JP7440383B2 - Simulated wheels and automobile testing equipment using them - Google Patents

Description

The present invention relates to a simulated wheel and an automobile testing device using the same.

2. Description of the Related Art Automotive testing equipment has conventionally been used for research and development, design, quality control, etc. of automobiles. BACKGROUND OF THE INVENTION With recent technological advances, automobiles in the automobile industry are becoming more sophisticated and functional, and in response to this, automobile testing equipment is also required to have higher measurement accuracy.

There are various types of automobile testing equipment depending on the test content. One such device is a device that measures the torque of an axle while a braking device absorbs the power transmitted to the axle. In this type of vehicle testing device, a simulated wheel is mounted on the axle of a vehicle to be measured, and the simulated wheel is connected to a dynamometer provided outside the vehicle via a constant velocity joint or the like. Then, by rotating the axle with the drive source and applying a load to the axle of the vehicle from the dynamometer, the torque output from the axle of the vehicle is measured.

Specifically, by forming a part of the simulated wheel of the automobile testing device thinner than the other part, a ring-shaped strain-generating part is provided, which is a part where structural distortion is likely to occur when torque is applied. Then, a plurality of strain gauges are attached at predetermined intervals to the strain-generating part, and a resistance bridge circuit is formed using the strain gauges as resistors, and shear stress is generated on the surface of the strain-generating part by the torque applied to the strain-generating part. The magnitude of is detected by each strain gauge, and the magnitude of the change in output voltage relative to input voltage appearing by the resistor bridge circuit is converted into torque.

For example, Patent Document 1 discloses an automobile testing device in which a simulated wheel is connected to an axle provided on the vehicle body side via a brake plate and a hub, and a connecting shaft of a torque meter and a dynamometer is connected to the simulated wheel. has been done.

JP 2017-101958 Publication

In order to improve the measurement accuracy of this type of automobile testing device, it is desirable that the strain-generating portion provided on the simulated wheel or the like be deformed only by the drive output. However, in FIG. 3 of Patent Document 1, the vehicle weight is supported by two bearings, so the vehicle weight acts on each component located closer to the vehicle body than the bearings. That is, in the conventional structure, since the torque meter is located closer to the vehicle body than the bearing, the weight of the vehicle cannot be avoided from acting on the strain-generating portion. Therefore, the torque meter detects even the distortion of the strain-generating part caused by the vehicle weight, and accurately detects only the amount of deformation based on the drive output and the load on the dynamometer, that is, the torque based on the drive source. I couldn't do it.

On the other hand, in the structure of claims 1 and 2 of Patent Document 1, the torque meter is located closer to the dynamometer than the bearing, so the strain-generating portion is not affected by the vehicle weight (see FIG. 2 of Patent Document 1). ). However, if the torque measurement unit with the strain-generating part is located outside the simulated wheel rather than inside the simulated wheel, the vehicle weight does not affect the strain-generating part, but the structure that exists between the simulated wheel and the strain-generating part Since mechanical losses occur in the parts, the axle drive output cannot be accurately detected.

According to the present invention, the weight of the automobile does not act on the strain-generating part, and the deformation of the strain-generating part due to the drive output and the load from the dynamometer can be accurately detected, and the mechanical loss that causes measurement errors is eliminated. An object of the present invention is to provide a simulated wheel that can accurately measure the torque output from an axle while eliminating the occurrence of such occurrences, and an automobile testing device using the same.

The simulated wheel of the present invention and the automobile testing device using the same are characterized by having the following configuration.
(1) Outer ring portion on which the tire is mounted.
(2) A center disk disposed on the inner peripheral side of the outer ring portion via a bearing.
(3) A strain-generating section that is provided on the center disk and detects the output of the axle of the vehicle to be measured.
(4) A shaft-side fixing portion that is provided on the inner peripheral side of the strain-generating portion of the center disk and fixes the connecting shaft and the center disk.
(5) An axle-side fixing part that is provided on the outer peripheral side of the strain-generating part in the center disc and fixes the axle and the center disc.

In the present invention, it is also possible to employ the following configurations (1) to (3).
(1) The axle-side fixing part includes a connection adapter that has one surface connected to a hub fixed to an end of the axle and the other surface connected to the axle-side surface of the center disk.

