KR20150137465A - Tire Sidewall Stiffness Measurement Device - Google Patents

Abstract

The present invention provides a tire sidewall stiffness measurement device comprising: a tire fixation testing part wherein a tire is mounted in a horizontal direction to be transferred in a front and rear direction; a clamping part adhering to a thread of the tire on a center to lock the tire, wherein the tire is transferred by the tire fixation testing part; and a control unit to control the tire fixation testing part and the clamping part, and analyzing and outputting data measured during a test. Accordingly, the tire sidewall stiffness measurement device is capable of determining the characteristics and defects in a tire sidewall by horizontally clamping the tire thread, and separately measuring a stiffness of the tire sidewall; and integrally measuring a displacement and load in a direction (front and rear direction) vertical to a rotary shaft of the tire and vertical to a traveling direction of the tire, the displacement and load in the direction (vertical direction) of the rotary shaft of the tire, the rotational displacement angle and torque (rotational torque) around the rotary shaft of the tire, and a steering displacement angle and torque (steering torque) around a shaft vertical to the traveling direction of the tire and vertical to the rotary shaft of the tire using a single device without detaching the tire. As such, the measurement of stiffness of the tire sidewall can be simplified, thereby minimizing a testing period and costs.

Description

[0001] Tire Sidewall Stiffness Measurement Device [

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a tire side wall stiffness measuring apparatus, and more particularly, to a tire side wall stiffness measuring apparatus which measures tire stiffness by clamping a tire tread horizontally, The present invention relates to a tire side wall stiffness measuring device capable of measuring the stiffness of a tire side wall.

The tires support the load of the vehicle body in contact with the road surface, transmit the driving force of the engine to the road surface so that the vehicle can travel, and the braking force of the brakes is transmitted to the road surface to slow down the vehicle speed On the other hand, it is a vehicle component having many functions of relieving the impact applied to the vehicle body from the road surface during driving to improve ride comfort.

Such a tire includes a tread contacting the road surface constituting the outermost circumferential direction thereof, a side wall constituting a side surface of the tire, and a shoulder portion serving as a boundary portion between the tread and the side wall. While doing so, it performs a bending exercise.

Tires are subject to various damages depending on the road conditions at the time of driving the vehicle, and the tires may be damaged due to various causes such as cracks, abnormal wear, separation, shock rupture and the like. For example, treads or sidewalls constituting the exterior of the tire may be subjected to impact rupture by protrusions on the road, metal water, etc., and such tire damage may cause traffic accidents. Therefore, in order to cope with traffic accidents caused by tire damage, tire manufacturers conduct various tire tests by applying various parameters to tires.

Conventionally, by using a device for testing longitudinal stiffness, lateral stiffness, longitudinal stiffness, and torsional stiffness of the entire tire composed of the global stiffness, i.e., the tread and the sidewall, of the entire tire assembled to the wheel in a state in which the tire tread band is not constrained, , Which is a means for evaluating the characteristics of the tire, that is, the feeling of ride and steering stability.

As one example of this related technology, the present applicant has proposed a "tire universal testing device" as disclosed in Korean Patent No. 10-0860049 (hereinafter referred to as "Patent Document 1").

[Patent Document 1] Korean Patent No. 10-0860049 (tire universal testing apparatus)

Patent Document 1 discloses a tire universal testing apparatus capable of testing a tire with a single device in a vertical displacement and a load, a lateral displacement and a load, a displacement in a length (a traveling direction) and a load, One suggestion is that it is only possible to test each displacement / displacement angle and load / torque separately, and that two of the vertical, lateral, longitudinal (directional) and rotational (steering) The stiffness of the tire can not be measured in a situation where the above is simultaneously applied.

Further, as the vehicle design technique has advanced, it has become necessary to measure and analyze characteristics of the tire more finely. That is, it is necessary to separate and analyze the rigidity of the tire tread portion directly contacting the ground while directly contacting the ground while directly contacting the ground, and the rigidity of the tire sidewall portion which does not contact the ground but has a great influence on ride comfort.

In the case of the tread part, it is hardly destroyed by the impact because it includes the tread rubber and the steel belt layer. However, when there is an obstacle on the road surface or when traveling on a road surface having a different height such as a road curb, The sidewall is likely to be damaged.

