JP2006329831A - Testing device for wheel with vehicular tire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a testing device, capable of performing uniformity testing and a dynamic balance test of a wheel with a tire with a relatively simple system configuration, having an unchanged system configuration. <P>SOLUTION: A retaining means for vibratably retaining a measuring rotary axis includes a force detecting frame 5, having a first retaining frame 15 for retaining the measuring rotary axis vibratably in the horizontal X-direction, second retaining frames 16, 16' for retaining the first retaining frame 15 vibratably in the horizontal Y-direction perpendicular to the X-direction, a third retaining frame 17 for retaining the second frames 16, 16' vibratably in the vertical direction perpendicular to the X and Y directions. In the frame 5, first sensors 31, 32 for detecting vibrations of each retaining frame, second sensors 33, 34, and third sensors 11, 12, 11', 12' are provided. According to the present invention, the vibration of the measuring rotary axis, i.e., the vibration of the wheels with the vehicular tires can be detected accurately in three-dimensional direction, and the iniformity and the dynamic balance can be measured with an unchanged system configuration. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a test apparatus for performing a uniformity test and / or a dynamic balance test of a wheel with a tire for an automobile.

  Japanese Patent Laid-Open No. 2000-241303 discloses a prior art of a test apparatus for wheels with tires for automobiles. The “wheel tire testing device” disclosed in this publication is a device capable of performing a uniformity test and a dynamic balance test. However, when performing a uniformity test, the wheel portion is mounted on a spindle by a center pin. Rotate the spindle while pressing the rotating drum against the outer circumference of the tire while pressing against the tire. ”When performing a dynamic balance test, rotate the spindle with the center pin released. (Refer to claim 6 of the publication).

A prior example of a tire uniformity testing apparatus is disclosed in, for example, Japanese Patent Publication No. 57-37815. The force measuring device disclosed in this publication is a device for inspecting the uniformity of a single tire, not a tire attached to a wheel. A beam configuration that detects axial vibration is adopted.
JP 2000-241303 A Japanese Patent Publication No.57-37815

The test apparatus disclosed in Patent Document 1 has to change the pressing biased state by the center pin between the case where the uniformity test is performed and the case where the dynamic balance test is performed. The configuration for changing the system must be arranged as a large device on top of the wheeled tire to be tested.
Therefore, there is a drawback that the apparatus becomes large and complicated.

In the apparatus disclosed in Patent Document 2, the test object is a tire alone, not a wheel with a tire, and the beam configuration for force measurement is a configuration incorporated in the rotation shaft. There is a drawback that the detection accuracy is not high.
The present invention has been made based on such a background, and a main object of the present invention is to provide an automobile tire-equipped wheel testing apparatus having a relatively simple configuration and high measurement accuracy.

  Further, the present invention provides a test apparatus for a wheel with a tire for an automobile that can perform a uniformity test and a dynamic balance test of a wheel with a tire by simply switching whether or not to apply a load to the tire with the tire load apparatus. The other purpose is to provide.

  The invention according to claim 1 is a mounting device for mounting a tire-equipped wheel in a horizontal direction, a measurement rotary shaft extending vertically downward from the mounting device, and a measurement rotary shaft for holding the measurement rotary shaft so as to vibrate. A holding unit that holds the measurement rotation shaft in a vertical direction and holds the measurement rotation shaft in a horizontal X direction so as to vibrate; and a first holding frame. A second holding frame that holds the second holding frame so as to vibrate in a horizontal Y direction orthogonal to the X direction, and a third holding frame that holds the second holding frame so as to vibrate in the vertical direction perpendicular to the X direction and the Y direction. A first sensor for detecting vibration of the first holding frame, a second sensor for detecting vibration of the second holding frame, and the third frame. Detect vibration of holding frame And a means for calculating uniformity and / or dynamic balance of the tire-equipped wheel based on outputs of the first, second and third sensors, and a tire attached to the attachment device. A test apparatus for a wheel with a tire for an automobile, comprising: a tire load device capable of switching between a state in which the wheel with a wheel rotates while being pressed against the tire of the wheel, and a state in which the wheel with the tire is rotated; is there.

