WO2005019791A1 - Method and apparatus for tire uniformity measurement - Google Patents
Method and apparatus for tire uniformity measurement Download PDFInfo
- Publication number
- WO2005019791A1 WO2005019791A1 PCT/JP2004/012597 JP2004012597W WO2005019791A1 WO 2005019791 A1 WO2005019791 A1 WO 2005019791A1 JP 2004012597 W JP2004012597 W JP 2004012597W WO 2005019791 A1 WO2005019791 A1 WO 2005019791A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- tire
- rotating drum
- force
- forces
- plane
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000005259 measurement Methods 0.000 title claims description 61
- 238000003825 pressing Methods 0.000 claims abstract description 82
- 238000005520 cutting process Methods 0.000 claims description 15
- 238000000691 measurement method Methods 0.000 claims description 10
- 230000003247 decreasing effect Effects 0.000 claims description 9
- 238000012360 testing method Methods 0.000 description 21
- 230000006870 function Effects 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 5
- 230000010355 oscillation Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 101100129500 Caenorhabditis elegans max-2 gene Proteins 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M1/00—Testing static or dynamic balance of machines or structures
- G01M1/30—Compensating imbalance
- G01M1/34—Compensating imbalance by removing material from the body to be tested, e.g. from the tread of tyres
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
- G01M17/02—Tyres
- G01M17/022—Tyres the tyre co-operating with rotatable rolls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C25/00—Apparatus or tools adapted for mounting, removing or inspecting tyres
- B60C25/002—Inspecting tyres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/0601—Vulcanising tyres; Vulcanising presses for tyres
- B29D30/0633—After-treatment specially adapted for vulcanising tyres
- B29D2030/0634—Measuring, calculating, correcting tyre uniformity, e.g. correcting RFV
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
- B60Y2304/00—Optimising design; Manufacturing; Testing
- B60Y2304/09—Testing or calibrating during manufacturing
Definitions
- a rotating drum which serves as a substitute for the road surface, presses against a rotatably held tire with a predetermined pressing force (several hundred kilograms) , or the tire is pressed against the rotating drum with the predetermined pressing force.
- the tire and the rotating drum are capable of rotating around their respective rotational axes, in such a way that when either one rotates, the other is also caused to rotate . In this condition, the tire or the rotating drum is rotatably driven so that the tire rotates at 60 [rpm] .
- the exciting force produced by nonuniformity of the tire occurs.
- This exciting force is measured by one or more means for measuring force (such as a load cell) mounted on a bearing which rotatably supports the tire or the rotating drum, or mounted on a member attached to this bearing. From the measured value, an index that serves to evaluate the nonuniformity of the tire is computed. This measurement is called as a uniformity measurement.
- the index obtained by means of this uniformity measurement is computed by modeling the tire as a disc (this model will be called as a "disc model” hereinafter) and assuming that the force is concentrated at the center of that disc.
- An aspect of the present invention relates to detect the fluctuation in the exciting force produced by nonuniformity in a tire lateral direction (i.e., a direction of the tire rotational axis) . That is, when exciting forces are produced by nonuniformities of opposite phases on both sides of the tire in the lateral direction, these exciting forces of opposite phase canceled each other out during the detection if the measurement is based on the "disc model” . These exciting forces of opposite phase may not be cancelled and may be applied to the vehicle shaft.
- a tire uniformity measurement method which comprises the steps of mounting a tire on a spindle of a uniformity measurement apparatus, pressing a circumferential surface of a rotating drum against the tread surface of the tire with a first pressing force, rotating the tire around rotational axis thereof, and computing the forces which the tire acts on first and second planes of the tire while the tire is rotating.
- the first plane is perpendicular to the rotational axis and in one sidewall side of the tire.
- the second plane is perpendicular to the rotational axis and in the other sidewall side of the tire.
- the forces are computed based on a measured values obtained by measuring forces transmitted to the spindle from the tire at first and second positions.
- the first and second positions have different distances from the tire in the rotational axis direction.
- the first plane includes the one sidewall of the tire and the second plane includes the other sidewall of the tire.
- the first pressing force is determined by dividing the weight of a vehicle on which the tire is mounted by the number of tires mounted on the vehicle.
- the method measures forces by which the tire acts on the first and second planes of the tire while the tire is rotating and the circumferential surface of the rotating drum is pressed against the tread surface of the tire with a second pressing force.
- the second pressing force produces a friction force between the rotating drum and the tire.
- the friction force is so large as enough to prevent free rotation of the rotating drum and is smaller than the measurement error of the forces measured at the first and second positions.
- one of the forces which the tire acts on first and second planes of the tire exceeds a predetermined value when the circumferential surface of the rotating drum is pressed against the tread surface of the tire with the first pressing force, the pressing force with which the circumferential surface of the rotating drum is pressed against the tread surface of the tire is changed into the second pressing force, and the forces which the tire acts on the first and second planes of the tire are measured.
- a calibration is performed on uniformity measurement apparatus using the result of measurement of the forces at the first and second positions when a predetermined weight is attached at a predetermined position on the first plane of a balanced tire and when the predetermined weight is attached at a predetermined position on the second plane of a balanced tire.
- the other object of the invention is to provide a tire uniformity measurement apparatus for detecting the nonuniformity of a tire, which is capable of evaluating a tire whether the tire causes above-described phenomena.
- a tire uniformity measurement apparatus comprising a spindle for rotating a tire around the rotational axis thereof, a rotating drum pressed against the tread of the tire with a first pressing force, a sensor for measuring force transmitted from the tire to the spindle, and a computing means for computing the forces by which the tire acts on first and second plane.
- the rotating drum is adapted to rotate around the rotational axis thereof as the tire rotates.
- the sensor measures the force transmitted from the tire to the spindle at a first position and a second position.
- the first pressing force is determined by dividing the weight of a vehicle on which the tire is mounted by the number of tires mounted on the vehicle.
- apparatus measures forces by which the tire acts on the first and second planes of the tire while the tire is rotating and the circumferential surface of the rotating drum is pressed against the tread surface of the tire with a second pressing force.
- the second pressing force produces a friction force between the rotating drum and the tire.
- the friction force is so large as enough to prevent free rotation of the rotating drum and is smaller than the measurement error of the forces measured at the first and second positions.
- the apparatus further comprises a tire cutting means for cutting the tire so that the amplitude of fluctuation of the force by which the tire acts on the first plane and the amplitude of fluctuation of the force by which the tire acts on the second plane are decreased.
- the apparatus further comprises a tire cutting means for cutting the tire so that the amplitude of fluctuation of the force by which the tire acts on the first plane and the amplitude of fluctuation of the force by which the tire acts on the second plane are decreased.
- the forces are measured when the rotating drum is pressed against the tread of the tire with the second pressing force.
- the apparatus further comprises a marking means for marking the position at which the tire should be cut and the amount by which it should be cut so that the amplitude of fluctuation of the force by which the tire acts on the first plane and the amplitude of fluctuation of the force by which the tire acts on the second plane will be decreased.
- Fig. 1 shows a front view of a high speed tire uniformity measurement apparatus according to an embodiment of this invention
- Fig. 2 is a detailed block diagram of the control section 400 in Fig. 1
- Fig. 3 is a time chart showing the tire dynamic balance and uniformity measurement method using the measurement apparatus 1, according to the embodiment shown in Fig. 1
- Fig. 4 is a time chart showing the tire dynamic balance and uniformity measurement method using the measurement apparatus 1, according to the modified embodiment of this invention.
- FIRST EMBODIMENT Fig. 1 shows a front view of a high-speed tire uniformity measurement apparatus which is an embodiment of this invention.
- the measurement apparatus 1 which is an embodiment of this invention measures the high-speed uniformity of the tire, the uniformity according to JAS 0 C 607 standard, and the tire dynamic balance.
- it includes a marking apparatus which can mark the tire for use in removing tire unbalance. Dynamic balance is measured by rotating the tire in free rotation and measuring the centrifugal force that arises at that time.
- the tire is rotated together with a rotating drum, with the rotating drum pressed against the tire tread surface.
- the pressing force which presses the tire against the rotating drum is set small, to 50 to 80 [kgf] .
- the shaft section 201a of the spindle 201 is inserted into and engaged with the through-hole 202a in the spindle housing 202 via a plurality of bearings 204. Accordingly, the spindle 201 is rotatably supported by the spindle housing 202.
- the top adapter 203 has a shaft 203a which extends vertically downward. This shaft 203a can be inserted into a hole 201c formed in the top surface of the chuck section 201a.
- the hole 203c in a chuck section 201a is formed so as to be coaxial with the chuck section 201a.
- the chuck section 201a is provided with a lock mechanism that locks the shaft 203a in a similar manner as described in the patent disclosure 2003-4597A by the present applicant.
- the wheeled tire W is placed on the top surface of the chuck section 201a of the spindle 201 so that the hub hole in the tire and the hole 201c in the chuck section 201a are arranged coaxially.
- the shaft 203a of the top adapter 203 is inserted into the hole 201c so that the top adapter presses the wheel of the tire W toward the top surface of the chuck section 201a.
- the tire W is then fixed to the spindle 201, so as to become integrated with the spindle 201, by locking the shaft 203a.
- the wheeled tire W is attached to the spindle, however, it is also possible for a wheelless tire to be retained between the upper rim and the lower rim, and attached to the spindle as in the apparatus described in patent publication 2002-350293A.
- the spindle 201 and the tire W attached to the spindle 201 are rotatably driven by a rotating drum section 300.
- the rotating drum section 300 has the rotating drum 301.
- the rotating drum 301 is a cylindrical member which is capable of rotating around its rotational axis.
- the rotational axis of the rotating drum 301 and the rotational axis of the spindle 201 are substantially parallel .
- the rotating drum section 300 has a motor that rotationally drives the rotating drum 301.
- the transmission system 303 comprises a drive pulley 303a, a driven pulley 303b and an endless belt 303c.
- the drive pulley 303a is attached to the rotational shaft of the motor 302 and the driven pulley 303b to the rotational shaft of the rotating drum 301, respectively.
- the endless belt 303c is wound around the drive pulley 303a and driven pulley 303b.
- the rotational motion of the motor 302 is transmitted to the rotating drum 301 via this belt-pulley mechanism. That is, it is possible to rotate the rotating drum 301 by driving the motor 302.
- the motor 302 is a stepping motor, and its rotational rate can be controlled by the control section 400. Therefore, in the high speed uniformity measurement apparatus 1 of the embodiment, the rotating drum 301 can be rotated at the desired rotational rate.
- the rotating drum loading mechanism 304 is formed in the base section 100.
- the cylindrical surface 301a of the rotating drum 301 can move the rotating drum 301, the motor 302 and the transmission system 303 in the horizontal direction (the left-right direction in the Figure) such that they approach toward or away from the tread surface of the tire W. Further, by the rotating drum pressing mechanism 304, the cylindrical surface 301a of the rotating drum 301 can press tread surface of the tire Wat a predetermined pressing force.
- This side surface 202a of the spindle housing 202 is a flat surface which is parallel to the rotational axis of the spindle 201, and is perpendicular to the direction in which the rotating drum 301 presses against the tire.
- this side surface 202a and the rigid wall 102 are substantially parallel.
- the upper side load cell 501 and the lower side load cell 502 are positioned in the gap G between the side surface 202a and the rigid wall 102.
- the load cells 501 and 502 are both members on a flat plate; both surfaces of the load cells are positioned so that they contact one side surface 202a of the spindle housing 202 and the rigid wall 102.
- the load cells 501 and 502 are arranged in the axial direction of the spindle 201.
- the rigid wall 102 of the base section 100 is configured so that it is almost neither displaced nor deformed at all. Therefore, the rigid wall 102 provides an opposing force to the spindle housing 202, the opposing force balancing with the force by which the rotating drum 301 presses against the tire W.
- the load cells 501 and 502 which are gripped between the rigid wall 102 and the spindle housing 202, are able to detect the force occurred by displacement of the spindle housing 202.
- the load cells 501 and 502 are able to detect pressing forces applied to them in triaxial directions. That is, the load cells 501 and 502 are able to detect the pressing forces applied to them as 3 -dimensional vector quantities.
- the cylindrical surface 301a of the rotating drum 301 is pressed against the tread surface of the tire W with a predetermined pressing force, and the rotating drum 301 and the tire W are rotated together by driving the motor 302.
- the pressing force by which the rotating drum 301 presses the tire W and the exciting force arising from the nonuniformity of the tire W are applied to the load cells 501 and 502.
- the outputs of the load cells 501 and 502 are sent to the control section 400.
- the control section 400 processes the load cell output results and computes the value of the tire uniformity index and the position of the tire to be cut and the amount of cutting needed to decrease the tire nonuniformity.
- control section 400 controls the marking means 600 so as to mark the tire to indicate the tire cut position and cutting amount computed above.
- a tire on which such a mark has been made is buff-processed by an appropriate tire cutting apparatus to decrease the tire nonuniformity.
- a cutting means such as a cutting tool could be used in a configuration that makes it possible for the measurement apparatus 1 to perform the buff alteration needed to decrease the nonuniformity.
- Fig. 2 shows a detailed block diagram of the control section 400 in Fig. 1.
- the control section 400 comprises a CPU 401, a memory 402, an I/O controller 403, a input means 404, a video controller 405, a monitor 406, first through third filters 411, 421 and 431, and first through third A/D converters 412, 422 and 432.
- the input means 404 is, for example, a keyboard. The operator of the measurement apparatus 1 operates this input means 404 to direct the measurement apparatus 1 to perform various measurements and calibration.
- the input means 404 is connected to the I/O controller 403; the CPU 401 controls the I/O controller 403 to read out the input contents input by the input means 404.
- the CPU 401 controls the I/O controller 403 to perform various measurements and calibration corresponding to the contents of the instructions included in the contents of input by the input means 404.
- a motor 302 (Fig. 1) which drives the rotating drum 301, a rotary encoder 205 and a motor which drives the rack-pinion mechanism of the rotating drum pressing mechanism 304 are connected to the I/O controller 403.
- the CPU 401 can rotate the rotating drum 301 so that the tire W rotates at a desirable rotation speed, and can move the rotating drum 301 toward or away from the tire W, by controlling the I/O controller 403.
- the output from the upper side load cell 501 is sent to the first filter 411 (Fig. 2) .
- the first filter 411 removes noise from the input signal.
- the signal from which noise has been removed is sent to the first A/D converter 412.
- the first A/D converter discretizes the input signal and sends it to the I/O controller 403.
- the output from the lower side load cell 502 (Fig. 1) is passed through the second filter 421 (Fig. 2) where noise is removed from it; next, it is discretized in the second A/D converter 422 and then sent to the I/O controller 403.
- the output from the load cell 304a (Fig. 1) attached to the rack-pinion mechanism of the rotating drum pressing mechanism 304 (Fig. 1) is passed through the third filter 431 (Fig. 2) where noise is removed from it, then it is discretized in the third A/D converter 432, and finally sent to the I/O controller 403.
- the CPU 401 controls the I/O controller 403.
- the discretized signals sent from the first, second and third A/D converters can be read out and stored in the memory 402 as digital data.
- the CPU 401 processes the digital data stored in the memory 402 and computes various measured values.
- the CPU 401 controls the video controller 405 and can display image information related to the computed measured values (for example a graph showing fluctuations of the tire exciting force as a function of tire phase) on the monitor 406.
- the "calibration" referred to here is the determination of the coefficient for computing the forces actually received by the load cells from the load cell output signals; and determination of the coefficient for computing the force acting on the plane including the upper sidewall of the tire in Fig. 1 (referred to below as the upper surface) and the force acting on the plane including the lower sidewall of the tire in Fig.
- the lower surface 1 (referred to below as the lower surface) , respectively, from the forces received by the load cells. It is sufficient for the calibration of the coefficients used to compute the forces actually received by the load cells from the load cell output signals to be performed periodically (for example once per week) , therefore it is not necessary to perform these calibrations every time a tire is measured. Additionally, it is sufficient to perform the calibration to determine the coefficient used to compute the forces occurring at the upper and lower tire surfaces, respectively, from the forces received by the load cells once for each type of tire. First, calibration to determine the coefficient used to obtain the force received by the load cell 304a from the output level of the load cell 304a of the rotating drum pressing mechanism 304 is performed.
- the computed a x and bi are stored in the memory 402. Similarly, calibrations are performed to determine the coefficients used to obtain the forces received by load cells from the outputs of load cells, for the upper side load cell 501 and the lower side load cell 502.
- a force of known magnitude is applied to the spindle housing 202, and the outputs of the load cells 501 and 502 at that time are used to determine the coefficient used to obtain the forces received by the load cells from the load cell output levels.
- Each of the upper side load cell 501 and the lower side load cell 502 measures force components in 3 mutually orthogonal directions (to be referred to below as the x, y and z directions, respectively) , therefore the calibrations are performed for each component.
- the x, y and z directions respectively
- the spindle housing 502 is a kind of cantilever beam wherein the positions at which the load cells 501 and 502 are mounted are defined as support points, the load on the spindle housing 202 is dividedly distributed to the load cells 501 and 502. Therefore, when a force Fx is applied to the spindle housing 202 in the x component direction, the relation given by the Equations (1) holds among the magnitude Fx x of the force in the x component direction received by the load cell 501, the x component output Ox ⁇ of the load cell 501, the magnitude Fx 2 of the force in the x component direction received by the load cell 502 and the x component Ox 2 of the output of the load cell 502.
- Fx FX j + Fx 2
- Fx j ax j x Ox j + bx q • (i)
- Fx 2 ax 2 * Ox 2 + bx 2
- the coefficients required to obtain the x components of the forces received by the load cells from the load cell output levels are computed for the upper side load cell 501 and the lower side load cell 502.
- the coefficients required to obtain the y and z components of the forces received by the load cells from the load cell output levels are computed from the upper side load cell 501 and the lower side load cell 502.
- the coefficients required to obtain the y and z components of the forces received by the load cells from the load cell output levels are computed by a similar procedure.
- a tire which can be regarded as having neither nonuniformity nor unbalance (referred to below as the master tire) , and a known weight, are used.
- the weight of mass M is attached to the top surface of the master tire at a specified distance s from the rotational axis of the tire. At this time, the top surface of the master tire is unbalanced by the weight, while the bottom surface remains without unbalance.
- the master tire is attached to the spindle 201.
- the rotating drum pressing mechanism 304 is rotatably driven so that the rotating drum 301 presses on the master tire with a force of 50 to 80 [kgf] .
- the rotating drum pressing mechanism 304 is driven so that the output of the load cell 304a indicates 50 to 80 [kgf] .
- the rotating drum 301 is rotatably driven by the motor 302.
- the master tire rotates together with the rotating drum.
- the CPU 401 (Fig. 2) controls the I/O interface 403 to acquire the outputs of the load cells 501 and 502. From the outputs of the load cells, the CPU 401 (Fig. 2)
- TF X is the value obtained from the output of the upper side load cell 501
- TF 2 is the value obtained from the output of the lower side load cell 502.
- ⁇ is the phase of the spindle 201.
- the component in the tractive direction of the centrifugal force produced at the top surface of the master tire can be regarded as nearly equivalent to the component in the tractive direction of the centrifugal force produced by the tire unbalance. Therefore, the component in the tractive direction of the force produced at the top surface of the master tire is approximately a sine wave with the absolute value of the signed maxima and minima being M x s x (2 ⁇ x N) 2 , and its phase depends on the position at which the weight is attached. This function is called Fm ⁇ ( ⁇ ) .
- the rotation of the rotating drum 301 is stopped.
- the weight is removed from the top surface of the master tire.
- the weight of mass M is attached to the bottom surface of the master tire at a specified position a distance s from the rotational axis of the tire. At this time, the weight produces unbalance of the bottom surface of the master tire, while the top surface remains without unbalance.
- the rotating drum pressing mechanism 304 is driven to press the rotating drum against the master tire with a force of 50 to 80 [kgf] . In other words, the rotating drum pressing mechanism 304 is driven so that the output of the load cell 304a indicates 50 to 80 [kgf] .
- the rotating drum 301 is rotatably driven by the motor 302. At this time, the master tire rotates together with the rotating drum.
- the CPU 401 (Fig. 2) controls the I/O interface 403 to acquire the outputs of the load cells 501 and 502. From the outputs of the load cells, the CPU 401 (Fig. 1) obtains the components of the forces received by the load cells 501 and 502 in the tractive direction. The values that are obtained are BF ⁇ ( ⁇ ) and BF 2 ( ⁇ ) .
- BF X is the value obtained from the output of the upper side load cell 501
- BF is the value obtained from the output of the lower side load cell 502.
- ⁇ is the phase of the spindle 201.
- the force produced in the tire is the resultant of a force that can be regarded as practically the equivalent of the centrifugal force produced by unbalance in the tire, and the force with which the rotating drum 301 presses the tire. Since the force with which the rotating drum 301 presses the tire is in a direction nearly perpendicular to the tractive direction of the tire, the component in the tractive direction of the centrifugal force produced at the bottom surface of the master tire can be regarded as nearly equivalent to the component in the tractive direction of the centrifugal force produced by the tire unbalance.
- the component in the tractive direction of the force produced at the top surface of the master tire is approximately a sine wave with the absolute value of the signed maxima and minima being M x s x (2 ⁇ x N) 2 , and its phase depends on the position at which the weight is attached. This function is called Fm 2 ( ⁇ ) .
- Fm 2 ( ⁇ ) the proportion of force oc 2 received by the top surface load cell 501 and the proportion
- ⁇ 2 Fm 2 ( ⁇ )/BF 1 ( ⁇ ) .
- the exciting force produced at the top surface of the tire and the exciting force produced at the bottom surface of the tire can be computed from the outputs of the load cells 501 and 502 by using ⁇ i and ⁇ 2 determined above.
- TTW is the component in the tractive direction of the exciting force which occurs at the top surface
- TBW is the tractive component of the exciting force which occurs at the bottom surface
- MF X is defined as the component in the tractive directive direction of the force detected by the top side load cell 501
- MF 2 is defined as the component in the tractive direction of the force detected by the bottom side load cell 502.
- TTW ((1 -a 2 ) x MF, -a 2 x MF 2 )/( ⁇ , -a 2 )
- the components in the tractive direction of the exciting forces which occur at the top surface and bottom surface, respectively, of the tire can be found from the components in the tractive direction of the forces received by the load cells 501 and 502.
- calibration is performed to determine the coefficients needed to find the component in the radial direction (the direction from the position where the master tire and the rotating drum are in contact, that is, the left-right direction in Fig.
- the weight of mass M is attached to the top surface of the tire at a specified distance s from the rotational axis of the tire. At this time, unbalance due to the weight occurs at the top surface of the tire, while at the same time the bottom surface remains free of unbalance.
- the rotating drum pressing mechanism 304 is driven so that the rotating drum 301 presses the master tire with a force of about 50 to 80 [kgf] .
- the rotating drum pressing mechanism 304 is driven so that the load cell 304a output indicates 50 to 80 [kgf] .
- the magnitude of the force with which the rotating drum 301 presses the master tire is fixed through this calibration. This magnitude is called FD .
- the rotating drum 301 is rotatably driven by the motor 302. At this time, the master tire rotates together with the rotating drum.
- the CPU 401 Fig.
- the CPU 401 (Fig. 1) obtains the components in the radial direction of the forces received by the load cells 501 and 502 during one complete rotation of the master tire. These values are called TF3 ( ⁇ ) and TF4 ( ⁇ ) .
- TF3 ( ⁇ ) is the value obtained from the output of the top side load cell 501
- TF4 ( ⁇ ) is the value obtained from the output of the bottom side load cell 502.
- ⁇ is the phase of the spindle 201.
- the force produced in the tire is the resultant of a force that can be regarded as practically the equivalent of the centrifugal force produced by unbalance in the tire, and the force with which the rotating drum 301 presses the tire. Therefore, the force in the radial direction that acts on the top surface of the master tire is approximated by a sine wave that has a maximum value of M x s x (2 ⁇ x N) 2 + FD/2 and a minimum value of M x s x (2 ⁇ x N) 2 - FD/2.
- the phase is determined by the position at which the weight is attached. This function is called Fm 3 ( ⁇ ) .
- the weight of mass M is attached to the bottom surface of the master tire at a specified position a distance s from the rotational axis of the tire. At this time, an unbalance due to the weight occurs in the bottom surface of the master tire, while the top surface remains free of unbalance.
- the rotating drum pressing mechanism 304 is driven so that the rotating drum 301 presses the master tire with force FD.
- the rotating drum 301 is rotatably driven by the motor 302. At this time, the master tire rotates together with the rotating drum.
- the CPU 401 Fig.
- the CPU 401 (Fig. 1) obtains the components in the radial direction of the forces received by the load cells 501 and 502 during one complete rotation of the master tire. These values are called BF 3 ( ⁇ ) and BF 4 ( ⁇ ) .
- BF 3 ( ⁇ ) is the value obtained from the output of the top side load cell 501
- BF ( ⁇ ) is the value obtained from the output of the bottom side load cell 502.
- ⁇ is the phase of the spindle 201.
- the force produced in the tire is the resultant of a force that can be regarded as practically the equivalent of the centrifugal force produced by unbalance in the tire, and the force with which the rotating drum 301 presses the tire. Consequently, the force in the radial direction that acts on the top surface of the master tire is approximated by a sine wave that has a maximum value of M x s x (2 ⁇ x N) 2 + FD/2 and a minimum value of M x s x (2 ⁇ x N) 2 - FD/2.
- the phase is determined by the position at which the weight is attached. This function is called Fm 4 ( ⁇ ) .
- the resultant of the force applied to the top surface of the tire and the exciting force produced at the top surface of the tire and the resultant of the force applied to the bottom surface of the tire and the exciting force produced at the bottom surface of the tire can be computed from the outputs of the load cells 501 and 502 by using ⁇ i and ⁇ 2 determined above. That is to say, suppose that, in a given tire, RTW is the component in the radial direction of the resultant of the force applied to the top surface of the tire and the exciting force which occurs at the top surface, and RBW is the component in the radial direction of the resultant of the force applied to the bottom surface of the tire and the exciting force which occurs at the bottom surface.
- Equations 4 among RTW, RBW, MF 3 and MF 4 are satisfied.
- MF 4 RTWx (1- ⁇ ) +RBW ( ⁇ - ⁇ 2 )
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Testing Of Balance (AREA)
- Tires In General (AREA)
- Length Measuring Devices With Unspecified Measuring Means (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/569,333 US7434454B2 (en) | 2003-08-25 | 2004-08-25 | Method and apparatus for tire uniformity measurement |
DE602004011785T DE602004011785T2 (en) | 2003-08-25 | 2004-08-25 | Method and device for measuring uniformity of tires |
EP04772553A EP1658482B1 (en) | 2003-08-25 | 2004-08-25 | Method and apparatus for tire uniformity measurement |
CN2004800179463A CN1813180B (en) | 2003-08-25 | 2004-08-25 | Method and apparatus for tire uniformity measurement |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003300241A JP4339048B2 (en) | 2003-08-25 | 2003-08-25 | Tire uniformity measuring method and apparatus, and tire correcting method and apparatus |
JP2003-300241 | 2003-08-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005019791A1 true WO2005019791A1 (en) | 2005-03-03 |
Family
ID=34213815
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/012597 WO2005019791A1 (en) | 2003-08-25 | 2004-08-25 | Method and apparatus for tire uniformity measurement |
Country Status (8)
Country | Link |
---|---|
US (1) | US7434454B2 (en) |
EP (1) | EP1658482B1 (en) |
JP (1) | JP4339048B2 (en) |
KR (1) | KR100784882B1 (en) |
CN (1) | CN1813180B (en) |
DE (1) | DE602004011785T2 (en) |
TW (1) | TWI346773B (en) |
WO (1) | WO2005019791A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9114676B2 (en) | 2010-02-17 | 2015-08-25 | Snap-On Equipment Srl A Unico Socio | Tire changer and method of measuring force variations |
CN104977173A (en) * | 2015-07-28 | 2015-10-14 | 安徽机电职业技术学院 | Tire uniformity parameter measuring device |
CN106017801A (en) * | 2016-05-13 | 2016-10-12 | 深圳市元征科技股份有限公司 | Electronic measuring device and tire balancing machine |
US11549863B2 (en) * | 2014-12-02 | 2023-01-10 | Micro-Poise Measurement Systems Llc | Tire uniformity testing machine |
Families Citing this family (32)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4767808B2 (en) * | 2006-10-03 | 2011-09-07 | 株式会社神戸製鋼所 | Tire inspection machine accuracy inspection method |
JP5128661B2 (en) * | 2007-05-15 | 2013-01-23 | オートバランス・ピーエルシー | Method and apparatus for analyzing a vehicle wheel |
EP2107356A1 (en) * | 2008-03-31 | 2009-10-07 | Carnehammar, Lars Bertil | Method, apparatus and system for analyzing a vehicle wheel |
JP5403952B2 (en) * | 2008-06-11 | 2014-01-29 | 株式会社神戸製鋼所 | Tire testing machine and tire testing method |
JP4369983B1 (en) | 2008-07-25 | 2009-11-25 | 株式会社神戸製鋼所 | Master tire and inspection method of tire uniformity testing machine using the master tire |
JP5047112B2 (en) * | 2008-10-07 | 2012-10-10 | 株式会社神戸製鋼所 | Tire testing machine and tire testing method |
US8011235B2 (en) * | 2009-04-16 | 2011-09-06 | Bridgestone Americas Tire Operations, Llc | Apparatus and method for measuring local tire stiffness |
JP5371848B2 (en) * | 2009-12-07 | 2013-12-18 | 株式会社神戸製鋼所 | Tire shape inspection method and tire shape inspection device |
JP5631264B2 (en) * | 2011-05-30 | 2014-11-26 | 株式会社神戸製鋼所 | Tire balance test method and tire balance tester |
US8701479B2 (en) * | 2012-02-10 | 2014-04-22 | Commercial Time Sharing Inc. | System for characterizing tire uniformity machines and methods of using the characterizations |
US9140628B2 (en) | 2012-02-10 | 2015-09-22 | Akron Special Machinery, Inc. | System for characterizing tire uniformity machines and methods of using the characterizations |
US8943881B2 (en) | 2012-02-10 | 2015-02-03 | Akron Special Machinery, Inc. | System for characterizing tire uniformity machines and methods of using the characterizations |
JP5986640B2 (en) * | 2012-10-12 | 2016-09-06 | 国際計測器株式会社 | Motor unit, power simulator, torsion test device, rotary torsion test device, linear motion actuator and vibration device |
KR101385096B1 (en) * | 2012-12-12 | 2014-04-14 | 한국타이어 주식회사 | Tire cleat impact tester |
JP5487331B1 (en) * | 2013-01-08 | 2014-05-07 | 本田技研工業株式会社 | Master tire assembly, basic data creation method using the same, and calibration method for uniformity measuring device |
US20150109626A1 (en) * | 2013-10-20 | 2015-04-23 | Starrett Bytewise Development, Inc. | Tire Digitizer |
ITMI20131988A1 (en) | 2013-11-28 | 2015-05-29 | Pirelli | METHOD AND APPARATUS FOR MONITORING TIRES |
JP6412437B2 (en) * | 2014-05-12 | 2018-10-24 | 株式会社神戸製鋼所 | Tire rolling resistance prediction method and tire rolling resistance prediction apparatus |
JP6282198B2 (en) * | 2014-08-27 | 2018-02-21 | 株式会社神戸製鋼所 | Tire uniformity testing machine and tire uniformity measuring method |
JP5905063B1 (en) * | 2014-10-09 | 2016-04-20 | 株式会社神戸製鋼所 | Estimation method of load model in tire uniformity testing machine |
JP5885804B1 (en) * | 2014-10-09 | 2016-03-16 | 株式会社神戸製鋼所 | Method of creating load estimation model in tire uniformity testing machine |