(2) The connection adapter is fixed to the center disk in a state where it is overlapped with a portion on the outer peripheral side of the strain-generating portion on the surface of the center disk on the axle side.

(3) A recess formed in a direction opposite to the axle is provided on the outer peripheral side of the strain-generating portion on the surface of the center disk on the axle side, and the connection adapter is inserted into the recess. , the connection adapter is fitted in such a manner that the outer peripheral surface of the connection adapter and the inner peripheral surface of the recess are in contact with each other.

According to the present invention, since the axle is fixed to the outer circumferential side of the center disk rather than the strain-generating portion, the weight of the automobile transmitted to the center disk via the axle does not act on the strain-generating portion, and only the drive output is applied. Deformation of the strain-generating portion can be detected accurately. Additionally, if the torque measurement unit with the strain-generating part is located outside the simulated wheel rather than inside the simulated wheel, mechanical loss will occur in the components that exist between the simulated wheel and the strain-generating part. In the present invention, since the strain generating part is provided on the center disk in the simulated wheel, the occurrence of mechanical loss that causes measurement errors is eliminated, and the torque output from the axle can be accurately measured. be able to.

FIG. 2 is a schematic diagram showing the state of use of the first embodiment, in which (a) is a front view and (b) is a plan view. FIG. 2 is a cross-sectional view showing the configuration of the first embodiment. FIG. 3 is a cross-sectional view showing the configuration of a second embodiment.

[1. First embodiment]
[1-1. composition]
The simulated wheel 100 of the first embodiment will be described below. The simulated wheel 100 has the approximate shape of an automobile wheel, and is provided corresponding to each tire 2 of the automobile 1 to be measured. As shown in FIG. 1, the simulated wheel 100 is installed on the inner periphery of the tire 2 by replacing the wheel of the automobile 1. The simulated wheel 100 is connected to a flange 5 provided at the end of a connecting shaft 4 connected to a dynamometer 3 for use.

As shown in FIG. 2, the simulated wheel 100 has a disk-shaped center disk 101 and an annular outer ring portion 102 provided coaxially with the center disk 101. As shown in FIG. The center disk 101 is arranged on the inner peripheral side of the outer ring portion 102 via a bearing. A first bearing 103 and a second bearing 104 are provided as bearings for the simulated wheel 100. The first bearing 103 is arranged between the outer peripheral surface of the center disk 101 and the inner peripheral surface of the outer ring portion 102. The center disk 101 is rotatable around the axis of the axle 6 relative to the outer ring portion 102 by a first bearing 103 .

The outer ring portion 102 is provided on the outermost circumferential side of the simulated wheel 100, and the tire 2 is mounted on the rim on the outer circumferential surface.

The simulated wheel 100 has a ring portion 105 having an annular shape. The ring portion 105 is connected to the inner peripheral side of the outer ring portion 102 via a second bearing 104. The ring portion 105 is rotatable around the axis of the axle 6 relative to the outer ring portion 102 by the second bearing 104 .

A locking member 106 can be selectively attached to the surface of the simulated wheel 100 on the axle 6 side by fixing it to each of the center disk 101 and the outer ring portion 102 with bolts. The rotation preventing member 106 prevents relative rotation between the center disk 101 and the outer ring portion 102 so that the center disk 101 and the outer ring portion 102 move together when installed.

The center disk 101 is connected to the axle via a strain generating part 107 that detects the output of the axle 6 of the automobile 1 to be measured, a shaft-side fixing part 108 that fixes the connecting shaft 4 and the center disk 101, and a connecting adapter 109. 6 and the center disk 101 are provided. The shaft-side fixing part 108 is provided on the inner circumferential side of the strain-generating part 107 in the center disk 101, and the axle-side fixing part 110 is provided on the outer circumferential side of the strain-generating part 107. That is, the center disk 101 is provided with a shaft-side fixing part 108, a strain-generating part 107, and an axle-side fixing part 110 concentrically from the center toward the outer circumference.

The shaft-side fixing portion 108 is provided on the inner peripheral side of the strain-generating portion 107 in the center disk 101 and fixes the connecting shaft 4 and the center disk 101. In order to connect the connecting shaft 4 to the center disk 101, the shaft side fixing portion 108 is provided with a plurality of shaft connecting bolt holes 111a each having a female thread formed on the inner periphery. These shaft connection bolt holes 111a are provided in radial positions aligned with the shaft connection bolt holes 111b provided in the flange 5 of the connection shaft 4, lined up in the circumferential direction, and at the same angular intervals.

