JP4598482B2 - Tire holding device - Google Patents

Description

  The present invention relates to a tire holding device used in a tire testing machine that measures tire uniformity and runout, for example, in an automobile tire manufacturing process.

  In general, if the weight balance or thickness of the tire in the circumferential direction of the automobile tire is biased, it may cause a decrease in the running performance of the tire. Therefore, the quality of the tire after vulcanization molding is determined by a tire testing machine in the tire manufacturing process. I am inspecting. For example, the measurement of uniformity, which is one of the tire qualities, is performed by holding the tire with a pair of rim members attached to opposite ends of a pair of upper and lower support shafts, rotating the tire by applying an internal pressure, This is done by bringing a measuring machine into contact with the outer peripheral surface.

As a tire holding device for such a tire testing machine, an upper support shaft that is rotatably supported, an upper rim member that is attached to the lower end side of the upper support shaft, and a hydraulic cylinder can be moved vertically. A lower support shaft that is supported, and a lower rim member that is rotatably attached to the upper end side of the lower support shaft. The upper support shaft is provided at the center of the upper end surface of the lower support shaft. An engaging projection having an inclined surface that gradually decreases in outer diameter toward the bottom is provided, and an inclined surface whose inner diameter gradually increases toward the lower supporting shaft at the center of the lower end surface of the upper supporting shaft. An engagement hole is provided, the support shaft is moved upward by a hydraulic cylinder, the tire is held by each rim member, and the engagement protrusion is engaged with the engagement hole so that the rim members are axially connected to each other. Hold on the same axis at a predetermined interval Ones are known (e.g., see Patent Document 1.).
JP-A-9-295359

  By the way, when an internal pressure is applied to the tire mounted on each rim member, a large force is exerted on each rim member in the direction away from each other in the axial direction. The peripheral portion is not an appropriate width dimension, and a gap is generated between the engagement protrusion and the engagement hole, so that each rim member cannot be held on the same axis, and the measurement accuracy of the tire testing machine decreases. . Therefore, in the apparatus, it is necessary to use a hydraulic cylinder with a large output that does not move due to the internal pressure of the tire, or to provide another mechanism for restricting the movement of each rim member and each spindle in the axial direction. For this reason, there is a problem that the structure becomes complicated, leading to failure and an increase in manufacturing cost.

  The present invention has been made in view of the above-described problems, and its object is to securely hold the rim members on the same axis at predetermined intervals in the axial direction even when an internal pressure is applied to the tire. Another object of the present invention is to provide a tire holding device capable of simplifying the structure and improving durability.

In order to achieve the above object, the present invention includes a pair of support shafts arranged to face each other in the axial direction, and a pair of rim members respectively attached to opposing ends of the support shafts. In the tire holding device that holds the tire in a predetermined position in the axial direction, an engagement protrusion extending toward the other support shaft is provided on the distal end side of one support shaft, and the other support shaft is provided on the outer peripheral surface of the engagement protrusion. Inclined surfaces that are inclined radially outward toward the side are formed at a plurality of positions at intervals in the circumferential direction, and an engagement hole into which an engagement protrusion can be inserted is provided on the tip side of the other support shaft, On the inner peripheral surface of the engagement hole, inclined surfaces that are inclined radially inward toward one of the support shafts are formed at a plurality of locations at intervals in the circumferential direction, and the engagement protrusion and the engagement hole are formed. By engaging the positions of the inclined surfaces in the circumferential direction, they are engaged in the axial direction, The position of the inclined surface by shifting in the circumferential direction is formed as engagement axial direction is released, provided with a threaded portion on the inner peripheral surface of each rim member, the threaded portion on the outer circumferential surface of the axles Each rim member is threadably engaged with the threaded portion of each support shaft so that each rim member is threadably engaged with the outer peripheral surface of each support shaft in the axial direction. , to restrict the relative rotation of the one of the one rim member and one of the support shaft holding the threaded portion of the outer peripheral surface of the support shaft by diameter inner peripheral surface, the diameter increases the inner circumferential surface Thus, a hydraulic chuck is provided that allows one rim member and one support shaft to rotate relative to each other, and the other rim member has a threaded portion on the outer peripheral surface of the other support shaft by reducing the inner peripheral surface. gripping the regulate the relative rotation of the other rim member and the other shaft, the diameter increases the inner circumferential surface The hydraulic chuck for the other rim member and the other support shaft rotatable relative by the provided the hydraulic chuck, respectively at one end and the other end of the support shaft axis direction of the rim member, each limb Rotating means for rotating each rim member and each support shaft relatively so that the members move by an equal distance in the opposite axial direction with respect to each support shaft is provided .

