Chassis dynamometer

Abstract

With the length direction of an automobile considered as an x axis direction and the width direction thereof considered as a y axis direction, a support mechanism (S) in a chassis dynamometer (CD) is provided with: a tilt support part (2) that is disposed under a load motor (M) and that supports the load motor (M) tiltably in the axial direction of a rotary shaft (M1) of the load motor (M) with respect to the vertical direction; a pivot support part (3) that is disposed under the load motor (M) and that supports the load motor (M) pivotably in the x-y plane; a mount frame (4) that is disposed under the load motor (M) and that is coupled to the load motor (M) via the tilt support part (2); a movable table (1) that is located right under the mount frame (4) and that is coupled to the mount frame (4) via the pivot support part (3); and slide parts (5) that are disposed right under the individual ends of the movable table (1) with respect to the x axis direction and that allow the movable table (1) to slide both in the x axis direction and the y axis direction.

Description

[Technical Field]

[0001] The present invention relates to a chassis dynamo device comprising a load motor having a rotor and a stator housed in a case, the rotor connected to the drive wheel connection of the vehicle and the case housed within the wheelhouse of the vehicle, which applies a torque equivalent to the torque applied to the drive wheels of the vehicle to the drive wheel connection of the vehicle, and a support mechanism on which the load motor is mounted and which causes the load motor to achieve a movement equivalent to the movement of the drive wheels when the vehicle is steered. [Background technology]

[0002] Previously, the applicant has proposed a chassis dynamo device of this type in which the vehicle length direction is the x-axis direction and the vehicle width direction is the y-axis direction, and the support mechanism is made up of a mount frame to which a load motor is fixed and a base base located below the mount frame, with a first movable table that is slidable in one of the x-axis direction and the y-axis direction, a second movable table that is slidable in the other of the x-axis direction and the y-axis direction, and a spherical joint that is tiltable and rotatable in any direction connected in series between the mount frame and the base (see, for example, Patent Document 1).

[0003] When the load motor rotates during a vehicle running test, a counter torque is generated in the opposite direction to the rotation of the load motor, and a radial load associated with this counter torque acts on the spherical joint. Because the direction of the radial load is the same as the direction of movement of the spherical joint, it has been newly discovered that if the magnitude of the radial load becomes large enough, the inner cylinder of the spherical joint may overcome the collar, causing a malfunction in which the spherical joint will no longer function. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2019 / 215864 Summary of the Invention [Problem to be solved by the invention]

[0005] In view of the above, an object of the present invention is to provide a chassis dynamometer device in which a support mechanism can reliably tilt and rotate a load motor regardless of the counter torque generated when the load motor rotates. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention provides a chassis dynamometer device comprising: a load motor having a rotor and a stator housed in a case, the rotor connected to the drive wheel connection of the vehicle, the case being housed in a wheelhouse of the vehicle, the load motor applying a torque equivalent to that applied to the drive wheel connection of the vehicle to the drive wheel connection of the vehicle; and a support mechanism on which the load motor is mounted, causing the load motor to achieve a movement equivalent to that of the drive wheel when the vehicle is steered, the vehicle length direction being the x-axis direction and the vehicle width direction being the y-axis direction, the support mechanism comprising: a tilting support section arranged below the load motor and supporting the load motor so that it can tilt freely in the axial direction of the rotation shaft of the load motor in the up and down direction; a rotating support section arranged below the load motor and supporting the load motor so that it can rotate freely within the xy plane; and a mount frame arranged below the load motor and connected to the load motor via the tilting support section, the load motor is in a neutral position when the load motor is in a position where the axis of the rotation shaft of the load motor is parallel to the y-axis; the tilt support part comprises tilting shafts extending in the x-axis direction protruding from each of legs vertically attached to both ends of the load motor in the x-axis direction; first bearings mounted on the mount frame and supporting each tilting shaft; and first return means for returning the tilted load motor to the neutral position; and the pivot support part comprises, when the load motor is in the neutral position, pivoting shafts vertically attached to the center of the mount frame in both the x-axis and y-axis directions; and second bearings vertically attached to the center of the movable table in both the x-axis and y-axis directions and supporting the pivoting shafts.

[0007] According to the present invention, a spherical joint is not used, and both the tilt support portion and the rotation support portion of the support mechanism are not affected by the radial load associated with the counter torque generated by the rotation of the load motor. Therefore, the support mechanism can reliably realize the tilt and rotation of the load motor.