Particularly, the high performance and ultra high performance tires are limited in the position of deformation caused by the load due to the low flatness ratio, and the vehicles in which the tire having a low flatness ratio is mainly installed are those capable of high speed running, and the vehicle movements such as sudden- The risk of cracking in the sidewalls is relatively higher than that of normal tires because it is directly transmitted to the moon, which is a serious risk to tire durability.

Therefore, it is necessary to determine the characteristics of the tire sidewalls and the presence or absence of defects by separately measuring the rigidity of the tire sidewalls.

It is a main object of the present invention derived from such a need to separate and measure only the rigidity of a tire sidewall by clamping the tire tread horizontally.

It is another object of the present invention to provide a method for measuring the rigidity of a tire sidewall by measuring a displacement and a load in a direction perpendicular to a tire rotation axis and in a direction perpendicular to a tire running direction (forward and backward directions), a displacement and a load in a tire rotation axis direction A rotational displacement angle and a torque (rotational torque) about a rotational axis, a steering displacement angle and a torque (steering torque) about an axis perpendicular to a tire rotational axis and perpendicular to a tire rotational direction, And to provide a tire side wall stiffness measuring device which can be tested comprehensively.

It is still another object of the present invention to provide a torque control device that is capable of detecting a load in a direction perpendicular to a tire rotation axis and perpendicular to a tire advancing direction (forward and backward directions), a load in a tire rotation axis direction (vertical direction) The stiffness of the tire sidewall can be measured in a situation in which at least one of a torque (steering torque) perpendicular to the tire rotation axis and an axis perpendicular to the tire running direction is simultaneously applied to the tire.

The present invention relates to a tire sidewall rigidity measuring apparatus for measuring the rigidity of a tire sidewall while horizontally mounting a tire, the tire sidewall rigidity measuring apparatus comprising: A clamping unit for clamping the tire by coming into close contact with the tread of the tire, And control means for controlling the tire fixing test portion and the clamping portion, and analyzing and outputting the measured data during the test.

Here, the tire fixing test portion may include: a center shaft to which the tire is fixedly mounted; A center axis transferring unit including a transfer plate having a central axis at an upper portion thereof and being transferred in a forward and backward direction; And a central axis rotating part provided on the transfer plate and rotating means installed to rotate the central axis, wherein a horizontal force, a vertical force, a rotary torque and a steering torque applied to the tire are measured A multi-axis force balance system can be installed.

Here, the clamping portion may include a frame portion including a base and a clamping device support portion for supporting the clamping device; The clamping device for restraining the tire by being in contact with the tread of the tire; A lifting unit for lifting the clamping device up and down; And a steering unit that rotates the clamping device about an axis passing through the center of the clamping device from the right and left sides of the clamping device.

Here, the clamping device may include: a main frame; A pressing portion including a plurality of constraining rotation ring connection shafts and a plurality of tightening plates; At least one constrained rotary ring to which said plurality of constrained rotary ring connection shafts are coupled around a circumference; And a restraint driving unit for rotating the restraint rotary ring in a circumferential direction, wherein the pair of base plates constituting the front and rear surfaces of the main body frame comprises: a tire insertion hole formed at a central portion; And a plurality of arcuate slots, wherein the constrained rotary ring transmits rotational force to the plurality of constrained rotation ring connection shafts so that the plurality of constrained rotation ring connection shafts simultaneously move in the circumferential direction.

Here, the plurality of constraining rotation ring connection shafts move in the circumferential direction in the plurality of arcuate slots in accordance with the circumferential rotation of the constraining rotation ring, so that the rotational force transmitted from the constraining rotation ring is transmitted to the plurality And the plurality of fastening plates may protrude inwardly in accordance with the circumferential movement of the plurality of constraining rotary ring connection shafts so as to come into close contact with or reenter the tread of the tire.

Here, the elevating unit includes a pair of elevating plates for elevating and lowering the clamping device, and the clamping device may be rotatably coupled between the pair of elevating plates.

The steering unit may include steering means provided on the lifting plate to rotate the clamping device about an axis passing through the center of the clamping device from the left and right sides of the clamping device.

