Chassis dynamometer

Abstract

The purpose of the present disclosure is to provide a structure for a chassis dynamometer in which the installation space is reduced. A roller (2) in a roller device (100) provided in the chassis dynamometer of the present disclosure includes a motor (2) provided in a roller outer frame (10). In a motor (2), a rotating shaft (21) is attached to a roller outer frame (10) so as to be rotatable in conjunction with the rotational operation of a motor rotor (71), and a swing shaft (21) is attached to a stator structure (72) so as not to be in conjunction with the rotational operation of the motor rotor (71). The rotating shaft (21) is supported by a rotating bearing stand (11), and the oscillating shaft (22) is supported by an oscillating bearing stand (12). A cooling fan (50) for supplying 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 for various driving tests of a vehicle. Background Art

[0002] Conventionally, a chassis dynamometer is used for driving tests of a vehicle (automobile), and includes a roller device as a main component. In addition, the chassis dynamometer has a vehicle fixing mechanism for fixing a vehicle disposed on the roller device during a driving test. As a conventional chassis dynamometer, for example, there is a chassis dynamometer disclosed in Patent Document 1.

[0003] In order to perform various driving tests accompanying a steering operation of a vehicle, it is necessary to perform a roller rotation operation for rotating the roller in accordance with the rotation action of the tire. That is, in order to implement a control method for causing the roller devices for the left and right tires to follow the deflection angle of the tire generated by the steering operation, a roller rotation operation is required. The above control method can be applied to autonomous driving and ADAS simulation driving tests. In addition, "ADAS (Advanced Driver Assistance System)" refers to an "advanced driving system", which is a system that detects the possibility of an accident or the like in advance and avoids it.

[0004] As a chassis dynamometer having a roller rotation function, for example, there is a chassis dynamometer included in a vehicle test device disclosed in Patent Document 2.

[0005] (Roller device 200)

[0006] Figure 8 is a front view schematically showing the structure of a roller device 200 used in a conventional chassis dynamometer having a roller rotation function represented by Patent Document 2. In Figure 8 shows a front view observed from the front (+Y direction). Figure 8 an XYZ orthogonal coordinate system is described. In the case where the two tires 6 (6R, 6L) on the front wheel side of the vehicle 60 perform a tire rotation operation by a steering operation, as at least two roller devices on the front wheel side, the Figure 8 shown roller device 200 is used.

[0007] The roller device 200 has a roller device 200R for the tire 6R on the right side of the front wheel and a roller device 200L for the tire 6L on the left side of the front wheel. Hereinafter, the roller device 200L among the roller devices 200R and 200L will be described as a representative.

[0008] As shown in this figure, the roller device 200L includes a roller rotation mechanism 300L and a roller drive mechanism 80L as main components.

[0009] The roller rotating mechanism 300L includes a fixed base 36 , a rotating motor 42 , and a rotating bearing 38 as main components. The rotating bearing 38 is provided on the fixed base 36 , and the rotating motor 42 is attached adjacent to a side surface of the fixed base 36 .

[0010] The rotation motor 42 is a geared motor capable of speed control. A gear 42g is mounted on the front end of the rotation motor 42, and the gear mounted on the outer periphery of the rotation base 35 is meshed with the gear 42g. Therefore, the rotation base 35 can be rotated by the rotation of the rotation motor 42.

[0011] The rotary bearing 38 rotatably supports the rotary base 35, and the rotary base 35 is rotated by the power of the rotating motor 42 about the center of the rotary bearing 38. Thus, the roller rotating mechanism 300L includes the rotary base 35 rotated by the rotating motor 42.

[0012] In conjunction with the rotation of the rotating base 35 in the roller rotating mechanism 300L, the roller driving mechanism 80L located above the roller rotating mechanism 300L rotates. Therefore, the roller rotating mechanism 300L can perform a roller rotating operation for rotating the roller pair 20 .

[0013] Next, the roller drive mechanism 80L will be described. The roller drive mechanism 80L including the roller pair 20 is provided on the rotary base 35 .

[0014] The roller drive mechanism 80L to which the twin roller structure is applied includes as main components a roller drive motor 48, an encoder 49, a coupling 43, a speed reducer 5 including a gear box, etc., a roller pair 20, and a rotating shaft 41. Here, the rotating shaft 41 corresponds to the roller pair 20 to form a pair of rotating shafts 41.

[0015] The roller drive motor 48 and the speed reducer 5 are fixed to the rotary base 35, and the roller drive motor 48, which is a driving source, rotates the pair of rotating shafts 41 through the coupling 43 and the speed reducer 5. Specifically, the rotational motion transmission function is divided into two in the speed reducer 5, so that the pair of rotating shafts 41 can be rotationally driven. In addition, the rotation speed of each roller pair 20 based on the rotation speed of the roller drive motor 48 is measured by the encoder 49. The measurement result of the encoder 49 is also used as a feedback signal for controlling the roller drive motor 48.

[0016] Although in Figure 8 Although not shown in the figure, a pair of roller bearing stands are provided on the rotary base 35 so as to straddle the roller driving motor 48, and the pair of rotating shafts 41 rotatably supports the roller pair 20 between the speed reducer 5 and the pair of roller bearing stands.