[0008] In the present invention, each of the first return means preferably includes: a fixed unit having a pair of first inclined pieces extending diagonally upward toward one side and the other side of the y-axis direction when the load motor is in the neutral position, the fixed unit being fixed to each side of the x-axis direction of the mount frame; a movable unit having second inclined pieces facing the first inclined pieces of each fixed unit, the movable unit being fixed to each of the legs of the load motor and tilting together with the load motor; and elastic members interposed between the first inclined pieces of each fixed unit and the second inclined pieces of each movable unit, the elastic members being compressed between the first inclined pieces and the second inclined pieces when each movable unit tilts in conjunction with the tilt of the load motor, generating an elastic force in the elastic members, which returns the load motor to the neutral position when the elastic force is released. This allows the support mechanism to automatically return the load motor to the neutral position, and simplifies the structure of the first return means.

[0009] In the present invention, the sliding section preferably includes a second return means that applies a pushing force to the movable table in a direction opposite to the sliding direction of the movable table when the movable table slides in the x-axis and y-axis directions, and the second return means preferably returns the movable table that has slid in the x-axis and y-axis directions to a neutral position before the sliding. This allows the movable table to be automatically returned to the neutral position before the sliding even if the movable table has slid in at least one of the x-axis and y-axis directions after installing a load motor or after performing a performance test of the vehicle. Therefore, the support mechanism can eliminate the need to return the movable table to the neutral position after installing a load motor or performing a performance test of the vehicle. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a partially cutaway front view schematically illustrating an embodiment of a chassis dynamo device of the present invention; [Figure 2] FIG. 2 is a partially cutaway side view of the chassis dynamometer device shown in FIG. 1. [Figure 3] 2 is a perspective view of a main part showing a part of a tilt support part provided in the chassis dynamometer device shown in FIG. 1 together with a leg part of a load motor. [Figure 4] 3 is a partially cutaway perspective view illustrating an example of a tilted state of a load motor in the chassis dynamometer device shown in FIG. 2. FIG. [Figure 5] 5(a) is a side view of the main part showing the second return means provided on one sliding portion of the chassis dynamometer device shown in FIG. 1 in the x-axis direction, and FIG. 5(b) is a side view of the main part showing the second return means shown in FIG. 5(a) when the load motor shown in FIG. 1 slides in one direction of the x-axis direction. DETAILED DESCRIPTION OF THE INVENTION

[0011] The chassis dynamo device CD will be described with reference to FIGS. 1 and 2. The chassis dynamo device CD includes a load motor M and a support mechanism S on which the load motor M is mounted. The load motor M is connected to a drive wheel coupling of a vehicle (not shown). In the following description, the vehicle length direction is defined as the x-axis direction, and the vehicle width direction is defined as the y-axis direction. The load motor M has a rotor and a stator (not shown) housed in a case M0. The rotor is provided with a magnet, and the stator is wound with a coil to which power is supplied from outside the load motor M. When the load motor M is connected to the drive wheel coupling of the vehicle, the rotor is connected to the rotation shaft M1 of the load motor M and is connected to the drive wheel coupling of the vehicle via the rotation shaft M1. When the rotor is connected to the drive wheel coupling of the vehicle, the case M0 is housed within the wheelhouse of the vehicle. This load motor M applies a torque to the drive wheel coupling of the vehicle equivalent to the torque applied to the drive wheels of the vehicle.

[0012] When no external force is applied to the load motor M, the axis of the rotation shaft M1 is in a neutral position parallel to the y-axis, and the movable base 1, which slides in both the x-axis and y-axis directions, is in a neutral position where it is not sliding in either direction.

[0013] The support mechanism S supports the load motor M so that it can tilt up and down in the axial direction of the rotation axis M1 and can rotate within the xy plane. Specifically, the support mechanism S includes a tilt support unit 2 located below the load motor M and supporting the load motor M so that it can tilt as described above, and a rotation support unit 3 located below the load motor M and supporting the load motor M so that it can rotate within the xy plane. The support mechanism S also includes a mount frame 4 located below the load motor M and connected to the load motor M via the tilt support unit 2, and a movable base 1 located directly below the mount frame 4 and connected to the mount frame 4 via the rotation support unit 3. The support mechanism S also includes slide units 5 located directly below both ends of the movable base 1 in the x-axis direction and enabling the movable base 1 to slide as described above.

