JP5446169B2 - Tire assembly aid and tire assembly method using the same - Google Patents

Description

  The present invention relates to a tire assembly auxiliary tool used when a pneumatic tire is assembled to a rim of a wheel, and a tire assembly method using the same, and more particularly, to a pneumatic tire having a high side rigidity. The present invention relates to a tire assembling auxiliary tool that enables easy and safe operation of assembling to a tire and a tire assembling method using the same.

  When assembling a pneumatic tire to a wheel rim, use a tire changer, fit one bead part of the pneumatic tire into the wheel rim, and then use a roller to place a part of the other bead part of the pneumatic tire. The inside of the rim flange is dropped, and the dropping portion by the roller is extended in the tire circumferential direction, and the other bead portion is fitted to the rim over the entire circumference in the same manner as one bead portion.

  However, when a pneumatic tire with a high side portion rigidity such as a flat tire having a large inner diameter is assembled to the rim, the bead portion dropped inside the rim flange by the roller tends to return to the outside of the rim flange. Since the force is large, a plurality of workers insert a rod-shaped tire assembly aid called a tire lever (see, for example, Patent Document 1) between a rim flange and a bead portion at a plurality of locations on the tire circumference. Generally, the tire assembly work is performed while preventing the part from returning.

However, in this case, not only a plurality of workers are required for the tire assembling work, but also the tire lever is slippery, so that the workability is bad, and if the tire lever comes off between the rim flange and the bead portion, the worker collides with the worker. There is also. Further, as a substitute for a tire lever, a tire assembly assisting tool (see, for example, Patent Document 2) that has a bifurcated leg structure and elastically engages with a rim flange has been proposed. Such a tire assembling aid is not always able to exert a sufficient assisting function because a pneumatic tire having high side portion rigidity is easily detached by the reaction force of the bead portion when it is assembled to the rim. .
Japanese Utility Model Publication No. 55-36017 JP 2006-264604 A

  An object of the present invention is to provide a tire assembling auxiliary tool and a tire assembling method using the same, which can easily and safely perform an operation of assembling a pneumatic tire having a high side portion rigidity to a rim. It is in.

In order to achieve the above object, a tire assembling aid of the present invention is a tire assembling aid used when assembling a pneumatic tire to a rim of a wheel, and is fixed to a bead seat portion of the rim. A pressing portion that extends from the fixed portion toward the outer side in the wheel radial direction and presses the side portion of the pneumatic tire from the outside, and an extending portion that extends from the pressing portion to the back side of the bead seat portion. A fastening portion configured to be movable forward and backward toward the fixing portion by a fastening screw screwed into a screw hole penetrating the extension portion, and the rim is provided between the fixing portion and the extension portion. Rutotomoni provided a gap for accommodating the flange, and a tire side portion side arms extending in the tire bead portion side arm and the wheel radially extending axial direction of the wheel to the pressing portion is provided, said tire bead arm The length is 30 mm to 60 mm, the length of the tire side arm is 80 mm to 150 mm, and the pressing surface of the tire bead portion side arm and the pressing surface of the tire side portion side arm intersect each other, The inclination angle of the pressing surface of the tire bead portion side arm with respect to the axial direction of the fastening screw is 90 ° to 120 °, and the inclination angle of the pressing surface of the tire side portion side arm with respect to the axial direction of the fastening screw is 20 °. It is characterized by being set to ˜50 ° .

  On the other hand, the tire assembling method of the present invention for achieving the above object is a method of assembling a pneumatic tire to a rim of a wheel using the tire assembling auxiliary tool, and one bead portion of the pneumatic tire. Is inserted into the rim of the wheel, a part of the other bead part of the pneumatic tire is dropped inside the rim flange by a roller, and the tire assembly assisting tool is attached to the bead seat part of the rim at that site. It mounts | wears with the said tire assembly auxiliary | assistance tool pressing the side part of the said pneumatic tire, and the dropping part by the said roller is extended in a tire circumferential direction.

  The tire assembly assisting tool of the present invention includes a fixed portion fixed to the bead seat portion of the rim, and a pressing portion that extends from the fixed portion toward the outer side in the wheel radial direction and presses the side portion of the pneumatic tire from the outside. A fastening portion configured to extend from the pressing portion to the back side of the bead sheet portion, and to be moved forward and backward toward the fixed portion by a fastening screw screwed into a screw hole penetrating the extension portion. And a space for accommodating the flange of the rim is provided between the fixing portion and the extension portion, so that the rim is firmly fixed to the bead seat portion of the rim based on the tightening force of the tightening screw.