[0017] By installing a pair of rotating shafts 41 in such a manner as to penetrate the respective central portions of the roll pairs 20, the roll pairs 20 can perform a rotating action together with the rotation of the pair of rotating shafts 41.

[0018] Therefore, the roll drive mechanism 80L can perform a roll drive action of rotationally driving the front roll 20F as the first roll and a roll drive action of rotationally driving the rear roll 20B as the second roll.

[0019] In addition, it is also possible to form a double-roll structure by providing two roll drive mechanisms 80L applicable to a single-roll structure on the rotary base 35.

[0020] In addition, the roll device 200R is similarly provided on the rotary base 35 as the roll device 200L, and includes a roll rotation mechanism 300R and a roll drive mechanism 80R as main components. The component configurations and action contents of the roll rotation mechanism 300R are the same as those of the roll rotation mechanism 300L, and the component configurations and action contents of the roll drive mechanism 80R are the same as those of the roll drive mechanism 80L.

[0021] Hereinafter, when collectively referring to the roll device 200L and the roll device 200R, it is sometimes simply referred to as "roll device 200", and when collectively referring to the roll pairs 20L and 20R, it is sometimes simply referred to as "roll pair 20".

[0022] In addition, when collectively referring to the roll drive mechanism 80L and the roll drive mechanism 80R, it is sometimes simply referred to as "roll drive mechanism 80", and when collectively referring to the roll rotation mechanism 300L and the roll rotation mechanism 300R, it is sometimes simply referred to as "roll rotation mechanism 300".

[0023] Figure 9 And Figure 10 are explanatory views schematically showing the torque measuring mechanism in the roll drive mechanism 80R. Figure 9 And Figure 10 respectively describe the XYZ orthogonal coordinate system.

[0024] As shown in these figures, a roll drive motor 48 is supported on the rotary base 35 via a swing bearing 47 and an oil film 46. As Figure 9 shown, two combinations of the swing bearing 47 and the oil film 46 are provided with respect to the roll drive motor 48.

[0025] Since the roll drive motor 48 is supported in a floating state on the rotary base 35 via the oil film 46, it has the characteristic that the loss of the rotation direction of the roll drive motor 48 is reduced.

[0026] A force measuring element 45 is mounted on the side of the motor 48 for roller drive via a torque arm 44. When a reaction force is generated in the rotational direction of the motor 48 for roller drive during the running test of the vehicle 60, the motor 48 for roller drive is supported in a free state in the rotational direction, so that the reaction force of the motor 48 for roller drive can be measured by the force measuring element 45.

[0027] In addition, in the roller drive mechanism 80L, a torque measuring mechanism similar to that of the roller drive mechanism 80R is of course provided.

[0028] Prior Art Documents

[0029] Patent Documents

[0030] Patent Document 1: Japanese Patent Laid-Open No. 53-1579

[0031] Patent Document 2: Japanese Patent Laid-Open No. 2023-89808 Summary of the Invention

[0032] Problems to be Solved by the Invention

[0033] Figures 8 to 10 In the conventional chassis dynamometer, the roller device 200 shown requires a roller drive mechanism 80 to rotationally drive the roller pair 20. The roller drive mechanism 80 requires relatively large components such as a motor 48 for roller drive and a speed reducer 5.

[0034] The roller device 200 is usually installed in an area called an underground pit under the ground on which the vehicle 60 is placed. However, due to the large device size of the roller device 200, it is necessary to take measures such as making the underground pit deeper to ensure a relatively wide installation space for the roller device 200.

[0035] For example, in Figure 8 In the conventional chassis dynamometer shown, a roller drive mechanism 80R needs to be provided for the tire 6R, and a roller drive mechanism 80L needs to be provided for the tire 6L. Therefore, it is necessary to increase the dimension in the height direction (Z direction) to make up for the dimension limitation in the width direction (X direction). Therefore, the speed reducer 5 as a power transmission mechanism needs to increase the dimension in the height direction corresponding to the reduction of the dimension in the width direction.

[0036] In this way, the conventional chassis dynamometer has a problem that the installation space becomes too wide corresponding to the increase in the device size of the roller device 200.

[0037] In the present disclosure, an object is to solve the above problems and provide a structure of a chassis dynamometer that realizes a reduction in the installation space.

[0038] Means for Solving the Problems

[0039] The chassis dynamometer disclosed herein comprises a roller device, the roller device comprising: a roller on which a tire of a vehicle is mounted; and a cooler arranged outside the roller, the roller comprising: a roller outer frame; and a motor arranged in the roller outer frame, the motor comprising: a motor rotor; a stator structure configured to surround the motor rotor; a rotating shaft connected to the motor rotor; and a swing shaft connected to the stator structure, the rotating shaft and the swing shaft being arranged opposite to each other with the roller as a reference, the roller device further comprising: a rotating bearing stand supporting the rotating shaft so as to be rotatable; and a swing bearing stand supporting the swing shaft so as to be swingable, the rotating shaft rotates in conjunction with the rotating action of the motor rotor, the swing shaft does not rotate in conjunction with the rotating action of the motor rotor, the rotating shaft is mounted on the roller outer frame in a manner that enables the roller outer frame to rotate, the roller outer frame having a roller opening, and the cooler supplies cooling air to the motor via the roller opening of the roller outer frame.

[0040] Effects of the Invention

[0041] Since the roller included in the roller device in the chassis dynamometer of the present disclosure has a motor in the roller outer frame, the roller outer frame can be directly rotated by the rotating shaft of the motor.