As a result, the inclined surfaces of the engaging protrusions and the inclined surfaces of the engaging holes engage with each other, so that each support shaft and each rim member are positioned on the same axis, and each rim member is predetermined in the axial direction. When the force in the direction away from each other in the axial direction is applied to each rim member, the inclined surface of the engaging protrusion and the inclined surface of the engaging hole abut on each other in the axial direction. The movement of the rim member in the axial direction is restricted, and each rim member is securely held on the same axis without causing a positional shift. Further, since the rim member is screwed to the outer peripheral surface of the support shaft so as to be movable in the axial direction, the distance between the rim members in the axial direction can be adjusted by relatively rotating the rim member and the support shaft. it can. That is, the interval between the rim members can be adjusted steplessly by the relative rotation angle between the rim member and the rotation shaft. Furthermore, since the rim member is provided with a hydraulic chuck and the relative rotation between the rim member and the support shaft is restricted by reducing the diameter of the inner peripheral surface of the hydraulic chuck, the rim member is controlled in a predetermined axial direction of the support shaft. It can be securely held in position. In addition, since the hydraulic chuck is provided on each of the one end side and the other end side in the support shaft direction of the rim member, the rim member can be securely held on the support shaft. Further, since each rim member is provided with a rotating means for relatively rotating each rim member and each support shaft such that each rim member moves by an equal distance in the opposite axial direction with respect to each support shaft, When adjusting the axial interval between the rim members, the axial central portion of the tire held by each rim member is always positioned at a predetermined height without changing the axial central position between the rim members. Can be made.

According to the present invention, when forces in the direction away from each other in the axial direction act on each rim member, each rim member can be reliably held on the same axis at a predetermined interval in the axial direction. When measuring the uniformity by applying an internal pressure to the tire held by each rim member, the tire being measured can always be held at an appropriate position, and the measurement accuracy can be improved. Further, it is not necessary to provide a hydraulic cylinder with a large output or a complicated mechanism in order to resist the internal pressure of the tire, and the structure can be simplified and the durability can be improved. Also, by providing the rim member with a hydraulic chuck, the rim member can be reliably held at a predetermined position in the axial direction of the support shaft, which is extremely advantageous for improving measurement accuracy. Furthermore, since the interval between the rim members can be adjusted steplessly by the relative rotation angle between the rim member and the rotation shaft, it is extremely advantageous when measuring tires of various sizes. In addition, since the hydraulic chuck is provided on each of the one end side and the other end side in the support shaft direction of the rim member, and the rim member can be securely held on the support shaft, it is extremely advantageous in improving measurement accuracy. Further, when adjusting the axial interval between the rim members, the axial central portion of the tire held by each rim member is always kept at a predetermined height without changing the axial central position between the rim members. For example, it is not necessary to adjust the position in the height direction of the measuring device for measuring the uniformity of the tire held by each rim member, and the structure of the tire measuring machine can be simplified. Can do.

  FIGS. 1 to 7 show an embodiment of the present invention. FIGS. 1 and 2 are partially sectional front views of a tire testing machine, FIG. 3 is a principal sectional front view of a tire holding device, and FIG. FIG. 5 is a perspective view of a main part of the tire holding device showing a state in which the engagement protrusion and the engagement hole are engaged with each other. FIG. FIG. 6 is a front cross-sectional view of the main part of the tire holding device showing a state in which the engagement protrusions of the middle shaft are engaged, and FIG. 7 is a main part of the tire holding device showing a state in which the interval between the rim members is changed It is front sectional drawing.

  The tire holding device of the present embodiment is provided in a tire testing machine that performs uniformity inspection and run-out measurement of a tire TA for automobiles, and is provided on the upper side as a support shaft that is rotatably supported by the tire testing machine body 1. The rotary shaft 10 and the lower rotary shaft 20, a rim member 30 attached to the lower end side of the upper rotary shaft 10, and a rim member 40 attached to the upper end side of the lower rotary shaft 20 are configured. Yes.