[0014] The tilting support part 2 includes: tilting shafts 21 extending in the x-axis direction and protruding from each of legs M2, M2 vertically attached to both ends of the load motor M in the x-axis direction; first bearings 22 attached to the mount frame 4 and supporting each tilting shaft 21; and first return means 23 for returning the tilted load motor M to a neutral position. The mount frame 4 is provided with a bottom wall 41 and an outer peripheral wall 42 rising upward from the periphery of the bottom wall 41, and the first bearings 22 are incorporated inside portions 42a located at both ends of the outer peripheral wall 42 in the x-axis direction. The tilting shafts 21 are fitted into the first bearings 22.

[0015] The rotation support unit 3 includes a rotation shaft 31 vertically disposed at the center of the bottom wall 41 of the mount frame 4 in both the x-axis and y-axis directions, and a second bearing 32 vertically disposed at the center of the movable base 1 in both the x-axis and y-axis directions, supporting the rotation shaft 31. A circular hole 11 having a stepped portion 11a extending vertically in the upper half is formed at the center of the movable base 1 in both the x-axis and y-axis directions. A cylindrical casing 12 having a flange 12a at its upper end is fitted into the lower half of the circular hole 11, with the flange 12a housed in the stepped portion 11a of the circular hole 11, and protrudes downward from the circular hole 11. The protruding length of the casing 12 is less than the height of the slide unit 5. An annular plate 12b protruding radially inward is provided at the lower end of the casing 12. The second bearing 32 is fitted inside the casing 12 with its lower end placed on the annular plate 12b. The upper end of the rotating shaft 31 is joined to the center portions in both the x-axis and y-axis directions of the lower end of the bottom wall 41 of the mount frame 4, and is fitted inside the second bearing 32. The lower end of the casing 12 is closed by a lid 12c.

[0016] Each first return means 23 includes a fixed unit 231 having a pair of first inclined pieces 231a extending diagonally upward toward one side and the other side in the y-axis direction and fixed to one side and the other side in the x-axis direction of the bottom wall 41 of the mount frame 4, and a movable unit 232 having second inclined pieces 232a facing each first inclined piece 231a of the fixed unit 231 and fixed to each leg M2 of the load motor M to tilt together with the load motor M. Each first return means 23 also includes an elastic member 233 interposed between each first inclined piece 231a of the fixed unit 231 and each second inclined piece 232a of the movable unit 232. When the movable unit 23 tilts in conjunction with the load motor M, the elastic member 233 is compressed between each first inclined piece 231a and each second inclined piece 232a, and a resilient force is generated in the elastic member 233. When this resilient force is released, the elastic member 233 returns the load motor M to the neutral position. The elastic member 233 may be, for example, a rubber bushing.

[0017] Specifically, the fixed unit 231 of each first return means 23 is joined to the upper surface of the bottom wall 41 of the mount frame 4 via a rectangular flat plate 231b. The flat plate 231b is disposed between the lower ends of each first inclined piece 231a. The elastic member 233 is fixed to the inner surface of each first inclined piece 231a located on the leg M2 side of the load motor M and protrudes toward the second inclined piece 232a of each movable unit 232. Two elastic members 233 are provided, and are arranged side by side with a step in the x-axis direction. In this embodiment, in order to avoid contact when the load motor M rotates, the upper end of each first inclined piece 231a located near the axis of the rotation shaft 31 of the rotation support part 3 is notched obliquely downward toward the bottom wall 41 of the mount frame 4, forming a notch 231a1.

[0018] 3, the movable unit 232 of each first return means 23 is formed by integrating each second inclined piece 232a and has a V-shape in side view. In each movable unit 232, a notch 232a1 is formed at the upper end of each second inclined piece 232a in a portion located closer to the axis of the rotation shaft 31 of the rotation support part 3, taking into consideration the trajectory of rotation of the load motor M in the xy plane. The notch 232a1 is located on the side where the notch 232a1 is not formed, and a step-down portion 232a is formed one step below this portion. 11 and step-down portion 232a 11 The inclined portion 232a is inclined obliquely downward from the bottom wall 41 of the mount frame 4. 12 Of the two elastic members 233, 233 fixed to the first inclined piece 231a of each fixed unit 231, one is arranged to face the portion of the second inclined piece 232a of each movable unit 232 other than the notched portion 232a1, and the other is arranged to face the second inclined piece 232a at a position lower than the elastic member 233 fixed to the portion other than the notched portion 231a1 of the portion where the notched portion 232a1 is formed.

