JPH068008U - Pneumatic tires for passenger cars - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a pneumatic tire for a passenger vehicle, which is provided with a rim protector on a side profile to improve workability and safety during rim assembly. [Structure] A rim protector 5 protruding in a tire width direction is provided on a side profile of a tire 3 along a tire circumferential direction, and at least one notch 6 into which a tire lever can be inserted is provided in the rim protector 5.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pneumatic tire for a passenger vehicle equipped with a rim protector, and particularly for a pneumatic tire for a passenger vehicle, which is improved in workability and safety when mounting / removing to / from a rim (hereinafter referred to as a rim assembly) Regarding tires.

[0002]

[Prior art]

 In general, flat pneumatic tires for passenger cars have a drawback in that the rim flange is likely to be damaged by contact with a curb or the like during traveling because the tire cross-section height is low. For this reason, in recent years, many tires have a side profile provided with a rim protector projecting in the tire width direction along the tire circumferential direction in order to protect the rim from curbs and the like.

However, in the tire having the side profile as described above, the rigidity of the sidewall portion is extremely high due to the rubber thickness of the protruding rim protector, and the rim protector becomes an obstacle, and is used as a rim assembly tool. Since it is difficult to insert the tire lever to be used, the workability when assembling the tire on the rim is poor, and the large reaction force on the tire lever impairs the safety of sliding the hand.

[0004]

[Problems to be solved by the device]

 An object of the present invention is to provide a pneumatic tire for a passenger vehicle, which is improved in workability and safety in assembling a rim when a rim protector is provided on a side profile.

[0005]

[Means for Solving the Problems]

 The pneumatic tire for passenger cars according to the present invention is a pneumatic tire for passenger cars in which a side profile is provided with a rim protector extending in the tire circumferential direction, wherein the rim protector has at least a cutout portion into which a tire lever can be inserted. It is characterized in that it is provided above the location.

Since at least one cutout portion into which the tire lever can be inserted is provided in the rim protector in this manner, the tire lever is inserted into the cutout portion when the tire is attached to or removed from the rim. Can be easily inserted and the inserted tire lever is fixed to the notch to prevent it from slipping, improving workability when assembling the rim. In addition, the notch has lower rigidity and lower height than other parts of the rim protector, so the reaction force applied to the tire lever during rim assembly is reduced, so Improves safety when sliding.

Hereinafter, the configuration of the present invention will be described in detail with reference to the accompanying drawings. In the figure, 1 is a wheel, 2 is a rim flange of the wheel 1, 3 is a pneumatic tire mounted on the wheel 1, and 4 is a bead portion of the tire 3. The side profile of the pneumatic tire 3 is provided with a rim protector 5 protruding in the tire width direction along the tire circumferential direction. Since the rim protector 5 is provided for the purpose of protecting the rim of the wheel 1, its cross-sectional shape is not particularly limited and can be various shapes such as a circular shape and a polygonal shape.

The rim protector 5 is provided with one or more notched portions 6 (three in the figure) into which at least a tire lever (rim assembly tool) can be inserted. The notch shape of the notch portion 6 is not particularly limited, and it may be a curve notch in the tire circumferential direction, or may be a notch at a right angle to have a profile when a normal rim protector is not added. it can. The width of the notch 6 may be any width as long as the tire lever can be inserted therein, and is preferably 25 to 40 mm. Also, at least one notch 6 is required, but considering the operability when using multiple tire levers when assembling the rim and the effect on tire uniformity, the notch 6 should be placed evenly around the tire circumference at 3 to 6 places. It is preferable to provide it.

When assembling the pneumatic tire 3 in which the notch portion 6 is provided in the rim protector 5 as described above, the tire lever is easily inserted from the notch portion 5 between the rim flange 2 and the bead portion 4. Further, since the position of the inserted tire lever is fixed to the notch 5, the workability at the time of assembling the rim can be greatly improved. In addition, in the notch 5, the rubber volume is reduced by the amount of the notch and the rigidity is low, and the height is low, so when this portion is used as a cushion when applying force to the tire lever. Since the generated reaction force is reduced, it is possible to improve the safety when the hand is slipped.

The present invention is preferably applied to a flat pneumatic tire having a flatness of 55% or less. Such a flat pneumatic tire has an extremely low tire cross-section height.By installing the above-mentioned rim protector, it is possible to effectively prevent damage to the rim flange during traveling, and also work during rim assembly. Safety and security can be improved.

[0011]

【Example】

 The tire size is 215 / 40ZR17, the tire of the present invention in which three notches with a width of 35 mm are evenly arranged at three locations on the rim protector as shown in FIGS. Tires were manufactured respectively.

[0012] These two types of tires are assembled into rims with a rim size of 17 × 7JJ using a changer (manufactured by HOFMANN: MOUNTY 31), and work efficiency and workability at the time of assembly and removal are evaluated. did. The evaluation result is shown by an index with the conventional tire being 100. In Table 1, the work efficiency is calculated by the time required for the rim assembly, and the larger this index value, the better the work efficiency. The workability is evaluated by the ease of rim assembly and the force required during rim assembly based on the feeling of the operator. The larger the index value, the better the workability.

(Table 1) As is clear from Table 1, the workability of the tire of the present invention at the time of assembling the rim is greatly improved as compared with the conventional tire in which the rim protector is provided all around the tire.

[0014]

[Effect of device]

 As described above, according to the present invention, in a pneumatic tire for a passenger vehicle in which a side profile is provided with a rim protector extending in the tire circumferential direction, the rim protector is provided with a cutout portion into which at least a tire lever can be inserted. Since the tire lever can be easily inserted and the tire lever is fixed to the notch, it is possible to improve workability when assembling the rim. Since the reaction force applied to the tire lever is reduced, it is possible to improve the safety when sliding your hand.

[Brief description of drawings]

FIG. 1 is a side view showing a state in which a pneumatic tire for passenger cars according to an embodiment of the present invention is assembled with a rim.

FIG. 2 is a perspective view showing a pneumatic tire for passenger cars according to an embodiment of the present invention.

[Explanation of sign]

 1 wheel 2 rim flange 3 pneumatic tire 4 bead 5 rim protector 6 notch

Claims (1)

[Scope of utility model registration request] 1. A pneumatic tire for a passenger vehicle having a side profile provided with a rim protector extending in the tire circumferential direction, wherein the rim protector is provided with at least one cutout portion into which at least a tire lever can be inserted. Included tires.