JP6442316B2 (en) * | 2015-02-09 | 2018-12-19 | Ntn株式会社 | Wheel speed rotation fluctuation pattern extraction device and its reference pattern setting method |
TWI573714B (en) * | 2015-04-22 | 2017-03-11 | 陳進聰 | Distal safety car maintenance monitoring system |
US10933549B2 (en) | 2015-10-05 | 2021-03-02 | 3M Innovative Properties Company | Apparatus and method for automatically applying weight material to a wheel |
US9677972B2 (en) | 2015-10-26 | 2017-06-13 | Commercial Time Sharing Inc. | System and method for characterizing tire uniformity machines |
CN106289813B (en) * | 2016-09-20 | 2019-05-03 | 北京工业大学 | A kind of tyre evenness detection device |
JP6647994B2 (en) * | 2016-09-20 | 2020-02-14 | 株式会社神戸製鋼所 | Tire rolling resistance evaluation device |
US10371593B2 (en) | 2016-11-08 | 2019-08-06 | Akron Special Machinery, Inc. | Dynamic balancer |
JP6735254B2 (en) * | 2017-06-21 | 2020-08-05 | 株式会社神戸製鋼所 | Device and method for calculating tire dynamic load radius |
CN108195700B (en) * | 2017-12-26 | 2020-04-24 | 重庆程顺汽车配件制造有限公司 | Tire wear test structure and manufacturing method thereof |
KR102104674B1 (en) | 2018-08-28 | 2020-04-24 | 금호타이어 주식회사 | Device detecting uniformity of tyre |
US11333569B2 (en) | 2018-09-14 | 2022-05-17 | Akron Special Machinery, Inc. | Dynamic balancer with a frameless motor drive |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4078339A (en) * | 1974-11-18 | 1978-03-14 | Ongaro Dynamics, Inc. | Method for correcting rubber tires for forces generated by dynamic non-uniformities |
US4128969A (en) * | 1975-09-18 | 1978-12-12 | The General Tire & Rubber Company | Apparatus for reducing tangential force variation in pneumatic tires |
US4423632A (en) * | 1981-02-25 | 1984-01-03 | Qyl Inc. | Method and apparatus to determine the imbalance in a rotating object |
EP1126267A2 (en) * | 2000-02-17 | 2001-08-22 | Bridgestone Corporation | High speed tyre uniformity measurement device |
EP1239275A2 (en) * | 2001-03-08 | 2002-09-11 | Kokusai Keisokuki Kabushiki Kaisha | Apparatus and method for measuring uniformity and/or dynamic balance of a tire |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2276687A (en) * | 1940-04-03 | 1942-03-17 | Cleveland | Tire repairing apparatus |
JPS5548251B2 (en) * | 1973-05-30 | 1980-12-04 | ||
JPH0449057A (en) * | 1990-06-18 | 1992-02-18 | Matsushita Electric Ind Co Ltd | Thin film type thermal head and manufacture thereof |
JP3040514B2 (en) * | 1991-04-09 | 2000-05-15 | 三菱重工業株式会社 | Tire dynamic balance measuring machine |
US5309377A (en) * | 1991-11-05 | 1994-05-03 | Illinois Tool Works Inc. | Calibration apparatus and method for improving the accuracy of tire uniformity measurements and tire testing method using same |
JP3129872B2 (en) * | 1993-02-02 | 2001-01-31 | 株式会社神戸製鋼所 | Unbalance correction method using high-speed tire uniformity machine |
DE4317970A1 (en) * | 1993-05-28 | 1994-12-01 | Hofmann Maschinenbau Gmbh | Device for accommodating a pneumatic tyre in a measuring device |
US5614676A (en) * | 1996-03-08 | 1997-03-25 | The Goodyear Tire & Rubber Company | Method of machine vibration analysis for tire uniformity machine |
CN1180163A (en) * | 1996-03-08 | 1998-04-29 | 固特异轮胎和橡胶公司 | Method of machine vibration analysis for tire uniformity machine |
US6035709A (en) * | 1996-07-30 | 2000-03-14 | The Goodyear Tire & Rubber Company | Method of enhancing the measurement accuracy of a tire uniformity machine |
US6016695A (en) * | 1997-01-24 | 2000-01-25 | Illinois Tool Works Inc. | Tire uniformity testing system |
US5979231A (en) * | 1997-01-24 | 1999-11-09 | Illinois Tool Works, Inc. | Loadwheel assembly for tire testing systems having conical support plates |
DE19734904C2 (en) * | 1997-08-12 | 1999-09-23 | Carlo Buzzi | Device for measuring the uniformity of a vehicle tire |
JP3977500B2 (en) * | 1997-12-16 | 2007-09-19 | 国際計測器株式会社 | Tire uniformity and dynamic balance test equipment |
US6651716B1 (en) * | 2000-02-23 | 2003-11-25 | The Goodyear Tire & Rubber Company | Method and tire adapted for post cure tire uniformity correction |
JP4014822B2 (en) * | 2001-05-22 | 2007-11-28 | 国際計測器株式会社 | Tire uniformity and dynamic balance test equipment |
-
2003
- 2003-08-25 JP JP2003300241A patent/JP4339048B2/en not_active Expired - Fee Related
-
2004
- 2004-08-25 KR KR1020067003832A patent/KR100784882B1/en active IP Right Grant
- 2004-08-25 WO PCT/JP2004/012597 patent/WO2005019791A1/en active IP Right Grant
- 2004-08-25 CN CN2004800179463A patent/CN1813180B/en active Active
- 2004-08-25 EP EP04772553A patent/EP1658482B1/en active Active
- 2004-08-25 US US10/569,333 patent/US7434454B2/en active Active
- 2004-08-25 DE DE602004011785T patent/DE602004011785T2/en active Active
- 2004-08-26 TW TW093125472A patent/TWI346773B/en active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4078339A (en) * | 1974-11-18 | 1978-03-14 | Ongaro Dynamics, Inc. | Method for correcting rubber tires for forces generated by dynamic non-uniformities |
