JP2007003416A - Tire testing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tire testing machine capable of measuring dynamic characteristics of a plurality of tires at once, and capable of enhancing precision of a result of the dynamic characteristic of the measured tire. <P>SOLUTION: This tire testing machine 1-1 for measuring the dynamic characteristic of the tire is provided with a driving roller 2 rotated by a motor 22, driven rollers 3, 4 rotated together with the rotation of the driving roller 2, an endless belt 5 laid woundly over on the driving roller 2 and the driven rollers 3, 4, and a tire contact means (the first tire support device 6, the second tire support device 7, a support block 8) for supporting rotatably the plurality of tires T1, T2, and for bringing the plurality of tires T1, T2 into contact respectively with both faces (outer circumferential face 51, inner circumferential face 52) of the endless belt 5. A load is supported mutually by the paired tires T1, T2 contacting with the both faces of the endless belt 5. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a tire testing machine, and more particularly to a tire testing apparatus for measuring dynamic characteristics of a tire.

  Generally, a tire bench test is performed to measure the dynamic characteristics of a tire (including a pneumatic tire), for example, the durability of the tire. For this bench test, a tire testing machine is used. As this tire testing machine, there are mainly a drum type tire testing machine and a belt type tire testing machine.

  The drum-type tire testing machine measures the dynamic characteristics of a tire by bringing a rotating tire in contact with a tire support device into contact with a rotating drum. This drum-type tire testing machine can bring a plurality of tires into contact with one rotating drum. Therefore, there is an advantage that the dynamic characteristics of a plurality of tires can be measured at a time. However, in this drum type tire testing machine, since the drum has a curvature, the tire comes into contact with the curved surface, and there are cases where the tire contacts the actual road surface, the tire contact shape, the tire contact pressure distribution, etc. Different. Therefore, the drum type tire testing machine has a problem that it is difficult to reproduce the same situation as when the tire rolls on an actual road surface, and the accuracy of the result of the measured dynamic characteristics of the tire is low.

  On the other hand, as shown in Patent Document 1, the belt type tire testing machine is rotatably supported by a tire support device on an endless belt wound between a driving roller rotated by a driving means and one driven roller. By contacting the tire, the dynamic characteristics of the tire are measured. In this belt type tire testing machine, since the endless belt between the driving roller and the driven roller is flat, the tire is in contact with a flat surface, and the tire is in contact with the actual road surface, The tire contact pressure distribution is approximated. Therefore, the belt-type tire testing machine has the advantage that the same situation as when the tire rolls on the actual road surface can be reproduced, and the result of the measured dynamic characteristics of the tire is high. However, in this belt-type tire testing machine, in order to suppress bending of the endless belt when a load is applied to the tire, the fluid bearing device is disposed at a position facing the tire that contacts the endless belt and the endless belt. Has been placed. Therefore, the belt type tire testing machine has a problem that it is difficult to measure the dynamic characteristics of a plurality of tires at a time because it is difficult to bring a plurality of tires into contact with an endless belt.

JP 2004-191108 A

  Therefore, the present invention has been made in view of the above, and can measure the dynamic characteristics of a plurality of tires at the same time and improve the accuracy of the results of the measured dynamic characteristics of the tires. An object of the present invention is to provide a tire testing machine that can be used.

  In order to solve the above-described problems and achieve the object, the present invention provides a tire testing machine for measuring dynamic characteristics of a tire, a driving roller that is rotated by driving means, and a plurality of rollers that rotate with the rotation of the driving roller. A driven roller, an endless belt wound around the driving roller and the plurality of driven rollers, at least a plurality of the tires rotatably supported, and the plurality of tires on each of both surfaces of the endless belt. Tire contacting means to be contacted.

  Also, in the present invention, in the tire testing machine, the tire contact means makes the plurality of tires contact each of both surfaces of the endless belt so as to face each other with the endless belt interposed therebetween. .

  According to these inventions, the tire contact means brings one end of the endless belt into contact with the tire whose dynamic characteristics are to be measured, and the tire in contact with the one side of the other side and the endless belt. A tire is brought into contact with a position opposite to each other. Therefore, the tire contact means can bring the tire into contact with both surfaces of the endless belt so as to be paired with the endless belt interposed therebetween. Thereby, the dynamic characteristics of a plurality of tires can be measured at a time.