  The tire testing machine main body 1 is held by a base 2 for installing the tire testing machine main body 1 at a predetermined position, a frame 4 supported by the base 2 via a plurality of support columns 3, and rim members 30 and 40. A known measuring device 5 for measuring the uniformity of the tire TA and a conveyor 6 for conveying the tire TA between the rim member 30 and the rim member 40 are provided.

  The measuring device 5 is provided so as to be movable in the horizontal direction, and comes into contact with the outer peripheral surface of the tire TA held by the rim members 30 and 40.

  The conveyor 6 includes a plurality of rollers 6a arranged in the front-rear direction at intervals, and a frame 6b that rotatably supports both ends of each roller 6a. A tire TA is provided from the back side to the front side in FIG. It is designed to be transported.

  The rotating shaft 10 on the upper side of the tire holding device is inserted through a rotating shaft main body 11 formed in a cylindrical shape, an engaging member 12 attached to a lower end portion of the rotating shaft main body 11, and a central portion of the rotating shaft main body 11. And a middle shaft 13.

  The rotating shaft body 11 is rotatably supported by the frame 4 via a bearing 11a, and is rotated by a motor 11b as a rotating mechanism including a known servo motor. Further, a screw hole 11 c is provided at the center of the lower end surface of the rotary shaft main body 11, and a screw portion 11 d made of a right-handed trapezoidal screw is provided at the lower end side of the outer peripheral surface of the rotary shaft main body 11. Further, the outer peripheral surface on the upper end side of the rotating shaft main body 11 is formed with a notch 11e in one place in the circumferential direction, and the notch 11e is detected by a known tachometer 11f.

  The engagement member 12 is provided with a screw portion 12a at the center on the upper end side, and the engagement member 12 is fixed to the rotation shaft main body 11 by screwing the screw portion 12a into the screw hole 11c of the rotation shaft main body 11. Yes. Further, an extending portion 12b extending upward is provided on the outer peripheral portion on the upper end side of the engaging member 12, and an engaging hole 12c is provided on the lower end surface of the engaging member 12. Here, the engagement hole 12 c is provided on the same axis as the rotation shaft 10. Further, inclined surfaces 12d that gradually inwardly incline toward the lower rotating shaft 20 are formed on the inner peripheral surface of the engagement hole 12c at a plurality of locations (three locations in the present embodiment) at intervals in the circumferential direction. Is formed.

  The middle shaft 13 is made of a cylindrical member, and has a disk-shaped locking portion 13a as one locking portion of the holding means on the lower end side, and a well-known air cylinder on the upper end side via a bearing 13b. Is supported by a cylinder 13c, and is moved up and down by the cylinder 13c. On the lower end surface of the locking portion 13a, locking protrusions 13d extending toward the lower rotary shaft 20 are formed at a plurality of locations (three locations in the present embodiment) at intervals in the circumferential direction. Further, a key groove 13e extending in the vertical direction is provided on the outer peripheral surface on the lower end side of the intermediate shaft 13, and by engaging the convex portion 12e formed on the inner peripheral surface of the engagement member 12, the intermediate shaft 13 is rotated. It rotates together with the main body 11.

  The lower rotating shaft 20 includes a rotating shaft main body 21 formed in a columnar shape, and an engaging member 22 attached to the upper end portion of the rotating shaft main body 21.

  The rotating shaft main body 21 is rotatably supported by a housing 2b at the tip of a rod of a hydraulic cylinder 2a provided on the base 2 via a bearing 21a, and a rotating mechanism comprising a known servo motor is provided on the outer peripheral surface of the housing 2b. The motor 21b is fixed, and the rotary shaft main body 21 is rotated by the motor 21b. Further, a screw hole 21 c is provided at the center of the upper end surface of the rotary shaft main body 21, and a screw portion 21 d is provided at the upper end side of the outer peripheral surface of the rotary shaft main body 21. Here, the screw portion 21 d is a left-handed trapezoidal screw having a pitch equal to that of the screw portion 11 d of the rotary shaft main body 11. Further, the outer peripheral surface on the lower end side of the rotating shaft main body 21 is formed with a notch 21e in one place in the circumferential direction, and the notch 21e is detected by a known tachometer 21f. Here, the tachometer 21f is fixed to a support member 41g described later.