  Therefore, after fitting one bead part of the pneumatic tire into the rim of the wheel, a part of the other bead part of the pneumatic tire is dropped inside the rim flange by a roller, and the bead seat part of the rim at that part A tire assembly aid is attached to the tire, and the side portion of the pneumatic tire is pressed by the tire assembly aid to expand the dropping portion by the roller in the tire circumferential direction, so that the rigidity of the side portion is high. The work of assembling the tire on the rim can be performed easily and safely, and such a tire assembling work can be performed by one person.

  In the tire assembly aid according to the present invention, the height of the gap is preferably larger than the height of the flange, and the width of the gap is preferably larger than the width of the flange. Thereby, mutual interference with a tire assembly auxiliary tool and a flange can be avoided. It is preferable that the height and width of the gap be adjustable. This makes it possible to widely apply to rims having different sizes. It is preferable to provide a coating layer on at least a part of the surfaces of the fixing part, the pressing part, the extension part and the tightening part. Thereby, damage to a wheel or a pneumatic tire can be prevented. The maximum dimension from the end face of the fixed part to the pressing surface of the pressing part measured along the axial direction of the fastening screw is preferably 30 mm or less. Thereby, a tire assembly auxiliary tool can be easily attached to the bead seat portion of the rim.

The pressing portion needs to be provided with a tire bead portion side arm extending in the wheel axial direction and a tire side portion side arm extending in the wheel radial direction. Here, the length of the tire bead side arm is 30 mm to 60 mm, and the length of the tire side arm is 80 mm to 150 mm . The inclination angle of the pressing surface of the tire bead portion side arm with respect to the axial direction of the tightening screw is 90 ° to 120 °, and the inclination angle of the pressing surface of the tire side portion side arm with respect to the axial direction of the tightening screw is 20 ° to 50 ° . Furthermore, the maximum width of the tire side portion side arm is preferably 20 mm to 50 mm. Thereby, a tire assembly operation can be performed smoothly.

  Hereinafter, the configuration of the present invention will be described in detail with reference to the accompanying drawings. FIG.1 and FIG.2 shows the tire assembly assistance tool which consists of embodiment of this invention.

  As shown in FIG. 1, the tire assembly aid 10 of the present embodiment is a tire assembly aid used when the pneumatic tire T is assembled to the rim R of the wheel W. The tire assembly assisting tool 10 includes a fixing portion 1 fixed to the bead seat portion Rs of the rim R, and a side portion Ts of the pneumatic tire T extending outward from the fixing portion 1 in the wheel radial direction. The fixing portion is fixed by a pressing portion 2 that is pressed from the side, an extension portion 3 that extends from the pressing portion 2 to the back side of the bead sheet portion Rs, and a screw 32 that is screwed into a screw hole 31 that passes through the extension portion 3. The fastening portion 4 is configured to be capable of moving forward and backward toward 1, and a gap 5 for accommodating the flange Rf of the rim R is provided between the fixed portion 1 and the extension portion 3. Reference numeral 33 denotes a lever for operating the fastening screw 32.

  A tire bead portion side arm 21 extending in the wheel axial direction and a tire side portion side arm 22 extending in the wheel radial direction are formed in the pressing portion 2, and the pressing surface 21a of the tire bead side arm 21 and the tire side portion side are formed. The pressing surface 22a of the arm 22 intersects each other.

  The tire assembly aid 10 configured as described above accommodates the flange Rf of the rim R in the gap 5 with the bead seat portion Rs sandwiched between the fixing portion 1 and the tightening portion 4 and tightens it. Based on the tightening force of the screw 32, the rim R is firmly fixed to the bead sheet portion Rs. Moreover, since the inner surface of the gap 5 is in contact with the flange Rf and the pressing portion 2 is supported by the flange Rf, the tire assembly assisting tool 10 has a structure that is difficult to come off from the rim R.

  3 and 4 show a tire assembling method using the tire assembling aid according to the embodiment of the present invention. 3 and 4 show a tire assembling method using a tire changer, only the roller for dropping the bead portion is depicted, and other configurations of the tire changer are omitted.