  Further, the other tire can support a load applied to one of the paired tires via the endless belt. That is, the paired tires can support the load applied to each of the paired tires. Therefore, the endless belt can be prevented from being bent, and the flatness of the endless belt can be maintained. This allows the paired tires to come into contact with the flat surface, which can reproduce the same situation as a tire rolling on an actual road surface, improving the accuracy of the measured tire dynamic characteristics results can do.

  According to the present invention, in the tire testing machine, the tire contact means includes load changing means for changing a load applied to the plurality of tires, and the load changing means includes the plurality of endless belts. The load applied to the plurality of tires is changed according to the flatness of the portion in contact with the tire.

  According to the present invention, the load changing means improves the flatness of the endless belt when the flatness of the endless belt in the endless belt where the plurality of tires contact decreases, that is, when the flatness is not flat. Thus, the load applied to the plurality of tires can be changed. Therefore, even when a pair of tires having different sizes are in contact with the endless belt, the endless belt can be prevented from being curved, and the flatness of the endless belt can be maintained. Thereby, the precision of the result of the measured dynamic characteristic of the tire can be improved.

  According to the present invention, in the tire testing machine, the tire contact means includes slip angle changing means for changing slip angles of the plurality of tires, and the slip angle changing means acts on the endless belt. The slip angle of the plurality of tires is changed in accordance with the belt lateral force in the short direction of the endless belt.

  According to the present invention, in the tire testing machine, the tire contact means includes a camber angle changing means for changing a camber angle of the plurality of tires, and the camber angle changing means acts on the endless belt. The camber angles of the plurality of tires are changed in accordance with the belt lateral force.

  According to these inventions, the slip angle changing means or the camber angle changing means generates the belt lateral force when the belt lateral force is generated in one of the endless belts in the short direction of the endless belt. The slip angle or camber angle of a plurality of tires can be changed so as to be eliminated. Therefore, it is possible to suppress the endless belt from being detached from the wound rollers by the generated belt lateral force. Thereby, it is possible to reliably maintain the rolling of the plurality of tires in contact with the endless belt during measurement of the dynamic characteristics of the tire.

  According to the tire testing machine of the present invention, the belt type tire testing machine can measure the dynamic characteristics of a plurality of tires at the same time, and the accuracy of the results of the measured dynamic characteristics of the tires. The effect that can be improved.

  Hereinafter, the present invention will be described in detail with reference to the drawings. The present invention is not limited to the best mode for carrying out the invention. In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art or those that are substantially the same.

  FIG. 1 is a diagram illustrating a configuration example of the tire testing machine according to the first embodiment. FIG. 2-1 is a diagram illustrating an example of a pair of tires in contact with an endless belt. FIG. 2-2 is a diagram illustrating an example of a pair of tires in contact with an endless belt. FIG. 3-2 is a diagram illustrating an example of a pair of tires having a slip angle. FIG. 3-2 is a diagram illustrating an example of a pair of tires having a camber angle. FIG. 4A is a diagram illustrating a curved endless belt. FIG. 4-2 is a diagram illustrating a flat endless belt.

  The tire testing machine 1-1 measures tire dynamic characteristics by rolling tires (in this embodiment, tires T1 and T2). Here, the tire dynamic characteristics include, for example, tire durability, tire wear characteristics, wear characteristics, tire turning characteristics (cornering characteristics), and the like. The tire testing machine 1-1 includes a drive roller 2, a plurality of driven rollers 3 and 4, an endless belt 5, tire contact means (a first tire support device 6, a second tire support device 7, and a support base 8). , And the control device 9.

  The drive roller 2 is for moving the endless belt 5 in the traveling direction, and is connected by a drive shaft 21 to a drive motor 22 as drive means. Accordingly, the drive roller 2 is rotated in the direction of arrow A by the drive motor 22. The drive motor 22 is controlled in operation, stop, rotational speed, and the like by a drive motor control signal output from the control device 9.

