TWI602715B - Stroller and baby carriage for strollers - Google Patents

Description

Baby car wheel and stroller Field of invention

The invention relates to a wheel for a baby carriage and a baby carriage.

For example, as disclosed in JP 2002-220060 A, a stroller with wheels is widely available for utilization. In general, the wheel of a stroller is formed by embedding a solid tire formed of resin, rubber, foamed plastic or the like on a rim. As is generally seen in the wheel for a baby carriage, as shown in FIG. 5, the rim 90 has a pair of support wall portions 91 that protrude outward in the radial direction and extend in the circumferential direction at positions outside the width direction. On the other hand, the tire 95 has the engagement convex portion 96 disposed between the pair of support wall portions 91 and the tire outer portion 97 located outward in the radial direction of the engagement convex portion. The engagement convex portion 96 of the tire 95 is disposed between one of the pair of rims 90 and the support wall portion 91, and the tire 95 is attached to the rim 90. Further, the tire outer portion 97 of the tire 95 is supported by the pair of support wall portions 91, and exhibits impact absorption and vibration absorption.

As described above, the outer portion of the tire is expected to have the shock absorbing property and the vibration absorbing property of the wheel. However, the engaging convex portion of the tire is located in the space formed by the support wall portion of the rim, and does not walk in the stroller. Load between the ground and the rim. In other words, the engagement convex portion of the tire does not exhibit impact absorption and vibration absorption, and is used only as an engagement portion that engages with the rim. Even in this case, the engaging portion for the tire is formed in the same manner as the outer portion of the tire, and the material having a large specific gravity is formed thickly. As a result, conventional wheels cause defects such as weighting of the stroller or an increase in manufacturing cost. Further, in this type of wheel, since the tire has a thick portion, the molding time becomes long, and there are defects such as a decrease in dimensional precision.

Invention

On the other hand, the inventors of the present case have repeatedly made efforts to study the results and developed wheels that are different from the conventional ones. In this wheel, the tire is mounted on the rim by actively utilizing the contraction of the base of the tire constituting the ground contact surface of the tire. Therefore, unlike the conventional one, it is possible to eliminate the necessity of providing a thick portion to the tire, and the thick portion is mainly used as an engaging portion for mounting the tire to the rim. The present invention has been based on the findings of the inventors of the present invention, and therefore, it is an object of the present invention to provide a wheel and a stroller having the same that can cope with various conventional drawbacks caused by the fact that the tire has a thick portion.

The wheel of the present invention is a wheel for a baby carriage rotatably held around a rotation axis, and includes: a rim having an annular base extending in a circumferential direction centered on the rotation axis; and a The annular inner ribs are oriented in a radial direction parallel to the rotation axis from a position on the inner base portion to the inner end portion of the base portion to a radial direction centered on the rotation axis The outer side protrudes and extends in the circumferential direction; and the tire is mounted on the rim from the outer side of the radial direction; The tire includes an annular tire base portion supported by at least the pair of inner ribs, and is curved convexly outward in the radial direction in a cross section parallel to both the axial direction and the radial direction. And extending in the circumferential direction; and the inner protruding portion protrudes from the tire base portion inward in the radial direction, and is engageable with the inner protruding strip; and the outer surface of the tire base portion in the radial direction forms a grounding surface.

In the wheel of the present invention, the rim further includes: a pair of annular outer ribs in the axial direction from a position on the base of the outer sides of the pair of annular inner ribs The radial direction protrudes outward and extends in the circumferential direction; the protruding height of the inner rib from the base portion in the radial direction outward is outward from the base portion along the radial direction from the outer rib The height of the protrusion is high.

In the wheel of the present invention, the outer rib may be disposed at a position that is an end portion of the base portion in the axial direction.

In the wheel of the present invention, the tire base portion of the tire may be apart from the base portion of the rim between the outer ridge and the inner rib in the axial direction.

In the wheel of the present invention, the inner protruding portion of the tire may be located between any two of the ribs adjacent to the axial direction.

In the wheel of the present invention, the inner protruding portion of the tire may be located between the pair of inner ribs; in the axial direction Between the pair of inner ribs, the inner protruding portion of the tire is away from the base portion of the rim.

In the wheel of the present invention, the aforementioned tire may be further away from the aforementioned base of the rim.

