JP4162555B2 - Uniformity and / or dynamic balance testing equipment for wheeled tires - Google Patents

Description

  The present invention relates to a uniformity and / or dynamic balance test apparatus for tires with wheels.

  Conventionally, a dynamic balance test for measuring an eccentric state of a tire and a uniformity test for measuring a variation in force generated by a rotating tire are known. In the dynamic balance test, the eccentricity of the tire is detected from the change in the vibration state when the tire is rotated. In the uniformity test, the tire is rotated with the rotating drum pressed against the outer peripheral surface of the tire, and load fluctuations in the radial direction and the thrust direction of the tire are measured.

  As a test apparatus for performing the uniformity test and the dynamic balance test, for example, there is a test apparatus described in Patent Document 1. The test apparatus described in the above publication attaches a tire to a spindle that is rotatably supported via a bearing in a spindle housing, and rotates the tire at a predetermined rotational speed.

  Here, the test apparatus of Patent Document 1 places a wheel on a wheel mount provided at one end of a spindle. The wheel mount protrudes perpendicularly from the flat part that abuts the wheel, penetrates the hub hole of the wheel, and has a tapered cylinder or columnar shape with the rotation axis of the spindle as the central axis and the outer peripheral part becoming thinner as the distance from the flat part increases. Has a protrusion.

  Moreover, the test apparatus of patent document 1 has a top adapter which is a member for fixing a wheel. The top adapter has a collet member having a cylindrical portion whose outer diameter is slightly smaller than the diameter of the hub hole of the wheel. The inner periphery of the cylindrical portion of the collet member is formed as a tapered surface that becomes smaller as the distance from the plane portion of the wheel mount becomes smaller and has a gradient substantially equal to the gradient of the tapered portion of the protrusion of the wheel mount. The collet member has a plurality of slits formed in parallel to the central axis of the cylindrical portion, which extends from one end of the cylindrical portion of the collet member facing the plane portion of the wheel mount.

  Here, in the state where the inner periphery of the cylindrical portion of the collet member is in contact with the outer periphery of the protruding portion of the wheel mount, the collet member is further pushed toward the plane portion of the wheel mount, so that the slit is expanded and the cylindrical portion of the collet member By increasing the outer diameter to the diameter of the hub hole, the cylindrical portion of the collet member comes into contact with the hub hole. The wheeled tire is positioned at the position of the wheel when the cylindrical portion of the collet member comes into contact with the hub hole.

  The outer diameter of the cylindrical portion of the collet member increases while abutting against a tapered cylindrical or columnar protruding portion whose center is the rotation axis of the spindle and whose outer peripheral portion becomes thinner as the plane portion is separated from the cylindrical portion. ing. Therefore, even if the outer diameter of the collet member is in a state of being imaged, the central axis of the cylindrical portion of the collet member coincides with the rotation axis of the spindle. As a result, the central axis of the hub hole that contacts the cylindrical portion of the collet member also coincides with the rotational axis of the spindle. With the above configuration, the test apparatus disclosed in Patent Document 2 matches the center axis of the hub hole with the rotation axis of the spindle even when testing a tire having a variation in the diameter of the hub hole diameter of the tire. Thus, the tire can be attached to the spindle.

  In the test apparatus of Patent Document 1, the collet member and the hub hole are brought into contact with each other by elastically deforming the collet member. Therefore, the fluctuation range of the outer periphery of the cylindrical portion of the collet member is limited by the elastic deformation range of the material constituting the collet member. For this reason, when testing multiple types of tires with significantly different hub hole diameters in conventional test equipment, multiple types of collets are prepared according to the type of tire, and each time the type of tire changes, the collet The work of exchanging members was required. Therefore, in the conventional test apparatus, when a plurality of types of tires having significantly different hub hole diameters are tested, a significantly larger number of man-hours is required than when a single type of tire is tested.

Furthermore, in the test apparatus of Patent Document 1, each of the plurality of pins is engaged with a bolt hole of the wheel, and the pin is pressed and biased toward the spindle to fix the wheel on the spindle. . Therefore, the test apparatus of Patent Document 1 requires means for positioning in the tire circumferential direction so that the pins engage with the bolt holes, and depending on the shape of the wheel, the number and length of the pins, It was necessary to use top adapters with different positions.
JP2003-4597A

  In view of the circumstances as described above, the present invention can perform tests with the same man-hours as when testing a single type of tire, even when testing multiple types of tires with significantly different hub hole diameters. It is another object of the present invention to provide a wheel tire uniformity and / or dynamic balance testing apparatus.

  Another object of the present invention is to provide a wheel-equipped tire uniformity and / or dynamic balance testing apparatus that does not require means for positioning in the tire circumferential direction when fixing the tire on a spindle.

  In order to achieve the above object, the test apparatus of the present invention has a tapered cylindrical surface that is coaxial with the rotation axis of the spindle and whose outer diameter increases toward the other end of the spindle. An adapter member that relatively moves forward and backward on the rotation axis of the spindle, and at least three chuck claws that are movable in the radial direction of the spindle, each of which engages with the inner peripheral surface of the hub hole Each of the chuck claws is disposed between the tapered cylindrical surface and the hub hole when the adapter is inserted into the hub hole. When the rotation axis of the spindle passes through the center of the circle in contact with all of the engagement surfaces of the at least three chuck claws, the adapter member faces the one end of the spindle. A first urging means for urging, wherein the first urging means urges at least three chuck claws with a tapered cylindrical surface outward in the radial direction of the spindle so that the engagement surface of the hub hole is Having an inner peripheral surface engaged therewith.