According to a second aspect of the present invention, the first holding frame, the second holding frame, and the third holding frame extend in the horizontal direction, and the first holding frame, the second holding frame, The test apparatus for a wheel with a tire for an automobile according to claim 1, wherein the test apparatus is arranged in the order of the holding frame.
According to a third aspect of the present invention, the third holding frame is configured such that a center position viewed in the Y direction is swingable about an axis in the X direction, and the third sensor is a third holding frame. The wheel tire-equipped wheel testing device according to claim 2, wherein the wheel tire-equipped wheel testing device is provided near both ends in the Y direction.

  According to a fourth aspect of the present invention, the tire load device is attached to the load rotary shaft extending in the vertical direction in parallel with the measurement rotary shaft, and has a predetermined diameter. The wheel with a tire for an automobile according to any one of claims 1 to 3, further comprising: a rotating drum whose peripheral surface is pressed against the tire; and means for moving the load rotating shaft in a horizontal direction. This is a testing device.

  According to the first aspect of the present invention, the measurement rotating shaft extending vertically downward to which the attaching device for the wheel with tire is connected is held by the holding means so as to be able to vibrate. The holding means includes a first holding frame that holds the measurement rotation shaft so as to be able to vibrate in the horizontal X direction, a second holding frame that holds the measurement rotating shaft so that it can vibrate in the horizontal Y direction perpendicular to the X direction, and a vertical direction A third holding frame that holds in a vibrating manner is provided as independent holding frames. Therefore, the measurement rotation shaft is held so as to be capable of three-dimensional vibration in three directions orthogonal to each other, and vibration generated on the measurement rotation shaft during the uniformity test and the dynamic balance test can be accurately detected.

  In addition, the measurement directions of the first sensor, the second sensor, and the third sensor that detect the vibration of each holding frame are three-dimensionally independent in three directions, and are considered not to be affected by other directions. Yes. Furthermore, each holding frame also has a structure capable of obtaining a sufficient strength for transmitting force only in the measuring direction. For this reason, both the uniformity test and the dynamic balance test can obtain accurate measurement values.

  In order to switch the test device between a tire-equipped wheel uniformity test and a dynamic balance test, the tire load device is pressed against the tire and rotated or separated from the tire, and the rotated tire-equipped wheel rotates with inertia. Just switch to the state. Therefore, switching of the test apparatus is easy, and there is no need to provide a complicated configuration for holding the wheel with a tire.

In the second aspect of the invention, the first holding frame, the second holding frame, and the third holding frame provided in the holding means can be configured to be flat in the horizontal direction, so that the height of the entire test apparatus can be obtained. Can be kept low. There is also an advantage that the holding means can be easily attached to the measuring device.
Here, a supplementary explanation will be given regarding the uniformity test of the wheel with tire.

Since the tire is a composite product such as fiber, steel wire, rubber, etc., it is not a completely uniform structure, and the outer peripheral surface (running surface) of the tire is partially different in size, uneven rigidity, and asymmetry. Etc. exist. Generally, measuring such non-uniformity of a tire is referred to as measuring uniformity or uniformity test.
When the tire has non-uniformity of a predetermined value or more, when the tire rolls, the vehicle may receive a lateral flow with an abnormal force from the road surface, or an abnormal vibration may occur due to a periodic reaction force fluctuation.

  For that reason, current tires usually undergo a uniformity test. In the uniformity test, a ground contact load was applied to the tire, and (1) radial force variation (RFV: magnitude of fluctuation of the radial force of the tire) on the tire contact surface, (2) lateral force deviation (LFD: side of the tire) Direction (thickness direction) force variation average), (3) lateral force variation (LFV: magnitude of force variation in the tire lateral direction (width direction)), (4) traction force variation (TFV: (Size of force fluctuation in the front-rear direction (traveling direction) of the tire), (5) steering torque deviation (STD: average value of steering torque (rotational torque on the tire contact surface)), (6) steering torque variation (STV: The six values of steering torque (the magnitude of fluctuations in the steering torque of the tire contact surface) are mainly inspected.

In the present invention, in the uniformity test, the above six component amounts generated in the tire can be correctly detected.
In particular, in the third aspect of the invention, the third holding frame not only holds the second holding frame so that it can vibrate in the vertical direction, but also the third holding frame itself can swing around the X axis. Has been. Then, the swing of the third holding frame can be measured by a pair of third sensors provided near both ends in the Y direction of the third holding frame. The swing of the third holding frame can be converted into the steering torque on the tire contact surface, that is, the value of the steering torque deviation (STD) and the steering torque variation (STV) when the tire of the tire-equipped wheel is loaded. .

Therefore, in the invention according to claim 3, it is possible to provide a uniformity test apparatus for a wheel with a tire for an automobile, which can also measure a steering torque deviation (STD) and a steering torque variation (STV).
According to the fourth aspect of the present invention, the tire load device can be realized by a simple configuration in which the tire load device is arranged side by side on the measuring device and the load rotation shaft having the rotating drum is moved in the horizontal direction.

  Therefore, the configuration in the height direction of the apparatus is not increased, and a relatively simple test apparatus can be constructed.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a front view of an automobile tire-equipped wheel testing apparatus according to an embodiment of the present invention, and FIG. 2 is a plan view thereof.
1 and 2, the test apparatus includes a measuring device 100 and a tire load device 200.

The measuring device 100 is a device for measuring forces in three directions (three-dimensional directions orthogonal to each other) generated as the mounted wheel 1 with a tire rotates.
On the other hand, the tire load device 200 is a device for applying a load to the tire of the tire-equipped wheel 1 to provide rotation, and has a configuration that can move in the left-right direction in FIGS.

Hereinafter, the configuration of the device will be described in detail in the order of the measurement device 100 and the tire load device 200.
The measuring device 100 includes a chuck device 3 to which the tire-equipped wheel 1 can be arranged and attached in the horizontal direction, and a spindle as a rotating shaft that has the chuck device 3 at the upper end and extends vertically downward from the chuck device 3. 4 is included. Further, a force detection frame 5 is provided as a holding means for holding the spindle 4 extending in the vertical direction in this state. One end (right side in FIGS. 1 and 2) of the force detection frame 5 is provided with a mounting portion 6 that protrudes in the right direction, and the mounting portion 6 is fixed to a base portion 8 that is erected on the machine base 7. .

The other end side (the left side in FIGS. 1 and 2) of the force detection frame 5 is another base portion 13 erected on the machine base 7 through the vibration sensors 11 and 12 (11 ′ and 12 ′). Is supported by.
As shown in FIG. 2, the base 13 is erected on the front side (lower side in FIG. 2) and the back side (upper side in FIG. 2) to form a pair, and the front side of the force detection frame 5 and The upper and lower sides are supported by vibration sensors 11, 12 (11 ', 12'), respectively. Therefore, the vibration sensors 11, 12, 11 ′, 12 ′ are provided on the front side base 13 and the back side base 13, respectively, corresponding to the paired bases 13.

  As shown in FIG. 2, the force detection frame 5 has a circular hole 14 in a plan view in the center, and a first holding frame 15 in which the spindle 4 is fitted in the hole 14 in the vertical direction, and the front side thereof. And a second holding frame 16 disposed on the back side (lower side and upper side in FIG. 2) and a third holding frame 17 surrounding the second holding frame 16. FIG. 3 shows a perspective view of the force detection frame 5. Next, the force detection frame 5 will be described more specifically with reference to FIGS.

  The first holding frame 15 provided at the most central portion has the hole 14 for attaching the spindle 4 as described above. The hole 14 is formed at the center of the first holding frame 15 having a substantially square shape in plan view. The first holding frame 15 is provided with leaf springs 19 and 19 'protruding in the vertical direction in FIG. 2 and in the Y direction in FIG. , 16 'are integrally connected. Leaf springs 20 and 20 'extending in the right direction in FIG. 2 (X direction in FIG. 3) protrude from the pair of second holding frames 16 and 16', respectively. The tip is connected integrally with the third holding frame 17. Further, the attachment portion 6 is integrally formed at one end edge of the third holding frame 17 via a spring portion 21. The spring portion 21 is narrower than the width of the third holding frame 17 in the Y direction.

  With this configuration, the first holding frame 15 is supported by the leaf springs 19 and 19 ', and can vibrate in the direction of the leaf springs 19 and 19', that is, the horizontal X direction in FIG. Further, the second holding frames 16, 16 'can vibrate in the direction of the leaf springs 20, 20', that is, the horizontal Y direction in FIG. The third holding frame 17 can vibrate in the direction in which the spring portion 21 is bent, that is, in the Z direction perpendicular to FIG. Further, the third holding frame 17 can swing around the X axis in accordance with the narrowing of the width of the spring portion 21.

Thereby, since the spindle 4 attached to the hole 14 is held by the force detection frame 5, the spindle 4 is held so as to freely vibrate in three directions orthogonal to each other in the X, Y, and Z directions.
When the first holding frame 15 vibrates in the X direction, the vibration sensor 31, respectively, is disposed between the first holding frame 15 and the third holding frame 17 when viewed in the X direction so that the vibration can be detected. 32 is provided. The vibration sensors 31 and 32 are sensors that are attached to the third holding frame 17 and detect changes in stress when the first holding frame 15 vibrates in the X direction.

In addition, vibration sensors 33 and 34 are provided between the second holding frames 16 and 16 ′ and the third holding frame 17 that make a pair. The vibration sensors 33 and 34 are attached to the third holding frame 17, respectively, and detect changes in stress when the second holding frames 16 and 16 'vibrate in the Y direction.
Furthermore, as already described, when the third holding frame 17 vibrates in the vertical direction (up and down) or swings around the X axis, the vibration sensors 11, 12, 11 ', 12 for detecting the vibration are detected. 'Is provided.

Therefore, the detection outputs of these sensors 11, 12, 11 ′, 12 ′, 31, 32, 33, 34, the first holding frame 15, the second holding frame 16, 16 ′, and the third holding frame 17. It is possible to measure the stress change that is experienced.
Each sensor 11, 12, 11 ', 12', 31, 32, 33, 34 in this embodiment can be realized by a sensor using a piezoelectric element, for example.

  In this embodiment, since the measuring device 100 includes the force detection frame 5 described above, X, Y, and Z directions generated in the spindle 4 held in the vertical direction at the center of the force detection frame 5 are obtained. It is possible to detect vibration precisely. The vibrations detected by the vibration sensors are independent from each other and are not affected by vibrations in other orthogonal directions. Therefore, it is possible to accurately detect vibrations in the X, Y, and Z directions orthogonal to each other.

  The force detection frame 5 is arranged in order from the inside to the outside so that the first holding frame 15, the second holding frames 16, 16 ', and the third holding frame 17 spread in the horizontal direction. The overall structure of the force detection frame 5 extends in the horizontal direction, but is thin in the vertical direction. Therefore, by using this force detection frame 5, it is possible to construct the measuring device 100 as a device with a reduced height.

  Next, the tire load device 200 will be described in detail with reference to FIGS. 1 and 2. The tire load device 200 includes a base 40 installed on the machine base 7. 1 and 2, the base 40 is a block that is long in the left-right direction (direction approaching or moving away from the measuring device 100), and a pair of guide rails 41 extending in the longitudinal direction are fixed to the front side and the back side on the upper surface. Has been. A sliding mechanism 42 that slides on the guide rail 41 in the left-right direction (left-right direction in FIGS. 1 and 2) is provided. The sliding mechanism 42 is provided on the lower surface side of the mounting plate 43, the four slide legs 44 that are engaged with the guide rail 41, and for moving the mounting plate 43 in the left-right direction. Motor 45, feed screw 56 and feed nut 57. The motor 45 is fixed to the base 40 by an attachment member 46.

  A spindle 47 is fixed on the mounting plate 43. The spindle 47 includes a rotation shaft 48 as a load rotation shaft extending upward (vertically upward), and a drum 49 is mounted on the upper end of the rotation shaft 48. The drum 49 has a flat peripheral surface and has a predetermined diameter. The drum 49 applies a load to the tire 10 of the wheel with tire 1 as a substitute road surface and rotates the wheel with tire 1.

  When the feed screw 56 is rotated by the motor 45, the feed nut 57 moves to the right, and the mounting plate 43 fixed to the feed nut 57 moves to the right. As a result, the spindle 47, the rotation shaft 48 and the drum 49 fixed on the mounting plate 43 move in the right direction, and the drum 49 is pressed against the tire 10. Further, when the motor 45 rotates in the reverse direction, the mounting plate 43 moves leftward, and the drum 49 is separated from the tire 10.

A sensor 50 is provided between the feed nut 57 and the mounting plate 43 so that the pressing force of the drum 49 pressed against the tire 10 by the sensor 50 can be detected.
The sliding mechanism 42 is further provided with a motor 51. In the motor 51, a pulley 52 is fitted on a rotating shaft that protrudes upward from the mounting plate 43. A pulley 53 is also fitted on the rotary shaft 48 on a concentric circle. The pulleys 52 and 53 are connected by a belt 54. Accordingly, the rotational force of the motor 51 is transmitted to the rotary shaft 48 via the belt 54, and the drum 49 is rotated at a predetermined rotational speed by rotating the rotary shaft 48.

  When the drum 49 is pressed against the tire 10 and rotated, the tire-equipped wheel 1 is rotated while a constant load is applied to the tire 10. The base 40 is provided with a sliding fixing device 55, and when the drum 49 generates an appropriate pressing force against the tire 10, the inter-axis distance between the rotating shaft 48 and the spindle 4. Can be held.

By rotating the tire-equipped wheel 1 while pressing the drum 49 with a predetermined force, the vibration generated at that time is detected by the aforementioned vibration sensors 31, 32, 33, 34, 11, 12, 11 ', 12'. It is possible to measure the uniformity of the wheel with tire 1.
Further, when the drum 49 is separated from the tire 10 from the state where the wheel with tire 1 is being rotated, the wheel with tire 1 is further rotated by inertial force thereafter. At the time of rotation, it is possible to calculate the dynamic imbalance of the tire-equipped wheel 1 based on the detection outputs of the vibration sensors 31, 32, 11, 12, 11 ', and 12'. A technique relating to the calculation of the dynamic imbalance itself is known, for example, from Japanese Examined Patent Publication No. 62-10373.

As described above, in this embodiment, the measurement device 100 can perform the uniformity and unbalance measurement of the tire-equipped wheel 1 with exactly the same configuration.
In addition, since the tire load device 200 can be installed on the machine base 7 in parallel with the measuring device 100, the size in the height direction of the entire device can be reduced, and a compact configuration can be achieved.

  The present invention is not limited to the embodiment described above, and various modifications can be made within the scope of the claims.

It is a front view of the testing device of the wheel with a tire for vehicles concerning one embodiment of this invention. It is a top view of the testing device of the wheel with a tire for vehicles concerning one embodiment of this invention. It is a perspective view of a force detection frame.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Wheel with tire for motor vehicles 2 Wheel 3 Chuck apparatus 4 Spindle 5 Force detection frame 10 Tire 11, 11 ', 12, 12', 31, 32, 33, 34 Vibration sensor 14 Hole 15 1st holding frame 16, 16 ' Second holding frame 17 Third holding frame 44 Sliding mechanism 47 Spindle 48 Rotating shaft 49 Drum 100 Measuring device 200 Tire load device

Claims (4)

A mounting device for mounting the tire wheel in a horizontal direction;
A rotating shaft for measurement extending vertically downward from the mounting device;
A holding means for holding the measurement rotating shaft so as to vibrate.
A first holding frame that holds the measurement rotary shaft in a vertical direction and holds the measurement rotary shaft in a horizontal X direction so as to vibrate;
A second holding frame that holds the first holding frame so as to vibrate in a horizontal Y direction orthogonal to the X direction;
A third holding frame that holds the second holding frame so as to be able to vibrate in a vertical direction orthogonal to the X direction and the Y direction;
A first sensor for detecting vibration of the first holding frame;
A second sensor for detecting vibration of the second holding frame;
A third sensor for detecting vibration of the third holding frame;
Means for calculating the uniformity and / or dynamic balance of the wheel with tires based on the outputs of the first, second and third sensors;
A tire load device that is pressed against and rotated by a tire of a tire-equipped wheel attached to the attachment device, and that can be switched between a state in which the tire-equipped wheel is rotated and a state apart from the tire,
An apparatus for testing wheels with tires for automobiles, comprising:   The first holding frame, the second holding frame, and the third holding frame extend in the horizontal direction, and are arranged in the order of the first holding frame, the second holding frame, and the third holding frame from the inside. The test apparatus for a wheel with a tire for an automobile according to claim 1, wherein: The third holding frame is configured such that a center position seen in the Y direction can swing around an axis in the X direction,
3. The test apparatus for a wheel with a tire for an automobile according to claim 2, wherein the third sensor is provided near both ends of the third holding frame in the Y direction. 4. The tire load device is:
A load rotary shaft extending in a vertical direction in parallel with the measurement rotary shaft;
A rotating drum attached to the rotating shaft for load, having a predetermined diameter, and having a circumferential surface pressed against the tire;
Means for moving the load rotating shaft in a horizontal direction;
The test apparatus for wheels with tires for automobiles according to any one of claims 1 to 3, characterized by comprising:

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