  The plurality of driven rollers 3 and 4 are rotatably supported by rotating shafts 31 and 41, respectively. The plurality of driven rollers 3 and 4 receive the rotational force of the driving roller 2 through the endless belt 5 and rotate in the direction indicated by arrows B and C in the figure, respectively.

  The endless belt 5 is wound around the driving roller 2 and the plurality of driven rollers 3 and 4, and tires T <b> 1 and T <b> 2 for measuring dynamic characteristics are in contact with the outer peripheral surface 51 and the inner peripheral surface 52, respectively. The tires T1 and T2 are rolled. That is, the endless belt 5 serves as a road surface when the tires T1 and T2 are actually mounted on the vehicle. The endless belt 5 moves in the advancing direction when the driving roller 2 rotates in the direction of arrow A in the figure.

  Here, the endless belt 5 is wound around three rollers including the driving roller 2. Accordingly, the range surrounded by the inner peripheral surface 52 of the endless belt 5 can be widened as compared with the case where the belt is wound around one drive roller and one driven roller. Thereby, the space which installs the 2nd tire support apparatus 7 which makes this endless belt 5 contact tire T2 from the inner side of endless belt 5 among tire contact means is securable.

  The tire contact means causes the tires T1 and T2 to come into contact with both surfaces of the endless belt 5, and the endless belt 5 moves in the traveling direction to roll in the D1 direction and D2 direction, respectively. The first tire support device 6 and the second tire support device 7 constituting the tire contact means are arranged so as to face each other across the endless belt 5 between the driven rollers 3 and 4 via the support base 8. Yes. The first tire support device 6 and the second tire support device 7 rotate and support the tires T1 and T2 so that the tires T1 and T2 are opposed to each other with the endless belt 5 interposed therebetween.

  The first tire support device 6 makes the tire T1 contact the outer peripheral surface 51 of the endless belt 5. The first tire support device 6 includes a tire rotation shaft 61, a first shaft 62, a second shaft 63, a support member 64, a slip angle changing means 65, a camber angle changing means 66, a load changing means 67, and a six component force sensor. 68.

  The tire rotation shaft 61 rotatably supports the tire T <b> 1 and is connected to the first shaft 62. The first shaft 62 is rotatably supported by the slip angle changing means 65 with respect to the second shaft 63. The second shaft 63 is rotatably supported with respect to the support member 64 by the camber angle changing means 66. The support member 64 is supported so as to be movable in the tire radial direction perpendicular to the endless belt 5 (hereinafter simply referred to as “vertical direction”) with respect to the support base 8.

  The slip angle changing means 65 includes, for example, a motor, and changes the slip angle of the tire T1 by rotating the first shaft 62 in the direction of arrow G1 in the figure. The slip angle changing means 65 controls the magnitude and direction of the slip angle of the tire T1 based on the first slip angle control signal output from the control device 9. The camber angle changing means 66 includes, for example, a motor and the like, and changes the camber angle of the tire T1 by rotating the second shaft 63 in the direction of arrow E1 in the figure. The camber angle changing means 66 controls the size and direction of the camber angle of the tire T1 based on the first camber angle control signal output from the control device 9.

  Here, the load changing unit 67 includes, for example, a motor, and moves the support member 64 in the vertical direction with respect to the support base 8 to thereby determine the load F1 applied to the tire T1 and the position of the tire rotation shaft 61 in the vertical direction. To change. The load changing unit 67 controls the magnitude of the load F1 applied to the tire T1 by the first load control signal output from the control device 9. The 6-component force sensor 68 detects three orthogonal forces (X axis direction, Y axis direction, Z axis direction) and three rotational forces (around the X axis, around the Y axis, and around the Z axis) acting on the tire T1. Are output to the control device 9. Based on the three orthogonal force and three rotational force data output from the six component force sensor 68, the control device 9 determines the load F1 applied to the tire T1 and the cornering force generated in the tire T1 (hereinafter simply “CF”). And so on).

  The second tire support device 7 makes the tire T2 contact the inner peripheral surface 52 of the endless belt 5. The second tire support device 7 includes a tire rotation shaft 71, a first shaft 72, a second shaft 73, a support member 74, a slip angle changing means 75, a camber angle changing means 76, a load changing means 77, and a six component force sensor. 78.