  The engaging member 22 is provided with a screw portion 22a at the lower end side central portion, and the engaging member 22 is fixed to the rotating shaft main body 21 by screwing the screw portion 22a into the screw hole 21c of the rotating shaft main body 21. Yes. In addition, an extending portion 22 b extending downward is provided on the outer peripheral portion on the lower end side of the engaging member 22 over the entire periphery, and the upper end surface of the engaging member 22 extends toward the first rotating shaft 10. An engagement protrusion 22c is provided, and the engagement hole 12c is formed so that the engagement protrusion 22c can be inserted. Here, the engaging protrusion 22 c is provided on the same axis as the rotating shaft 20. In addition, inclined surfaces 22d that gradually incline outward toward the upper rotation shaft 10 are formed on the outer peripheral surface of the engaging protrusion 22c at a plurality of locations (three locations in the present embodiment) at intervals in the circumferential direction. ing. Further, locking holes 22e as the other locking portions of the holding means are provided at positions corresponding to the locking protrusions 13d of the middle shaft 13 on the upper end surface of the engaging protrusion 22c.

  The rim member 30 includes a rim holder 31 that is threadably engaged with a threaded portion 11 d on the outer peripheral surface of the rotary shaft body 11, a hydraulic chuck 32 as a gripping mechanism attached to the upper end surface of the rim holder 31, and the rim holder 31. And a rim 34 that is attached to the rim holder 31 and holds the inner peripheral surface of the tire TA.

  The rim holder 31 is provided with a screw portion 31 a on the inner peripheral surface, and the rim holder 31 is attached to the rotary shaft main body 11 by screwing the screw portion 31 a with the screw portion 11 d of the rotary shaft main body 11. An extending portion 31b extending downward is provided over the entire outer periphery of the rim holder 31, and an inner peripheral surface of the extending portion 31b is formed along the outer peripheral surface of the extending portion 12b of the engaging member 12. ing. Further, a flange portion 31c extending radially outward is provided at the lower end portion of the extending portion 31b, and a plurality of mounting holes 31d are provided in the flange portion 31c at intervals in the circumferential direction.

  Further, on the outer peripheral surface of the rim holder 31, groove portions 31e extending in the vertical direction from the upper end surface to the flange portion 31c are provided at a plurality of locations (two locations in the present embodiment) at intervals in the circumferential direction. Further, cylinders 31f as engaging members made of known air cylinders are respectively arranged outside the respective groove portions 31e, and the tip ends of the rods of the respective cylinders 31f are detachably engaged with the respective groove portions 31e. Yes. Here, each cylinder 31f is fixed to the frame 4 by a supporting member 31g.

  The hydraulic chucks 32 and 33 are formed of known devices whose inner peripheral surfaces can be expanded and contracted by hydraulic pressure, and outer diameter fixing portions 32a and 33a capable of gripping the outer peripheral surface of the screw portion 11d of the rotary shaft body 11 are provided on the inner peripheral surface. It has been.

  The rim 34 is formed of a ring-shaped member, and screw holes 34a corresponding to the mounting holes 31d of the rim holder 31 are provided on the upper end surface of the rim 34, and are attached to the rim holder 31 by bolts. Further, the lower end surface of the rim 34 is formed in a curved shape along the shape of the inner peripheral portion of the tire TA.

  The rim member 40 includes a rim holder 41 that is threadably engaged with a threaded portion 21 d on the outer peripheral surface of the rotary shaft main body 21, a hydraulic chuck 42 as a gripping mechanism attached to the upper end surface of the rim holder 41, and the rim holder 41. And a rim 44 attached to the rim holder 41 and holding the inner peripheral surface of the tire TA.

  The rim holder 41 is provided with a screw portion 41 a on the inner peripheral surface, and the rim holder 41 is attached to the rotary shaft main body 21 by screwing the screw portion 41 a with the screw portion 21 d of the rotary shaft main body 21. An extending portion 41b extending upward is provided on the outer peripheral portion of the rim holder 41, and the inner peripheral surface of the extending portion 41b is formed along the outer peripheral surface of the extending portion 22b of the engaging member 22. ing. In addition, a flange portion 41c extending radially outward is provided at the upper end portion of the extending portion 41b, and a plurality of mounting holes 41d are provided in the flange portion 41c at intervals in the circumferential direction.