  In addition, the test apparatus of the present invention includes an elastic member that presses and biases the wheel portion of the wheeled tire toward one end of the spindle with the wheeled tire sandwiched between one end of the spindle. In addition, a wheel mount having a flat surface portion on which the wheel is placed is formed at one end of the spindle, and the test apparatus passes through the hub hole of the wheel placed on the wheel mount and enters the wheel mount in the direction of the rotation axis of the spindle. And a third urging means formed integrally with the shaft. When the shaft is pulled into the wheel mount, the elastic member is sandwiched between the third urging means and the wheel. The wheel is pressed and urged by the repulsive force of the elastic member generated when the elastic member is sandwiched and compressed between the third urging means and the wheel. In addition, the test apparatus includes a pull-in control unit that adjusts the pull-in amount of the shaft in accordance with the contact position between the elastic member and the wheel.

  Therefore, according to the test apparatus of the present invention, the tire can be fixed to the spindle by engaging the advanceable / retractable chuck claw with the hub hole of the tire, so that a plurality of types of tires having greatly different hub hole diameters can be tested. Even in this case, it is not necessary to change the components of the apparatus. Further, according to the test apparatus of the present invention, the chuck claw is positioned at a position where the chuck claw contacts the tapered cylindrical surface of the adapter member coaxial with the rotation axis of the spindle. As a result, the engagement surface of the chuck claw that engages with the hub hole of the tire is arranged on a circumference centering on the rotation axis of the spindle. If the number of chuck claws is 3 or more, the circle on which the engagement surfaces of all chuck claws are arranged is uniquely determined. Therefore, according to the test apparatus of the present invention, the center axis of the tire hub hole is the spindle. The tire can be positioned so as to coincide with the rotation axis.

  Moreover, according to the test apparatus of this invention, it is set as the structure which fixes a tire to a spindle by pressing a wheel toward a spindle with an elastic member. Since the elastic member can be deformed and brought into close contact with the curved surface of the wheel to press the wheel, it is not necessary to perform positioning so that the elastic member comes to a specific part such as a bolt hole. In addition, according to the present invention, since the amount of shaft pull-in can be adjusted according to the contact position between the elastic member and the wheel, a plurality of contact positions in the rotation axis direction between the elastic member and the wheel are different. The same top adapter can be used for different types of tires.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a side view showing a basic configuration of a uniformity and dynamic balance combined testing apparatus 1 (hereinafter referred to as combined testing apparatus 1) according to an embodiment of the present invention. In the following description, “upper” and “lower” are defined as shown in FIG. 1. However, the configuration of the composite test apparatus 1 may be upside down or horizontally.

  The apparatus frame of the composite test apparatus 1 includes a base 50, a column 52 extending vertically upward from the base 50, and a top plate 54 supported by the column 52. A spindle 120 that holds and rotates the tire C with wheels and a spindle housing 110 that rotatably supports the spindle 120 are attached to the base 50. The spindle housing 110 is supported on the base 50 by a support shaft (not shown) extending from the apparatus frame of the composite test apparatus 1.

  The composite test apparatus 1 is configured to hold the tire C by chucking the wheel of the tire C. First, a configuration for supporting the tire C will be described.

  FIG. 2 is a cross-sectional view (a) and a front view (b) of a general tire C with a wheel. The wheeled tire C includes a tire portion T ′ and a wheel W. The wheel W includes a rim portion R for attaching a tire and a disc portion D attached to an axle hub or the like. A hub hole H is formed at the center of the disk portion D.

  FIG. 3 is a side sectional view of the spindle 120 and the spindle housing 110 when holding the tire C with wheels. The spindle housing 110 is a prismatic member, and a through-hole into which the double-row cylindrical roller bearings 112a and 112b and the combined angular ball bearing 113 can be mounted is drilled in the central thrust direction.

  The spindle 120 includes a hollow portion 120a and a bracket portion 120b. Further, the upper end of the bracket portion 120b of the spindle 120 protrudes in the horizontal direction to form a flange portion 120e. The spindle 120 is rotatably supported by the spindle housing 110 (via the double row cylindrical roller bearings 112a and 112b and the combined angular ball bearing 113). Here, the double-row cylindrical roller bearings 112a and 112b support the spindle shaft from the radial direction, and the combined angular ball bearing 113 supports the spindle shaft from both the radial and thrust directions.

  A drawing cylinder unit 600 is fixed to the flange portion 120e of the spindle 120 by a bolt (not shown). Further, a top adapter 500 is provided above the drawing cylinder unit 600. The top adapter 500 is pulled into the pull-in cylinder unit 600 and presses the chuck claw 616 for fixing the tire C against the hub hole H. Further, when the top adapter 500 is pulled, the wheel fixing cylinder 541 moves downward in the figure and the wheel W presses toward the spindle.