  The tire rotation shaft 71 rotatably supports the tire T <b> 2 and is connected to the first shaft 72. The first shaft 72 is supported by the slip angle changing means 75 so as to be rotatable with respect to the second shaft 73. The second shaft 73 is rotatably supported with respect to the support member 74 by the camber angle changing means 76. The support member 74 is supported so as to be movable in the vertical direction with respect to the support base 8.

  The slip angle changing means 75 includes, for example, a motor or the like, and changes the slip angle of the tire T2 by rotating the first shaft 72 in the arrow G2 direction. The slip angle changing means 75 controls the magnitude and direction of the slip angle of the tire T2 based on the second slip angle control signal output from the control device 9. The camber angle changing means 76 includes a motor, for example, and changes the slip angle of the tire T2 by rotating the second shaft 73 in the direction of arrow E2 in the figure. The camber angle changing means 76 controls the magnitude and direction of the camber angle of the tire T2 by the second camber angle control signal output from the control device 9.

  Here, the load changing unit 77 includes, for example, a motor or the like, and moves the support member 74 in the vertical direction with respect to the support base 8 to thereby determine the load F2 applied to the tire T2 and the position of the tire rotation shaft 71 in the vertical direction. To change. The load changing unit 77 controls the magnitude of the load F2 applied to the tire T2 by the second load control signal output from the control device 9. The six component force sensor 78 detects three orthogonal forces and three rotational forces acting on the tire T2 and outputs them to the control device 9. The control device 9 acquires the load F2 applied to the tire T2, the CF generated in the tire T2, and the like based on the three orthogonal force and three rotational force data output from the six component force sensor 78.

  Reference numeral 81 denotes a displacement sensor that detects the displacement of the endless belt 5 in the vertical direction between the driven rollers 3 and 4 and outputs the detected displacement to the control device 9. The control device 9 acquires the flatness of the endless belt 5 based on the displacement output from the displacement sensor 81.

  The control device 9 controls the tire testing machine 1-1 according to the first embodiment, and includes an input / output port (I / O) (not shown), a processing unit, a storage unit, and the like. An input / output device (not shown) is connected to the control device 9. This input / output device is provided with an input means and an output means, and inputs the test condition data necessary for measuring the dynamic characteristics of the tires T1 and T2 to the control device 9 by this input means. .

  In the control device 9, a processing unit (not shown) outputs a drive motor control signal based on the test condition data and other data input by the input / output device, rotates the drive roller 2, and advances the endless belt 5. Move in the direction. The control device 9 outputs the first and second load control signals, the first and second slip angle control signals, and the first and second camber angle control signals, and loads F1 and F2 and slips on the tires T1 and T2. An angle and a camber angle are given, and both sides of the endless belt 5 are brought into contact with each other.

  For example, when the test conditions are the same for tires T1 and T2, the same air pressure, the same loads F1 and F2, and the slip angle and camber angle are both 0 degrees, as shown in FIGS. The first tire support device 6 brings the tire T1 into contact with the outer peripheral surface 51 of the endless belt 5, and the second tire support device 7 sandwiches the endless belt 5 with the tire T1 in contact with the outer peripheral surface 51 of the inner peripheral surface 52. The tire T2 also comes into contact with the opposite position. Accordingly, the tires T1 and T2 can be brought into contact with both surfaces of the endless belt 5 so as to be paired with the endless belt 5 interposed therebetween. Thereby, the dynamic characteristics of a plurality of tires can be measured at a time.

  In addition, since the position where the tire T1 contacts the outer peripheral surface 51 of the endless belt 5 and the position where the tire T2 contacts the inner peripheral surface 52 of the endless belt 5 overlap in the vertical direction, one pair of tires T1, T2 The other tires T2 and T1 can support the load applied to. That is, the paired tires T1 and T2 can support the load applied to each of the paired tires T1 and T2. Therefore, the endless belt 5 can be prevented from being bent, and the flatness of the endless belt 5 can be maintained during the measurement of the dynamic characteristics of the tires T1 and T2. As a result, the paired tires T1 and T2 come into contact with the flat surface, and the same situation as when the tires T1 and T2 roll on the actual road surface can be reproduced. The accuracy of the result of the dynamic characteristic can be improved.