  Furthermore, on the outer peripheral surface of the rim holder 41, groove portions 41e extending in the vertical direction from the flange portion 41c to the lower end surface are provided at a plurality of locations (two locations in the present embodiment) at intervals in the circumferential direction. Further, cylinders 41f as engaging members made of known air cylinders are respectively arranged outside the respective groove portions 41e, and the tips of the rods of the respective cylinders 41f are detachably engaged with the respective groove portions 41e. Yes. Here, each cylinder 41f is fixed to the base 2 by a support member 41g. As shown in FIG. 2, when the rotary shaft 20 is lowered by the hydraulic cylinder 2a, the tip of the rod of each cylinder 41f is engaged with each groove 41g.

  The hydraulic chucks 42 and 43 are well-known devices whose inner peripheral surface can be expanded and contracted by hydraulic pressure, and outer diameter fixing portions 42a and 43a capable of gripping the outer peripheral surface of the screw portion 21d of the rotary shaft main body 21 are provided on the inner peripheral surface. It has been.

  The rim 44 is formed of a ring-shaped member, and screw holes 44a corresponding to the mounting holes 41d of the rim holder 41 are provided on the lower end surface of the rim 44, and are attached to the rim holder 41 by bolts. Further, the upper end surface of the rim 44 is formed in a curved surface shape along the shape of the inner peripheral portion of the tire TA.

  In the tire testing machine configured as described above, first, the lower rotary shaft 20 is arranged below the conveyor 6 by the hydraulic cylinder 2a, and the tire TA after vulcanization molding is transferred to each rotary shaft by the conveyor 6. 10 and 20 are arranged on substantially the same axis.

  Next, by reducing the diameter of each hydraulic chuck, 32, 33, 42, 43, each motor 11b, 21b in a state where relative rotation between each rim holder 31, 41 and each rotary shaft 10, 20 is restricted. Thus, the rotary shafts 10 and 20 are rotated to positions where the notches 11e and 21e are detected by the tachometers 11f and 21f, and the lower rotary shaft 20 is raised by the hydraulic cylinder 2a. As a result, the inner peripheral portion of the tire TA is supported by the rim member 40, and the engaging protrusion 22c of the lower rotating shaft 20 is inserted into the engaging hole 12c of the upper rotating shaft 10 as shown in FIG. . At this time, each of the inclined surfaces 22d of the engaging protrusion 22c and each of the inclined surfaces 12d of the engaging hole 12c are displaced from each other in the circumferential direction, so that the engaging protrusion 22c can be inserted into the engaging hole 12c. it can.

  Next, as shown in FIG. 5, the lower rotary shaft 20 is rotated by the motor 21 b without rotating the upper rotary shaft 10, and the respective inclined surfaces 22 d and the respective inclined surfaces 12 d are aligned in the circumferential direction. At the same time, the lower rotary shaft 20 is lowered by the hydraulic cylinder 2a, and the inclined surfaces 22d and the inclined surfaces 12d are engaged. Thus, the rotary shafts 10 and 20 and the rim members 30 and 40 are positioned on the same axis by the inclined surfaces 22d and the inclined surfaces 12d, and the rim members 30 and 40 are spaced apart from each other by a predetermined distance in the axial direction. The inner periphery of the tire TA is held by the rim members 30 and 40. Here, as shown in FIG. 6, the middle shaft 13 is lowered by the cylinder 13c, the locking projection 13d is inserted into the locking hole 22e, and the locking projection 13d and the locking hole 22e are locked in the circumferential direction. Thus, the engagement hole 12c and the engagement protrusion 22c are held so as not to rotate relatively.

  Next, an internal pressure is applied to the tire TA by a compressor (not shown), the rotating shafts 10 and 20 are rotated by the motor 11b, and the measuring device 5 is brought into contact with the outer peripheral surface of the tire TA to measure the uniformity. At this time, by applying an internal pressure to the tire TA, a large force acting in a direction away from each other acts on each rim member 30, 40, but each rotary shaft 10, 20 to which each rim member 30, 40 is attached is an engaging member. Since the rim members 30 and 40 are engaged with each other, the rim members 30 and 40 are held at the predetermined intervals. At this time, since each inclined surface 12d and each inclined surface 22d abut each other in the axial direction, movement of each rim member 30, 40 in the axial direction is restricted, and each rim member 30, 40 is displaced. It is reliably held on the same axis line without generating.

  Here, a case where the distance between the rim members 30 and 40 is adjusted in order to measure the uniformity of the tire TA having different inner peripheral width dimensions will be described with reference to FIG.