US4128969A (en) * | 1975-09-18 | 1978-12-12 | The General Tire & Rubber Company | Apparatus for reducing tangential force variation in pneumatic tires |
US4423632A (en) * | 1981-02-25 | 1984-01-03 | Qyl Inc. | Method and apparatus to determine the imbalance in a rotating object |
EP1126267A2 (en) * | 2000-02-17 | 2001-08-22 | Bridgestone Corporation | High speed tyre uniformity measurement device |
EP1239275A2 (en) * | 2001-03-08 | 2002-09-11 | Kokusai Keisokuki Kabushiki Kaisha | Apparatus and method for measuring uniformity and/or dynamic balance of a tire |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9114676B2 (en) | 2010-02-17 | 2015-08-25 | Snap-On Equipment Srl A Unico Socio | Tire changer and method of measuring force variations |
US9834047B2 (en) | 2010-02-17 | 2017-12-05 | Snap-On Equipment Srl A Unico Socio | Tire changer and method of measuring force variations |
US11549863B2 (en) * | 2014-12-02 | 2023-01-10 | Micro-Poise Measurement Systems Llc | Tire uniformity testing machine |
CN104977173A (en) * | 2015-07-28 | 2015-10-14 | 安徽机电职业技术学院 | Tire uniformity parameter measuring device |
CN106017801A (en) * | 2016-05-13 | 2016-10-12 | 深圳市元征科技股份有限公司 | Electronic measuring device and tire balancing machine |
CN106017801B (en) * | 2016-05-13 | 2018-10-30 | 深圳市元征科技股份有限公司 | Electronic measuring device and tire balancing equipment |
Also Published As
Publication number | Publication date |
---|---|
CN1813180B (en) | 2013-08-07 |
EP1658482B1 (en) | 2008-02-13 |
TW200508585A (en) | 2005-03-01 |
CN1813180A (en) | 2006-08-02 |
DE602004011785D1 (en) | 2008-03-27 |
KR20060033044A (en) | 2006-04-18 |
JP4339048B2 (en) | 2009-10-07 |
US20060272408A1 (en) | 2006-12-07 |
TWI346773B (en) | 2011-08-11 |
DE602004011785T2 (en) | 2009-02-05 |
JP2005069885A (en) | 2005-03-17 |
KR100784882B1 (en) | 2007-12-14 |
US7434454B2 (en) | 2008-10-14 |
EP1658482A1 (en) | 2006-05-24 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP1658482B1 (en) | Method and apparatus for tire uniformity measurement | |
JP4025560B2 (en) | Prediction of tire uniformity using balance and low speed uniformity data | |
US7428467B2 (en) | Method for tangential force variation and angular acceleration fluctuation prediction in tires | |
US8701479B2 (en) | System for characterizing tire uniformity machines and methods of using the characterizations | |
US9778032B2 (en) | Method for prediction and control of tire uniformity parameters from crown thickness variation | |
EP2580567B1 (en) | Method for prediction and control of harmonic components of tire uniformity parameters | |
EP0794420B1 (en) | Method of machine vibration analysis for tire uniformity machine | |
US6139401A (en) | Method of correcting the imbalance of a pneumatic tire with a tire uniformity machine | |
US8186215B2 (en) | Method and system for determining non-uniformity characteristics of a vehicle tire and rim | |
JP4808924B2 (en) | Analysis and control method of tire uniformity | |
US4055081A (en) | Method and apparatus for improving the ride characteristics of motor vehicle wheels | |
JP2011107163A (en) | Vibration correction system for tire testing system | |
JPH08304212A (en) | Instrument and method for measuring unbalanced amount of wheel and method for correcting unbalanced amount | |
WO1998008070A1 (en) | Method of balance screening a pneumatic tire with a tire uniformity machine | |
CN112549868B (en) | Detection and analysis method for tire cavity noise and application thereof | |
JP3052655B2 (en) | Vehicle vibration measurement method | |
WO1998016810A1 (en) | Method of correcting the imbalance of a pneumatic tire with a tire uniformity machine | |
US5239867A (en) | Method and apparatus for improving the fit of a pneumatic tire on a motor vehicle wheel | |
JP2006242581A (en) | Tire uniformity correction method | |
Gillespie | Relationship of truck tire/wheel nonuniformities to cyclic force generation. Final report |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): BW GH GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LU MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 20048179463 Country of ref document: CN |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2004772553 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2006272408 Country of ref document: US Ref document number: 10569333 Country of ref document: US |
|
WWE | Wipo information: entry into national phase |
Ref document number: 1020067003832 Country of ref document: KR |
|
WWP | Wipo information: published in national office |
Ref document number: 1020067003832 Country of ref document: KR |
|
WWP | Wipo information: published in national office |
Ref document number: 2004772553 Country of ref document: EP |
|
WWP | Wipo information: published in national office |
Ref document number: 10569333 Country of ref document: US |
|
WWG | Wipo information: grant in national office |
Ref document number: 2004772553 Country of ref document: EP |