  FIG. 4 is a side sectional view of the top adapter 500 and the retracting cylinder unit 600. A chuck claw 616 that chucks the hub hole H of the wheel W of the wheeled tire C is provided at the upper end of the drawing cylinder unit 600. The chuck claw 616 protrudes from the upper surface of the retracting cylinder unit 600 by a predetermined amount, and engages with the hub hole H of the wheel W from the inside as indicated by a chain line in FIG. Here, a surface where the chuck claw 616 engages with the hub hole H is defined as an engagement surface 616a. The upper surface of the drawing cylinder unit 600 functions as a contact surface 603 that contacts the disk portion D of the wheel W of the wheeled tire C.

  FIG. 5 is a cross-sectional view of the upper spindle 11 along the A-A ′ cross section of FIG. 4. The chuck claw 616 is formed at the upper end of the drawing cylinder unit 600 and is slidably held inside a guide hole 661 extending radially from the rotation axis of the spindle 120. As a result, the chuck claw 616 can move in the radial direction of the spindle 120. Each chuck claw 616 is biased toward the central portion in the radial direction of the spindle 120 by a coil spring 665.

  Further, a shaft engaging hole 604 in which the insertion shaft 503 of the top adapter 500 is slidably mounted is formed in the central portion of the drawing cylinder unit 600 (FIG. 4). In attaching the tire C to the spindle 120, the wheeled tire C is installed on the contact surface 603 so that the hub hole H is located on the shaft engagement hole 604.

  The top adapter 500 includes a disc 502 and an insertion shaft 503 extending downward from the center of the disc 502. The insertion shaft 503 is inserted into the drawing cylinder unit 600 in the axial direction. The insertion shaft 503 is inserted into the retracting cylinder unit 600 so that the center axis of the insertion shaft 503 and the rotation axis of the spindle 120 coincide.

  Further, the insertion shaft 503 is sequentially inserted into the spring guide (upper) 532, the coil spring 533, the spring guide (lower) 531 and the adapter 534 from the top.

  Each of the spring guide (upper) 532 and the spring guide (lower) 531 is an annular member having a stepped outer periphery, and the outer diameter of the small diameter is equal to the inner diameter of the coil spring 533. The spring guide (upper) 532 and the spring guide (lower) 531 are coil springs so that the outer circumferences of the small diameter flanges of the spring guide (upper) 532 and the spring guide (lower) 531 are in contact with the inner circumference of the coil spring 533, respectively. 533 is inserted. In this state, both ends of the coil spring 533 are fixed to a spring guide (upper) 532 and a spring guide (lower) 531.

  Further, the upper surface of the spring guide (upper) 532 is fixed to the lower surface of the disc 502 of the top adapter 500. On the other hand, the spring guide (lower) 531 can move up and down while sliding with respect to the insertion shaft 503.

  The adapter 534 is a cylindrical member formed at the upper end of the tapered cylindrical surface 534a whose outer peripheral surface becomes narrower downward. The diameter of the inner circumference of the adapter 534 is equal to the diameter of the insertion shaft 503, and therefore the adapter 534 can move up and down while sliding with respect to the insertion shaft 503. The adapter 534 is positioned so that the center axis of the tapered cylindrical surface 534a of the adapter 534 coincides with the center axis of the insertion shaft 503.

  The adapter 534 is fixed to the lower surface of the spring guide (lower) 531. That is, the adapter 534 is suspended from the disc 502 of the top adapter 500 by the coil spring 533, the spring guide (upper) 532, and the spring guide (lower) 531.

  Furthermore, as shown in FIG. 4, a cylindrical mounting member 510 is formed above the disc 502 in order to raise and lower the top adapter 500 by the inserter unit 200. An engagement flange portion 520 that is engaged from the outside with the chuck claw 210 of the inserter unit 200 (FIG. 1) is provided at the tip of the mounting member 510.

  A wheel fixing cylinder 541 is fixed to the lower surface of the disc 502. The wheel fixing cylinder 540 is positioned and fixed so that its central axis coincides with the central axis of the shaft 503. A contact portion 542 made of hard rubber is formed at the lower end of the wheel fixed cylinder 541.

  Further, as shown in FIG. 3, in order to retract the insertion shaft 503 into the retracting cylinder unit 600, the air chamber 620 inside the retracting cylinder unit 600 is provided with a disk-like piston 610 that can slide in the axial direction. ing. Further, a guide shaft 613 that extends axially into the drawing cylinder unit 600 extends downward from the center of the piston 610 so that the piston 610 can slide in the axial direction of the spindle. The guide shaft 613 is slidably engaged with the guide shaft engagement hole 606 drilled in the lower surface of the retracting cylinder unit 600, so that the piston 610 is always kept substantially perpendicular to the central axis of the spindle 120. The tip of the guide shaft 613 passes through the guide shaft engagement hole 606 and is inserted into the bracket portion 120b of the spindle 120.

  Further, in order to move the piston 610 in the direction of the central axis of the spindle 120, an air path is supplied to the guide shaft 613 and the piston 610 from the bracket portion 120b of the spindle 120 to the portion 621 of the air chamber 620 above the piston 610. 614 is formed.