[0019] The lower end of each leg M2 of the load motor M is divided into an upper portion M21 and a lower portion M22. A rectangular flange M23 of the same size extending in the y-axis direction is provided at the lower end of the upper portion M21 and the upper end of the lower portion M22. The upper portion M21 and the lower portion M22 are fastened together with bolts B by overlapping the flanges M23 one above the other. The main body M22a of the lower portion M22, located directly below the flange M23, is disposed on both ends of the bottom wall 41 of the mount frame 4 in the x-axis direction and is a semicircular plate-like member. The tilting shaft 21 of each tilting support unit 2 is integral with the main body M22a of the leg M22 and protrudes toward the portions 42a located at both ends of the outer peripheral wall 42 of the mount frame 4 in the x-axis direction. Furthermore, the movable unit 232 of each first return means 23 is joined to and integrated with the main body 22a at the portion of the upper end of each second inclined piece 232a on the main body M22a side where the notch 232a1 is not formed. When the load motor M is in the neutral position, in each second return means 23, the surface of each second inclined piece 232a of the movable unit 232 facing each inclined piece 231a of the fixed unit 231 simply contacts the protruding end of the elastic member 233 without compressing it.

[0020] 4, when the load motor M is tilted clockwise when attaching or detaching the load motor M to or from the drive wheel connector of the vehicle, during a performance test of the vehicle, or the like, the lower portion M22 of each leg M2 of the load motor M tilts clockwise around the axis of the tilting shaft 21 of each tilting support portion 2 in accordance with the tilt of the load motor M, just like the load motor M. Therefore, each movable unit 232 integral with the main body M22a of the lower portion M22 also tilts clockwise just like the load motor M. At this time, one second inclined piece 232a of each movable unit 232 compresses the two elastic members 233, 233 fixed to one first inclined piece 231a of each fixed unit 231 facing it, and a resilient force is generated in both elastic members 233, 233. When the clockwise tilting of the load motor M is completed, the elastic force generated in both elastic members 233, 233 is released, and one of the second inclined pieces 232a of each movable unit 232 is pushed back counterclockwise, and this pushing back returns the load motor M to the neutral position. Such tilting of the load motor M from the neutral position and its return to the neutral position occurs in the same way when the load motor M is tilted counterclockwise.

[0021] In the chassis dynamo device CD of this embodiment, a spherical joint is not used in the support mechanism S of the load motor M. Instead, each tilting support member 2 supports the load motor M so that it can tilt up and down in the axial direction of the rotation axis M1 of the load motor M, and the rotation support member 3 provided on the support mechanism S supports the load motor M so that it can rotate freely within the xy plane. That is, the tilting axis 21 provided on each tilting support member 2 extends in the x-axis direction, and the rotation axis 31 provided on the rotation support member 3 extends in the vertical direction. Therefore, both the tilting support members 2 and the rotation support member 3 provided on the support mechanism S are not affected by the radial load associated with the counter torque generated by the rotation of the load motor M. Therefore, the support mechanism S can reliably realize the tilting and rotation of the load motor M.

[0022] Furthermore, since each first return means 23 includes the fixed units 231, the movable units 232, and the elastic members 233, 233 as described above, the support mechanism S can automatically return the load motor M to the neutral position, and the structure of the first return means 23 can be simplified. Furthermore, the rotation of the load motor M is not hindered.

[0023] Returning to Figures 1 and 2, each slide unit 5 of the support mechanism S includes a first slide base 51 and a second slide base 52. Four rails 51a extending in the y-axis direction are fixed at predetermined intervals on the upper surface of the first slide base 51. One slider 51b is provided on each rail 51a, allowing it to slide in the longitudinal direction. The movable base 1 is placed on a total of eight sliders 51b, allowing it to slide in the y-axis direction. Four rails 52a extending in the x-axis direction are fixed at predetermined intervals on the upper surface of the second slide base 52. One slider 52b is also provided on each rail 52a, allowing it to slide in the longitudinal direction. The first slide base 51 is placed on a total of eight sliders 52b, allowing it to slide in the x-axis direction. This allows the movable base 1 to slide freely in the x-axis direction. In this way, each slide portion 5 enables the movable base 1 to slide in both the x-axis direction and the y-axis direction, and the mount frame 4 connected to the movable base 1 via the pivot support portion 22 is also similarly capable of sliding in both the x-axis direction and the y-axis direction, resulting in the load motor M being able to slide in both the x-axis direction and the y-axis direction.