In the wheel of the present invention, the protruding height of the inner protruding portion from the tire base portion may be lower than the thickness of the tire base portion.

In the wheel of the present invention, the tire may be subjected to the tensile stress in the circumferential direction in the entire axial direction in a state in which the tire is mounted on the rim.

In the wheel of the present invention, in a state in which the tire is mounted on the rim, both end portions of the tire base portion in the axial direction are located at an inner end of the radial direction of the inner protruding portion. It is more inward than the aforementioned radial direction.

In the wheel of the present invention, the end portion of the tire base portion may be located outside the both end portions of the base portion in the axial direction.

In the wheel of the present invention, the base portion of the rim may extend in parallel with the axial direction.

A stroller of the present invention comprises any of the above-described wheels of the present invention.

According to the present invention, various defects caused by the fact that the tire has a thick portion can be relieved.

10‧‧‧ baby carriage

11‧‧‧ Baby stroller body

12‧‧‧ Front foot

13‧‧‧front wheel holding unit

14‧‧‧ hind feet

15‧‧‧ Rear wheel holding unit

20‧‧‧ Wheels

30, 90‧ ‧ rims

31‧‧‧ spokes

31a‧‧‧through hole

32‧‧‧ rim

35‧‧‧ base

35a‧‧‧ the end of the base

37‧‧‧Outer ribs

39‧‧‧Inside ribs

40, 95‧‧‧ tires

41‧‧‧ ground plane

45‧‧‧ Tire base

45a‧‧‧End of the base of the tire

49‧‧‧Inside Prominence

49a‧‧‧Inside of the inner radius of the inner protruding part

91‧‧‧Support wall

96‧‧‧Clamping convex parts

97‧‧‧ outside the tires

Da‧‧‧ axis direction (width direction)

Dc‧‧‧ circumferential direction

Dr‧‧‧ Radial direction

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view for explaining an embodiment of the present invention; A perspective view of a stroller with wheels.

Fig. 2 is a side view showing the wheel for a baby carriage.

Figure 3 is a cross-sectional view taken along line III-III of Figure 2;

Fig. 4 is a cross-sectional view showing the tire mounted in front of the rim in the same cross section as Fig. 3;

Fig. 5 is a cross-sectional view showing a conventional wheel for a baby carriage in the same cross section as Fig. 3.

Form for implementing the invention

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the stroller 10 has a stroller body 11 having a front leg 12 and a rear leg 14 , a front wheel holding unit 13 disposed at a lower end of the front leg 12 of the stroller body 11 , and a rear wheel holding unit 15 disposed on the stroller The body 11 is followed by the lower end of the foot 14. For example, the front wheel holding unit 13 may be configured to rotatably and rotatably support the casters of the wheel 20. Further, the rear wheel holding unit 15 may be configured as a holding mechanism that rotatably and non-rotatably supports the wheel 20. The front wheel holding unit 13 and the rear wheel holding unit 15 may be configured to hold wheels that are different from each other, and in the following, the wheels 20 having the same configuration are described.

As shown in FIG. 1, the wheel 20 has a rim 30 and a tire 40 mounted on the rim 30. The rim 30 is rotatably held by the corresponding front wheel holding unit 13 or the rear wheel holding unit 15. On the other hand, the tire 40 is embedded in the rim 30 and fixed to the rim 30.

The rim 30 has a rim portion 32 that extends annularly to the wheel 20 The rotation axis is a central circumferential direction dc; and the spokes 31 extend in a radial direction da (hereinafter simply referred to as "radial direction") centering on the rotation axis of the wheel 20, in other words, the plurality of spokes 31 are in the wheel 20 The axis of rotation extends radially out of the center. A plurality of spokes 31 meet at the inner end in the radial direction dr. A through hole 31a for passing through an axle not shown in the figure is formed at the junction of the spokes 31. For example, the rim 30 can be integrally formed by injection molding a resin material.

Next, the rim portion 32 of the rim 30 will be further described in detail with reference mainly to the cross-sectional view shown in FIG. Moreover, the cross section shown in FIG. 3 is a cross section parallel to both the radial direction da and the axial direction (width direction) da parallel to the rotation axis of the wheel 20.