The present invention has an effect that it is possible to judge the characteristics of the tire sidewall and whether or not there is a defect by measuring the rigidity of the tire sidewall separately by clamping the tire tread horizontally.

The displacement and load in the direction perpendicular to the tire rotation axis and in the direction perpendicular to the tire advancing direction (forward and backward directions), the displacement and the load in the tire rotation axis direction (up and down direction), the rotational displacement angle around the tire rotation axis, , The steering displacement angle and the torque (steering torque) about the axis perpendicular to the tire rotation axis and about the axis perpendicular to the tire running direction can be comprehensively measured through one device without separating the tire, So that the test period and cost can be minimized.

The load on the tire rotation axis direction (vertical direction), the torque (rotation torque) around the tire rotation axis, the load on the tire rotation axis in the direction perpendicular to the tire rotation axis By measuring the rigidity of the tire sidewall in a situation in which at least one of the torques (steering torque) around the axis perpendicular to the traveling direction is applied to the tire at the same time, It is possible to measure the rigidity of the tire sidewall in a situation where a load and a torque are applied to the tire.

1 is a perspective view of an apparatus for measuring the rigidity of a tire sidewall according to the present invention,
2 is a perspective view showing a tire fixing test portion on a base in the present invention,
Fig. 3 is a perspective view showing the transfer plate included in the central axis transferring portion of the tire fixing test portion of the present invention,
FIG. 4 is a perspective view showing a transport mechanism of a center axis transporting part of a tire fixing test part of the present invention,
5 is a perspective view showing a central axis rotating part of the tire fixing test part of the present invention,
6 is a perspective view showing the frame portion of the clamping portion of the present invention,
7 is a perspective view showing a clamping device of the clamping portion of the present invention,
8 is an exploded perspective view showing a pressing portion and a constraint driving portion of the clamping device according to FIG. 7,
9 is a perspective view showing a frame part and a lift part of the clamping part of the present invention,
10 is a perspective view showing the steering unit of the clamping unit of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, and the present invention is not limited to the embodiments.

The overall structure of the tire side wall stiffness measuring device 1 according to the present invention will be described below.

1 is a perspective view of an apparatus for measuring the rigidity of a tire sidewall according to the present invention.

Referring to FIG. 1, an apparatus 1 for measuring the rigidity of a tire sidewall according to the present invention includes a tire fixing test section 10, a clamping section 20, and a control means (not shown). As shown in the drawings, the present invention is different from a conventional tire stiffness tester in which a tire is vertically mounted and tested, and a tire side as a new device for measuring the rigidity of the tire side wall in a state in which the tire tread is horizontally clamped The present invention relates to a stiffness measuring device for a month.

Hereinafter, the configuration of the tire fixation testing unit 10 of the present invention will be described.

FIG. 2 is a perspective view showing a tire fixing test part on a base in the present invention, and FIG. 5 is a perspective view showing a central axis rotating part of the tire fixing test part of the present invention.

The tire fixing test portion 10 is so constructed that after a tire to be tested is rotatably mounted and the tire is conveyed and fixed so as to be located at the center portion of a clamping device 220 to be described later of the clamping portion 20, A load in a tire rotation axis direction (vertical direction), a torque around a tire rotation axis (a rotation torque), an axis perpendicular to a tire rotation axis, and an axis perpendicular to a tire running direction And includes a central axis 110, a central axis feed section 120, and a central axis rotation section 130. The center axis 110 is a part of the central axis 110,

2 and 5, the center shaft 110 is a fixed mount of a tire to be tested, and includes a central shaft support portion 112 on the transfer plate 121 of the central shaft transfer portion 120, And can be rotated together with the mounted tires, and is moved together in the forward and backward directions as the transfer plate 121 is transferred.

A multiaxial component force gauge 111 for measuring the horizontal force, the vertical force, the rotational torque and the steering torque applied to the tire is installed at the upper end of the central shaft 110. The tire to be tested is mounted on the multi- It is possible to measure the rigidity of the tire sidewall after the tire is mounted on the central shaft 110 and is transported and fixed so that the tire is positioned at the center of the clamping device 220, which will be described later, of the clamping portion 20. [

FIG. 3 is a perspective view showing a transfer plate included in a center axis transferring part of the tire fixing test part of the present invention, and FIG. 4 is a perspective view showing a transferring mechanism of a center axis transferring part of the tire fixing test part of the present invention.

