JP6039882B2 - Tire attaching / detaching device and tire removing method - Google Patents

Description

  The present invention relates to a tire detaching apparatus and a tire detaching method capable of detaching a tire from a wheel and attaching the tire to the wheel.

  A typical prior art is described in Patent Document 1, for example. In this prior art, a tire with high rigidity, also called a flat tire, is difficult to remove and install from a wheel by human power, so a tire attaching / detaching device, also called a tire changer or a tire changer, is used. Such a tire attaching / detaching device is disclosed in Patent Document 1, for example.

  In this prior art, when the tire is removed from the rim portion, the upper arm is moved while the pressing arm is lowered, the rotating table is rotated, the upper bead portion and the sidewall portion of the tire are pushed down by the bead roller, and the rotating table is rotated. Drop the part into the drop part of the wheel. At this time, the bead roller is in a freely rotatable state and is driven by the rotation of the tire and the wheel. When the tire and the wheel rotate once, the upper beat portion is dropped into the drop portion of the wheel over the entire circumference.

  Thereafter, a protrusion of the mounting head as a bead guide member is inserted between the upper rim portion and the upper bead portion of the wheel. At this time, the upper bead portion in the vicinity of the insertion point of the protruding portion is pushed down by the bead roller to facilitate the insertion of the protruding portion. Further, the upper bead and the sidewall on the side opposite to the insertion point of the protrusion of the mounting head by 180 degrees in the circumferential direction are pressed by the bead roller, and the upper rim and the upper bead in the vicinity of the mounting head In the middle, the operator inserts the tip of the tire lever and rotates the rotary table in a state where the upper bead is positioned above the upper rim so that the upper bead is Pulled upward from the rim.

  Next, by inserting the peripheral edge portion of the bead roller between the lower bead portion and the upper rim portion of the tire and rotating the rotary table, the tire is pushed upward, and the tire is removed from the wheel.

  As described above, this prior art is configured such that even a highly rigid tire such as a flat tire can be removed from the wheel by one operator.

  Further, when the tire is mounted on the wheel, the lower bead portion of the tire is fitted into the wheel from the upper rim portion of the wheel, and the mounting head is set at a position where the upper bead portion of the tire is easily fitted on the wheel. At the same time, the bead roller is locked and positioned so that the pivot center of the swing arm is located on the rotation axis of the rotary table, and then the swing of the swing arm is locked and the bead roller is lowered together with the swing arm. Then, the position near the downstream side in the rotation direction of the mounting head on the sidewall portion of the tire is pressed to lock the bead roller so that it does not rotate. In this state, by rotating the rotary table, the bead roller rotates following the tire while pressing the sidewall portion of the tire, and the upper bead portion of the tire is rotated above the wheel by the mounting head and the bead roller. Fits inside the rim.

  As described above, in this prior art, when the tire is mounted on the wheel, the rotation of the bead roller is locked to follow the rotation of the tire to maintain the pressed state, and the elastic recovery force of the tire causes the upper bead portion to move above the wheel. It is configured to prevent the tire from returning upward from the rim portion, and even a highly rigid tire such as a flat tire can be mounted on the wheel by one worker.

JP-A-6-255328

  In the above-described prior art, a tire attached to or removed from a wheel is intended for a tire having high rigidity such as a flat tire, but a tire reinforced with a metal wire or carbon fiber in recent years. In this case, the rigidity of the tire is higher than that of the flat tire described above, and even when the tire is removed from the wheel, even if the upper bead portion is pressed and pushed down by the mount press roller, The protrusion of the mounting head is interposed between the upper bead part and the tire bead is manually inserted between the upper bead part and the upper rim part, and the upper bead part is separated from the upper rim part upward. Therefore, a large force must be applied to the upper bead portion from the protrusion of the mounting head and the tire lever. Resulting in damage to the bead portion on top of the ear.

  When the upper bead portion is damaged in this way, when the tire is mounted on the wheel, the adhesion between the upper rim portion and the upper bead portion is lowered, and it becomes difficult to maintain an appropriate air pressure for a long time. There's a problem.

  In addition, when the ultra-rigid tire reinforced with the above-described wire or carbon fiber is pressed by the bead roller in the vicinity of the mounting head on the downstream side in the rotation direction, the tire extends from the upper bead portion to the sidewall portion and the shoulder portion. There is a problem that the wire and the carbon fiber are broken by being greatly deformed into a substantially U shape or a substantially V shape.