[0024] When conducting a driving test of a vehicle, the second slide table 52 provided on each slide section 5 is placed immovably on an installation table 6 fixed at a predetermined position on the floor or the like of the test site.

[0025] Each slide section 5 is provided with a second return means 54 in a cutout 53 formed by cutting downward the center of the top surface of each of the first slide base 51 and the second slide base 52. The second return means 54 applies a pushing force to the movable base 1 in the opposite direction to the sliding direction of the movable base 1 when the movable base 1 slides in the x-axis direction and the y-axis direction. The second return means 54 returns the movable base 1, which has slid in the x-axis direction and the y-axis direction, to the neutral position it was in before sliding.

[0026] The second return means 54 will be described with reference to Figures 5(a) and (b). The second return means 54 shown in Figures 5(a) and (b) is provided on the slide part 5 located at one end in the x-axis direction of the movable base 1 shown in Figure 1 (the left end in Figure 1). In the slide part 5 located at the other end in the x-axis direction (the right end) of the movable base 1, the second return means 54 is arranged symmetrically with the second return means 54 shown in Figures 5(a) and (b), with the axis of rotation shaft 31 of the rotation support part 3 as the axis of symmetry.

[0027] A first fixed plate 51c protrudes downward from the underside of the first slide base 51, from a portion located closer to the pivot support 3 shown in FIG. 1. The lower end of the first fixed plate 51c does not contact the lower end surface of the notch 53. The first fixed plate 51c also has a slot 51c1 extending in the x-axis direction and opening in the y-axis direction. Meanwhile, a second fixed plate 52c protrudes upward from the upper surface of the second slide base 52, from a portion located farther from the pivot support 3. The upper end of the second fixed plate 52c does not contact the underside of the first slide base 51. An air damper 54a is used for the second return means 54. The air damper 54a includes a cylinder 54a1 elongated in the x-axis direction, a piston rod 54a2 extending in and out of the cylinder 54a1, and a head 54a3 attached to the end of the piston rod 54a2 opposite the cylinder 54a1. One end 54a of the cylinder 54a1 located on the opposite side to the head 54a3 11 is fixed to the second fixed plate 52c by a first pin 7. The head 54a3 is provided with a second pin 8 inserted in the y-axis direction and movable in the length direction within the elongated hole 51c1 of the first fixed plate 51c.

[0028] When the movable base 1 shown in FIG. 1 slides in one direction along the x-axis (to the left in FIG. 1), the first slide base 51 of the support part 5 slides in the same direction as the movable base 1, accompanied by the movable base 1, as shown in FIG. 5(b). At this time, the head 54a3 moves in one direction along the x-axis while the second pin 8 is in contact with the other end of the elongated hole 51c1 in the x-axis direction (the right end in FIG. 5). The piston rod 54a3 enters the interior of the cylinder 54a1, and the internal pressure of the cylinder 54a1 increases. The limit of sliding of the movable base 1 in one direction along the x-axis is when the head 54a3 comes into contact with the cylinder 54a1. When the performance test of the automobile is completed and the sliding of the movable base 1 is stopped, the internal pressure of the cylinder 54a1 pushes the head 54a3 back in the other direction along the x-axis, and the movable base 1 returns to the neutral position shown in FIG. 5(a).

[0029] When the movable base 1 slides in the other direction along the x-axis (to the right in FIG. 1), the air damper 54a serving as the second return means 54 in the slide unit 5 located on the other side of the x-axis (the right side in FIG. 1) shown in FIG. 1 operates as described above, returning the movable base 1 to the neutral position when the slide stops. Meanwhile, in the slide unit 5 shown in FIGS. 5(a) and 5(b), the second pin 8 only moves within the elongated hole 51c1 from the other end to one end in the x-axis direction (from the right end to the left end in FIGS. 5(a) and 5(b)), and the piston rod 54a2 does not enter the cylinder 54a1. Therefore, the internal pressure of the cylinder 54a1 does not change in the air damper 54a serving as the return means 54 shown in FIGS. 5(a) and 5(b). Thus, when the movable base 1 slides in either direction along the x-axis, the air damper 54a serving as the second return means 54 provided in one of the slide units 5 returns the movable base 1 to the neutral position.

