JPS6342341Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a test device for measuring the input/output characteristics of a rack-and-pinion type steering device.

<Prior art> In a conventional test device for measuring the input/output characteristics of a rack-and-pinion type steering device, a load meter is installed on the axis of the steering rack via a coil spring, and the spring force due to sliding of the steering rack is measured. Changes are detected by a load meter and the steering output is measured.

However, in an actual vehicle, the tie rod tilts due to the rotation of the knuckle arm due to sliding of the steering rack, and a component force (bending force) in the radial direction is applied to the steering rack according to the angle of inclination of the tie rod. When measuring on the axis of the steering rack, there was a problem in that the actual steering force could not be measured.

<Purpose of the invention> The purpose of the invention is to make it possible to measure the steering output with high precision, and to make it possible to easily change the setup when changing the load.

<Structure of the invention> In order to achieve the above object, the present invention supports the main body of a rack-and-pinion type steering system on a test stand, and has ball joints at both ends of the steering rack that is slidably fitted into the main body. The knuckle arms are connected to each other via tie rods, these knuckle arms are rotatably supported on the test stand, and a flexible thin-walled cylindrical member is fixed on the axis of rotation of each of the knuckle arms, and this thin-walled cylindrical member and A torsion bar for absorbing the load transmitted to the knuckle arm is provided concentrically, one end of the torsion bar is integrally connected to the thin cylindrical member, the other end is integrally connected to the test stand, and the knuckle arm is connected to the thin cylindrical member. A strain gauge is attached to measure the transmitted load.

<Example> Hereinafter, an example of the present invention will be described based on the drawings. In FIG. 1, 10 is a power cylinder 11
The main body 10 is supported at both ends by support stands 13 and 14 installed on a test stand 12. A steering rack 16 having rack teeth 15 is slidably fitted into the main body 10, and a piston of a power cylinder 11 is connected to the steering rack 16. The main body 10 has the above-mentioned latch teeth 1.
A pinion shaft meshing with 5 is rotatably supported,
The steering shaft 1 is connected to this pinion shaft via a servo valve device.
7 are connected. Then, the power cylinder 1 is activated by the operation of the servo valve device by the rotation of the steering shaft 17.
1 is supplied with pressure oil, and the steering rack 16 is slid.

Tie rods 2 are connected to both ends of the steering rack 16 via ball joints 21 and 22.
3 and 24 are connected to each other, and one ends of knuckle arms 25 and 26 are pivotally connected to these tie rods 23 and 24, respectively. As shown in FIG. 2, the knuckle arms 25 and 26 are rotatably supported on a fixed shaft 27 installed on the test stand 12 in a plane parallel to the sliding direction of the steering rack 16. One end of a flexible thin cylindrical member 28 is fixed to the knuckle arms 25 and 26 concentrically with the rotation center thereof, and a spline sleeve 29 is fixed to the other end of this thin cylindrical member 28. One end of a load-absorbing torsion bar 30 inserted concentrically into the thin cylindrical member 28 is spline-engaged with the spline sleeve 29, and the other end of the torsion bar 30 is fixed to the fixed shaft 27.

A strain gauge 31 is attached to the thin-walled cylindrical member 28.
An electrical output proportional to the distortion induced in the steering wheel 8 is generated, and the steering output is measured based on this electrical output.

In the above-described configuration, when a rotational input is applied to the steering shaft 17, the servo valve device is operated, pressure oil is distributed to the power cylinder 11, and the steering rack 16 is slid. The axial thrust applied to the steering rack 16 applies rotational torque to the knuckle arms 25, 26 via the ball joints 21, 22 and tie rods 23, 24. The torsion bar 30 is twisted in accordance with this rotational torque to absorb the rotational torque, and a strain is generated in the thin cylindrical member 28 in accordance with the torsion torque of the torsion bar 30, and the strain gauge 3
1 generates an electrical output proportional to the rotational torque applied to the knuckle arms 25, 26. Thereby, the steering output relative to the rotational input applied to the steering shaft 17 can be measured. At this time, the rotation of the knuckle arms 25, 26 causes the tie rods 24, 24 to
Since the steering rack 16 is inclined with respect to the axis of the steering rack 16, the steering output is measured while applying a force in the radial direction to the steering rack 16 according to the angle of inclination θ, so that measurements can be made in accordance with the actual vehicle. obtain. Furthermore, since the strain gauge 31 that measures the steering output is attached to the thin-walled cylindrical member 28, even when performing tests with various loads on the knuckle arms 25 and 26, the torsion bar 31
It is only necessary to change the spring constant to one with a different spring constant, and setup changes can be easily performed.

In the above embodiment, an example was described in which the input/output characteristics of a power steering device were measured, but it goes without saying that the present invention can also be applied to testing of a manual type rack and pinion type steering device.

<Effects of the invention> As described above, in the present invention, the knuckle arms are connected to both ends of the steering rack via ball joints and tie rods, and the rotational torque applied to the knuckle arms is absorbed by the torsion of the torsion bars. At the same time, the strain gauge is configured to detect the strain generated in the thin cylindrical member in response to the torsion of the torsion bar.
It becomes possible to measure the steering output, which has the effect of improving measurement accuracy.

Furthermore, changing the load on the knuckle arm only requires replacing the torsion bar, which has the effect of making setup changes easier.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a testing device for a steering device showing an embodiment of the present invention, and FIG. 2 is an enlarged sectional view taken along the line - in FIG. 10...Steering device main body, 12...Test stand, 16
... Steering rack, 17 ... Steering shaft, 2
1, 22... Ball joint, 23, 24...
Tie rod, 25, 26...Natsukuru arm, 2
8... Thin cylindrical member, 30... Torsion bar,
31...Strain gauge.

Claims (1)

[Scope of utility model claims] The main body of the rack-and-pinion type steering device is supported on a test stand, and the knuckle arms are connected to both ends of the steering rack slidably fitted to the main body via ball joints and tie rods. A flexible thin-walled cylindrical member is rotatably supported on the test table and fixed on the axis of rotation of each of the knuckle arms, and a flexible thin-walled cylindrical member is provided concentrically with the thin-walled cylindrical member for absorbing the load transmitted to the knuckle arms. A torsion bar is provided, one end of the torsion bar is integrally connected to the thin cylindrical member, the other end is integrally connected to the test stand, and a strain gauge is attached to the thin cylindrical member for measuring the load transmitted to the knuckle arm. A steering device testing device featuring: