JPH0319494B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for measuring six component forces acting on a road surface point of a wheel in order to measure the running performance of various 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, this measuring device has a structure in which the multi-force load cell is fixedly provided by disposing a bearing between the multi-force load cell and the wheel, which is inconvenient because the vehicle must be modified. Furthermore, when attached to a driving wheel, it was not possible to accurately measure the six component forces due to interference from the 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 present invention provides a fixing part attached to the wheel attachment part of a vehicle in the center, and the fixing part has fixing parts projecting outward at equal angles on a circumference drawn around the center of the fixing part. A movable part that is attached to the wheel of the vehicle is provided on the outer periphery of the fixed part on a concentric circle with the fixed part. A movable part-side protrusion protruding toward the fixed part is provided so as to be spaced apart from each other, and a strain-generating part is provided between the fixed part-side protrusion and the movable part-side protrusion to connect them. A strain gauge is attached to the strained part so as to be located on the same circumference.

With this configuration, the fixed part can be attached to the wheel mounting part of the vehicle, and the movable part can be attached to the wheel of the vehicle, so that the measuring device itself rotates together with the wheel. Therefore, six component forces can be measured without any modification of the vehicle. Further, since the movable part side protrusion and the fixed part side protrusion are located on the same circumference, this measuring device can be made smaller. In addition, since the protruding part on the movable part side, the protruding part on the fixed part side, and the strain generating part are located on the same circumference, unnecessary moments are not applied to the strain gauge, and six component forces can be accurately measured. can do.

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, and has a fixing part 2 in the center thereof.
It has a movable part 4 around it. Fixed part 2 and movable part 4
are separated by U-shaped and inverted U-shaped through grooves 6 and 8 arranged on a circumference centered on the center of the fixing part 2.

In the movable part 4, a portion surrounded by each U-shaped through groove 6 is a movable part side protrusion 4a,
These are located on a circumference centered on the center of the fixed part 2 at equal angle intervals. These protrusions 4
Bolt holes 10 for wheel attachment are drilled in a, and a tire 14 is attached to the movable part 4 using these bolt holes 10 and bolts 12.

Similarly, in the fixed part 2, the portion surrounded by each inverted U-shaped through groove 8 is the fixed part side protrusion 2.
a, and these are also located equiangularly apart from each other on the above-mentioned circumference centered on the center of the fixing part 2, and also equiangularly apart from each protruding part 4a. Bolt holes 16 for mounting the wheel drive unit are bored in this protrusion 2a, and these bolt holes 16 and bolts 18 are used to attach the wheel mounting flange 2.
A fixing part 2 is attached to 0.

As shown in FIG. 2, the fixed part 2 is recessed somewhat more than the movable part 4 on its front side (right side in FIG. 2). This is to prevent the rim 14a of the tire 14 from coming into contact with the fixed portion 2 when the tire 14 is mounted. On the other hand, the fixed part 2 is
It protrudes beyond the movable part 4 on its back side (left side in FIG. 2). This is the wheel mounting flange 20
This is to prevent the flange 20 from coming into contact with the movable part 4 when attached to the movable part 4.

The thinnest part at the boundary between the fixed parts 2a and 4a is the strain-generating part 22 that connects the fixed part 2 and the movable part 4.
16 at the same position on the front and back sides.
Strain gauges 24 to 39 are attached,
The U-shaped and inverted U-shaped through grooves 6 of this strain-generating portion 22,
Strain gauges 40 to 55 on the surface facing inside 8.
is pasted. These strain gauges 2
4 to 55 are located on the same circumference.

These strain gauges 24 to 55 are arranged on the x axis,
Bridge circuits are configured as shown in FIGS. 3 to 8 to detect forces in the y-axis and z-axis directions and moments around these axes, respectively, and the output end of each bridge is connected to the fixed part 2. It is connected to a slip ring portion 56 which has been provided. The slip ring section 56 is provided with a pulse detector that generates a pulse every time the tire 14 rotates once. Note that since the strain gauge is commonly used for force and moment detection, a separation circuit is also provided, although not shown.

With this configuration, the locating device rotates together with the tire 14 when it rotates, and each time the pulse detector generates a pulse, it reads the output signal of each bridge and measures the 6-component force.

In the above embodiment, the strain gauges are used for both force detection and moment detection, but strain gauges may be provided for exclusive use of each strain gauge. Further, instead of the slip ring section 56, a wireless signal transmission method may be adopted.

[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. 3 is a force detection around the x-axis of the same embodiment. 4 is a circuit diagram of the bridge for detecting force around the y-axis of the same embodiment. FIG. 5 is a circuit diagram of the bridge for detecting force around the z-axis of the same embodiment. FIG. 7 is a circuit diagram of the bridge for detecting moments about the x-axis, FIG. 8 is a circuit diagram of the bridge for detecting moments about the y-axis, and FIG. 8 is a circuit diagram of the bridge for detecting moments about the z-axis. 2... fixed part, 2a... fixed part side protrusion, 4...
...Movable part, 4a...Movable part side protrusion, 22...Strain generating part, 24 to 55...Strain gauge.

Claims (1)

[Claims] 1. A fixed part that is attached to the wheel mounting part of a vehicle is provided in the center, and the fixed part has protruding parts on the fixed part side that protrude outward at equal angles on a circumference that can be drawn around the center of the fixed part. A movable part is provided on the outer periphery of the fixed part and is attached to a wheel of the vehicle, and is concentric with the fixed part, and the movable part is located between the protruding parts on the fixed part side at an equal angle from these parts. A movable part side protrusion protruding toward the fixed part side is provided in the state, and a strain-generating part is provided between the fixed part side protrusion part and the movable part side protrusion part to connect them, and these strain-generating parts have a shape of the same circle. A running performance measurement device that consists of strain gauges attached to the circumference.