[0042] Therefore, compared with the conventional configuration in which an external motor for rotating the roller is provided outside the roller, the chassis dynamometer disclosed in the present invention does not require an external motor for rotating the roller and a power transmission mechanism to the roller, and can accordingly achieve a reduction in the size of the device.

[0043] Furthermore, since the roller device in the chassis dynamometer of the present disclosure includes a cooler provided outside the roller, the motor in the roller outer frame can be effectively cooled by supplying cooling air to the motor through the roller opening provided in the roller outer frame.

[0044] The objects, features, aspects and advantages of the present disclosure will become more apparent from the following detailed description and accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is an explanatory diagram schematically showing the structure of a roller device used in the chassis dynamometer according to the present embodiment.

[0046] Figure 2 Observed from the side Figure 1 An explanatory diagram of the roller drive mechanism shown.

[0047] Figure 3 It is an explanatory diagram showing the details of the roller driving mechanism.

[0048] Figure 4 It is an explanatory diagram showing the torque measurement principle of the roller drive mechanism.

[0049] Figure 5 It is an explanatory view showing the details of the internal structure of a roll or the like in a roll drive mechanism.

[0050] Figure 6 It schematically shows Figure 5 the A-A sectional structure of

[0051] Figure 7 It schematically shows Figure 5 the plan view structure of the baffle shown in

[0052] Figure 8 It is a front view showing the structure of the roll device used in a conventional chassis dynamometer.

[0053] Figure 9 It schematically shows Figure 8 the torque measuring mechanism in the roll drive mechanism shown in

[0054] Figure 10 It is an explanatory view (part one) showing the torque measuring mechanism of the roll drive mechanism. Detailed implementation mode

[0055] (Roll device 100)

[0056] Figure 1 It is an explanatory view schematically showing the structure of the roll device 100 used in the chassis dynamometer of this embodiment. In Figure 1 a front view observed from the front (+Y direction) is shown. Figure 1 an XYZ orthogonal coordinate system is described. When the two tires 6 (6R, 6L) on the front wheel side of the vehicle 60 perform tire rotation operations through a steering operation, as at least two roll devices on the front wheel side, the roll device 100 shown in Figure 1 is used.

[0057] The roll device 100 has a roll device 100R for the tire 6R on the right side of the front wheel and a roll device 100L for the tire 6L on the left side of the front wheel. The roll device 100R includes a roll drive mechanism 8R and a roll rotation mechanism 30R as main components, and the roll device 100L includes a roll drive mechanism 8L and a roll rotation mechanism 30L as main components. In addition, the roll device 100R and the roll device 100L each further include a cooling fan 50 as a cooler not shown in Figure 1 this figure.

[0058] Figure 2 It is an explanatory view observing the roll drive mechanism 8L from the side direction (-X direction). Figure 3 It is an explanatory view showing the details of the roll drive mechanism 8L. Figure 2and Figure 3 XYZ orthogonal coordinate systems are described respectively. Hereinafter, with reference to these drawings, the roller device 100R and the roller device 100L will be described as a representative.

[0059] As shown in these drawings, the roller device 100L includes a roller rotating mechanism 30L and a roller driving mechanism 8L as main components.

[0060] The roller rotating mechanism 30L includes a fixed base 36 , a rotating motor 42 , and a rotating bearing 38 as main components. The rotating bearing 38 is provided on the fixed base 36 , and the rotating motor 42 is attached adjacent to a side surface of the fixed base 36 .

[0061] The rotation motor 42 is a geared motor capable of speed control. A gear 42g is mounted on the front end of the rotation motor 42, and the gear mounted on the outer periphery of the rotation base 35 is meshed with the gear 42g. Therefore, the rotation base 35 can be rotated by the rotation of the rotation motor 42.

[0062] The rotary bearing 38 rotatably supports the rotary base 35, and the rotary base 35 is rotated by the power of the rotating motor 42 about the center of the rotary bearing 38. Thus, the roller rotating mechanism 30L includes the rotary base 35 rotated by the rotating motor 42.

[0063] In conjunction with the rotation of the rotating base 35 in the roller rotating mechanism 30L, the roller driving mechanism 8L located above the roller rotating mechanism 30L rotates. Therefore, the roller rotating mechanism 30L can perform a roller rotating operation for rotating the roller 2L.

[0064] In this way, the roller rotating mechanism 30L performs roller rotating operation with the roller driving mechanism 8L as the rotating object. The roller driving mechanism 8L includes the roller 2, a cooling fan 50 described later, a rotating bearing stand 11, and a swinging bearing stand 12 as main components.

[0065] Next, the roller drive mechanism 8L will be described. The roller drive mechanism 8L including the roller 2L is provided on the rotary base 35 .

[0066] The roller drive mechanism 8L to which the twin roller structure is applied includes 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 force sensor 28 as main components. Here, the rotating shaft 21 becomes a pair of rotating shafts 21, and the swinging shaft 22 becomes a pair of swinging shafts 22 corresponding to the roller 2L of the twin roller structure.

[0067] A base 13 is fixed on a rotary base 35, and a rotary bearing table 11 and a swing bearing table 12 are erected on the base 13. The rotary bearing table 11 supports a rotary shaft 21 so that it can rotate, and the swing bearing table 12 supports a swing shaft 22 so that it can swing.