  The first tire support device 6 and the second tire support device 7 that are tire contact means contact the tires T1 and T2 constituting one pair respectively on both surfaces of the endless belt 5, It is not limited to this. For example, a plurality of tires may be brought into contact with both surfaces of the endless belt 5 as shown in FIG. In the figure, the first tire support device 6 may rotatably support the two tires T1 and T3, and the second tire support device 7 may rotatably support the two tires T2 and T4. Thereby, the tire testing machine 1-1 can make four tires T1-T4 contact both surfaces of the endless belt 5. FIG. Note that the first tire support device 6 and the second tire support device 7 may be configured to independently change the load, slip angle, and camber angle of the two tires T1 to T4. When measuring the dynamic characteristics of a plurality of tires, it is preferable to provide a 6-component force sensor corresponding to each tire.

  Moreover, even if the same orientation θ (θ ≠ 0) with respect to the surface of the endless belt 5 contacting the slip angles of the tires T1 and T2 among the above test conditions, as shown in FIG. 3-1, the first tire support device 6 is in contact with the tire T1 on the outer peripheral surface 51 of the endless belt 5, and the second tire support device 7 is in a position facing the tire T1 in contact with the outer peripheral surface 51 of the inner peripheral surface 52 across the endless belt 5. The tire T2 can also contact. Therefore, the dynamic characteristics of a plurality of tires can be measured at a time, and the accuracy of the results of the measured dynamic characteristics of the tires T1 and T2 can be improved.

  Here, the tire T1 rolls as the endless belt 5 moves in the traveling direction, and a cornering force (hereinafter simply referred to as “CF”) extends in one of the short directions of the endless belt 5. It acts on the belt 5. The tire T2 rolls as the endless belt 5 moves in the traveling direction, and a CF having the same size as the CF by the tire T1 in the other direction of the short end direction of the endless belt 5 with respect to the endless belt 5 Act. Accordingly, the CFs acting on the endless belt 5 by the tires T1 and T2 have the same size and the opposite directions. Therefore, the endless belt 5 does not generate belt lateral force in the short direction of the endless belt 5. . Thereby, it can suppress that this endless belt 5 remove | deviates from each roller wound, and the rolling of tire T1, T2 during the measurement of the dynamic characteristic by the tire testing machine 1-1 is maintained reliably. be able to.

  Further, even if the camber angles of the tires T1 and T2 in the above test conditions are set to the same direction δ (δ ≠ 0) with respect to the surface of the endless belt 5 in contact with each other, as shown in FIG. 6 is in contact with the tire T1 on the outer peripheral surface 51 of the endless belt 5, and the second tire support device 7 is in a position facing the tire T1 in contact with the outer peripheral surface 51 of the inner peripheral surface 52 across the endless belt 5. The tire T2 can also contact. Therefore, the dynamic characteristics of a plurality of tires can be measured at a time, and the accuracy of the results of the measured dynamic characteristics of the tires T1 and T2 can be improved. The tires T1 and T2 slightly move in the short direction of the endless belt 5 when the camber angle is δ. Therefore, it is preferable that the first tire support device 6 and the second tire support device 7 which are tire contact means can move in the short direction of the endless belt 5. Thereby, the shift | offset | difference in the perpendicular direction of the position in the transversal direction of this endless belt 5 which tire T1, T2 contacts with the endless belt 5 can be corrected.

  Further, in the tire testing machine 1-1, for example, when measuring the dynamic characteristics of the tires T5 and T6 that are different in size, even if the loads F3 and F4 are the same, the arrow H in FIG. As shown, there is a possibility that the endless belt 5 is curved. This is because the tires T5 and T6, which are pairs of different sizes, have different load radii even if the loads F3 and F4 are the same. As described above, when the endless belt 5 is curved, the displacement sensor 81 detects the displacement in the vertical direction and outputs the detected displacement to the control device 9. The control device 9 acquires the flatness of the endless belt 5 between the driven rollers 3 and 4 based on the detected displacement.

