JP2652177B2 - Tire rigidity measuring device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a tire stiffness measuring device, and more particularly, to measuring a tire's lateral stiffness, longitudinal stiffness, torsional stiffness, etc. with a single device. The present invention relates to a tire stiffness measuring device that is enabled.

(Prior art)

Generally, when evaluating the characteristics of a product tire, the tire is measured by measuring its lateral stiffness, longitudinal stiffness, torsional stiffness, and the like, and is used as a reference for designing a tire having excellent riding comfort and driving stability of an automobile.

By the way, as a conventional method for measuring the rigidity of a tire,
A steel band is held and fixed all around the tread of the pneumatic tire, and radial force (longitudinal force) and lateral force (lateral force) are applied to the rim of the installed tire.
And a torsional force were applied, and the rigidity (force) and displacement at this time were measured.

However, in the case of such a conventional measuring method, it is good to measure only when measuring tires of the same diameter with a steel band of the same dimensions, but if the tire diameter is different, replace the steel band. When measuring the rigidity of each tire, it is necessary to change the mounting position of the tire and the like, and there is a problem that much labor and time are required.

[Object of the invention]

The present invention has been devised in view of such a conventional problem, and its purpose is to set a tire to be measured once in an apparatus, without changing a tire mounting position or the like. An object of the present invention is to provide a tire stiffness measuring device capable of measuring the lateral stiffness, longitudinal stiffness, torsional stiffness and the like of a tire and easily measuring the stiffness even if the tire diameter is different.

[Configuration of the invention]

According to the present invention, to achieve the above object, a bed slidable along the slide rail is placed on a slide rail laid horizontally on a frame, and the bed is rotatable and cantilevered on the bed. The tire support shaft in the state is mounted, and a rotary drive device is connected to the rear end of the tire support shaft via detection means for measuring the torsional rigidity of the tire, and the rear end of the bed on which the tire support shaft is mounted Connected to a driving device equipped with a detecting means for measuring the lateral stiffness of the tire by moving the tire support shaft back and forth along the slide rail, and on one side of the frame, a tire mounted on the tire support shaft. Clamp means for clamping the outer peripheral surface is provided, and a driving device provided with a detecting means for measuring the longitudinal rigidity of the tire is connected to the clamp means, and the outer peripheral surface is supported by the tire support shaft. By applying the longitudinal force, lateral force and torsional force of the tire fixed respectively, the lateral rigidity, longitudinal rigidity, torsional rigidity, etc. of the tire can be measured with one set. The gist is that.

(Example of the invention)

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a front view of a stiffness measuring apparatus embodying the present invention, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is a side view of FIG. A horizontal slide rail 3 is laid on a frame 2 constructed on a machine base 1 as described above, and a bearing 3a is mounted on the slide rail 3.
A bed 5 on which the tire support shaft 4 is horizontally installed is slidably mounted.

The bed 5 supporting the tire support shaft 4 is connected to a driving device 6 for measuring the lateral stiffness of the tire W attached to the side of the frame 2 via a detecting means 7 such as a load cell. Is connected to an operating rod 8 which is horizontally protruded and retracted by the rotation of a drive motor 6a, and a rear end of the bed 5 is connected to a distal end of the operating rod 8 via the detection means 7 and a bracket 9. 10a, 10
b, is a limit switch for detecting the moving distance of the bed 5.

Next, the tire support shaft 4 installed on the bed 5 is installed horizontally via a bearing or the like, and the rear end of the tire support shaft 4 is provided with a detecting means for measuring coupling and torsional rigidity.
It is connected to a rotary drive 12 via 11.

As shown in FIGS. 2 and 3, the rotation drive device 12 is mounted on the rear end of the support shaft 4 via a drive motor 13 capable of normal and reverse rotation and a driving force transmission mechanism 14 such as a sprocket and a chain. It is connected. A pneumatic tire W with a rim is attached to the tip of the tire support shaft 4 in a cantilevered state.

Further, a clamp means 15 for clamping an outer peripheral surface of the tire W attached to the tire support shaft 4 is provided at a tip portion of the tire support shaft 4, and a detecting means for measuring the longitudinal rigidity of the tire W is provided on the clamp means 15. Drive 17 with means 16
Is connected.

As shown in FIGS. 1 and 3, the clamp means 15 has a vertically movable bed 20 mounted on a side surface of a vertical frame 18 via a slide rail 19, and a disk-shaped tire support on the bed 20. Plate 21 is mounted.

On the tire support plate 21, a plurality (12 in this embodiment) of tire holding plates 22 for clamping a tread portion of the tire W from an outer peripheral direction are radially arranged,
Each of the tire holding plates 22 is configured to expand and contract in the center direction and the outer peripheral direction of the tire support plate 21 in synchronization with the driving of the drive motor 23. That is, when the drive motor 23 is driven to rotate, the respective tire holding plates 22 expand and contract in the center direction and the outer peripheral direction of the tire support plate 21 via a gear mechanism (not shown) and the outer periphery of the tire W mounted on the tire support shaft 4. It is configured to clamp a surface.