[0030] 1, a protruding member similar to first fixed plate 51c is provided on movable base 1 at a position corresponding to notch 53 formed in first slide base 51, and a protruding member similar to second fixed plate 52c is provided on first slide base 51. Air damper 54a as second return means 54 is provided in notch 53 of first slide base 51 in the same manner as above. Therefore, sliding of movable base 1 in the y-axis direction and return to the neutral position are performed in the same manner as above.

[0031] Since each slide section 5 is provided with the second return means 54 as described above, even if the movable base 1 slides in at least one of the x-axis direction or the y-axis direction after the load motor M is installed or after a performance test of the automobile, the movable base 1 can be automatically returned to the neutral position before sliding. Therefore, the support mechanism S can save the effort of returning the movable base 1 to the neutral position after the load motor M is installed or after a performance test of the automobile.

[0032] Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited thereto. For example, the shapes of the first inclined pieces 231a of each fixed unit 231 and the second inclined pieces 232a of each movable unit 232, as well as the configuration, structure, and number of elastic members 233, are not particularly limited. Furthermore, the second return means 54 can be an air damper 54a or an appropriate member that generates elastic force, such as a spring, and can be selected and used. [Explanation of symbols]

[0033] CD...chassis dynamo device, M...load motor, M1...rotating shaft, M2...leg, S...support mechanism, 1...movable base, 2...tilting support part, 21...tilting shaft, 22...first bearing, 23...first return means, 231...fixed unit, 231a...first inclined piece, 232...movable unit, 232a...second inclined piece, 233...elastic member, 3...rotating support part, 31...rotating shaft, 32...second bearing, 4...mount frame, 5...slide part, 54...second return means.

Claims

1. A chassis dynamo device comprising: a load motor having a rotor and a stator housed in a case, the case being housed in a wheelhouse of the vehicle with the rotor connected to a drive wheel connection of the vehicle, the load motor applying a torque equivalent to that applied to the drive wheel of the vehicle to the drive wheel connection of the vehicle; and a support mechanism on which the load motor is mounted, causing the load motor to realize a movement equivalent to that of the drive wheel when the vehicle is steered, With the vehicle length direction of the automobile being the x-axis direction and the vehicle width direction being the y-axis direction, the support mechanism comprises: a tilting support section that is arranged below the load motor and supports the load motor so that it can tilt freely in the axial direction of the rotation shaft of the load motor in the vertical direction; a rotation support section that is arranged below the load motor and supports the load motor so that it can rotate freely within the x-y plane; a mount frame that is arranged below the load motor and connected to the load motor via the tilting support section; a movable table that is located directly below the mount frame and connected to the mount frame via the rotation support section; and slide sections that are arranged directly below both ends of the movable table in the x-axis direction and allow the movable table to slide in both the x-axis direction and the y-axis direction, a neutral position of the load motor is defined as a position of the load motor in which the axis of the rotation shaft of the load motor is parallel to the y-axis, and the tilt support unit includes: tilt shafts extending in the x-axis direction and protruding from legs vertically extending from both ends of the load motor in the x-axis direction; first bearings provided on the mount frame and supporting the respective tilt shafts; and first return means for returning the tilted load motor to the neutral position; A chassis dynamometer device characterized in that the rotation support portion comprises a rotation axis vertically installed at the center of both the x-axis and y-axis directions of the mount frame when the load motor is in a neutral position, and a second bearing vertically installed at the center of both the x-axis and y-axis directions of the movable base to support the rotation axis.

2. 2. The chassis dynamometer apparatus according to claim 1, wherein each of the first return means comprises: fixed units fixed to the mount frame on one side and the other side in the x-axis direction when the load motor is in a neutral position, the fixed units having a pair of first inclined pieces extending diagonally upward toward one side and the other in the y-axis direction; movable units having second inclined pieces facing the first inclined pieces of each fixed unit, the movable units being fixed to each of the legs of the load motor and tilting together with the load motor; and elastic members interposed between the first inclined pieces of each fixed unit and the second inclined pieces of each movable unit, the elastic members being compressed between the first inclined pieces and the second inclined pieces when the movable units tilt in conjunction with the tilt of the load motor, generating an elastic force in the elastic members, and when this elastic force is released, the elastic members returning the load motor to the neutral position.

3. A chassis dynamometer device as described in claim 1 or 2, characterized in that the sliding section is provided with a second return means that applies a pushing force to the movable platform in a direction opposite to the sliding direction of the movable platform when the movable platform slides in the x-axis direction and y-axis direction, and the second return means returns the movable platform that has slid in the x-axis direction and y-axis direction to its neutral position before sliding.

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