  When the control device 9 determines that the endless belt 5 of the endless belt 5 in contact with the paired tires T5 and T6 is not flat (for example, the flatness is equal to or lower than a predetermined value), the endless belt 5 First and second load control signals are output to the load changing means 67 of the first tire support device 6 and the load changing means 68 of the second tire support device 7 so that the belt 5 becomes flat, and paired. The loads F3 and F4 applied to the tires T5 and T6 are changed. Therefore, it is possible to suppress the bending of the endless belt 5 and to maintain the flatness of the endless belt 5 as shown in FIG. Thereby, the precision of the result of the measured dynamic characteristic of tire T5, T6 can be improved.

  In addition, since the position where the tire T1 contacts the outer peripheral surface 51 of the endless belt 5 and the position where the tire T2 contacts the inner peripheral surface 52 of the endless belt 5 overlap in the vertical direction, one pair of tires T1, T2 The other tires T2 and T1 can support the load applied to. That is, the paired tires T1 and T2 can support the load applied to each of the paired tires T1 and T2. Therefore, the endless belt 5 can be prevented from being bent, and the flatness of the endless belt 5 can be maintained during the measurement of the dynamic characteristics of the tires T1 and T2. As a result, the paired tires T1 and T2 come into contact with the flat surface, and the same situation as when the tires T1 and T2 roll on the actual road surface can be reproduced. The accuracy of the result of the dynamic characteristic can be improved.

  Further, in the tire testing machine 1-1, for example, as shown in FIG. 5-1, when measuring the dynamic characteristics of the eight tires T7 to T14, the slip angles of all the tires T7 to T14 are set. Regardless of the surface of the endless belt 5 that is in contact, assuming that the same direction θ (θ ≠ 0) with respect to one surface of the endless belt 5, all tires T7 to T14 that are in contact with both surfaces of the endless belt 5 The CF having the same size in one direction of the short direction of the belt 5 acts on the endless belt 5. Therefore, the endless belt 5 generates a force K1 in one direction of the short side direction of the endless belt 5, and this force K1 becomes a belt lateral force and comes off from each roller around which the endless belt 5 is wound. There is a fear.

The control device 9 acquires the size and direction of each CF by each tire T7 to T14 based on the output of a 6 component force sensor provided corresponding to each tire T4 to T14. Next, the belt lateral force is calculated from the total of the CFs obtained by the acquired tires T7 to T14, so that the belt lateral force is not generated, that is, the forces acting in both directions in the short direction of the endless belt 5 are balanced. In addition, a slip angle control signal is output to slip angle changing means provided corresponding to each tire T4 to T14, and the direction of the slip angle of each tire T7 to T14 is changed.

  For example, the tires to be paired have the same slip angle direction with respect to one surface of the endless belt 5, and the slip angle directions of the tires T7 to T14 are changed so that no belt lateral force is generated. In this case, as shown in FIG. 5B, the slip angle of the tires T7 to T10 located on the side opposite to the traveling direction side of the endless belt 5, and the slip of the tires T11 to T14 located on the traveling direction side of the endless belt 5 The direction of the slip angle of each tire T7 to T14 may be changed so that the angle is the same θ and the direction is the opposite side. As a result, in the short direction of the endless belt 5, the same magnitude force K <b> 2 acts in both directions, so that no belt lateral force is generated.

  Further, as shown in FIGS. 5-3 and 5-4, the slip angle and endlessness of the paired tires T7, T8 and the paired tires T9, T10 located on the opposite side of the traveling direction side of the endless belt 5 The tires T7, T12 and the paired tires T13, T14 located on the traveling direction side of the belt 5 have the same angle θ and the opposite direction of each tire T7. The direction of the slip angle of T14 may be changed. As a result, in the short direction of the endless belt 5, the same magnitude force K <b> 2 acts in both directions, so that no belt lateral force is generated.

  As described above, when the belt lateral force is generated in the endless belt 5 in any one of the short sides of the endless belt 5, the slip angle changing means prevents the belt lateral force from being generated. The slip angle of T14 can be changed. Therefore, it is possible to suppress the endless belt 5 from being detached from the wound rollers by the generated belt lateral force. Thereby, rolling of tire T7-14 which contacts endless belt 5 during measurement of dynamic characteristics of tire T7-T14 can be maintained reliably.