24a and 24b are limit switches for detecting the moving distance of the bed 20.

A support member 25 is integrally attached to the upper end of the bed 20 which can be moved up and down via the slide rail 19, and the support member 25 includes a detection unit 16 for measuring the longitudinal rigidity of the tire W described above. Drive device 17 is connected.

The driving device 17 has a driving motor 27 on an upper frame 26.
The output shaft 28 of the drive motor 27 is connected to an elevating device 30 connected to the support member 25 via a transmission mechanism 29.

Therefore, when the drive motor 27 is driven to rotate, the lifting device 30
The bed 20 with the support member 25 integrated therewith rises and descends along the slide rail 19, and at the same time, applies force to the tire W held by the clamping means 15 in the vertical direction, by the detecting means 16, The longitudinal rigidity of the tire W is measured.

As described above, according to the present invention, one device is provided with a device for measuring the lateral stiffness, longitudinal stiffness, torsional stiffness, and the like of the tire, and is capable of being easily expanded and contracted even if the tire W has a different diameter. By providing the simple clamping means 15, the rigidity of the tire W can be easily measured.

 Next, a method for measuring the rigidity of the tire W will be described.

First, a rim-equipped pneumatic tire W is attached to the tip of a tire support shaft 4 that is rotatably and horizontally movable, and the outer peripheral surface of the tire W is clamped and fixed by a clamping means 15. . In such a state, for example, when the lateral rigidity and the displacement of the tire W are to be measured, the tire support shaft 4 is attached to the clamped tire W.
Is moved back and forth in the horizontal direction by the driving device 6, and the rigidity and displacement at this time are detected by the detecting means 7 to measure the lateral rigidity and displacement of the tire W.

Next, when the torsional rigidity of the tire W is measured, the torsional rigidity and displacement of the tire W are detected by the detecting means 11 by rotating the tire support shaft 4 in the left and right directions at a fixed time interval by the rotation driving device 12. Is measured. When the longitudinal rigidity and displacement of the tire W are further measured, the tire W supported on the tire support shaft 4 and whose outer peripheral surface is clamped by the clamp 15 is clamped by the driving device 17 through the clamping device 15. The vertical stiffness and the displacement of the tire W can be measured by the detecting means 16 by applying a force in the vertical direction, and the stiffness and the displacement can be determined to evaluate a product tire or the like. It is intended to be a reference in tire design.

As described above, the measurement of the rigidity of the tire W is performed by setting the tire W to be measured once in the apparatus and automatically measuring the lateral rigidity, the longitudinal rigidity, the torsional rigidity, etc. of the tire without changing the mounting position of the tire. The rigidity can be easily measured without changing parts or the like even if the tire W has a different diameter.

〔The invention's effect〕

According to the present invention, a bed (5) slidable along the slide rail (3) is placed on the slide rail (3) laid horizontally on the frame (2) as described above. A detection means (11) for mounting a rotatable and cantilevered tire support shaft (4) on a bed (5) and measuring the torsional rigidity of the tire at the rear end of the tire support shaft (4). A rotary drive unit (12) is connected via a, and the tire support shaft (4) is moved forward and backward along the slide rail (3) at the rear end of the bed (5) on which the tire support shaft (4) is mounted. A driving device (6) equipped with a detecting means (7) for measuring the lateral rigidity of the tire by moving it is connected, and a tire (W) attached to a tire support shaft (4) is mounted on one side of the frame (2). ) Is provided with a clamping means (15) for clamping the outer peripheral surface of Since the drive unit (17) equipped with the detection means (16) for measuring the longitudinal rigidity of the tire is connected, once the tire to be measured is set in the device, the tire can be mounted without changing the mounting position of the tire. It can measure the lateral stiffness, longitudinal stiffness, torsional stiffness, displacement, etc. of the tire, and has the effect that the stiffness can be easily measured even if the tire diameter is different. There is an effect that can be manufactured.

[Brief description of the drawings]

FIG. 1 is a front view of a rigidity measuring device embodying the present invention, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is a side view of FIG. 2 ... frame, 3 ... slide rail, tire support shaft, 6 ... drive device, 7 ... detection means, 11 ... detection means, 12 ... rotary drive device, 15 ... clamp means, 16 ...
Detecting means, 17: driving device, W: pneumatic tire.

Claims (1)

(57) [Claims] A bed (5) slidable along a slide rail (3) laid horizontally on a frame (2) is placed on the slide rail (3). )
Tire support shaft rotatable up and cantilevered (4)
Is mounted, and a rotation drive device (12) is connected to the rear end of the tire support shaft (4) via detection means (11) for measuring the torsional rigidity of the tire. A drive device (7) provided at the rear end of the bed (5) on which the tire is mounted with a detection means (7) for measuring the lateral rigidity of the tire by moving the tire support shaft (4) back and forth along the slide rail (3). 6), a clamp means (15) for clamping an outer peripheral surface of a tire (W) attached to a tire support shaft (4) is provided on one side of the frame (2).
A tire stiffness measuring device, characterized in that a driving device (17) provided with a detecting means (16) for measuring the longitudinal stiffness of the tire is connected to 5).