  An object of the present invention is to provide a tire attaching / detaching device that can easily and quickly remove a tire from a wheel while preventing damage and preventing breakage of a reinforcing material such as a wire and carbon fiber even in a highly rigid tire. And providing a tire removal method.

The present invention comprises a rotary table that detachably holds a lower rim portion of a wheel and that rotates the wheel around a vertical rotation axis.
The upper bead portion is guided so that the upper bead portion of the tire is fitted to the upper rim portion of the wheel held on the rotary table, and the upper portion of the tire fitted to the upper rim portion of the wheel is guided. A bead guide member for guiding the bead part so as to be detached from the upper rim part, the bead support part being parallel to a virtual horizontal plane perpendicular to the rotation axis and supporting the lower bead part of the tire from below; A bead guide member having a tapered shape facing the downstream side in the rotation direction of the rotary table, and having an insertion portion inserted between the upper bead portion and the upper rim portion;
The lower bead portion of the tire with the upper bead portion removed from the upper rim portion of the wheel is pressed from the lower side to the upper side at a position close to the downstream side in the rotational direction of the bead guide member, and the wheel And a demounting roller for detaching the lower bead portion of the tire from the upper rim portion.
Further, the present invention includes a frustoconical circumferential pressing surface having a diameter that decreases as the distance from the rotation axis increases, and is close to the bead guide member from the position where the bead guide member is disposed. Also, the upper bead portion of the tire mounted on the wheel is pushed from above to the drop portion from the upper rim portion of the wheel by a part of the pressing surface at a position downstream in the rotation direction of the rotary table. Including a bead roller to press,
The demounting roller has an angle formed by a first virtual one plane including a position where the rotation axis and the bead guide member are disposed, and a second virtual one plane including a pressing position by the rotation axis and the bead roller. Is provided in a range of 30 ° or more and less than 90 °.
In the present invention, the wheel on which the tire is mounted is fixed to the rotary table.
The bead support portion that is parallel to a virtual horizontal plane perpendicular to the rotation axis of the turntable and that supports the lower bead portion from below, is tapered toward the downstream side in the rotation direction of the turntable, and has an upper bead portion and an upper bead portion. A bead guide member having an insertion portion inserted between the rim portion, the insert portion of the bead guide member being inserted between the upper bead portion of the tire and the upper rim portion of the wheel; The upper bead portion of the tire is detached from the upper rim portion of the wheel while rotating the rotary table,
The lower bead portion of the tire from which the upper bead portion is separated from the upper rim portion of the wheel is supported from below by the bead support portion of the bead guide member, and close to the downstream side in the rotational direction of the bead guide member. A tire detaching method characterized in that a rotating table is rotated in a state of being pressed from below to above by a demount roller disposed at a position, and the lower bead portion of the tire is released from the upper rim portion of the wheel. .

According to the present invention, the lower bead is supported from below by the bead support portion of the bead guide member, and the lower bead portion of the tire fitted to the wheel is pressed upward from below by the demount roller. Since the upper bead portion can be detached from the upper rim portion of the tire, a rigid tire can be detached from the wheel without generating a large tension on the tire. Can be removed from the wheel. In addition, since the bead guide member has an insertion portion, the insertion portion can be inserted so as to interrupt between the upper rim portion and the upper bead portion, and the upper bead portion can be detached from the upper rim portion without being damaged. it can.