  As shown in FIGS. 3 and 4, after one bead portion Tb of the pneumatic tire T is fitted into the rim R of the wheel W, the pneumatic tire T is rotated around its axis while the other bead portion Tb is rotated. The part is dropped inside the rim flange Rf by the roller P, and the tire assembly assisting tool 10 is attached to the bead seat portion Rs of the rim R at that portion. In the tire assembly work, at least one tire assembly assisting tool 10 is used, but it is preferable to use a plurality of tire assembly assisting tools 10. FIG. 4 depicts a state in which three tire assembly aids 10 are sequentially mounted on the circumference of the rim R.

  In this way, by extending the dropping portion by the roller P in the tire circumferential direction in a state where the side portion Ts of the pneumatic tire T is pressed by at least one tire assembly assisting tool 10, the other bead portion Tb is entirely expanded. The rim R is fitted over the circumference. Thereby, the operation | work which attaches the pneumatic tire T with high rigidity of the side part Ts to the rim | limb R can be performed easily and safely. In addition, since the tire assembly assisting tool 10 can be attached by one person, the tire assembly operation can be performed by one person.

  The tire assembling method described above is particularly effective when assembling a rim of an ultra flat tire or a side reinforcing run flat tire. The ultra flat tire is suitable when a tire having a flatness ratio of 25% to 50% and an inner diameter of 26 inches to 32 inches is assembled with a rim.

  5 to 12 show details of the tire assembly aid according to the present invention. As shown in FIG. 5, the height A of the gap 5 is larger than the height of the flange Rf, and the width B of the gap 5 is larger than the width of the flange Rf. In other words, the gap 5 accommodates the entire flange Rf. In particular, the height A of the gap 5 is preferably 15 mm or more and 20 mm or less. Thereby, the mutual interference with the tire assembly aid 10 and the flange Rf can be avoided. If the height A and width B of the gap 5 are too small, the flange Rf may be damaged.

  The tire assembly assisting tool 10 can be configured such that the height A and the width B of the gap 5 are adjustable. For example, the height A of the air gap 5 can be adjusted by configuring the fixed portion 1 from a laminated body including a plurality of magnet plates and arbitrarily changing the number of laminated layers. Moreover, the width B of the space | gap 5 can be adjusted by comprising the tire bead part side arm 21 of the press part 2 so that expansion-contraction is possible by a slide mechanism. This makes it possible to apply the common tire assembly aid 10 to rims having different sizes.

  Although the constituent material of the tire assembly assisting tool 10 is not particularly limited, it can be composed of metal or resin. However, when the tire assembly aid 10 is made of a highly rigid material, the wheel W or the pneumatic tire T may be damaged. Therefore, as shown in FIGS. 6 and 7, a coating layer 6 may be provided on part or all of the surfaces of the fixing portion 1, the pressing portion 2, the extension portion 3, and the tightening portion 4. As a constituent material of the covering layer 6, rubber or resin can be used. In some cases, the covering layer 6 may be formed by winding a fabric. Thereby, damage to wheel W or pneumatic tire T can be prevented.

  As shown in FIG. 8, the maximum dimension C from the end face of the fixing part 1 to the pressing surface 22a of the pressing part 2 measured along the axial direction of the fastening screw 32 is set to 30 mm or less, more preferably 20 mm or less. Has been. Thereby, the tire assembly auxiliary tool 10 can be easily attached to the bead seat portion Rs of the rim R. When the maximum dimension C exceeds 30 mm, it is difficult to mount the tire assembly assisting tool 10. In addition, although the maximum dimension C is so preferable that it is short, it cannot be overemphasized that it is set larger than the above-mentioned space | gap height A. FIG.

  The pressing portion 2 includes a tire bead portion side arm 21 extending in the wheel axial direction and a tire side portion side arm 22 extending in the wheel radial direction. As shown in FIG. 9, the length D of the tire bead side arm 21 is provided. Is set to 30 mm to 60 mm, more preferably 40 mm to 50 mm, and the length E of the tire side arm 22 is set to 80 mm to 150 mm, more preferably 100 mm to 120 mm. If the length D of the tire bead side arm 21 is less than 30 mm, it is difficult to attach the fixing portion 1 to the bead seat portion Rb. This makes the tire assembly work difficult. Further, if the length E of the tire side arm 22 is less than 80 mm, the pressing of the tire side portion Tb becomes insufficient, and conversely if it exceeds 150 mm, no further effect is obtained and it is useless.