[0068] A roller 2L is provided between the rotary bearing table 11 and the swing bearing table 12. As will be described later, the roller 2L rotates as the rotary shaft 21 rotates.

[0069] By installing the rotary shaft 21 in such a way as to penetrate the central portion of the roller 2L, the roller 2L can perform a rotation action together with the rotation of the rotary shaft 21. An encoder 23 is installed on the rotary shaft 21, and the rotation speed of the roller 2 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.

[0070] Since the roller 2L has a double structure, Figure 1 and Figure 3 the roller 2L shown corresponds to Figure 2 either the front roller 2F or the rear roller 2B shown.

[0071] A roller drive mechanism 8L performs a roller drive action of rotationally driving the roller 2L. When the roller 2L corresponds to the front roller 2F as the first roller, the front roller 2F is rotationally driven, and when the roller 2L corresponds to the rear roller 2B as the second roller, the rear roller 2B is rotationally driven.

[0072] On the other hand, in order not to be linked to the rotation action of the motor rotor 71, the stator structure 72 is provided independently of the motor rotor 71 with respect to the rotation action. Moreover, the swing shaft 22 is installed on the stator structure 72 that is not linked to the rotation action of the motor rotor 71.

[0073] As Figures 1 to 3 shown, in the roller device 100, a force measuring element 28 is installed at the end of the swing shaft 22 via a torque arm 27.

[0074] Figure 4 is an explanatory diagram showing the torque measurement principle in the roller drive mechanism 8L. An XYZ orthogonal coordinate system is shown in this figure. As Figure 4 shown, during the running test of the vehicle 60, as the front roller 2F (roller 2L) rotates along the roller rotation direction R1, a reaction force along the rotation direction of the motor 7 built in the roller 2 is transmitted to the swing shaft 22. Therefore, the reaction force of the motor 7 can be measured by the force measuring element 28.

[0075] The reaction force of the motor 7 reflects the reaction force accompanying the acceleration of the front roller 2F, the force applied to the front roller 2F by the tire 6L during the running test of the vehicle 60, etc. Specifically, when a force is applied to the roller 2 from the tire 6 during the running test of the vehicle 60, the reaction force of the motor 7 is transmitted as the swing state of the swing shaft 22.

[0076] Therefore, the reaction force of the motor 7 transmitted to the swing shaft 22 can be measured by the force measuring cell 28 connected to the swing shaft 22 via the torque arm 27 .

[0077] Thus, the roller driving mechanism 8L has a torque measuring mechanism including the torque arm 27 and the load cell 28 corresponding to the swing shaft 22. Figure 2 As shown, a torque measuring mechanism (torque arm 27 + load cell 28) is provided corresponding to each swing shaft 22 of the front roller 2F and the rear roller 2B.

[0078] The roller 2L includes a roller outer frame 10 and a motor 7 provided in the roller outer frame as main components. The motor 7 includes a motor rotor 71 and a stator structure 72, and the above-mentioned rotating shaft 21 and swinging shaft 22 as main components.

[0079] 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 swing shaft 22 is connected to the stator structure 72. The rotating shaft 21 and the swing shaft 22 are provided to face each other with reference to the roller 2L.

[0080] Therefore, the rotating shaft 21 rotates in conjunction with the rotation of the motor rotor 71. On the other hand, the stator structure 72 does not rotate in conjunction with the rotation of the motor rotor 71, and is provided independently of the motor rotor 71 in terms of the rotation.

[0081] In addition, the roller device 100R is installed on the rotating base 35 similarly to the roller device 100L, and includes a roller rotating mechanism 30R and a roller driving mechanism 8R as main components. The components and operation contents of the roller rotating mechanism 30R are the same as those of the roller rotating mechanism 30L, and the components and operation contents of the roller driving mechanism 8R are the same as those of the roller driving mechanism 8L.

[0082] Hereinafter, when roller device 100L and roller device 100R are collectively referred to, they are sometimes simply referred to as “roller device 100”, when roller pair 20L and roller pair 20R are collectively referred to, they are sometimes simply referred to as “roller pair 20”, and when roller 2L and roller 2R are collectively referred to, they are sometimes simply referred to as “roller 2”.

[0083] In addition, when the roller driving mechanism 8L and the roller driving mechanism 8R are collectively referred to, they are sometimes simply referred to as the “roller driving mechanism 8 ”, and when the roller rotating mechanism 30L and the roller rotating mechanism 30R are collectively referred to, they are sometimes simply referred to as the “roller rotating mechanism 30 ”.

[0084] In addition, although Figures 1 to 4 Although not shown in the figure, the chassis dynamometer of the present embodiment has a vehicle fixing mechanism for fixing the vehicle 60 disposed on the roller device 100 when performing a running test.

[0085] Figure 5 It is an explanatory diagram showing the details of the internal structure of the roller 2 , the rotation bearing stand 11 , and the swing bearing stand 12 in the roller driving mechanism 8 . Figure 6 It is schematically indicated Figure 5 An illustration of the AA cross-section structure.