1 is a front view showing a tire attaching / detaching device 1 according to an embodiment of the present invention. It is a top view of the tire attaching / detaching apparatus 1 seen from the upper part of FIG. It is the left view of the tire attaching / detaching apparatus 1 seen from the left side of FIG. FIG. 2 is a right side view of the tire attaching / detaching device 1 as seen from the right side of FIG. 1. 4 is an enlarged perspective view of a bead guide member 6. FIG. It is a side view which shows the bead press apparatus B. FIG. FIG. 3 is a view showing a state in which a bead roller 21 presses a tire T. 4 is a plan view of a tire pressing member 35 used in the mount press apparatus C. FIG. FIG. 9 is a side view of the tire pressing member 35 as viewed from below in FIG. 8. It is sectional drawing seen from the cut surface line XX of FIG. It is sectional drawing seen from the cut surface line XI-XI of FIG. It is a figure for demonstrating the procedure which makes upper bead part TB2 detach | leave from upper rim | limb part WR2, FIG. 12A (1) has arrange | positioned the bead breaker 50 in the upper bead part TB2 vicinity in the state which stood the wheel already-attached tire. 12 (2) shows a state in which the valve V of the wheel W on the rotary table 4 is set at a position downstream of the bead guide member 6, and FIG. 12A (3) shows the upper bead portion TB2 in the upper rim. The state which made it detach | leave on part WR2 is shown. It is a figure for demonstrating the procedure which makes upper bead part TB2 detach | leave from upper rim part WB2, FIG. 12B (4) shows the state which lifted the bead guide member 6, and pushed down the other side, FIG. 12B (5) A state in which the tire T is pushed upward from below by the demount roller 51 is shown.

  FIG. 1 is a front view showing a tire attaching / detaching device 1 according to an embodiment of the present invention, FIG. 2 is a plan view of the tire attaching / detaching device 1 viewed from above in FIG. 1, and FIG. FIG. 4 is a left side view of the tire attaching / detaching device 1 as seen, and FIG. 4 is a right side view of the tire attaching / detaching device 1 as seen from the right side of FIG. The tire attaching / detaching device 1 of the present embodiment is used to implement a tire mounting method and a tire detaching method. The tire attaching / detaching device 1 of the present embodiment basically includes a bead portion guiding device A, a bead press device B, and a mount press device C.

  First, the structure of the bead part guide apparatus A will be described. The bead portion guide device A is equipped with a wheel W, a lower rim portion WR1 of the wheel W is detachably held and rotationally driven in the direction of an arrow D around a vertical rotation axis L1, and a rising direction The elevating arm 5 provided to be displaceable in the descending direction, the bead guide member 6 provided at the lower end of the elevating arm 5, and the elevating arm 5 are held and displaced in the front-rear direction approaching / separating from the rotation axis L1. It includes a horizontal arm 7 and a support column 8 that tilts in a direction approaching / separating from the rotation axis L1 with a horizontal axis L2 at the lower end as a rotation center.

  The turntable 4 includes chuck means 40 that detachably holds a wheel W placed coaxially with the rotation axis L1. This chuck means 40 has four chuck claws 41 that are axially symmetrical with respect to the rotation axis L1, and each chuck claw 41 is mounted on a slider 43 and is moved toward and away from each other by a double-action pneumatic cylinder C1 (not shown). Displacement driven. These chuck claws 41 can sandwich the lower rim portion WR1 of the mounted wheel W from the outside in the radial direction, and can hold the wheel W on the same axis as the rotation axis L1. Further, when the chuck claws 41 are displaced in directions away from each other, the sandwiched state of the wheel W is released, and the wheel W can be removed from the rotary table 4.

  The base 53 of the rotary table 4 includes a column tilting pedal Ps for operating the column 8 to be turned over and inverted, a chucking pedal Pc for opening and closing the slider 41 and fixing and releasing the wheel W, and a bead breaker unit. A bead breaker pedal Pb for pressing the blade 54 in the bead pressing direction, that is, a direction close to the base 53 and releasing the pressing force, and a rotation command pedal for instructing forward / reverse operation of the rotary table 4 Pr is provided.

  FIG. 5 is an enlarged perspective view of the bead guide member 6. The bead guide member 6 is an attachment member that is detachably attached to the lower end portion of the lifting arm 5 made of steel or stainless steel by a bolt or the like, and is a wheel W of the attached tire T set on the rotary table 4. On the other hand, while being engaged with the upper rim portion WR2 of the wheel W, the bead support portion 11 that supports the lower bead portion TB1 from below and guides it in the moving direction, the upper rim portion WR2, and the upper rim portion WR2 are in close contact with each other. And an insertion portion 12 that is inserted by being inserted between the upper bead portions TB2. The bead support portion 11 is parallel to a virtual horizontal plane perpendicular to the rotation axis L1. The insertion portion 12 is formed in a substantially spherical shape that is tapered toward the downstream side in the rotation direction D of the turntable 4.