  As shown in FIG. 10, the inclination angle α of the pressing surface 21a of the tire bead portion side arm 21 with respect to the axial direction of the tightening screw 32 is set to 90 ° to 120 °, more preferably 100 ° to 110 °. The inclination angle β of the pressing surface 22a of the tire side portion side arm 22 with respect to the axial direction of the screw 32 is set to 20 ° to 50 °, more preferably 30 ° to 40 °. By setting the angles α and β within the above ranges, the tire assembling work can be performed smoothly. The pressing surface 21a of the tire bead portion side arm 21 and the pressing surface 22a of the tire side portion side arm 22 are preferably extended in a substantially flat shape as shown in the figure, but the curved surface is extended along each extending direction. It may be formed.

  As shown in FIG.11 and FIG.12, the maximum width F of the tire side part side arm 22 is set to 20 mm-50 mm, More preferably, it is set to 30 mm-35 mm. If the maximum width F of the tire side arm 22 is less than 20 mm, the stress concentration on the bead portion Tb of the pneumatic tire T at the time of assembling the rim becomes excessive, and conversely if it exceeds 50 mm, the curvature of the bead portion Tb is exceeded. Therefore, it becomes difficult to insert the tire assembly assisting tool 10 between the rim R and the bead portion Tb.

  When assembling a pneumatic tire having a tire size of 305 / 30R26 to a wheel having a rim size of 26 × 12J, various assembling methods were implemented.

Conventional example 1:
A tire lever was used as a tire assembly aid. Then, after fixing the wheel to the tire changer and fitting one bead portion of the pneumatic tire into the rim of the wheel, a part of the other bead portion of the pneumatic tire is dropped into the inside of the rim flange by a roller. Inserted a tire lever between the rim flange and the bead portion at a plurality of locations on the tire circumference, and extended the dropping portion by the roller in the tire circumferential direction while preventing the bead portion from returning.

Conventional example 2:
As a tire assembling aid, a tire assembling aid that has a bifurcated structure and elastically engages with the rim flange was used. Then, after fixing the wheel to the tire changer and fitting one bead portion of the pneumatic tire into the rim of the wheel, a part of the other bead portion of the pneumatic tire is dropped inside the rim flange by a roller. A tire assembly aid is mounted between the rim flange and the bead portion at the part, and the dropping part by the roller is expanded in the tire circumferential direction in a state where the side part of the pneumatic tire is pressed by the tire assembly aid. .

Example 1:
As a tire assembly aid, a fixed portion fixed to the bead seat portion of the rim, a pressing portion extending from the fixed portion toward the outer side in the wheel radial direction and pressing the side portion of the pneumatic tire from the outside, An extension portion extending from the pressing portion to the back side of the bead sheet portion, and a tightening portion configured to be movable forward and backward toward the fixing portion by a tightening screw screwed into a screw hole penetrating the extension portion. A tire assembling aid provided with a gap for accommodating the flange of the rim between the fixed part and the extension part was used. Then, after fixing the wheel to the tire changer and fitting one bead portion of the pneumatic tire into the rim of the wheel, a part of the other bead portion of the pneumatic tire is dropped inside the rim flange by a roller. A tire assembly aid is mounted between the rim flange and the bead portion at the part, and the dropping part by the roller is expanded in the tire circumferential direction in a state where the side part of the pneumatic tire is pressed by the tire assembly aid. .

  As a result, in Example 1, one worker was able to complete the tire assembly work in about 10 minutes using the five tire assembly assisting tools. On the other hand, in Conventional Example 1, six workers could complete the tire assembling work in about 30 minutes. Moreover, in the prior art example 2, since the tire assembly auxiliary tool is detached due to the reaction force of the bead portion, the tire assembly operation cannot be completed.