  Similarly, in order to move the piston 610 in the direction of the center axis of the spindle 120, air is supplied to the lower surface of the cylinder unit 600 from the air path 135 of the spindle 120 to the portion 622 of the air chamber 620 below the piston 610. A path 615 is formed.

  Here, the spindle 120 is configured to send air into the air chamber 620 from a rotary joint 145 provided at the lower end of the hollow portion 120a. Therefore, an air pipe 115 is provided in the hollow portion 120a of the spindle 120 so as to penetrate the hollow portion 120a up and down. An upper end portion of the air pipe 115 is fixed to the air pipe 115 by a flange 116, and a lower end portion is connected to the rotary joint 145.

  An air hose 132 for sending air into the air pipe 115 is connected to the rotary joint 145. The air sent from the air hose 132 via the rotary joint 145 passes through the air pipe 115 upward, further passes through the air passage 138 formed in the bracket portion 120b, and reaches the switching valve 131. The switching valve 131 switches whether the air that has passed through the air passage 138 is sent to the bracket portion 120b or the air path 135 of the spindle 120.

  Therefore, by operating the switching valve 131 and sending the air that has escaped into the air passage 138 to the bracket portion 120b, the internal pressure of the portion 621 above the piston 610 of the air chamber 620 increases, and the piston 610 drops. On the other hand, by operating the switching valve 131 and sending the air that has escaped into the air passage 138 to the air path 135 of the spindle 120, the internal pressure of the portion 622 below the piston 610 of the air chamber 620 increases, and the piston 610 rises. Note that a relief valve (not shown) that operates in conjunction with the switching valve 131 is disposed in each of the upper part 621 and the lower part 622 of the piston 610 of the air chamber 620. That is, when the air that has passed through the air passage 138 is sent to the bracket portion 120b, the relief valve on the lower portion 622 is opened, and the pressure in the lower portion 622 is reduced to the external pressure. Accordingly, the lowering of the piston 610 is not hindered by the pressure in the lower portion 622. Similarly, when the air that has passed through the air passage 138 is sent to the air path 135 of the spindle 120, the relief valve on the upper portion 621 side opens, and the pressure in the upper portion 621 decreases to the external pressure. Accordingly, the pressure in the upper portion 621 is not inhibited from rising of the piston 610.

  An insertion shaft coupling portion 630 is formed on the upper surface of the piston 610. The insertion shaft connecting portion 630 and the above-described insertion shaft 503 are configured to be chucked by a so-called collet chuck. That is, as shown in FIG. 4, the insertion shaft connecting portion 630 is formed with an insertion hole 631 for inserting the insertion shaft 503, and a wall between the outer periphery of the insertion shaft 503 and the insertion hole 631. A holding groove 634 for holding the ball 633 is formed at 632. The holding groove 634 is configured to hold the ball 633 so that the ball 633 cannot fall off and is movable in the wall thickness direction. Further, since the thickness of the wall 632 is smaller than the outer diameter of the ball 633, the ball 633 protrudes into the insertion hole 631 or protrudes outward from the outer periphery of the connecting portion 630.

  The outer periphery of the connecting portion 630 is surrounded by the connecting portion engaging inner peripheral wall 641 of the retracting cylinder unit 600. A groove (portion having a larger inner diameter than the others) 642 extending in the circumferential direction is formed in the connecting portion engaging inner peripheral wall 641. When the ball 633 held by the connecting portion 630 is at the same height as the groove 642, there is room for the ball 633 to protrude outward from the outer periphery of the connecting portion 630. In this state, the insertion shaft 503 can be inserted into the insertion hole 631 of the connecting portion 630 (without being obstructed by the ball 633).

  After the insertion shaft 503 is inserted into the insertion hole 631 of the connecting portion 630, air is sent to the portion 621 above the piston 610 of the air chamber 620 and the connecting portion 630 is moved downward together with the piston 610, as shown in FIG. The ball 633 (which can no longer protrude outward from the connecting portion 630) protrudes inside the insertion hole 631 and engages with an engagement groove 503a formed at the distal end portion of the insertion shaft 503. As a result, the insertion shaft 503 is reliably chucked in the drawing cylinder unit 600.

  Further, in the process of retracting the insertion shaft 503 as described above, the tapered cylindrical surface 534a of the adapter 534 is the contact surface of the surface of the chuck claw 616 in the spindle radial direction (hereinafter, this surface is defined as the contact surface 616b). 616b is contacted. When the insertion shaft 503 is further pulled from this state, the diameter of the portion of the adapter 534 that is in contact with the chuck claw 616 increases, and the chuck claw 616 is held until the chuck claw 616 is sandwiched between the adapter 534 and the hub hole H. Is moved radially outward (FIG. 4). Since the distance between the engagement surface 616a and the contact surface 616b of the chuck claw 616 is the same for any chuck claw 616, the engagement surface 616a of the chuck claw 616 has a central axis of the tapered cylindrical surface 534a. It is arranged on the circumference with the center. Further, since the central axis of the tapered cylindrical surface 534a always coincides with the rotation axis of the spindle 120, the engagement surface 616a of the chuck claw 616 is disposed on the circumference centering on the rotation axis of the spindle 120. become. Accordingly, the tire C is positioned so that the center axis of the hub hole H engaged with the engagement surface 616 a of the chuck claw 616 coincides with the rotation axis of the spindle 120.