The axle-side fixing portion 110 is provided on the outer peripheral side of the strain-generating portion 107 in the center disk 101 and fixes the axle 6 and the center disk 101 together. The axle-side fixing part 110 is provided with a plurality of connecting adapter connecting bolt holes 112a having internal threads formed on the inner periphery in order to connect the axle 6 and the hub 7 to the center disk 101. These connection adapter connection bolt holes 112a are provided in radial positions aligned with the connection adapter connection bolt holes 112b provided in the connection adapter 109, lined up in the circumferential direction, and at the same angular intervals.

The strain generating section 107 is provided on the center disk 101 and detects the output of the axle 6 of the automobile 1 to be measured. The strain-generating portion 107 is provided in an annular shape between the shaft connecting bolt hole 111a of the center disk 101 and the connecting adapter connecting bolt hole 112a. The strain-generating portion 107 is formed thinner than other portions of the center disk 101 so that it is easily distorted. A plurality of strain gauges 113 are attached to the strain generating section 107 to detect the amount of strain of the strain generating section 107 .

A wireless transmitter 114 is fixed to the surface of the center disk 101 on the dynamometer 3 side. The wireless transmitter 114 wirelessly transmits the amount of strain detected by the strain gauge 113 to the receiving antenna 115. The receiving antenna 115 is fixed on the inner circumferential side of the ring portion 105.

In order to supply power used by the strain gauge 113 and the wireless transmitter 114, a power receiving coil 116 is fixed to the outer peripheral end of the surface of the center disk 101 on the dynamometer 3 side, and a power receiving coil 116 is fixed to the outer peripheral end of the surface of the center disk 101 on the dynamometer 3 side. Power transmission coil 117 is fixed.

The connection adapter 109 has a disk shape with a larger diameter than the strain-generating portion 107, and its outer peripheral end is superimposed and fixed on the surface of the axle-side fixing portion 110 on the axle 6 side. The surface of the connection adapter 109 on the axle 6 side is a flat surface that is joined to the hub 7. On the other hand, a step 109a is provided on the surface of the connection adapter 109 on the center disk 101 side so that a portion facing the strain-generating portion 107 and the shaft-side fixing portion 108 is recessed toward the axle 6 side.

A hub connecting bolt hole 118 is provided on the inner peripheral side of the connection adapter 109 at a position that is aligned with a hub bolt of the hub 7 . The hub bolt of the hub 7 is inserted into the hub connection bolt hole 118, and a nut is screwed from the dynamometer 3 side, thereby connecting the axle 6 and the hub 7 to the connection adapter 109. The connection adapter 109 near the hub connection bolt hole 118 is formed into a tapered shape, a spherical shape, or an angular shape depending on the type of nut shape.

A connecting adapter connecting bolt hole 112b having a female thread formed on the inner circumference is provided on the outer peripheral side of the connecting adapter 109 at a position that aligns with the connecting adapter connecting bolt hole 112a of the center disk 101. Bolts are inserted into the connection adapter connection bolt holes 112a and connection adapter connection bolt holes 112b, and the tips of the bolts are screwed into the female threads of the connection adapter connection bolt holes 112b, thereby connecting the center disk 101 and the connection adapter 109. Fixed.

[1-2. Effect]
In the automobile testing device using the simulated wheel 100, in the case of a bench test, which is a test conducted with the automobile 1 kept in the same place as shown in FIG. After removal, the tire 2 is attached to the outer ring portion 102 of the simulated wheel 100.

The axle 6 side of the connection adapter 109 is connected to the hub 7 by passing the hub bolt of the hub 7 of the automobile 1 through the hub connection bolt hole 118 of the connection adapter 109 and tightening a nut. Next, the axle 6 side of the center disk 101 is connected to the connection adapter 109 by passing bolts through the connection adapter connection bolt hole 112b and the connection adapter connection bolt hole 112a, thereby connecting the axle 6 and the center disk 101. do. Thereafter, the shaft-side fixing portion 108 of the center disk 101 is connected to the connection shaft 4 by passing bolts through the shaft connection bolt hole 111a of the center disk 101 and the shaft connection bolt hole 111b of the flange 5.