[0086] As shown in these figures, the rotating bearing table 11 has a bearing 61 inside, and the rotating bearing table 11 supports the rotating shaft 21 so that it can rotate by inserting the rotating shaft 21 into the raceway ring (inner ring) of the bearing 61. In addition, the rotating shaft 21 includes a rotor direct-connection shaft 21a inside the roller 2 and a bearing table retaining shaft 21b outside the roller 2. In the rotating shaft 21, the rotor direct-connection shaft 21a and the bearing table retaining shaft 21b are connected in the form of a hole opened in the axial direction of the bearing table retaining shaft 21b and the rotor direct-connection shaft 21a is inserted into the hole. In addition, Figure 5 The vertically long rectangular region shown is also included in the bearing stand retaining shaft 21b.

[0087] 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 swing shaft 22 side and a second roller bottom surface on the rotation shaft 21 side.

[0088] The bearing 62 is provided in the central region of the first roller bottom surface of the roller outer frame 10 . Since the bearing 62 is provided on the first roller bottom surface, a part of the first roller bottom surface protrudes toward the swing bearing stand 12 side.

[0089] On the other hand, a rotating shaft 21 is fixed to the center of the second roller bottom surface of the roller outer frame 10. In this way, the rotating shaft 21 that can rotate in conjunction with the rotation of the motor rotor 71 is attached to the roller outer frame 10. That is, the rotating shaft 21 is attached to the roller outer frame 10 in a manner that enables the roller outer frame 10 to rotate.

[0090] The swing bearing stand 12 has a bearing 63 inside, and the roller outer frame 10 has a bearing 62 in the central area of ​​the bottom surface of the first roller. In addition, the swing shaft 22 is inserted into the respective raceways (inner races) of the bearings 62 and 63, and the swing shaft 22 is supported by the roller outer frame 10 and the swing bearing stand 12 so as to be swingable.

[0091] As shown Figure 5 in FIG. 234, the stator structure 72 includes a motor stator 721 and a motor housing 722 as main components. The motor stator 721 is arranged so as to surround the motor rotor 71, and the motor housing 722 houses the motor stator 721 in a state where an inner housing space S72 is ensured between the motor stator 721 and the motor housing 722.

[0092] 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 with respect to the rotational movement. The motor housing 722 is also provided independently of the motor rotor 71 with respect to the rotational movement, similarly to the motor stator 721. However, since the reaction force of the motor 7 is applied to the motor stator 721 and the motor housing 722, the motor stator 721 and the motor housing 722 swing.

[0093] The motor housing 722 has a cylindrical structure with a circular housing bottom surface, and the housing bottom surface includes a first housing bottom surface on the side of the swing shaft 22 and a second housing bottom surface on the side of the rotation shaft 21.

[0094] The end of the swing shaft 22 is connected to the center of the first housing bottom surface of the motor housing 722. In this way, the swing shaft 22 that is not linked to the rotational movement of the motor rotor 71 is mounted on the motor housing 722.

[0095] As shown Figure 5 in FIG. 243, a housing outer space S8 is provided between the first roller bottom surface of the roller outer frame 10 and the first housing bottom surface of the motor housing 722.

[0096] In addition, the power supply for driving the motor 7 is supplied from an AC power supply 9, which is an external AC power supply, to the motor 7 in the roller outer frame 10 via a motor wiring L7. That is, the AC power supply 9 is electrically connected to the motor 7 through the motor wiring L7. A part of the motor wiring L7 is provided inside the swing shaft 22. That is, the motor 7 is an AC motor.

[0097] Figure 6 The circular roller outer frame bottom surface 10S of the roller outer frame 10 on the side of the swing bearing table 12 shown in FIG. 248 becomes the first roller bottom surface. In the roller outer frame bottom surface 10S, a plurality of roller openings 15 are discretely provided along a circumferential region C10 centered on the swing shaft 22 around the swing shaft 22 and the bearing 62. The plurality of roller openings 15 are each provided so as to penetrate the roller outer frame bottom surface 10S. In this way, the plurality of roller openings 15 are provided along the circumferential region C10 centered on the swing shaft 22.

[0098] As shown Figure 5 in FIG. 251, a plurality of housing openings 16 are provided that penetrate the first housing bottom surface of the motor housing 722 and are respectively communicated with the inner housing space S72.

[0099] A cooler disposed outside the roller 2, namely a cooling fan 50, has a cooling air blowing main body 50t that blows out cooling air F2. The cooling air outlet 50o of the cooling air blowing main body 50t is arranged to face a part of the circumferential region C10 of the bottom surface 10S of the roller outer frame.

[0100] As Figure 5 shown, a duct space S5 is provided through the bearing table 12 for swinging, and the cooling fan 50 is arranged in such a way that the cooling air blowing main body 50t of the duct space S5 is inserted. In addition, a part of the cooling fan 50 is fixed to a fan mounting table 14 provided on the base 13.

[0101] Therefore, the cooling fan 50 as the cooler blows out the cooling air F2 from the cooling air outlet 50o of the cooling air blowing main body 50t, whereby the cooling air F2 can be supplied into the outer space S8 of the housing from any one of the plurality of roller openings 15 on the bottom surface 10S of the roller outer frame. And the cooling air F2 can be supplied from the outer space S8 of the housing into the inner space S72 of the housing within the roller outer frame 10 through the plurality of housing openings 16.

[0102] At this time, the cooling air F2 blown out from the cooling air outlet 50o of the cooling air blowing main body 50t is supplied along the axial direction (X direction) of the swing shaft 22 through any one of the plurality of roller openings 15.