  When the insertion shaft 503 is further pulled from this state, the downward displacement of the adapter 534 is inhibited by the hub hole H as shown in FIG. 6, and the adapter 534 moves relatively upward with respect to the insertion shaft 503. Accordingly, the distance between the spring guide (upper) 532 and the spring guide (lower) 531 is reduced, and the coil spring 533 is compressed. Accordingly, the adapter 534 is biased downward by the repulsive force of the coil spring 533. As a result, the tapered cylindrical surface of the adapter 534 urges the chuck claw 616 radially outward, and at this time, the friction force acting between the engagement surface 616a of the chuck claw 616 and the hub hole H causes the tire C Is chucked. In addition, after the chuck claw 616 is sandwiched between the tapered cylindrical portion 534a and the hub hole H of the adapter 534, that is, after the engaging surface 616a of the chuck claw 616 contacts the hub hole H of the wheeled tire C, the insertion shaft 503 is further moved. When retracted, the adapter 534 moves relatively upward with respect to the insertion shaft 503, so that the retraction of the insertion shaft 503 is not hindered.

  In addition, the contact portion 542 comes into contact with the wheel W when the insertion shaft 503 is pulled. The contact portion 542 is compressed between the wheel W and the wheel fixing cylinder 541 and is compressed and deformed following the shape of the wheel W. As a result, the contact portion 542 is in close contact with the wheel W and presses the wheel W toward the contact surface 603 with a load corresponding to the amount of compressive deformation. The wheel W is fixed on the contact surface 603 by this pressing force.

  Here, the contact surface 616b is slightly inclined from the vertical direction to the spindle radial direction so that the upper side thereof is away from the spindle rotation axis. The inclination of the contact surface 616b is equal to the taper gradient of the tapered cylindrical surface 534a of the adapter 534. Accordingly, the tapered cylindrical surface 534a and the contact surface come into contact with each other from the upper end to the lower end of the contact surface 616b. For this reason, since the contact surface 616b receives the force by which the tapered cylindrical surface 534a urges the chuck pawl on a wide surface, the problem that the contact surface 616b receives a concentrated stress and causes plastic deformation is avoided. be able to.

  On the other hand, when air is sent from this state to the portion 622 below the piston 610 of the air chamber 620 and the connecting portion 630 is moved upward together with the piston 610, as shown in FIG. 4 (projecting outward from the connecting portion 630). The engagement between the ball 633 and the engagement groove 503a is released. As a result, the top adapter 500 can be pulled out and the tapered cylindrical surface 534 a of the adapter 534 can be separated from the contact surface 616 b of the chuck claw 616. When the tapered cylindrical surface 534a moves away from the contact surface 616b, the chuck pawl 616 moves inward in the radial direction of the spindle 120 by the repulsive force of the coil spring 665, and the engagement between the engaging portion 616a of the chuck pawl 616 and the hub hole H is engaged. It can be solved.

  The mechanism C as described above fixes / releases the tire C to / from the spindle 120. As described above, according to the test apparatus of the present embodiment, the tire is fixed by the wheel fixing cylinder 541 pressing and urging the wheel W via the contact portion 542. Therefore, the test apparatus according to the present embodiment adjusts the pull-in amount of the shaft 503 in accordance with the height of the contact position between the contact portion 542 and the wheel W, so that a plurality of types of tires having different contact positions can be used as the spindle. It can be attached. That is, when a tire having a thick wheel W ′ as shown in FIG. 9 is attached to the spindle, the contact position between the contact portion 542 and the wheel W ′ is compared with the example of FIG. Come to a high position. In such a case, the amount of deformation of the contact portion 542 is set within a predetermined range by setting the pull-in amount of the shaft 503 to be small, and the load applied to the wheel W ′ from the contact portion 542 is adjusted. With the above mechanism, even when a tire with a different contact position is attached to the spindle, the load applied to the wheel from the contact portion 542 is maintained within an appropriate range, and the tire is not sufficiently fixed due to insufficient load. Alternatively, it is possible to avoid a problem that the wheel or the test apparatus is damaged by an excessive load.

  A method of fitting the double row cylindrical roller bearing 112a into the spindle 120 will be described with reference to FIG. A collar 121 a having a square cross section is fitted into the bracket portion 120 b of the spindle 120. Here, the upper surface of the collar 121a abuts on the lower surface of the flange portion formed at the upper end of the bracket portion 120b.

  Here, the outer periphery of the portion of the bracket portion 120b that engages with the double-row cylindrical roller bearing 112a forms a tapered surface 120d that becomes thicker upward. Further, the inner circumference of the double row cylindrical roller bearing 112a is formed in a tapered shape having the same gradient as the tapered surface 120d and thickening upward. The diameter of the upper end portion of the tapered surface 120d is slightly larger than the diameter of the inner periphery of the double row cylindrical roller bearing 112a.