  FIG. 6 is a side view showing the bead press apparatus B. FIG. The bead press device B is provided on the turntable 4 so as to be displaceable in an ascending direction away from the turntable 4 and a drop direction close to the turntable 4, and a horizontal axis perpendicular to the rotation axis L1 of the turntable 4 A bead press arm 20 provided to be displaceable in a forward direction E1 close to the rotation axis L1 and a backward direction E2 away from the rotation axis L1, and the bead press arm 20 near the rotation axis L1. The bead roller 21 is rotatably held in a state where the upper bead portion TB2 of the tire T mounted on the turntable 4 is pressed, and the bead press arm 20 is held movably in the longitudinal direction. Arm holding portion 22 (see FIG. 1). The arm holding portion 22 may be realized by a pneumatic linear cylinder or a linear slider.

The bead roller 21 has a frustoconical circumferential pressing surface 21a that becomes smaller in diameter as it moves away from the rotation axis L1. The bead roller 21 includes a vertical hypothesis including the axis of the bead press arm 20 and the rotation axis L1 of the rotary table 4. in one plane, so as to face the bottom surface to the rotational axis L1, it is rotatably provided about the axis L 7 inclined in a direction away from the rotational axis L1 as they become downward.

  Such a bead roller 21 has an upper bead portion TB2 of the tire T mounted on the wheel W at a position near the predetermined angle φ downstream of the rotational direction from the position where the bead guide member 6 is disposed. Can be pressed by a part of the pressing surface from above. The predetermined angle φ is not less than 30 ° and less than 90 ° from the virtual plane including the position where the rotation axis L1 and the bead guide member 6 are arranged to the downstream side in the rotation direction D of the turntable 4 (30 ° ≦ φ <90 °). That is, the bead roller 21 includes a first virtual plane including a position at which the rotation axis L1 and the bead guide member 6 are disposed, and a second virtual one including a position pressed by the rotation axis L1 and the bead roller 21. The angle formed by the plane is set in a range of 30 ° or more and less than 90 °.

Also, the pressing surface 21a is a virtual plane perpendicular to the rotational axis L1, i.e. chosen an angle θ with respect to the horizontal plane. This angle θ is selected from 30 ° to 60 °, preferably 45 °.

  FIG. 7 is a view showing a state in which the bead roller 21 presses the tire T. The bead roller 21 has the pressing surface 21a formed in the shape of a circular truncated cone as described above. When the bead roller 21 presses the upper bead portion TB2 of the tire T, the pressing surface 21a It expands as indicated by virtual lines S1, S2, S3 from the vicinity of the upper bead portion TB2 toward the shoulder portion TS, and also expands in the circumferential direction.

  On the other hand, if the angle θ2 of the pressing surface 21a with respect to the horizontal plane is less than 30 °, as indicated by phantom lines S11, S12, S13, the upper bead portion TB2 is greatly enlarged from the shoulder portion TS, and the tire T is lifted up. The region extending from the bead portion TB2 through the sidewall portion TW to the shoulder portion TS is pressed into a substantially U-shape or substantially V-shape, and a reinforcing material such as a wire or carbon fiber is inserted. In the case of the tire T, the tire T may be damaged and the reinforcing material may be broken. However, according to the bead roller 21 of the present embodiment, such a problem does not occur.

  8 is a plan view of a tire pressing member 35 used in the mount press apparatus C, FIG. 9 is a side view of the tire pressing member 35 as viewed from below in FIG. 8, and FIG. 10 is a cross-sectional line X of FIG. FIG. 11 is a cross-sectional view taken along the line XI-XI in FIG. 8. Referring also to FIGS. 1 to 3, the mount press device C is provided adjacent to the rotary table 4, and moves up and down along a moving path parallel to the rotation axis L <b> 1 of the rotary table 4. The lifting and lowering means 31, the swinging body 32 of the lifting and lowering means 31, a swing arm 32 that is rotatably connected about an axis L 3 parallel to the rotation axis L 1 of the rotary table 4, and the swing table 32 A first arm 33 rotatably connected about an axis L4 parallel to the rotation axis L1 and a second arm rotatably connected to the swing arm 32 about the axis L4 above the first arm 33. 34 and a tire pressing member 35 provided on the second arm 34 so as to be movable along the second arm 34. The raising / lowering means 31 is realized by a double-action pneumatic cylinder.