3 and 4, the central axis feeder 120 is a part that moves the central axis 110 in the forward and backward directions and includes a feed plate 121, a feed screw 122, a feed guide rail 123 And a feed drive means 124. [

The transfer plate 121 is provided on the base 211 of the frame part 210 of the clamping part 20 to be described later so as to be movable forward and backward. On the transfer plate 121, a central shaft support part 112, And a center axis 110 is vertically installed on the center axis support part 122 and a cover for protecting the center axis 110 is provided.

4, the conveying screw 122 is provided in the base 211 of the frame part 210 and conveys the conveying plate 121 back and forth by the rotation thereof. One end of the conveying plate 121 is driven by a conveying drive And is rotated by receiving the rotational force, so that the transfer plate 121 is transferred on the base 211 in the forward and backward direction.

A transfer guide rail 123 provided between the transfer plate 121 and the base 211 for guiding the transfer of the transfer plate 121 is provided on both left and right sides of the transfer screw 121, 123 are preferably formed of an LM guide for the purpose of improving the transfer accuracy of the transfer plate 121 and the central shaft 110.

The transfer drive means 124 supplies rotational force for rotating the transfer screw 122 and is provided on the base 211 of the frame portion 210. According to the exemplary embodiment of the present invention, 124 are used as servo motors.

Here, when the rotary encoder is used together with the feed screw 122 while using the servomotor as the feed drive means 124, the rotary encoder generates a pulse every time the feed screw 122 rotates a certain angle . Therefore, the tire to be tested is fixedly mounted on the center shaft 110 via the multi-axis force gauge 111 and is fixed so as to be positioned at the center of the clamping device 220, which will be described later, of the clamping portion 20 , The number of pulses generated from the rotary encoder and the number of pulses generated by the revolution of the feed screw 122 in the forward and backward directions of the tire when the load is applied perpendicularly to the tire rotation axis and in a direction perpendicular to the tire advancing direction The displacement can be easily calculated.

In the above description, the central axis conveying unit 120 includes the conveying screw 122 and the conveying driving unit 124. However, the present invention is not limited thereto, and may include a rack, a pinion, a belt, a timing belt, It is also included in the present invention to move the conveying plate 121 in the forward and backward directions by using a chain, a rope driving device, a gear, or the like.

The central axis rotation unit 130 includes a rotation unit 131 provided on the transfer plate 121 for rotating the center axis 110. The center axis rotation unit 130 includes: The tire is fixed to the center shaft 110 so as to be rotatable together with the central shaft 110 and fixed to the clamping device 220 to be described later of the clamping portion 20 so as not to be rotatable The tire to be tested is transported and fixed so that the tire is mounted on the central shaft 110 via the multi-axis force integrator 111 and the tire is located at the center of the clamping device 220, which will be described later, of the clamping portion 20 By applying the torque (rotation torque) about the tire rotation axis by the rotation means 131, it becomes possible to measure the rotation rigidity of the tire side wall.

The rotating means 131 is provided on the conveying plate 121 to supply a rotational force for rotating the central shaft 110 together with the fixedly mounted tires. According to an exemplary embodiment of the present invention, 131 are used as servo motors.

Here, when a rotary encoder is installed together with the central shaft 110 while using the servo motor as the rotating means 131, the rotary encoder generates a pulse every time the central shaft 110 rotates a predetermined angle do. Therefore, when the torque (rotation torque) around the tire rotation axis is applied to the central axis 110 for the rigidity test of the tire sidewall, the rotation displacement angle of the tire is made easy by using the number of pulses generated from the rotary encoder And the like.

Hereinafter, the configuration of the clamping unit 20 of the present invention will be described.

The clamping portion 20 is brought into close contact with the tread of the tire which is fed by the tire fixing test portion 10 and is disposed at the center portion so as to restrain the tire, and the load applied to the tire in the tire rotation axis direction (vertical direction) and / (Steering torque) about an axis perpendicular to the tire advancing direction to the tire and includes a frame portion 210, a clamping device 220, a lift portion 230 and a steering portion 240 .