  Further, a collar 121b having a square cross section is inserted between the double row cylindrical roller bearing 112a and the combination angular ball bearing 113. Here, the upper surface of the collar 121b contacts the lower end of the double row cylindrical roller bearing 112a. Similarly, the lower surface of the collar 121b abuts on the upper end of the combined angular ball bearing 113. Furthermore, a collar 121c having a square cross section is fitted into the bracket portion 120b. Here, the upper surface of the collar 121 c comes into contact with the lower end of the combination angular contact ball bearing 113.

  Furthermore, the external thread part 120c is screwed by the bracket part 120b. The male screw portion 120c is screwed downwardly from the lower surface of the collar 121c when the collar 121a, the double row cylindrical roller bearing 112a, the collar 121b, the combination angular ball bearing 113, and the collar 121c are fitted into the bracket portion 120b.

  Here, the collar 121a, the double row cylindrical roller bearing 112a, the collar 121b, the combination angular ball bearing 113, and the collar 121c are sequentially fitted into the bracket portion 120b. At this time, the double-row cylindrical roller bearing 112a is fitted into the bracket portion 120b.

  Next, the double-row cylindrical roller bearing 112a is formed by screwing a biasing nut 114a having a female thread portion that can be screwed to the male thread portion 120c on the inner periphery thereof, and further tightening with a predetermined torque. Pushed upwards. Next, in order to prevent the biasing nut 114a from loosening, the locking nut 114b is screwed onto the male screw portion 120c, and the upper surface of the locking nut 114b is biased against the lower surface of the biasing nut 114a.

  As described above, the diameter of the upper end portion of the tapered surface 120d is slightly larger than the inner diameter of the double row cylindrical roller bearing 112a. As a result, the tapered surface 120d and the inner circumference of the double row cylindrical roller bearing 112a are in close contact with each other. . Therefore, since the inner ring of the spindle 120 and the double row cylindrical roller bearing 112a is completely integrated, rattling between the spindle 120 and the double row cylindrical roller bearing 112a is prevented. Further, since the clearance between the inner ring and the steel ball of the combined angular ball bearing 113 and the clearance between the steel ball and the outer ring is minimized, the rattling between the inner ring and the steel ball of the combined angular ball bearing 113 and between the steel ball and the outer ring is minimized. Is prevented.

  The method of fitting the double row cylindrical roller bearing 112b into the spindle 120 is the same as the method of fitting the double row cylindrical roller bearing 112a into the spindle 120. Here, since the radial load applied to the double row cylindrical roller bearing 112b is smaller than the radial load applied to the double row cylindrical roller bearing 112a, the biasing nut directly biases the double row cylindrical roller bearing 112b. Do not use a locking nut. That is, after the double row cylindrical roller bearing 112b is fitted into the hollow portion 120a of the spindle 120, the urging nut 114c is screwed onto the male screw portion screwed to the outer periphery of the hollow portion 120a.

  The uniformity test is a test in which the tire is rotated together with the spindle while the rotating drum is pressed with a force of several hundred kgf or more, and the variation in the force generated by the rotating tire is measured from the fluctuation of the load at that time. . In the embodiment of the present invention, the load fluctuation is measured by a load cell (not shown) attached to the rotating drum.

  In addition, the dynamic balance test is a test in which the tire is rotated together with the spindle without a rotating drum, and the eccentric state of the tire is measured from the excitation force generated from the unbalance of the tire at that time. The excitation force is measured by piezoelectric elements 185 installed at four locations on one side of the spindle housing 110.

  The piezoelectric element 185 is a cylindrical sensor having a measurement range of approximately 0 to 10000 kgf, such as a crystal piezoelectric force sensor 9103A manufactured by KISTLER, and converts a load applied in the axial direction into an electrical signal. . The piezoelectric element 185 is integrated with the spindle housing 110 in order to accurately measure the load received by the spindle 120.

  In other words, in order to integrate the piezoelectric element 185 with the spindle housing 110, the piezoelectric element 185 is sandwiched between the piezoelectric element fixing plate 102 and one side surface of the spindle housing 110. As shown in FIG. 3, a through hole 102 a having substantially the same diameter as the hole of the piezoelectric element 185 is formed in the thickness direction of the piezoelectric element fixing plate 102 at a position where the piezoelectric element 185 of the piezoelectric element fixing plate 102 is in contact. Perforated. Similarly, at a portion where the piezoelectric element 185 of the spindle housing 110 is in contact, a through hole 110a having substantially the same diameter as the hole of the piezoelectric element 185 in the plate thickness direction on one side surface of the spindle housing 110 to which the piezoelectric element 185 is attached. Is perforated. A female screw is threaded on the inner periphery of the through hole 110 a of the spindle housing 110.

  A cylindrical bar 186 in which a male screw that can be screwed with a female screw of the through hole 110a of the spindle housing 110 is threaded on all sides is provided in the through hole 102a and the piezoelectric element 185 of the piezoelectric element fixing plate 102. It is inserted. Further, the bar 186 is screwed into the through hole 110 a of the spindle housing 110. The tip of the bar 186 is in contact with the double row cylindrical roller bearing 112a or 112b.