  The tire pressing member 35 holds the tire T in a region on the downstream side in the rotational direction D with respect to the position where the bead roller 21 is disposed and on the upstream side in the rotational direction D with respect to the position where the bead guide member 6 is disposed. In a state where the plate-like pressing portion 36 is pressed from above, and the tire T is pressed from above by the pressing portion 36, the swing arm 32, the first and second arms 33, 34 are angularly displaced, It can move following the rotation of the tire T.

  The tire pressing member 35 includes the plate-shaped pressing portion 36, a side wall portion 37 rising upward from one side portion of the pressing portion 36, and a pair of ribs 38a and 38b connected to the side wall portion 37 and the pressing portion 36. And a lower end portion of a connecting shaft 39 that connects the second arm 34 and the tire pressing member 35 is inserted and rotatably connected about the axis L6 of the connecting shaft 39, and is integrated with the side wall portion 37 and the pressing portion 36. The boss part 40 is formed. Such a tire pressing member 35 may be made of a material having high strength, excellent impact resistance and wear resistance, and good slipperiness with respect to the tire T, such as polycarbonate.

12A and 12B are views for explaining a procedure for detaching the upper bead portion TB2 from the upper rim portion WR2, and FIG. 12A (1) shows that the bead breaker 50 is placed on the upper bead in a state where the wheel-attached tire is raised. parts showing a state disposed near TB2, FIG 12 a (2) shows a state set at the position of the downstream side of the bead guide member 6 a valve V of the wheel W on the rotary table 4, FIG. 12A (3) is A state in which the upper bead portion TB2 is detached onto the upper rim portion WR2 is shown. 12B (4) shows a state where the bead guide member 6 is lifted and the opposite side is pushed down, and FIG. 12B (5) shows a state where the tire T is pushed upward from below by the demount roller 51.

  When removing the existing tire T attached to the wheel W, the air in the tire T is completely removed, and the tire T is vertically arranged on the bead breaker 50 provided on the side portion of the base 53, As shown in FIG. 12A (1), the blade 54 of the bead breaker 50 is set with ΔL1 = 10 mm to 20 mm away from the wheel W. In this state, the bead breaker pedal Pb is depressed, the blade 54 is driven in the direction close to the tire T, and the vicinity of the upper bead portion TB2 of the tire T is pressed and dropped to the drop portion side of the wheel W. Thereafter, the tire T is turned over, the same operation is performed, and the lower bead portion TB1 is dropped to the drop portion side of the wheel W.

  Next, the bead guide member 6 is retracted rearward, and the wheel with tire W is mounted on the rotary table 4. At this time, the slider 43 is adjusted to the wheel size by operating the chucking pedal Pc, and the chucking pedal Pc is stepped on to move the four chuck claws 41 toward each other, and the lower rim portion WR1 of the wheel W is moved. Clamp and fix.

  When the tire-equipped wheel W is thus mounted on the turntable 4, as shown in FIG. 12A (2), the upper rim portion of the upper bead portion TB2 of the tire T on which the bead guide member 6 is mounted on the turntable 4 is provided. The elevator arm 5 is lowered and positioned so as to reach the vicinity of WR2, while adjusting the forward and backward directions, and the elevator arm 5 is further lowered from the state where the bead guide member 6 is in contact with the upper bead portion TB2. The upper bead portion TB2 is pressed and pushed down by the lower portion of the bead guide member 6, and the upper bead portion TB2 is separated from the upper rim portion WR2.

  In this state, as shown in FIG. 12A (3), the tip of the tire lever is inserted into the gap generated between the upper bead portion TB2 and the upper rim portion WR2, and the tire lever is pushed down like a lever to The upper bead portion TB2 is turned up by being displaced, and the upper bead portion TB2 is completely placed on the bead guide member 6. Thereafter, the tire lever is removed and the turntable 4 is rotated in the rotation direction D, whereby the upper bead portion TB2 is separated upward from the upper rim portion WR2 of the wheel W and removed.