6 is a perspective view showing the frame portion of the clamping portion of the present invention.

The frame part 210 is a skeleton of the tire side wall stiffness measuring device 1 of the present invention and includes a base 211 and a clamping device supporting part 212.

Referring to FIG. 6, the base 211 has a bottom and a central axis feed part 120 is installed at the central part in the forward and backward directions. The clamping device support part 212 includes a part supporting the clamping device 220 And a pair of vertical frames 212a projecting upward from both sides of the base 211. [

FIG. 7 is a perspective view showing a clamping device of a clamping part of the present invention, and FIG. 8 is an exploded perspective view showing a pressing part and a constraining driving part of the clamping device according to FIG.

The clamping device 220 is a portion which is transferred by the tire fixing test portion 10 and is brought into tight contact with the tread of the tire disposed at the center portion to thereby restrain the tire. The pressing portion 221, the constraining rotation ring 222, (223).

The pressing portion 221 includes a main body frame 2211, a plurality of constraining rotation ring connection shafts 2212 and a plurality of tightening plates 2213. The pressing portion 221 is conveyed by the tire fixing test portion 10, And functions to closely adhere a plurality of tightening plates 2213 to the tread of the tire to be disposed.

7 and 8, the main body frame 2211 is a skeleton of the clamping device 220. The main frame 2211 includes a pair of bases constituting the front and rear surfaces in a state in which the clamping devices 220 are vertically arranged, And a plurality of U-shaped support pieces provided between the pair of base plates and coupling the pair of base plates.

According to an exemplary embodiment of the present invention, each of the pair of base plates has an octagonal outer periphery, a tire insertion hole 2211a at the center, and a plurality of arcuate long holes 2211b. Further, according to an exemplary embodiment of the present invention, a plurality of U-shaped support pieces are provided between a pair of base plates, respectively, at a central portion of each side of the outer periphery of the octagon of the pair of base plates, Lt; / RTI >

Here, the pair of base plates has been described as having an octagonal ring shape, but the present invention is not necessarily limited thereto. The pair of base plates may have a polygonal shape or a circular shape It can have the form of a ring.

The plurality of constrained rotating ring connection shafts 2212 are coupled to the constrained rotating ring 222 and move in the circumferential direction within the arcuate slots 2211b of the pair of base plates in accordance with the circumferential movement of the constrained rotating ring 222 And transmits the rotational force transmitted from the constraining rotation ring 222 to the plurality of tightening plates 2213 through the link portion to function to cause the plurality of tightening plates 2213 to come into close contact with the tread of the tire.

The plurality of tightening plates 2213 are parts of tight contact with the tread of the tire which is fed by the tire fixing test section 10 and arranged at the center, Or protrude into the central portion of the device 220. FIG. According to the exemplary embodiment of the present invention, each of the contact plates 2213 is formed in a circular arc shape in close contact with the tread of the tire. However, the present invention is not limited to this, Plane or the like.

Referring to FIG. 7, the constraining rotation ring 222 transmits rotation force to a plurality of constraining rotation ring connection shafts 2212 so that a plurality of constraint rotation ring connection shafts 2212 simultaneously move in the circumferential direction, At least one parallel plate is formed parallel to the base plate constituting the front and rear surfaces of the fixing plate 2211. Referring to FIG. 8, a plurality of constraining rotation ring connection shafts 2212 are coupled around the circumference.

According to the exemplary embodiment of the present invention, two constraining rotation rings 222 are provided on the front and rear sides of a pair of base plates of the body frame 2211 in parallel with the base plate, And the connection shaft 2212 is interposed therebetween to connect the two constraining rotation rings 222. [ A connecting piece 222a may be provided on the upper and lower portions of the two constraining rotation rings 222 to connect the two constraining rotation rings 222 to each other.

The clamping device 220 is provided with a plurality of clamping devices 220 protruding and supported from the base plate of the main frame 2211 and supporting the inner side surface of the constraining rotation ring 222 in the center of the tire, A roller 224 of a roller 224 is provided.