  Here, a nut 187 is screwed to a portion of the bar 186 protruding from the piezoelectric element fixing plate 102 (left side in FIG. 3). The nut 187 is tightened with a predetermined torque. As a result, the nut 187 presses the piezoelectric element fixing plate 102 with an axial force of about 5000 kgf. Accordingly, the piezoelectric element 185 is sandwiched between the piezoelectric element fixing plate 102 and one side surface of the spindle housing 110 with a force of about 5000 kgf, and is integrated with the piezoelectric element fixing plate 102 and the spindle housing 110.

  A pulley 140 for rotationally driving the spindle 120 is attached to the lower portion of the hollow portion 120a of the spindle 120. An endless belt 142 is looped over the pulley 140 and is driven to rotate (via the endless belt 142) by a spindle drive motor 130 fixed to the base 50. That is, when the spindle drive motor 130 is rotated, the spindle 120 rotates while the top adapter 500 and the pull-in cylinder unit 600 hold the wheeled tire C.

  The inserter unit 200 that drives the top adapter 500 up and down and inserts (or pulls out) the insertion shaft 503 of the top adapter 500 into the insertion hole 631 of the cylinder unit 600 is further above the top plate 54 shown in FIG. It is attached to the arranged elevating housing 60. The elevating housing 60 is supported by four sets of linear guides 61 extending in the vertical direction so as to be movable up and down. The elevating housing 60 is driven up and down by a ball screw 65 driven by a servo motor 66 and an arm portion 67 having a screw hole that is screwed into the ball screw 65 provided on the outer surface of the elevating housing 60.

  FIG. 8 is a side view showing the structure of the inserter unit 200. The inserter unit 200 has a substantially cylindrical unit main body 240. The unit main body 240 is attached to the elevating housing 60 so that the substantially cylindrical unit main body 240 and the spindle 120 are coaxial (the central axes are aligned in a straight line).

  Three chuck claws 210 (only two are illustrated in FIG. 8) that are engaged from the outside with the engagement flange portion 520 of the top adapter 500 are provided at the lower portion of the unit main body 240. The chuck claw 210 is urged toward the outside in the radial direction of the unit main body 240 by a spring member (not shown).

  The chuck claws 210 are driven in the radial direction of the unit main body 240 by air pressure. That is, when air is supplied to an air supply port (not shown) provided in the unit main body 240, the air urges the chuck claws 210 toward the inside of the unit main body 240 in the radial direction. Accordingly, by supplying air to the unit main body 240, the chuck claw 210 moves radially inward of the unit main body 240 and chucks the engagement flange portion 520 of the top adapter 500. On the other hand, when air is extracted from the unit main body 240 from this state, the chuck claws 210 are moved radially outward of the unit main body 240 by the biasing force of the spring member, and the chuck is released.

  The wheeled tire C is held by the combined testing apparatus 1 configured as described above as follows. First, air is supplied to the unit main body 240 of the inserter unit 200, the top adapter 500 is chucked by the chuck claws 210, the ball screw 65 is driven to raise the elevating housing 60, and the top adapter 500 is pulled in and pulled out from the cylinder unit 600. . Next, after setting the tire C in the retracting cylinder unit 600, the ball screw 65 is driven again, and the top adapter 500 is inserted into the cylinder unit 600. Next, the air is removed from the unit main body 240 of the inserter unit 200 to release the chuck by the chuck claw 210 so that the top adapter 500 can rotate with the spindle 120.

  Next, a uniformity test and a dynamic balance test using the composite test apparatus 1 will be described with reference to FIG. The following series of tests is performed by a program executed by a computer (not shown) of the combined test apparatus 1.

  When performing the dynamic balance test, the control unit (not shown) of the composite test apparatus 1 fixes the wheeled tire C to the spindle 120 using the top adapter 500, and then rotates the spindle 120 to rotate the spindle 120. The fluctuation of the load applied to the piezoelectric element 185 is detected during the rotation. Since a method for calculating the dynamic balance based on the detected load fluctuation is known, the description thereof is omitted. The composite test apparatus 1 calculates which part of the tire part T ′ of the wheeled tire C is to be loaded with the balance weight based on the calculation result of the dynamic balance, and marks the corresponding part with a marking device (not shown). .

  In the uniformity test, the rotating drum 300 provided on the side of the spindle 120 is used. The rotating drum 30 is mounted on a movable housing 32 slidable on a rail 31 extending in the direction of approaching / separating from the wheeled tire C, and is supported by a rack and pinion mechanism 35 (pinion 36 / rack) driven by a motor (not shown). 38) to move in the approach / separation direction with respect to the wheeled tire C.

  In the uniformity test, the control unit (not shown) of the composite test apparatus 1 presses the rotating drum 30 against the tire part T ′ of the wheeled tire C by the rack and pinion mechanism 35 to rotate the spindle 120. Then, the load fluctuation received by the wheeled tire C by the load cell attached to the rotating drum 30 during the rotation of the spindle 120 is detected as a reaction force that the rotating drum 30 receives from the wheeled tire C. Since a method of calculating the uniformity index value based on the detected load fluctuation is known, a description thereof will be omitted. The composite test apparatus 1 calculates which part of the tire part T ′ of the tire C with a wheel is cut based on the calculation result of the uniformity, and cuts the tire part T ′ with a cutting apparatus (not shown).