The rim portion 32 of the rim 30 has a base portion 35, an outer rib 37 and an inner rib 39 projecting from the base portion 35 to the outside of the radial direction dr (on one side away from the rotation axis). The base portion 35 extends in the circumferential direction dc to form an annular shape, and is formed in a plate shape in a cross section along the axial direction da. In particular, in the illustrated example, the base portion 35 extends in parallel with the axial direction da in the cross section of Fig. 3, and is formed in a flat shape. Outer ribs 37 are provided at positions at both ends of the axial direction da of the base portion 35. Further, in the axial direction da, a pair of inner ribs 39 are provided from the base portion 35 between the pair of outer ribs 37. That is, the pair of inner ribs 39 are located at positions inward from the both ends in the axial direction da of the base portion 35. The pair of inner ribs 39 are disposed apart from each other in the axial direction da on the base portion 35.

The outer ridges 37 and the inner ribs 39 are provided on a surface other than the radial direction dr of the base portion 35, and protrude outward in the radial direction dr. Particularly in the illustrated example, the outer rib 37 and the inner rib 39 are from the base 35 and the radial direction Dr extends out in parallel. The protruding height from the base portion 35 in the radial direction of the dr is the same between the pair of outer ribs 37. Further, the protruding height from the base portion 35 to the outside in the radial direction dr is identical to each other between the pair of inner ribs 39. Further, the protruding height of the inner rib 39 from the base portion 35 in the radial direction dr is higher than the protruding height of the outer rib 37 from the base portion 35 in the radial direction dr to the outside. The outer rib 37 and the inner rib 39 extend in the circumferential direction dc, respectively, and are formed in an annular shape.

Next, the tire 40 will be described. As shown in FIGS. 2 and 3, the tire 40 is attached to the rim 30 from the outside in the radial direction dr. As shown in FIG. 3, the tire 40 has a plate-shaped tire base portion 45 supported by a pair of outer ribs 37 and a pair of inner ribs 39, and an inner protruding portion 49 provided on the tire base portion 45. The tire base portion 45 is in a state in which the tire 40 is mounted on the rim 30, and the cross section shown in FIG. 3 (parallel to both the axial direction da and the radial direction dr) has a central portion of the axial direction da which is outside the radial direction dr. The protrusion is formed in a plate shape that is convexly curved outward in the radial direction dr. The tire base 45 extends in the circumferential direction dc to form an annular shape. The outer surface of the tire base 45 in the radial direction dr forms a ground contact surface 41.

The inner protruding portion 49 is provided on the inner surface of the tire base portion 45 in the radial direction dr. The inner protruding portion 49 is disposed between the pair of inner ribs 39 of the rim 30 in a state in which the tire 40 is mounted on the rim 30. In the example shown in the figure, the inner protruding portion 49 extends in the circumferential direction dc and is formed in an annular shape. Further, in the cross section shown in Fig. 3, the inner protruding portion 49 has a curved outer contour. In particular, in the cross section shown in Fig. 3, the inner protruding portion 49 is formed in a shape corresponding to a part of a circle or an ellipse. In the illustrated example, the inner projection 49 is from the tire base. The protruding height of the portion 45 along the radial direction dr is lower than the thick portion of the tire base 45. Further, between one of the axial directions da and the inner ribs 39, the inner protruding portion 49 of the tire 40 is separated from the base portion 35 of the rim 30.

The tire 40 is formed of a stretchable material such as resin, rubber, or foamed plastic. The tire 40 is designed to have a specific strength or durability corresponding to the design of the stroller. As a typical material for producing the tire 40, for example, there is an EVA bridging foam. The EVA bridging foam is an ethylene-vinyl acetate copolymer and is a thermoplastic foam obtained by polymerizing an olefin. The EVA bridging foam has suitable strength, flexibility, and elasticity, and is suitable for use as a material for the tire 40 for a baby carriage. Further, by adding rubber to the EVA bridging foam, the elasticity or heat resistance of the tire 40 can be improved, and the tire 40 can be colored by adding a pigment.

In the wheel 20 of the present embodiment, the tire 40 is placed on the rim portion 32 of the rim 30 by elastically deforming the tire 40 so as to extend along the circumferential direction of the circumferential direction dr. The tire 40 can be mounted on the rim portion 32 of the rim 30 from the outside of the radial direction dr. FIG. 4 shows a state in which the tire 40 is assembled before the rim 30. The cross section shown in Fig. 4 shows the same cross section as Fig. 3, and shows a state in which the formed tire 40 is not subjected to an external force. In the example shown in Fig. 4, the tire base portion 45 of the tire 40 extends in the axial direction da, and is formed in a flat shape without being bent. Further, the tire base portion 45 of the tire 40 has a constant thickness along the axial direction da except for both end portions in the axial direction da.