[0103] The interval in the Y direction in the outer space S8 of the housing, namely the axial distance d8, is set to be narrower than the interval in the X direction in the bottom surface space S72a included in the inner space S72 of the housing, namely the axial distance d72. The bottom surface space S72a is the space between the first roller bottom surface of the roller outer frame 10 and the first housing bottom surface of the motor housing 722 in the inner space S72 of the housing.

[0104] And, as Figure 5 shown, a baffle plate 52 is provided to cover the blowing outlet outer region other than the region of the circumferential region C10 of the bottom surface 10S of the roller outer frame that faces the cooling air outlet 50o of the cooling air blowing main body 50t.

[0105] Figure 7 is an explanatory diagram schematically showing the planar structure of the baffle plate 52. An XYZ orthogonal coordinate system is shown in this figure.

[0106] As shown in this figure, in the bottom surface 10S of the roller outer frame, a circumferential region C10 centered on the swing shaft 22 is provided at a position outside the bearing 62 when viewed from above in the YZ plane.

[0107] The baffle 52 is disposed so as to cover most of the circumferential region C10. The circumferential region C10 not covered by the baffle 52 is only the duct space S5 and its periphery. There is a cooling air outlet 50o within the duct space S5. Accordingly, the baffle 52 is disposed so as to cover the outlet outer region other than the region of the circumferential region C10 of the bottom surface 10S of the roll outer frame that faces the cooling air outlet 50o.

[0108] As Figure 5 shown, the roll outer frame 10 has a plurality of roll openings 17 (second roll openings) that penetrate the bottom surface of the second roll. Accordingly, the roll openings that penetrate the two bottom surfaces of the roll outer frame 10 include a plurality of roll openings 15 (first roll openings) that penetrate the bottom surface of the first roll and a plurality of roll openings 17 (second roll openings) that penetrate the bottom surface of the second roll.

[0109] The motor housing 722 has a plurality of housing openings 18 (second housing openings) that penetrate the bottom surface of the second housing and communicate with the space S72 within the housing. Accordingly, the housing openings that penetrate the two bottom surfaces of the motor housing 722 include a plurality of housing openings 16 (first housing openings) that penetrate the bottom surface of the first housing and a plurality of housing openings 18 (second housing openings) that penetrate the bottom surface of the second housing.

[0110] In the chassis dynamometer of the present embodiment, the roll outer frame 10, the motor stator 721, and the motor housing 722 have dimensional characteristics that satisfy the following inequality (1).

[0111] (ID2 - ED1) > (ID0 - ED2)…(1)

[0112] In Equation (1), "ID2" represents the inner diameter of the motor housing 722, "ED1" represents the outer diameter of the motor stator 721, "ID0" represents the inner diameter of the roll outer frame 10, and "ED2" represents the outer diameter of the motor housing 722.

[0113] In Figure 5 this, the difference Δ1 is the left side (ID2 - ED1) of the inequality (1), and the difference Δ2 is the right side (ID0 - ED2) of the inequality (1).

[0114] (Effect)

[0115] In the roll device 100 of the chassis dynamometer of the present embodiment, the roll 2 has a motor 7 within the roll outer frame 10. Accordingly, the roll outer frame 10 can be directly rotated by the rotary shaft 21 connected to the motor rotor 71 of the motor 7.

[0116] Accordingly, the chassis dynamometer of the present embodiment and Figure 8Compared with the conventional configuration shown, there is no need to provide an external motor and a power transmission mechanism to the roller outside the roller, and accordingly, the downsizing of the device size can be achieved.

[0117] In Figure 8 In the roller device 200 of the conventional chassis dynamometer shown, the roller drive motor 48 corresponds to the external motor, and the speed reducer 5 for the roller pair 20 corresponds to the power transmission mechanism for transmitting power to the roller.

[0118] In the roller device 100 of the chassis dynamometer according to the present embodiment, a motor 7 is built in the roller outer frame 10 of the roller 2, so that a power transmission mechanism such as a speed reducer 5 is not required. Therefore, the size of the roller drive mechanism 8 in the height direction (Z direction) can be significantly reduced, and the installation space and cost of the roller device 100 can be reduced even including the roller rotation mechanism 30.

[0119] Moreover, the roller drive mechanism 8, which is a main component of the roller device 100 in the chassis dynamometer according to the present embodiment, includes a cooling fan 50 as a cooler provided outside the roller 2. Therefore, by supplying the cooling air F2 from the cooling fan 50 into the roller outer frame 10 through any one of the plurality of roller openings 15 of the roller outer frame 10, the motor 7 existing in the roller outer frame 10 can be effectively cooled.

[0120] The cooling fan 50 in the chassis dynamometer according to the present embodiment can supply the cooling air F2 into the housing inner space S72 through the plurality of roller openings 15 provided on the first roller bottom surface of the roller outer frame 10 and the plurality of housing openings 16 provided on the first housing bottom surface of the motor housing 722.

[0121] Therefore, the chassis dynamometer according to the present 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, by setting the surface of the motor stator 721 to a fin structure, the cooling effect can be improved.

[0122] Therefore, the chassis dynamometer according to the present embodiment in which the motor 7 is built in the roller 2 can perform a running test on the vehicle 60 without any obstacles.