A power supply line is connected to the power transmission coil 117 of the ring section 105 to supply power from the outside, and the reception antenna 115 of the ring section 105 is connected to an external reception device through a signal line. Note that an analysis device that measures the torque output from the axle 6 of the automobile 1 from the amount of distortion received by the receiving device is connected to the external receiving device.

The rotation preventing member 106 between the center disk 101 and the outer ring part 102 is removed, so that the center disk 101 can freely rotate with respect to the outer ring part 102. In an automobile test device using such a simulated wheel 100, when the automobile 1 is driven, the center disk 101 connected to the hub 7 of the automobile 1 rotates, but the outer ring portion 102 rotates freely relative to the center disk 101. Then, the tire 2 mounted on the outer ring portion 102 does not rotate, and the automobile 1 continues to remain in place.

When a load is applied to the center disk 101 from the dynamometer 3 via the connection shaft 4, a strain corresponding to the torque output from the axle 6 of the automobile 1 is generated in the strain-generating portion 107 of the center disk 101. This distortion is detected by the strain gauge 113, and the detected amount of distortion is sent to the receiving device via the wireless transmitting device 114, receiving antenna 115, and signal line. An analysis device connected to the receiving device measures the torque output from the axle 6 of the automobile 1 based on the amount of distortion received by the receiving device.

[1-3. effect]
The effects of this embodiment having the above-described configuration and operation are as follows.

(1) Since the axle 6 is fixed to the axle-side fixing part 110 on the outer circumferential side of the center disc 101 rather than the strain-generating part 107, the weight of the automobile 1 transmitted to the center disc 101 via the axle 6 is fixed to the axle side. It is transmitted to the tire 2 via the section 110. Therefore, since the weight of the vehicle is not applied to the strain-generating portion 107 disposed on the inner periphery of the axle-side fixing portion 110, deformation of the strain-generating portion 107 caused only by the drive output can be accurately detected.

(2) If the torque measurement unit including the strain-generating portion 107 is located outside the simulated wheel 100 rather than inside the simulated wheel 100, mechanical loss of components existing between the simulated wheel 100 and the strain-generating portion 107 As a result, torque measurement accuracy becomes low. In this embodiment, since the strain-generating portion 107 is provided in the center disk 101 of the simulated wheel 100, the occurrence of mechanical loss that causes measurement errors is eliminated, and the torque output from the axle 6 is accurately produced. can be measured.

(3) By using the connection adapter 109, it is possible to easily fix the axle 6 to the center disk 101 on the outer peripheral side of the installation position of the strain-generating portion 107. Further, by using the connection adapter 109, the fixing surface can be provided wide, so that the axle 6 and the center disk 101 can be firmly fixed.

(4) Since the shaft-side surface of the connection adapter 109 is overlapped with the axle-side surface of the center disk 101, the axle-side surface of the center disk 101 may remain flat; There is no need to perform processing to match the shape of the connection adapter 109. With such a simple structure, the connection adapter 109 and the center disk 101 can be fixed, and manufacturing costs can be reduced.

(5) A step 109a recessed toward the axle 6 is provided in a portion of the connection adapter 109 that faces the shaft-side fixing portion 108 of the center disk 101. Therefore, when the connection adapter 109 and the center disk 101 are connected with the connection adapter 109 and the hub 7 fixed, the hub bolts and nuts do not come into contact with the center disk 101.

[2. Second embodiment]
In the second embodiment, as shown in FIG. 3, a recess 119 is formed in the outer peripheral side of the strain-generating portion 107 on the surface of the center disk 101 on the axle 6 side in a direction opposite to the axle 6. The connection adapter 109 is fitted into the recess 119 such that the outer peripheral surface of the connection adapter 109 and the inner peripheral surface of the recess 119 are in contact with each other. The other configurations are the same as those in the first embodiment.

The effects of the second embodiment having such a configuration are as follows.

(1) Since the concave portion 119 supports the vehicle weight in the radial direction, no force in the direction of gravity acts on the contact surface of the bolt fastening portion. In this way, by supporting the vehicle weight in the radial direction, it is possible to prevent the connection adapter 109 and the center disk 101 from deforming due to the vehicle weight, and the strain generating part 107 can detect only the drive output. become.