At this time, as shown in FIG. 12B (4), a region on the side opposite to the bead guide member 6, More particularly, the direction of rotation D downstream and said bead guide the position where the bead roller 21 is arranged In a region upstream of the rotational direction D from the position where the member 6 is disposed, the tire T is pressed from above with the plate-like pressing portion 36 of the tire pressing member 35 in a wide area in the circumferential direction and the width direction. And push down. As a result, even in the case of the tire T having high rigidity, the vicinity of the mounting position of the bead guide member 6 of the upper bead portion TB2 of the tire T can be further separated from the upper rim portion WR2 of the wheel W, and the upper bead portion can be easily pushed. TB2 can be detached upward from the upper rim portion WR2.
Further, the rigidity of the tire T when higher, the de-mount roller 51 is used. The demount roller 51 includes a first virtual plane including a position where the rotation axis L1 and the bead guide member 6 are disposed, and a second virtual one including a position pressed by the rotation axis L1 and the bead roller 21. The angle formed by the plane is set in a range of 30 ° or more and less than 90 °. When such a demount roller 51 is used, in a state where the wheel W on which the tire T is mounted is fixed to the rotary table 4 and the upper bead portion TB2 of the tire T is locked to the bead guide member 6, The tire T, which is separated from the wheel W while rotating the rotary table 4 and the upper bead portion TB2 is separated from the wheel W, is disposed at a position close to the downstream side in the rotational direction D of the bead guide member 6. The rotary table 4 can be rotated in a state of being pressed upward from below by the mounting roller 51, and the lower bead portion TB1 can be smoothly and quickly detached from the upper rim portion WR2 of the wheel W.

  As a result, even if the tire T is a flat tire and is a highly rigid tire reinforced with a metal wire, the upper bead portion TB2 and the upper bead portion TB2 are placed in a state where the bead guide member 6 is sufficiently close to the upper rim portion WR2. The upper bead portion TB2 can be inserted smoothly between the rim portion WR2 and the upper bead portion TB2 can be smoothly inserted without being pressed by the bead guide member 6 with a large pressing force. Damage to the member 6 during insertion is prevented.

  In this way, the bead guide member 6 can be inserted between the upper bead portion TB2 at a position as close as possible to the outer peripheral surface of the upper rim portion WR2, so that the upper bead portion TB2 is pressed with an unnecessarily large force. Thus, no scratches or scratches due to contact with the bead guide member 6 occur, and the damage to the tire T can be greatly reduced compared to the conventional case.

  Further, when the upper bead portion TB2 is detached from the upper rim portion WR2, a large force does not act on the upper bead portion TB2 from the bead guide member 6, so that the bead guide member between the upper bead portion TB2 and the upper rim portion WR2 is used. 6 can be smoothly inserted, whereby the tire replacement operation can be facilitated and speeded up.

  Next, the operation at the time of tire mounting will be described. As shown in FIG. 2, the bead roller 21 is disposed immediately above the upper bead portion TB2 of the tire T mounted on the rotary table 4 together with the wheel W, in the vicinity of the upper rim portion WR2. Since the tire T mounted on the wheel W on the rotary table 4 is driven to rotate about the rotation axis L1, the bead roller follows the rotation of the tire T because it can rotate about the axis L3 in a state where TB2 is pressed. 21 also rotates around the axis L3. When the bead press arm 20 is lowered in this state, the upper bead portion TB2 rotates in the circumferential direction while being pushed down by the bead roller 21, and even with the tire T having high rigidity, the upper bead portion TB2 is pressed with a large force. Thus, the upper bead portion TB2 can be pushed into the drop portion from the upper rim portion WR2 and reliably separated.

The pressing surface 21a of the bead roller 21 is formed in the shape of a truncated cone that tapers toward the rotation axis L1 of the turntable 4 and becomes tapered as the distance from the rotation axis L1 increases. The bead roller 21 has an axis L3 inclined in a direction away from the rotation axis L1 as it goes downward on a virtual plane including the axis of the bead press arm 20 and the rotation axis L1 of the rotary table 4. It provided rotatably about the axis L 7.

  Since the bead roller 21 having the annular frustoconical circumferential pressing surface 21a is provided in an inclined manner, a part of the pressing surface 21a of the bead roller 21 is brought into contact with the bead portion TB in a large area. In addition, at the pressing position of the upper bead portion TB2 by the bead roller 21, a large sliding frictional force does not act on the upper bead portion TB2 from the bead roller 21 in a direction different from the tangential direction. As a result, even if the upper bead portion TB2 is pressed with a large force by the bead roller 21, a large force does not act locally on the upper bead portion TB2 from the bead roller 21, and the bead roller 21 moves in a direction shifted from the tangential direction. The sliding frictional force slidably contacting the portion TB2 is small, and the upper bead portion TB2 is prevented from being damaged by the bead roller 21.