The restraint driving unit 223 is provided in the main body frame 2211 and supplies a force for moving the constraining rotating ring 222 in the circumferential direction. According to the exemplary embodiment of the present invention, And a drive screw rotated by the geared motor. The connecting piece 222a is moved left and right by the rotation of the driving screw, so that the constraining rotating ring 222a, which is coupled to the connecting piece 222a, So that the rotor 222 is rotated in the circumferential direction.

9 is a perspective view showing a frame part and a lift part of the clamping part of the present invention.

The elevating portion 230 functions to elevate the clamping device 220 up and down and includes a pair of elevating plates 231, elevating screws 232, elevating guide rails 233 and elevating and lowering driving means 234, .

The pair of lifting plates 231 are rotatably fixed to the clamping device 220 and are coupled to the left and right of the clamping device 220. The lifting guide rails 233 are inserted into the vertical frame 212a, Respectively.

According to the exemplary embodiment of the present invention, the two lift screws 232 are provided on the pair of vertical frames 212a so as to be vertical to the vertical frames 212a, As shown in FIG.

An elevating guide rail 233 for guiding the elevating plate 231 up and down is provided between the vertical frame 212a and the elevating plate 231. The elevating guide rail 233 is provided between the vertical frame 212a and the elevating plate 231, It is preferable that it is constituted by an LM guide for improvement.

The lifting and lowering drive means 234 is provided in the clamping device support portion 212 for supplying rotational force for rotating the lifting screw 232. According to an exemplary embodiment of the present invention, the lifting and driving means 234 includes a servo motor installed at the upper center of the upper frame 212b connecting the pair of vertical frames 212a, And a gear and a gear for transmitting the lift screw 232 to the vertical frame 212a. At this time, the gear may be a bevel gear or a worm gear.

Here, when the rotary encoder is installed together with the lift screw 232, the rotary encoder generates a pulse every time the lift screw 232 rotates a certain angle. Therefore, the tire to be tested is mounted on the central shaft 110 via the multi-axis force gauge 111 and is transported and fixed so that the tire is positioned at the center of the clamping device 220, which will be described later, of the clamping portion 20, When the load in the tire rotation axis direction (vertical direction) is applied, the number of pulses generated from the rotary encoder and the condition for easily calculating the displacement in the vertical direction of the tire using the lead per revolution of the lifting screw 232 .

Although the lift 230 is described as including the lifting screw 232 and the lifting drive unit 234 in the above description, the present invention is not limited to this, and may include a rack, a pinion, a belt, a timing belt, , The rope driving device, the gear, or the like to raise and lower the lifting plate 231 up and down.

10 is a perspective view showing the steering unit of the clamping unit of the present invention.

The steering unit 240 functions to rotate the clamping device 220 about the axis passing through the center of the clamping device 220 on the left and right sides of the clamping device 220, do.

The steering means 241 is provided on the lifting plate 231 to supply the rotating force for rotating the clamping device 220. According to an exemplary embodiment of the present invention, .

Here, when a rotary encoder is installed together with the steering shaft 225 of the clamping device 220 while using the servomotor as the steering means 241, the rotary encoder generates a pulse every time the rotary shaft rotates a predetermined angle . Therefore, the tire to be tested is fixedly mounted on the center shaft 110 via the multi-axis force gauge 111 and is fixed so as to be positioned at the center of the clamping device 220, which will be described later, of the clamping portion 20 (Steering torque) about an axis perpendicular to the tire rotation axis and perpendicular to the tire advancing direction is applied, the number of pulses generated from the rotary encoder is used to calculate the center of the axis perpendicular to the tire rotation axis A condition that the steering displacement angle of the clamping device 220 can be easily calculated.

Hereinafter, the operation sequence of the tire side wall stiffness measuring apparatus 1 according to the present invention will be described.

First, in the initial state as shown in Fig. 1, the tire to be tested is fixedly mounted on the central axis 110 of the tire fixation test section 10. Fig.

The central axis transferring part 120 of the tire fixing test part 10 is operated to move the transfer plate 121 to the clamping device 220 of the clamping part 20 To the installed position. Accordingly, the center shaft support portion 112, the central shaft rotation portion 130, the center shaft 110, and the tires fixedly mounted on the center shaft 110 mounted on the transfer plate 121 are also transported.

At this time, the clamping device 220 supported by the vertical frame 212a is lowered from the upper portion to the height at which the tire is mounted by the elevating portion 230, As shown in Fig.