[0123] In the roller 2 of the chassis dynamometer according to the present embodiment, the roller outer frame 10, the motor stator 721, and the motor housing 722 have dimensional characteristics that satisfy the above inequality (1). This dimensional characteristic is a characteristic of setting the volume of the space that needs to be cooled larger than the volume of the space that does not need to be cooled with respect to the passage of the cooling air F2.

[0124] As a result, since the chassis dynamometer according to the present embodiment has the above 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 need to be cooled.

[0125] A plurality of roller openings 15 that form the first roller opening portion are provided along a circumferential region C10 centered on the swing axis 22. Therefore, even when the roller outer frame 10 performs a rotational movement, by blowing the cooling air F2 from the cooling air outlet 50o of the cooling air blowing body 50t of the cooling fan 50, the cooling air F2 can be reliably supplied to the outer space S8 of the housing via any one of the plurality of roller openings 15.

[0126] The roller drive mechanism 8 in the chassis dynamometer of the present embodiment is provided with a baffle plate 52 that is arranged so as to cover the outer blowing port region other than the region facing the cooling air outlet 50o in the circumferential region C10. Therefore, the cooling air F2 supplied to the outer space S8 of the housing does not leak from any one of the plurality of roller openings 15 to the outside of the roller outer frame 10.

[0127] The cooling air F2 blown out from the cooling air outlet 50o accumulates in the outer space S8 of the housing. On the other hand, since most of the outer blowing port region of the circumferential region C10 is blocked by the baffle plate 52, the cooling air F2 accumulated in the outer space S8 of the housing does not leak to the outside, but is accurately guided to the inner space S72 of the housing via the plurality of housing openings 16.

[0128] As a result, the chassis dynamometer of the present embodiment can improve the cooling effect of the motor 7 by improving the supply efficiency of the cooling air F2 from the outer space S8 of the housing to the inner space S72 of the housing.

[0129] The chassis dynamometer of the present embodiment is provided with a plurality of roller openings 17 (second roller openings) on the second roller bottom surface of the roller outer frame 10, and a plurality of housing openings 18 (second housing openings) on the second housing bottom surface of the motor housing 722. Therefore, a plurality of roller openings 15 (first roller openings) can be used as supply ports for the cooling air, and a plurality of roller openings 17 can be used as exhaust ports for the cooling air F2.

[0130] That is, in the roller drive mechanism 8, a cooling air passage formed by the plurality of roller openings 15, the outer space S8 of the housing, the plurality of housing openings 16 (first housing openings), the inner space S72 of the housing, the plurality of housing openings 18, and the plurality of roller openings 17 is ensured.

[0131] In addition, there is a space equivalent to the outer space S8 of the housing between the second roller bottom surface of the roller outer frame 10 and the second roller bottom surface of the motor housing 722. In addition, in order to improve the discharge efficiency of the cooling air F2, it is preferable that the plurality of roller openings 17 and the plurality of housing openings 18 are arranged at positions facing each other in the YZ plane.

[0132] As a result, the chassis dynamometer according to the present embodiment allows the cooling air F2 to flow in the cooling air passage by the cooling fan 50 serving as a cooler, thereby being able to more effectively cool the motor 7 disposed within the roller outer frame 10 of the roller 2.

[0133] The chassis dynamometer according to the present embodiment can perform tests on various vehicles 60 including the roller rotation operation by rotating the roller drive mechanism 8 as a rotation object using the roller rotation mechanism 30. Further, as described above, the roller drive mechanism 8 includes the roller 2, the cooling fan 50, the rotating bearing stand 11, and the swing bearing stand 12 as main components.

[0134] The chassis dynamometer according to the present embodiment measures the reaction force of the motor 7 transmitted to the swing shaft 22 by the force measuring element 28 connected to the swing shaft 22 via the torque arm 27. The reaction force of the motor 7 during the running test of the vehicle 60 is accurately reflected in the swing state of the swing shaft 22.

[0135] Therefore, the chassis dynamometer according to the present embodiment can accurately measure the reaction force of the motor 7 during the running test of the vehicle 60 by the pressure measuring element 28.

[0136] The roller device 100 in the chassis dynamometer according to the present embodiment further includes an encoder 23 mounted on the rotating shaft 21. The encoder 23 directly measures the rotational speed of the roller 2.

[0137] Since the roller device 100 directly rotates the roller outer frame 10 through the rotating shaft 21, the encoder 23 can accurately measure the rotational speed of the rotating shaft 21 as the rotational speed of the roller 2.

[0138] The roller drive mechanism 8 included in the roller device 100 in the chassis dynamometer according to the present embodiment has an AC power supply 9 for the motor 7 that is an AC motor and motor wiring L7.

[0139] Therefore, the chassis dynamometer according to the present embodiment can supply AC power from the AC power supply 9 disposed outside the roller 2 to the motor 7 disposed inside the roller 2 without obstruction via the motor wiring L7 partially disposed within the swing shaft 22.

[0140] Although the present invention has been described in detail, the above description is illustrative in all aspects, and the present invention is not limited thereto. It should be understood that countless variations that are not illustrated can be conceived without departing from the scope of the present invention.

[0141] 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, but the roller device 100 can also be used as a device for mounting the tire 6 on the rear-wheel side of the vehicle 60 in the same manner. In addition, when one of the rollers for the tires 6 on the front-wheel side and the rear-wheel side of the vehicle 60 is a free roller, there is no need to provide the roller device 100 on the free-roller side.