  First, the rotary shaft 20 is lowered, the rods of the cylinders 41f are engaged with the groove portions 41e, and the rods of the cylinders 31f are engaged with the groove portions 31e, respectively.

  Next, by expanding the diameter of each hydraulic chuck 32, 33, 42, 43, each rim holder 31, 41 and each rotary shaft 10, 20 can be rotated relatively, and the upper rotary shaft 10 can be arbitrarily set by the motor 11b. For example, 60 °. Thus, the rotation of the rim holder 31 is restricted by the respective cylinders 31f, and the rim holder 31 and the upper rotating shaft 10 are relatively rotated by 60 °, and the rim holder 31 is moved in the axial direction of the upper rotating shaft 10.

  Next, the lower rotating shaft 20 is rotated by an angle equal to the rotation direction of the upper rotating shaft 10 by the motor 21b. Thereby, the rotation of the rim holder 41 is restricted by each cylinder 41f, the rim holder 41 and the lower rotating shaft 20 are relatively rotated, and the rim holder 41 moves in the axial direction of the lower rotating shaft 20. As a result, the rim members 30 and 40 move by an equal distance in the opposite axial direction, and the rim member 30 and the rim member 40 can be adjusted to a predetermined interval.

  Here, since the rim members 30 and 40 are moved by an equal distance in the opposite axial direction, the axial direction between the rim members 30 and 40 even when the distance between the rim members 30 and 40 changes. The central position of the is not changed. Further, by rotating the rotary shafts 10 and 20 to positions where the notches 11e and 21e are detected by the tachometers 11f and 21f, the positions of the inclined surfaces 12d and the inclined surfaces 22d are always in the circumferential direction. It can arrange so that it may shift.

  Thereafter, the relative rotation between the rim holders 31 and 41 and the rotary shafts 10 and 20 is restricted by reducing the diameter of the hydraulic chucks 32, 33, 42, and 43.

  Thus, according to the tire holding device of the present embodiment, the plurality of inclined surfaces 12d that gradually inwardly incline toward the lower rotating shaft 20 on the inner peripheral surface of the engagement hole 12c of the upper rotating shaft 10. Are formed on the outer peripheral surface of the engaging protrusion 22c of the lower rotating shaft 20 and a plurality of inclined surfaces 22d that gradually incline toward the upper rotating shaft 10 are formed. Since the surface 22d is engaged, the rim members 30 and 40 attached to the rotary shafts 10 and 20 are positioned on the same axis line by the engagement of the inclined surfaces 12d and 22d, and the shafts are mutually connected. It is held at predetermined intervals in the direction. Further, when a large force acting in a direction away from each other is applied to the rim members 30 and 40 by applying an internal pressure to the tire TA, the inclined surfaces 12d and the inclined surfaces 22d abut each other in the axial direction, whereby the rim member 30 and the rim member 40 are reliably held on the same axis at the predetermined interval. Thereby, when measuring the uniformity of the tire, the tire TA can always be held at an appropriate position, and the measurement accuracy can be improved. Further, it is not necessary to provide a hydraulic cylinder with a large output or a complicated mechanism in order to resist the internal pressure applied to the tire TA, and the structure can be simplified and the durability can be improved.

  Further, after engaging each inclined surface 12d and each inclined surface 22d, the engaging member 13d of the middle shaft 13 that rotates integrally with the upper rotating shaft 10 is fixed to the lower rotating shaft 20. Since the engagement holes 22e are inserted into the engagement holes 22e, the engagement state between the inclined surfaces 12d and the inclined surfaces 22d during the uniformity measurement operation can be reliably maintained.

  Further, since the rim members 30 and 40 are screwed to the outer peripheral surfaces of the rotary shafts 10 and 20 so as to be movable in the axial direction, the rim members 30 and 40 and the rotary shafts 10 and 20 are relatively rotated. Thereby, the space | interval of the axial direction of each rim member 30 and 40 can be adjusted. That is, the axial distance between the rim members 30 and 40 can be arbitrarily adjusted according to the width of the inner peripheral portion of the tire TA. Here, since the axial interval between the rim members 30 and 40 can be adjusted steplessly according to the relative rotation angle between the rim members 30 and 40 and the rotary shafts 10 and 20, various sizes of the rim members 30 and 40 can be obtained. This is extremely advantageous when measuring the tire TA.

