 7 arranged within the roller outer frame 10 of the roller 2 by flowing cooling air F2 through the cooling air passage using the cooling fan 50, which serves as a cooler.

[0114] The chassis dynamometer of this embodiment can perform various tests of the vehicle 60, including roller turning motion, by rotating the roller drive mechanism 8 as a turning object using the roller turning mechanism 30. As described above, the roller drive mechanism 8 includes the rollers 2, the cooling fan 50, the rotating bearing stand 11, and the swinging bearing stand 12 as main components.

[0115] The chassis dynamometer of this embodiment measures the reaction force of the motor 7 transmitted to the swing shaft 22 by a load cell 28 connected to the swing shaft 22 via a torque arm 27. The reaction force of the motor 7 during a running test of the vehicle 60 is accurately reflected in the swing state of the swing shaft 22.

[0116] Therefore, the chassis dynamometer of this embodiment can use the load cell 28 to accurately measure the reaction force of the motor 7 during a running test of the vehicle 60.

[0117] The roller device 100 in the chassis dynamometer of this embodiment further includes an encoder 23 attached to the rotating shaft 21. The encoder 23 directly measures the rotation speed of the roller 2.

[0118] In the roller device 100, the roller outer frame 10 is directly rotated by the rotating shaft 21, so that the encoder 23 can measure the rotation speed of the rotating shaft 21 as the rotation speed of the roller 2 directly with high accuracy.

[0119] The roller drive mechanism 8 included in the roller device 100 in the chassis dynamometer of this embodiment has an AC power source 9 for the motor 7, which is an AC motor, and motor wiring L7.

[0120] For this reason, the chassis dynamometer of this embodiment can smoothly supply AC power from an AC power source 9 provided outside the roller 2 to the motor 7 provided inside the roller 2 via motor wiring L7, a part of which is provided inside the oscillating shaft 22.

[0121] Although the present disclosure has been described in detail, the above description is illustrative in all respects and does not limit the present disclosure. It is understood that countless variations not illustrated can be assumed without departing from the scope of the present disclosure.

[0122] Although the roller device 100 shown in this embodiment is shown as a device for mounting the tire 6 on the front wheel side of the vehicle 60, the roller device 100 may also be used as a device for mounting the tire 6 on the rear wheel side of the vehicle 60. Furthermore, when the roller for mounting the tire 6 on one of the tires 6 on the front wheel side and the rear wheel side of the vehicle 60 is a free roller, it is not necessary to provide the roller device 100 on the free roller side.

[0123] Incidentally, the roller turning mechanism 30 is generally provided in a roller device 100 on which the front tire 6 of the front and rear tires 6 is placed. [Explanation of symbols]

[0124] 6,6L,6R Tires 2,2L,2R Roller 7 Motor 8,8L,8R Roller drive mechanism 9 AC power supply 27 Torque arm 28 Load Cell 11 Rotary bearing stand 12 Swing bearing stand 15,17 Roller opening 16,18 Case opening 30, 30L, 30R Roller turning mechanism 50 Cooling Fan 50o cooling air outlet 52 Barrier 60 vehicles 71 Motor rotor 72 Stator structure 100, 100L, 100R Roller device 721 Motor Stator 722 Motor case C10 Circumferential area L7 Motor wiring

Claims

1. A chassis dynamometer equipped with a roller device, The roller device a roller on which a vehicle tire is placed; a cooler provided outside the roller, The roller is A roller outer frame body, a motor provided within the roller outer frame, The motor a motor rotor; a stator structure disposed to surround the motor rotor; a rotating shaft coupled to the motor rotor; a swing shaft connected to the stator structure, the rotating shaft and the swing shaft being disposed opposite each other with respect to the roller; The roller device a rotary bearing base that rotatably supports the rotary shaft; a swing bearing base that swingably supports the swing shaft, the rotating shaft rotates in conjunction with the rotation of the motor rotor; The swing shaft is not linked to the rotational movement of the motor rotor, the rotating shaft is attached to the roller outer frame so as to be rotatable about the roller outer frame, The roller outer frame has a roller opening, the cooler supplies cooling air to the motor through the roller opening of the roller outer frame. Chassis dynamometer.

2. 2. The chassis dynamometer according to claim 1, The stator structure includes: a motor stator disposed to surround the motor rotor; a motor case that houses the motor stator with an internal space between the motor stator and the motor case secured, the motor case has a case opening communicating with the case internal space, the cooler supplies the cooling air to the case interior space through the roller opening and the case opening. Chassis dynamometer.

3. 3. The chassis dynamometer according to claim 2, the roller outer frame has a cylindrical structure with a circular roller bottom surface, the roller bottom surface including a first roller bottom surface on the swing shaft side and a second roller bottom surface on the rotation shaft side; the motor case has a cylindrical structure with a circular case bottom, the case bottom including a first case bottom on the oscillation shaft side and a second case bottom on the rotation shaft side; the roller housing has a first roller opening penetrating a bottom surface of the first roller, the roller opening including the first roller opening; the motor case has a first case opening penetrating the first case bottom surface and communicating with the case internal space, the case opening including the first case opening; the cooler is provided to supply the cooling air from the first roller opening along the axial direction of the oscillation shaft, When the inner diameter of the motor case is "ID2", the outer diameter of the motor stator is "ED1", the inner diameter of the roller outer frame is "ID0", and the outer diameter of the motor case is "ED2", the motor case, the motor stator, and the roller outer frame satisfy the dimensional characteristic {(ID2-ED1)>(ID0-ED2)}. Chassis dynamometer.

4. 4. The chassis dynamometer according to claim 3, the first roller opening is provided on the bottom surface of the first roller along a circumferential region centered on the oscillation shaft, the cooler has a cooling air outlet for blowing out the cooling air, the cooling air outlet being disposed so as to face a part of the circumferential area, The roller device The cooling air outlet further includes a shielding plate provided to cover an outer area of ​​the circumferential area other than an area facing the cooling air outlet. Chassis dynamometer.

5. 4. The chassis dynamometer according to claim 3, the roller outer frame has a second roller opening penetrating the bottom surface of the second roller, the roller opening including the second roller opening; the motor case has a second case opening penetrating the second case bottom surface and communicating with the case internal space, the case opening including the second case opening; Chassis dynamometer.

6. 6. A chassis dynamometer according to claim 1, The roller device a roller turning mechanism that turns a turning object including the roller, the cooler, the rotary bearing base, and the swing bearing base, Chassis dynamometer.

7. 6. A chassis dynamometer according to claim 1, The roller device a load cell connected to the swing shaft via a torque arm and configured to measure the reaction force of the motor when the roller rotates; Chassis dynamometer.

8. 6. A chassis dynamometer according to claim 1, The roller device an encoder attached to the rotating shaft for measuring the rotational speed of the roller; Chassis dynamometer.

9. 6. A chassis dynamometer according to claim 1, the motor is an AC motor, The roller device an AC power source provided outside the roller for supplying power; a motor wiring that electrically connects the AC power supply and the motor; A part of the motor wiring is provided inside the swing shaft. Chassis dynamometer.

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