It is a side view which shows the tire assembly assistance tool which consists of embodiment of this invention. It is a front view which shows the tire assembly assistance tool which consists of embodiment of this invention. It is sectional drawing of the pneumatic tire and wheel for demonstrating the tire assembly method using the tire assembly auxiliary tool which consists of embodiment of this invention. It is a top view of the pneumatic tire and wheel for demonstrating the tire assembly method using the tire assembly auxiliary tool which consists of embodiment of this invention. It is a side view which shows the detail of the tire assembly assistance tool which consists of embodiment of this invention. It is a side view which shows the detail of the tire assembly assistance tool which consists of embodiment of this invention. It is a side view which shows the detail of the tire assembly assistance tool which consists of embodiment of this invention. It is a side view which shows the detail of the tire assembly assistance tool which consists of embodiment of this invention. It is a side view which shows the detail of the tire assembly assistance tool which consists of embodiment of this invention. It is a side view which shows the detail of the tire assembly assistance tool which consists of embodiment of this invention. It is a front view which shows the detail of the tire assembly assistance tool which consists of embodiment of this invention. It is a front view which shows the detail of the tire assembly assistance tool which consists of embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fixing part 2 Pressing part 3 Extension part 4 Clamping part 5 Cavity part 6 Covering layer 10 Tire assembly auxiliary tool 21 Tire bead part side arm 21a Pressing surface 22 Tire side part side arm 22a Pressing surface 31 Screw hole 32 Tightening screw 33 Lever T Pneumatic tire Tb Bead part Ts Side part W Wheel R Rim Rs Bead seat part Rf Flange

Claims (9)

In a tire assembly aid used when assembling a pneumatic tire to a rim of a wheel, a fixing portion fixed to the bead seat portion of the rim, and extending from the fixing portion toward the outer side in the wheel radial direction A pressing portion that presses the side portion of the pneumatic tire from the outside, an extension portion that extends from the pressing portion to the back side of the bead sheet portion, and a tightening screw that is screwed into a screw hole that passes through the extension portion wherein toward the fixed part and a movably configured tightening portion, the fixed portion and the voids for accommodating the flange of the rim between the extensions provided Rutotomoni, wheel shaft to the pressing portion by A tire bead side arm extending in the direction and a tire side side arm extending in the wheel radial direction, the tire bead side arm having a length of 30 mm to 60 mm, and the tire side arm The tire bead portion side arm with respect to the axial direction of the tightening screw has a length of 80 mm to 150 mm, and the pressing surface of the tire bead portion side arm and the pressing surface of the tire side portion side arm intersect each other. An inclination angle of the pressing surface of the tire is 90 ° to 120 °, and an inclination angle of the pressing surface of the tire side portion side arm with respect to the axial direction of the tightening screw is 20 ° to 50 °. Auxiliary tool.   The tire assembly aid according to claim 1, wherein a height of the gap is larger than a height of the flange, and a width of the gap is larger than a width of the flange.   The tire assembly aid according to claim 1 or 2, wherein the height and width of the gap are adjustable.   The tire assembly aid according to any one of claims 1 to 3, wherein a covering layer is provided on at least a part of the surfaces of the fixing portion, the pressing portion, the extension portion, and the tightening portion.   5. The maximum dimension from the end surface of the fixed portion to the pressing surface of the pressing portion measured along the axial direction of the fastening screw is set to 30 mm or less. Tire assembly aids. The tire assembly aid according to any one of claims 1 to 5, wherein the tire bead side arm has a length of 40 mm to 50 mm , and the tire side arm has a length of 100 mm to 120 mm . And 100 ° to 110 ° the inclination angle of the pressing surface of the tire bead portion side arm with respect to the axial direction of the screw the tightening, 30 angle of inclination of the pressing surface of the tire side portion side arm with respect to the axial direction of the screw the tightening The tire assembly aid according to any one of claims 1 to 6, characterized in that the tire assembly angle is set to ° to 40 ° .   A tire bead portion side arm extending in a wheel axial direction and a tire side portion side arm extending in a wheel radial direction are provided in the pressing portion, and a maximum width of the tire side portion side arm is set to 20 mm to 50 mm. Item 8. A tire assembly aid according to any one of Items 1 to 7.   A method for assembling a pneumatic tire to a rim of a wheel using the tire assembly aid according to any one of claims 1 to 8, wherein one bead portion of the pneumatic tire is fitted into a rim of the wheel. Thereafter, a part of the other bead portion of the pneumatic tire is dropped into the inside of the rim flange by a roller, and the tire assembly aid is attached to the bead seat portion of the rim at the portion, and the tire assembly assist A tire assembling method, wherein a dropping portion by the roller is expanded in a tire circumferential direction in a state where a side portion of the pneumatic tire is pressed by a tool.

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