Thereafter, the plurality of tightening plates 2213 protrude to the central portion of the clamping device 220 by the constraining driving portion 223 of the clamping device 220, thereby being brought into close contact with the tread of the tire.

In this ready state, the load in the direction perpendicular to the tire rotation axis and in the direction perpendicular to the tire running direction (forward and backward directions) measured from the multi-axis force integrator 111 interposed between the tire and the center shaft 110, (Rotation torque) around the tire rotation axis, the torque (steering torque) about the axis perpendicular to the tire rotation axis and about the axis perpendicular to the tire rotation axis becomes zero, and then the rigidity of the tire side wall .

In the case of testing the displacement and the load in the direction perpendicular to the tire rotation axis of the tire sidewall in the ready state and in the direction perpendicular to the tire running direction (forward and backward directions), the feed drive means 124 of the central axis feeder 120 is operated, A load in the forward and backward direction is applied to the load. At this time, the number of pulses generated from the rotary encoder provided together with the transport screw 122, the forward and backward displacements calculated using the lead per unit revolution of the transport screw 122, The In-plane Vertical Spring Rate (IVSR) value can be obtained by calculating the ratio of the forward and backward loads measured from the multi-axis force integrator 111. [

When the displacement and the load in the tire rotation axis direction (vertical direction) are tested in the ready state, the elevation driving means 234 of the elevation portion 230 is operated to apply a load to the tire in the vertical direction. At this time, the number of pulses generated from the rotary encoder provided together with the lift screw 232, the vertical displacement calculated by using the lead per unit revolution of the lift screw 232, The out-plane lateral spring rate (OLSR) value can be obtained by calculating the ratio of the vertical load measured from the multi-axial component force gage 111. [

In testing the rotational displacement angle and the torque (rotation torque) about the tire rotation axis in the ready state, the rotation means 131 of the central axis rotation portion 130 is operated to apply the rotation torque to the tire. At this time, the rotational displacement angle of the tire calculated by using the number of pulses generated from the rotary encoder provided together with the central axis 110 and the rotation angle measured from the multi-axis partial force integrator 111 interposed between the tire and the center shaft 110 The in-plane torque spring rate (ITSR) value can be obtained by calculating the torque ratio.

When the steering displacement angle and the torque (steering torque) about the axis perpendicular to the tire rotational axis and perpendicular to the tire running direction are tested in the ready state, the steering means 241 of the steering unit 240 is operated, Torque is applied. At this time, the steering displacement angle of the tire calculated using the number of pulses generated from the rotary encoder provided together with the steering shaft 225 of the clamping device 220, and the angle of inclination of the multi- 111), thereby obtaining an Out-plane Rotational Spring Rate (ORSR) value.

As described above, the apparatus for measuring the rigidity of the tire sidewall according to the present invention has an advantage that the characteristics of the tire sidewall and the presence or absence of defects can be judged by measuring the rigidity of the tire sidewall alone by clamping the tire tread horizontally have.

The displacement and load in the direction perpendicular to the tire rotation axis and in the direction perpendicular to the tire advancing direction (forward and backward directions), the displacement and the load in the tire rotation axis direction (up and down direction), the rotational displacement angle around the tire rotation axis, , The steering displacement angle and the torque (steering torque) about the axis perpendicular to the tire rotation axis and about the axis perpendicular to the tire running direction can be comprehensively measured through one device without separating the tire, So that the test period and cost can be minimized.

The load on the tire rotation axis direction (vertical direction), the torque (rotation torque) around the tire rotation axis, the load on the tire rotation axis in the direction perpendicular to the tire rotation axis By measuring the rigidity of the tire sidewall in a situation in which at least one of the torques (steering torque) around the axis perpendicular to the traveling direction is applied to the tire at the same time, There is an advantage that the rigidity of the tire sidewall can be measured in a situation where a load and a torque are applied to the tire.

That is, in the ready state, the feed drive unit 124 of the central axis feed unit 120, the elevation drive unit 234 of the elevation unit 230, the rotation unit 131 of the central axis rotation unit 130, , It is possible to measure the rigidity of the tire sidewall in a situation where various loads and torques similar to those actually applied to the tire during running of the vehicle are applied to the tire will be.