(2) Since the vehicle weight is received by the outer peripheral surface of the connection adapter 109 and the inner peripheral surface of the recess 119, the load applied to the bolts that fix the connection adapter 109 and the center disc 101 is small, reducing the risk of breakage of the fixing bolts. can do.

(3) The stacked thickness of the center disk 101, the connection adapter 109, and the hub 7 is reduced, and the portion that fixes the center disk 101 and the axle 6 can be made smaller and lighter.

[3. Other embodiments]
Although embodiments including modifications have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, substitutions, and changes can be made without departing from the gist of the invention. These embodiments and their modifications are included within the scope and gist of the invention as well as within the scope of the invention described in the claims and its equivalents. Below is an example.

(1) In the above embodiment, the connection adapter 109 is used for the axle-side fixing part 110, but if the hub 7 of the axle 6 can be fixed to the outer circumferential side of the strain-generating part 107 provided on the center disk 101, the center The disk 101 may be directly fixed to the hub 7.

(2) Instead of providing the recess 119 in the center disc 101, a recess is provided on the connection adapter 109 side, a protrusion is provided on the axle side of the center disc 101, and the connection adapter 109 is fitted and fixed in the center disc 101. Good too. Even in that case, by supporting the vehicle weight in the radial direction, it is possible to prevent the connection adapter 109 and the center disk 101 from deforming due to the vehicle weight.

(3) It is possible to connect the connecting shaft 4, center disk 101, and axle 6 by using a spoke-shaped center disk 101 or by shifting the positions of various bolt holes in the radial and circumferential directions. For example, the center disk 101 and the connection adapter 109 may be integrally formed by casting aluminum or the like.

(4) Since the simulated wheels 100 of the present invention can be installed by replacing the wheels of the automobile 1, the tires 2 actually used on the automobile 1 can be used as they are, but the tires 2 that are actually used on the automobile 1 can be used as they are. A simulated tire may also be used.

(5) Although the receiving device is provided outside the simulated wheel 100, the receiving device may be provided in the ring portion 105 together with the receiving antenna 115. Further, depending on the output of the wireless transmitter 114, the receiving antenna 115 may be provided outside the simulated wheel 100.

1... Car 2... Tire 3... Dynamometer 4... Connection shaft 5... Flange 6... Axle 7... Hub 100... Simulated wheel 101... Center disc 102... Outer ring portion 103... First bearing 104... Second bearing 105... Ring portion 106 ... Rotation member 107 ... Strain part 108 ... Shaft side fixing part 109... Connection adapter 109a... Step 110... Axle side fixing part 111a, b... Shaft connection bolt hole 112a, b... Connection adapter connection bolt hole 113... Distortion Cage 114...Radio transmitter 115...Receiving antenna 116...Power receiving coil 117...Power transmitting coil 118...Hub connection bolt hole 119...Recess

Claims (5)

an outer ring portion on which the tire is mounted;
a center disk disposed on the inner peripheral side of the outer ring portion via a bearing;
a strain-generating part that is provided on the center disk and that detects the output of the axle of the vehicle to be measured;
a shaft-side fixing part that is provided on the inner peripheral side of the strain-generating part in the center disk and fixes the connecting shaft and the center disk;
an axle-side fixing part that is provided on the outer peripheral side of the strain-generating part in the center disc and fixes the axle and the center disc;
A simulated wheel characterized by comprising: The axle-side fixing part includes a connection adapter that has one surface connected to a hub fixed to an end of the axle and the other surface connected to the axle-side surface of the center disk. The simulated wheel according to claim 1. 3. The connection adapter according to claim 2, wherein the connection adapter is fixed to the center disk in a state where it is superimposed on an outer peripheral side portion of the strain-generating portion on the surface of the center disk on the axle side. simulated wheels. A recess formed in a direction opposite to the axle is provided in a portion on the outer peripheral side of the strain-generating portion on the surface of the center disk on the axle side, and the connection adapter is inserted into the recess into the connection adapter. The simulated wheel according to claim 2 or 3, wherein the adapter is fitted in such a manner that the outer circumferential surface of the adapter and the inner circumferential surface of the recess are in contact with each other. An automobile testing device using the simulated wheel according to claims 1 to 4.