  Even when a plurality of tires having camber angles are in contact with both surfaces of the endless belt 5, force is generated in the endless belt in any one of the short directions of the endless belt 5. This force becomes a belt lateral force, and there is a possibility that the endless belt 5 may come off from each of the wound rollers. In this case, when a belt lateral force is generated in either one of the endless belts 5 in the short direction, the camber angle changing means includes a plurality of camber angle changing means so that the belt lateral force is not generated. It is preferable to change the camber angle of the tire. Thereby, it is possible to reliably maintain the rolling of the plurality of tires in contact with the endless belt 5 during the measurement of the dynamic characteristics of the tire.

  FIG. 6 is a diagram illustrating a configuration example of the tire testing machine according to the second embodiment. As shown in the figure, the tire testing machine 1-2 according to the second embodiment includes a driving roller 2, an endless belt 5, driven roller groups 11 to 13 including a plurality of driven rollers, and tire contact (not shown). 1 (the tire contact means shown in FIG. 1 has the same basic configuration). This tire contact means brings the pair of tires T1, T2 into contact with both surfaces of the endless belt 5 between the driven roller groups 11 and 12 so as to contact with both surfaces of the endless belt 5 between the driven roller groups 12 and 13. The tires T3 and T4 are brought into contact with each other. As described above, the plurality of tires may not be brought into contact with each other only in one of the endless belts 5 between adjacent rollers existing in a plurality of places.

  As described above, the tire testing machine according to the present invention is useful when measuring the dynamic characteristics of a tire, and in particular, can measure the dynamic characteristics of a plurality of tires at the same time, Suitable for improving the accuracy of the result of the dynamic properties of the finished tire.

It is a figure which shows the structural example of the tire testing machine concerning Example 1. FIG. It is a figure which shows an example of the tire used as the pair which contacted the endless belt. It is a figure which shows an example of the tire used as the pair which contacted the endless belt. It is a figure which shows an example of the tire which becomes a pair which has a slip angle. It is a figure which shows an example of the tire which becomes a pair which has a camber angle. It is a figure which shows the curved endless belt. It is a figure which shows a flat endless belt. It is a figure which shows the slip angle of each tire which belt lateral force generate | occur | produces. It is a figure which shows the example of a change of a slip angle. It is a figure which shows the example of a change of a slip angle. It is a figure which shows the example of a change of a slip angle. It is a figure which shows the structural example of the tire testing machine concerning Example 2. FIG.

Explanation of symbols

1-1, 1-2 Tire testing machine 2 Drive roller 3 Driven roller 4 Driven roller 5 Endless belt 6 First tire support device 65 Slip angle change means 66 Camber angle change means 67 Load change means 7 First tire support device 75 Slip Angle changing means 76 Camber angle changing means 77 Load changing means 8 Support base 9 Controller 11 to 13 Driven roller

Claims (5)

In a tire testing machine that measures the dynamic characteristics of a tire,
A drive roller that is rotated by drive means;
A plurality of driven rollers that rotate with the rotation of the drive roller;
An endless belt wound around the drive roller and the plurality of driven rollers;
Tire contact means for rotatably supporting at least a plurality of the tires and contacting the plurality of tires on both sides of the endless belt;
A tire testing machine comprising:   2. The tire testing machine according to claim 1, wherein the tire contact means makes the plurality of tires contact each of both surfaces of the endless belt so as to face each other with the endless belt interposed therebetween. The tire contact means includes load changing means for changing a load applied to the plurality of tires,
The load changing means changes the load applied to the plurality of tires in accordance with the flatness of a portion of the endless belt that is in contact with the plurality of tires. Tire testing machine. The tire contact means includes slip angle changing means for changing slip angles of the plurality of tires,
The slip angle changing means changes the slip angle of the plurality of tires according to a lateral belt force in a short direction of the endless belt acting on the endless belt. The tire testing machine as described in any one. The tire contact means includes a camber angle changing means for changing a camber angle of the plurality of tires,
5. The camber angle changing means changes the camber angles of the plurality of tires according to the belt lateral force acting on the endless belt. 6. Tire testing machine.

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