The features, structures, effects and the like described in the above embodiments are included in at least one embodiment of the present invention, and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects and the like illustrated in the embodiments can be combined and modified by other persons skilled in the art to which the embodiments belong. Therefore, it should be understood that the present invention is not limited to these combinations and modifications.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. It will be appreciated that many variations and applications not illustrated are possible. That is, each component specifically shown in the embodiments can be modified and implemented. It is to be understood that all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

1: Rigidity measuring device of tire side wall
10: Tire fixing test section
110: central axis 120: central axis feed section
121: Feed plate 122: Feed screw
123: conveying guide rail 124: conveying driving means
130: center shaft rotation part 131: rotation means
20: clamping part
210: frame part 211: base
212: clamping device support part 212a: vertical frame
220: Clamping device 221:
2211: Clamping device base plate 2211a: Tire insert ball
2211b: Circular arc hole 2212: Constraining rotation ring connection axis
2213: Clamp plate
222: constrained rotating ring 223:
230: elevating part 231:
232: lift screw 233: lift guide rail
234:
240: Steering section 241: Steering means

Claims (7)

A tire fixing test portion 10 in which a tire is mounted horizontally and is transported in the forward and backward directions;
A clamping part 20 which is transferred by the tire fixing test part 10 and is in close contact with the tread of the tire disposed at the center so as to restrain the tire; And
And control means for controlling the tire fixing test portion (10) and the clamping portion (20), and analyzing and outputting the measured data during the test process.
The method according to claim 1,
The tire fixing test section (10)
A central shaft (110) to which the tire is fixedly mounted;
A central axis transferring part 120 having a central axis 110 on the upper part thereof and including a transfer plate 121 which is transferred in the forward and backward directions; And
And a central axis rotation unit 130 provided on the transfer plate 121 and including a rotation unit 131 installed to rotate the center axis 110,
And a multiaxial force integrator (111) capable of measuring a horizontal force, a vertical force, a rotation torque, and a steering torque applied to the tire is installed on the center shaft (110).
3. The method of claim 2,
The clamping part (20)
A frame portion 210 including a base 211 and a clamping device support portion 212 for supporting the clamping device 220;
A clamping device (220) for restraining the tire by being in contact with the tread of the tire;
A lifting part (230) for lifting the clamping device (220) up and down; And
And a steering unit (240) for rotating the clamping device (220) about the axis passing through the center of the clamping device (220) from the right and left sides of the clamping device (220).
The method of claim 3,
The clamping device 220 includes a body frame 2211; A pressing portion 221 including a plurality of constraining rotary ring connection shafts 2212 and a plurality of contact plates 2213; At least one constraining rotation ring (222) to which said plurality of constraining rotation ring connection shafts (2212) are coupled around a circumference; And a restraint driving unit (223) for rotating the constraining rotation ring (222) in the circumferential direction,
The pair of base plates constituting the front and rear surfaces of the main body frame 2211 includes a tire insertion hole 2211a formed at the center portion; And a plurality of arcuate slots 2211b,
The constraining rotation ring 222 transmits a rotation force to the plurality of constraining rotation ring connection shafts 2212 to make the constraint rotation ring connection shafts 2212 simultaneously move in the circumferential direction. Device.
5. The method of claim 4,
The plurality of constraining rotation ring connection shafts 2212 are moved in the circumferential direction within the plurality of arcuate elongated holes 2211b in accordance with the circumferential rotation of the constrained rotation ring 222, To the plurality of tightening plates (2213) through the link portion,
Wherein the plurality of tightening plates (2213) protrude inward in accordance with the circumferential movement of the plurality of constraining rotary-ring connecting shafts (2212) and come into close contact with or reenter the tread of the tire.
6. The method of claim 5,
The elevating part 230 includes a pair of elevating plates 231 for vertically moving the clamping device 220,
And the clamping device (220) is rotatably coupled between the pair of lift plates (231).
The method according to claim 6,
The steering unit 240 is installed on the lifting plate 231 so as to rotate the clamping device 220 about the axis passing through the center of the clamping device 220 from the left and right sides of the clamping device 220 (241) which is formed in the tire side wall.

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