  In addition, while regulating the rotation of the rim members 30 and 40 and rotating the rotary shafts 10 and 20 by the motors 11b and 21b, the axial distance between the rim members 30 and 40 is adjusted. The distance between the rim members 30 and 40 in the axial direction can be adjusted according to the rotation angle of the rotary shafts 10 and 20 by the motors 11b and 21b, which is extremely advantageous when automating the adjustment work.

  In addition, the groove portions 31e and 41e extending in the vertical direction are provided on the outer peripheral surfaces of the rim members 30 and 40, and the rods of the cylinders 31f and 41f are engaged with the groove portions 31e and 41e, thereby rotating the rim members 30 and 40. Therefore, it is possible to allow the rim members 30 and 40 to move in the vertical direction while restricting the rotation of the rim members 30 and 40.

  Further, when adjusting the axial distance between the rim members 30 and 40, the motors 11b and 21b rotate the rotary shafts 10 and 20 by the same rotation angle so that the rim members 30 and 40 are axially opposite to each other. Therefore, the center position in the axial direction of the tire TA held by each rim member 30, 40 is always predetermined without changing the axial center position between the rim members 30, 40. Can be positioned at a height of Thereby, it is not necessary to adjust the position of the measuring device 5 in the height direction, and the structure of the tire measuring machine can be simplified.

  In addition, the hydraulic chucks 32, 33, 42, 43 are attached to the upper and lower ends of the rim holders 31, 41, and the diameters of the hydraulic chucks 32, 33, 42, 43 are reduced, so that the rim holders 31, 41 and Since the relative rotation with respect to the rotary shafts 10 and 20 is restricted, the rim members 30 and 40 can be reliably held at predetermined positions in the axial direction of the rotary shafts 10 and 20, and the uniformity can be measured. The accuracy can be further improved. Here, since the hydraulic chucks are provided at the upper end and the lower end of the rim holders 31 and 41, the rim holders 31 and 41 can be securely held on the rotary shafts 10 and 20, respectively. It is advantageous.

  In the present embodiment, the rotation of the rim members 30 and 40 is restricted, the rotation shafts 10 and 20 are rotated by the motors 11b and 21b, and the rotation angles of the rotation shafts 10 and 20 are adjusted. While the axial distance between the rim members 30 and 40 is adjusted, a position sensor composed of a well-known dial gauge is attached to each of the rotary shafts 10 and 20, and each rotary shaft 10 is controlled by the position sensor. , 20, and the axial position of each rim member 30, 40 is adjusted by detecting the axial position of each rim member 30, 40 and rotating each rotary shaft 10, 20 according to the detection result. Is also possible.

  In the present embodiment, each rim member 30 is used as an adjusting means for adjusting the axial distance between the rim members 30 and 40 by relatively rotating the rim members 30 and 40 and the rotary shafts 10 and 20. , 40 and the rotation shafts 10 and 20 are rotated by the motors 11b and 21b. However, another motor for rotating the rim members 30 and 40 is provided. The distance between the rim members 30 and 40 in the axial direction can be adjusted by the motors of the rim members 30 and 40 and the motors 11b and 21b of the rotary shafts 10 and 20.

  In the present embodiment, the engagement holes 12c and the engagement protrusions 22c are formed with three inclined surfaces 12d and 22d, but each inclined surface can be formed at two locations. It is also possible to have four or more locations.

  In the present embodiment, the rim members 30 and 40 are screwed to the outer peripheral surfaces of the rotary shafts 10 and 20 so as to be movable in the axial direction, but one of the rim members is fixed to the rotary shaft. The other rim member that is not fixed may be moved in the axial direction to adjust the interval between the rim members in the axial direction.

  In the present embodiment, the testing machine for performing the uniformity inspection of the tire TA is shown as having the tire holding device, but the inner peripheral portion of the tire TA such as a tire TA run-out measuring machine is formed by a pair of rim members. The present invention can be used for other devices as long as they are held.