Furthermore, since the outer peripheral surface of the bead roller 21 has a truncated cone shape, the roller moving means 22 moves the bead roller 21 in a direction close to the rotation axis L1 of the turntable 4 at a position close to the upper rim portion WR2. However, the bead roller 21 is prevented from interfering with the upper rim portion WR2, and the bead portion TB can be pushed down to the vicinity of the drop portion to more reliably separate the bead portion TB from the upper rim portion WR2.

DESCRIPTION OF SYMBOLS 1 Tire attaching / detaching apparatus 4 Rotary table 5 Lifting arm 6 Bead guide member 8 Support | pillar 11 Bead support part 12 Insertion part 20 Bead press arm 21 Bead roller 22 Arm holding part 21a Pressing surface 30 Lifting body 31 Lifting means 32 Swing arm 33 1st arm 34 Second arm 35 Tire pressing member 36 Press part 37 Side wall part 38a, 38b Rib 39 Connecting shaft 37a Boss part 40 Chuck means 41 Chuck claw 43 Slider 51 Demount roller 54 Blade A Bead part guide apparatus B Bead press apparatus C Mount press Device C1 Double acting pneumatic cylinder D Rotation direction of rotary table 4 E1 Forward direction E2 Backward direction L1 Rotation axis Pb Bead breaker pedal Pc Chucking pedal TB1 Lower bead part TS Shoulder part V Wheel W valve W Eel WR1 lower rim portion WR2 above the rim

Claims (3)

A rotary table that detachably holds a lower rim portion of the wheel, and rotates the wheel around a vertical rotation axis;
The upper bead portion is guided so that the upper bead portion of the tire is fitted to the upper rim portion of the wheel held on the rotary table, and the upper portion of the tire fitted to the upper rim portion of the wheel is guided. A bead guide member for guiding the bead part so as to be detached from the upper rim part, the bead support part being parallel to a virtual horizontal plane perpendicular to the rotation axis and supporting the lower bead part of the tire from below; A bead guide member having a tapered shape facing the downstream side in the rotation direction of the rotary table, and having an insertion portion inserted between the upper bead portion and the upper rim portion;
The lower bead portion of the tire with the upper bead portion removed from the upper rim portion of the wheel is pressed from the lower side to the upper side at a position close to the downstream side in the rotational direction of the bead guide member, and the wheel And a demounting roller for detaching the lower bead portion of the tire from the upper rim portion. It has a frustoconical circumferential pressing surface that becomes smaller in diameter as it moves away from the rotation axis, and is closer to the bead guide member than the position where the bead guide member is disposed. A bead roller that presses the upper bead portion of the tire attached to the wheel from above to the drop portion from the upper rim portion of the wheel at a position downstream of the rotation direction by a part of the pressing surface; ,
The demounting roller has an angle formed by a first virtual one plane including a position where the rotation axis and the bead guide member are disposed, and a second virtual one plane including a pressing position by the rotation axis and the bead roller. The tire attaching / detaching device according to claim 1, wherein is provided in a range of 30 ° or more and less than 90 °. Fix the wheel with tires on the rotating table,
The bead support portion that is parallel to a virtual horizontal plane perpendicular to the rotation axis of the turntable and that supports the lower bead portion from below, is tapered toward the downstream side in the rotation direction of the turntable, and has an upper bead portion and an upper bead portion. A bead guide member having an insertion portion inserted between the rim portion, the insert portion of the bead guide member being inserted between the upper bead portion of the tire and the upper rim portion of the wheel; The upper bead portion of the tire is detached from the upper rim portion of the wheel while rotating the rotary table,
The lower bead portion of the tire from which the upper bead portion is separated from the upper rim portion of the wheel is supported from below by the bead support portion of the bead guide member, and close to the downstream side in the rotational direction of the bead guide member. A tire detaching method, wherein a rotating table is rotated in a state of being pressed from below to above by a demount roller disposed at the position, and the lower bead portion of the tire is detached from the upper rim portion of the wheel.

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