JPS6038632A - Running performance measuring apparatus - Google Patents

Abstract

PURPOSE:To ensure the accuracy of the measurement with the removal of the interference due to a driving torque by mounting a fixed section at the wheel mounting section while a mobile section is mounted at the wheel to rotate a measuring apparatus itself with the wheel. CONSTITUTION:A measuring apparatus is build up almost with a disk with a strain-causing elastic body, while a mobile section 4 is provided in the perimeter of a fixed section 2 at the center thereof, and the fixed section 2 is demarcated from the mobile section 4 by U-shaped and inverted U-shaped through grooves 6 and 8. A tire 14 is mounted on the mobile section 4 and a wheel mounting flange 20 is mounted on the fixed section 2. The thinnest part of the border between the grooves 6 and 8 is made as the strain-causing portion 22 and strain gauge 24-39 are stuck at the same position on the front side and back side thereof while strain gauges 40-55 at a position in the grooves 6 and 8 respectively. The gauges 24-55 form a bridge circuit to detect forces and moments in the X, Y and Z axes and as the tire 14 rotates, six vectors are measured each time a pulse is generated from a pulse detector within a slip ring 56.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for measuring six component forces acting on a road surface point of a wheel in order to measure the running performance of various types of automobiles.

Conventionally, some measuring devices as described above measure six component forces by modifying the wheel portion of a vehicle and installing a multi-force load cell in the brake drum portion. However, in this measuring device, since the multi-force load cell is fixedly provided by placing a bearing between the multi-force load cell and the wheel, the vehicle must be modified, which is inconvenient. Furthermore, when mounted on a driving vehicle, accurate measurements cannot be made due to interference from driving torque.

An object of the present invention is to provide a driving performance measuring device that solves each of the above-mentioned problems.

Therefore, the driving performance measurement unit according to the present invention is provided with a fixed part attached to the wheel attachment part of the vehicle in the center, a movable part attached to the wheel around the outer periphery of this fixed part, and a connection between the fixed part and the movable part. A strain-generating portion is provided at the boundary of the strain-generating portion, and a 7 train gauge is attached to this strain-generating portion.

With this configuration, the fixed part can be attached to the wheel mounting part, and the movable part can be attached to the wheel, so that the measuring device itself rotates together with the wheel part.

Therefore, there is no need to modify the vehicle and there is no interference from drive torque.

Hereinafter, the present invention will be explained in detail based on one embodiment shown in the drawings. As shown in FIG. 1, this measuring device is formed of a generally disk-shaped strain elastic body, has a fixed part 2 in its center, and has a 5I moving part 4 around this fixed part 2. . The fixed part 2 and the movable part 4 are separated by U-shaped and inverted U-shaped through grooves 6 and 8. Bolt holes 10 for mounting wheels are bored in the movable part 4 surrounded by each U-shaped through groove 6, and tires 14 are mounted using these bolt holes 1o and holes 1-12. . Similarly, bolt holes 16 for mounting the wheel drive unit are bored in the fixed part 2 surrounded by each inverted U-shaped through groove 8, and the bolt holes 16 and bolts 18 are used to attach the wheel mounting flange 20. installed.

As shown in FIG.
(right side in FIG. 2) is slightly recessed than the movable part 4. This is to prevent the rim 14a of the tire 14 from coming into contact with the fixed part 2 when the tire 14 is attached. On the contrary, the fixed part 2 protrudes beyond the movable part 4 on its back side (left side in FIG. 2). When this is installed on the 1 wheel mounting flange 20, the flange 20 is attached to the movable part 4.
The thinnest parts at the boundaries between the U-shaped and inverted U-shaped through grooves 6S8, which are used to prevent contact with the O. 16 strain gauges 24 at the same location
39 are pasted, and the U-shape and inverted U-shape of this strain-generating portion 22
Strain gauges 40 to 55 are attached to portions located within the letter-shaped through grooves 6.8.

These strain gauges 24 to 55 are
A bridge circuit is configured as shown in FIGS. 3 to 8 to detect force and moment in the z-axis direction, and the output end of each bridge is connected to a slip ring section 56 provided on the fixed section 2. ing. The slip ring section 56 is also provided with a pulse detector that generates a pulse every time the tire 14 rotates once. Note that since one strain gauge is shared for force and moment detection, a separation circuit is also provided, although not shown in the λ diagram.

When one tire 14 rotates, the measuring device configured in this manner rotates together with the tire 14, and each time the pulse detector generates a pulse, it reads the output signal of each bridge and measures 16 component forces.

In the above embodiment, one strain gauge is shared for force detection and moment detection, but separate strain gauges may be provided for each.Also, a wireless signal transmission method may be used instead of the slip ring 56. Good too.

[Brief explanation of the drawing]

Fig. 1 is a front view of one embodiment of the driving performance measuring device according to the present invention, Fig. 2 is a sectional view taken along line A-A in Fig. 1, and Fig.
The figure is a circuit diagram of a bridge for detecting force around the X-axis in the same embodiment, and Figure 4 is a circuit diagram of a bridge for detecting force around the y-axis in the same embodiment. Circuit diagram of the force detection bridge - Figure 6 is a circuit diagram of the bridge for moment detection around the X-axis of the same embodiment, and Figure 7 is a circuit diagram of the bridge for moment detection around the y-axis of the same embodiment. The figure is a circuit diagram of a bridge for moment detection around two axes in the same embodiment. 2... Fixed part, 4... Movable part ~ 22... Strain-generating part 1
24 to 55...Strain gauge. Patent applicant Yamato Seiko Co., Ltd. Representative Tetsu Shimizu and 2 others

Claims (1)

[Claims] [11 A fixing part that is attached to the wheel attachment part of the vehicle is provided in the center, and a HJ that is attached to the wheel is provided around the outer periphery of this fixing part.
This driving performance measuring device includes a moving part, a strain-generating part at the boundary between the fixed part and the movable part, and a nuttrain gauge attached to the strain-generating part.