1 is a partial sectional front view of a tire testing machine showing an embodiment of the present invention. Partial cross-sectional front view of tire testing machine Front sectional view of main parts of tire holding device The principal part perspective view of the tire holding device which shows the state before engaging an engagement protrusion and an engagement hole The principal part perspective view of the tire holding device which shows the state which engages an engagement protrusion and an engagement hole Front sectional view of the main part of the tire holding device showing a state in which the engagement protrusion of the middle shaft is engaged. Front sectional view of the main part of the tire holding device showing a state in which the axial interval of each rim member is changed

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Tire test machine main body, 2 ... Base, 3 ... Support | pillar, 4 ... Frame, 5 ... Measuring apparatus, 6 ... Conveyor, 10 ... Upper rotating shaft, 11 ... Rotating shaft main body, 11b ... Motor, 11d ... Screw part, DESCRIPTION OF SYMBOLS 12 ... Engagement member, 12c ... Engagement hole, 12d ... Inclined surface, 13 ... Medium shaft, 13d ... Locking protrusion, 20 ... Lower rotating shaft, 21 ... Rotating shaft main body, 21b ... Motor, 21d ... Screw part, 22 ... engaging member, 22c ... engaging protrusion, 22d ... inclined surface, 22e ... locking hole, 30 ... rim member, 31 ... rim holder, 31e ... groove, 31f ... cylinder, 32 ... hydraulic chuck, 33 ... hydraulic chuck, 34 ... rim, 40 ... rim member, 41 ... rim holder, 41e ... groove, 41f ... cylinder, 42 ... hydraulic chuck, 43 ... hydraulic chuck, 44 ... rim, TA ... tire.

Claims (5)

A tire that includes a pair of support shafts that are axially opposed to each other and a pair of rim members that are respectively attached to opposing ends of each support shaft, and each rim member holds the tire at a predetermined axial position. In the holding device,
An engaging protrusion extending toward the other support shaft is provided on the tip side of one support shaft, and inclined surfaces that are inclined radially outward toward the other support shaft side are circumferentially arranged on the outer peripheral surface of the engagement protrusion. Formed at multiple locations at intervals in the direction,
An engagement hole into which an engagement protrusion can be inserted is provided on the distal end side of the other support shaft, and inclined surfaces that are inclined radially inward toward the one support shaft side are formed on the inner peripheral surface of the engagement hole. Formed at multiple locations at intervals in the circumferential direction,
The engagement protrusion and the engagement hole are engaged in the axial direction by aligning the positions of the inclined surfaces in the circumferential direction, and the axial engagement is released by shifting the positions of the inclined surfaces in the circumferential direction. To be formed and
Each rim member is provided with a screw portion on the inner peripheral surface of each rim member, and a screw portion is provided on the outer peripheral surface of each support shaft, and the screw portion of each rim member is screwed to the screw portion of each support shaft. Are screwed to the outer peripheral surface of each spindle so as to be movable in the axial direction.
On one of the rim member, to restrict the relative rotation of the one of the one rim member and one of the support shaft holding the threaded portion of the outer peripheral surface of the support shaft by diameter inner peripheral surface, the inner peripheral A hydraulic chuck is provided that allows one rim member and one spindle to rotate relative to each other by enlarging the surface.
The other rim member, by reducing the diameter of the inner circumferential surface to grip the screw portion of the outer peripheral surface of the other shaft to restrict the relative rotation of the other rim member and the other shaft, the inner peripheral A hydraulic chuck is provided that allows the other rim member and the other spindle to rotate relative to each other by expanding the surface.
The hydraulic chuck is provided on one end side and the other end side of the rim member in the spindle axis direction ,
Rotating means for relatively rotating each rim member and each support shaft so that each rim member moves by an equal distance in the opposite axial direction with respect to each support shaft is provided. Tire holding device. The tire holding device according to claim 1 , further comprising holding means capable of holding the engaging protrusion and the engaging hole in a state where the inclined surfaces of the engaging protrusion and the engaging hole are aligned in the circumferential direction. The holding means is composed of one locking portion provided on one tip side of each support shaft so as to be movable in the axial direction and the other locking portion provided on the tip side of the other support shaft, 3. The tire according to claim 2 , wherein the engaging portions are formed so that the engaging protrusions and the engaging holes can be locked in the circumferential direction with their inclined surfaces aligned in the circumferential direction. Holding device. Said rotating means, rotating the rotation regulating mechanism capable restricting the rim member, one of claims 1, 2 or 3, characterized by being configured to pivot from an arbitrary angle by a rotatable turning mechanism The tire holding device according to 1. Wherein the rotation regulating mechanism, a groove which is provided so as to extend in the axial direction of the support shaft on an outer peripheral surface of the rim member, to claim 4, characterized in that consisted an engaging member engaged detachably in the groove The tire holding device according to the description.

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