1 is a side view of a composite test apparatus capable of performing a dynamic balance test and a uniformity test of a tire according to an embodiment of the present invention. It is sectional drawing and a front view of a general tire with a wheel. It is a sectional side view of the spindle in an embodiment of the invention. It is a sectional side view of a drawing cylinder unit and a top adapter in an embodiment of the invention. FIG. 5 is a cross-sectional view taken along line A-A ′ of FIG. 4. FIG. 3 is a side sectional view of the retracting cylinder unit and the top adapter to which the tire is fixed in the embodiment of the present invention. FIG. 3 is a partially cut perspective view of the spindle according to the embodiment of the present invention around a bearing. It is a side view which shows the structure of the inserter unit of embodiment of this invention. FIG. 7 is a side sectional view of a retracting cylinder unit and a top adapter to which a different type of tire from FIG. 6 is fixed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Compound test apparatus 30 Rotating drum 50 Base 60 Elevating housing 65 Ball screw 66 Servo motor 67 Arm part 102 Piezoelectric element fixed plate 110 Spindle housing 112a Double row cylindrical roller bearing 112b Double row cylindrical roller bearing 113 Combination angular contact ball bearing 114 Collar 120 Spindle 120b Bracket part 120c Male thread part 120d Tapered surface 140 Pulley 142 Spindle drive motor 143 Cylinder 185 Piezoelectric element 187 Nut 200 Inserter unit 240 Unit body 210 Chuck claw 500 Top adapter 501 Pin 503 Insertion shaft 520 Engagement flange part 531 Spring guide (lower) )
532 Spring guide (upper)
533 Coil spring 534 Adapter 541 Wheel fixed cylinder 542 Contact portion 600 Retraction cylinder unit 604 Shaft engagement hole 610 Piston 613 Guide shaft 614 Air path 616 Chuck claw 620 Air chamber 630 Insert shaft connection portion

Claims (11)

A wheeled tire uniformity configured to rotate a spindle rotatable about a vertical axis to perform dynamic balancing and / or uniformity testing of a wheeled tire attached to the upper end side of the spindle, and / or A dynamic balance testing device,
A wheel mount provided at an upper end of the spindle and provided with a flat surface on which the wheel is placed;
A pressing means driven to press a wheel on the wheel mount toward the wheel mount;
At least three chuck claws having an engaging surface that is movable in a radial direction of the spindle and engageable with an inner peripheral surface of a hub hole of the wheel;
Have
The pressing means is
A contact portion that contacts the wheel;
A shaft inserted in the direction of the rotation axis of the spindle into the wheel mount via a hub hole of a wheel mounted on the wheel mount;
A tapered cylindrical surface formed coaxially with the rotation axis of the spindle and having an outer diameter increasing from bottom to top is guided by the side surface of the shaft so as to advance and retreat coaxially with the rotation axis of the spindle. And an adapter member adapted to be inserted from above into a hub hole of a wheel on the wheel mount when the abutting portion is in contact with the wheel,
First biasing means for biasing the adapter member downward;
Have
Each of the chuck claws abuts on the tapered cylindrical surface of the adapter when the adapter member is inserted into the hub hole, and at this time, each engagement surface is arranged on a circumference centering on the rotation axis of the spindle. Is supposed to be
When the adapter member is inserted into the hub hole, the tapered cylindrical surface of the adapter member biased by the first biasing means moves the at least three chuck claws outward in the radial direction of the spindle. A uniformity and / or dynamic balance test device for a tire with wheels, wherein the engagement surface is engaged with an inner peripheral surface of the hub hole.   The test apparatus according to claim 1, wherein the at least three chuck claws are disposed at substantially equal angular intervals.   When the tapered cylindrical surface is not in contact with the at least three chuck claws, the test device rotates the spindle so that the engagement surface does not contact the hub hole. The test apparatus according to claim 1, further comprising second urging means for urging the shaft toward the shaft. The first biasing means is a spring member having one end fixed to the shaft and the other end fixed to the adapter member;
When the shaft is pulled into the wheel mount with the adapter and the chuck claw, and the chuck claw and the hub hole in contact with each other, the spring member biases the adapter member downward. Has become,
The test apparatus according to claim 1, wherein: The wheel mount is
A cylinder,
A piston member capable of moving up and down by air pressure in the cylinder;
The test apparatus according to claim 4, wherein the piston member chucks the shaft and further lowers the piston member so that the shaft is drawn into the wheel mount.   The test apparatus according to claim 5, wherein the shaft is chucked by the piston member by a collet chuck mechanism.   The test apparatus according to claim 1, wherein the contact portion includes an elastic member.   The test apparatus according to claim 7, wherein the elastic member is hard rubber. The pressing means further includes third biasing means formed integrally with the shaft;
When the shaft is pulled into the wheel mount, the elastic member is sandwiched between the third biasing means and the wheel, and the elastic member is sandwiched between the third biasing means and the wheel and compressed. The test apparatus according to claim 7, wherein the wheel is pressed and urged by a repulsive force of the elastic member generated by the movement.   The test apparatus according to claim 9, wherein the third urging unit has a cylindrical shape coaxial with the shaft.   The test apparatus according to claim 9, wherein the test apparatus includes a pull-in control unit that adjusts a pull-in amount of the shaft in accordance with a contact position between the elastic member and the wheel.

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