[0142] In addition, the roller rotation mechanism 30 is generally provided in the roller device 100 for the tire 6 on the front-wheel side of the tires 6 that are normally mounted on the front-wheel side and the rear-wheel side.

[0143] Description of Reference Numerals

[0144] 6, 6L, 6R Tires

[0145] 2, 2L, 2R Rollers

[0146] 7 Motors

[0147] 8, 8L, 8R Roller Drive Mechanisms

[0148] 9 AC Power Supply

[0149] 27 Torque Arm

[0150] 28 Force Measuring Element

[0151] 11 Rotating Bearing Stand

[0152] 12 Swinging Bearing Stand

[0153] 15, 17 Roller Openings

[0154] 16, 18 Housing Openings

[0155] 30, 30L, 30R Roller Rotation Mechanisms

[0156] 50 Cooling Fan

[0157] 50o Cooling Air Outlet

[0158] 52 Baffle

[0159] 60 Vehicle

[0160] 71 Motor Rotor

[0161] 72 Stator Structure

[0162] 100, 100L, 100R Roller Devices

[0163] 721 Motor Stator

[0164] 722 Motor Housing

[0165] C10 Circumferential Region

[0166] Wiring for L7 motor

Claims

1. A chassis dynamometer, comprising a roller device, wherein: The roller device comprises: Roller, the tire of the vehicle on which it is carried; as well as A cooler is provided outside the roller, The roller comprises: Roller outer frame; and A motor is disposed in the roller outer frame. The motor comprises: Motor rotor; A stator structure is arranged to surround the motor rotor; a rotating shaft connected to the motor rotor; and A swing shaft connected to the stator structure, The rotating shaft and the swinging shaft are arranged opposite to each other with the roller as a reference. The roller device further comprises: a rotating bearing stand for rotatably supporting the rotating shaft; and A swing bearing support supports the swing shaft so that it can swing. The rotating shaft rotates in conjunction with the rotation of the motor rotor. The swing shaft is not linked to the rotation of the motor rotor. The rotating shaft is mounted on the roller outer frame so as to be rotatable. 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.

2. The chassis dynamometer according to claim 1, wherein: The stator structure comprises: a motor stator configured to surround the motor rotor; and a motor housing for accommodating the motor stator while ensuring a space inside the housing between the motor housing and the motor stator; The motor housing has a housing opening communicating with the inner space of the housing. The cooler supplies the cooling air to the space within the casing via the roller opening and the casing opening.

3. The chassis dynamometer according to claim 2, wherein: The roller outer frame has a cylindrical structure having a circular roller bottom surface, wherein the roller bottom surface includes a first roller bottom surface on the swing shaft side and a second roller bottom surface on the rotation shaft side. The motor housing has a cylindrical structure having a circular housing bottom surface, wherein the housing bottom surface includes a first housing bottom surface on the swing shaft side and a second housing bottom surface on the rotation shaft side. The roller outer frame has a first roller opening that passes through the bottom surface of the first roller, and the roller opening includes the first roller opening. The motor housing has a first housing opening that passes through the first housing bottom surface and communicates with the housing inner space, and the housing opening includes the first housing opening. The cooler is provided to supply the cooling air from the first roller opening along the axial direction of the swing shaft. When the inner diameter of the motor housing is set to "ID2", the outer diameter of the motor stator is set to "ED1", the inner diameter of the roller outer frame is set to "ID0", and the outer diameter of the motor housing is set to "ED2", The motor housing, the motor stator, and the roller outer frame satisfy the dimensional characteristics {(ID2-ED1)>(ID0-ED2)}.

4. The chassis dynamometer according to claim 3, wherein: The first roller opening is provided on the bottom surface of the first roller along a circumferential area centered on the swing axis. The cooler has a cooling air outlet for blowing out the cooling air, and the cooling air outlet is arranged to face a portion of the circumferential region. The roller device further includes a shielding plate, which is arranged to cover the air outlet outer region other than the region in the circumferential region facing the air outlet of the cooling air.

5. The chassis dynamometer according to claim 3 or 4, wherein The outer frame of the roller has a second roller opening penetrating the bottom surface of the second roller, and the roller opening includes the second roller opening. The motor housing has a second housing opening penetrating the bottom surface of the second housing and communicating with the inner space of the housing, and the housing opening includes the second housing opening.

6. The chassis dynamometer according to any one of claims 1 to 5, wherein The roller device further includes a roller rotation mechanism, which rotates a rotation object including the roller, the cooler, the rotary bearing table, and the swing bearing table.

7. The chassis dynamometer according to any one of claims 1 to 6, wherein The roller device further includes a force measuring element, which is connected to the swing shaft via a torque arm and measures the reaction force of the motor when the roller rotates.

8. The chassis dynamometer according to any one of claims 1 to 7, wherein The roller device further includes an encoder installed on the rotating shaft and measuring the rotation speed of the roller.

9. The chassis dynamometer according to any one of claims 1 to 8, wherein The motor is an AC motor. The roller device further includes: An AC power supply, arranged outside the roller, for supplying power; and Motor wiring, electrically connecting the AC power supply and the motor. A part of the motor wiring is arranged inside the swing shaft.

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