In the wheel 20 shown in Fig. 3, the tire 40 is in a state of being stretched in the circumferential direction dc in the entire region along the axial direction da. In other words, the tire 40 appears in the entire area along the axial direction da: in the circumferential direction dc The state of being subjected to tensile stress. Therefore, both end portions of the full width of the tire 40 are located at the innermost position in the radial direction dr, and are subjected to tensile stress. In particular, in the illustrated example, in a state where the tire 40 is mounted on the rim 30, both end portions 45a of the tire base portion 45 in the axial direction da are compared with the inner end portion 49a of the radial direction dr of the inner protruding portion 49. , located in the radial direction to come inside. Therefore, unless a large external force is applied, the end portion 45a of the tire base portion 45 subjected to the tensile stress is stretched against the tensile stress, whereby the tire 40 can be effectively prevented from being curled from the end portion 45a and coming off from the rim 30.

As described above, the tire base portion 45 of the tire 40 mounted on the rim 30 extends along a path formed by the outer ribs 37 and the inner ribs 39, and maintains a curved shape as shown in the figure, wherein the outer side The ridges 37 and the inner ribs 39 project outward from the base portion 35 of the rim 30 in the radial direction dr. Therefore, as shown in FIG. 3, between the outer side ribs 37 and the inner side ribs 39 in the axial direction da, the tire base portion 45 of the tire 40 is detached from the base portion 35 of the rim 30 in the radial direction dr. Further, in the illustrated example, the inner protruding portion 49 of the tire 40 is separated from the base portion 35 of the rim 30 between one of the axial direction da and the inner protruding rib 39. As a result, in the illustrated wheel 20, the tire 40 is detached from the base 35 of the rim 30.

Next, the action of this embodiment will be described.

In the above-described embodiment, the rim 30 has a base portion 35 and a pair of inner ribs 39, and the tire 40 has a tire base portion 45 and an inner protruding portion 49, and the tire 40 is out of the radial direction dr due to its elastic restoring force. Installed on the rim 30. Therefore, the tire base portion 45 of the tire 40 is supported by the inner rib 39 of the rim 30, and in the cross section along the axial direction da, a plate shape which is convexly curved outward in the radial direction dr, and Square protrusion 49 can be combined with inner rib 39 snaps.

According to the wheel 20 of the present embodiment, in addition to the engagement of the inner protruding portion 49 of the tire 40 with the rim 30, the offset of the rim 30 from the tire 40 in the axial direction da can be restricted, and also by the tire base 45. The contraction 40, the tire 40 is engaged with the rim 30. Therefore, it is not necessary to have a thick portion for engagement (the engaging convex portion 96 of Fig. 5) as in the conventional wheel. In the present embodiment, the manufacturing cost of the wheel 20 can be directly reduced by eliminating a thick portion that does not exhibit the original purpose of the tire, that is, shock absorbing or vibration absorbing. Further, since the tire 40 is a material having a large specific gravity among the materials for the baby carriage, the wheel 20 and the stroller 10 can be lightened by eliminating a thick portion.

Further, since the tire 40 of the wheel 20 is composed of a curved belt-shaped tire base portion 45 and an inner protruding portion 49 projecting from the tire base portion 45, and has no thick portion, the molding time of the tire 40 can be shortened. Moreover, the dimensional precision of the tire 40 can be improved. In particular, when the tire 40 is molded using a foam material such as a general foam rubber, the heating time for the foam molding can be greatly shortened.

Further, in addition to the dimensional precision of the tire 40, the tire 40 is mounted on the rim 30 by the contraction of the curved base portion 45 of the curved plate shape forming the ground surface 41, so that the tire 40 can be effectively prevented from the rim The suspension is 30, that is, the gap between the tire 40 and the rim 30 is effectively prevented from being formed. As a result, it is also possible to effectively prevent the tire 40 from coming off the rim 30.

Also, the wear of the tire 40 is most at the position facing the inner rib 39 in the tire base 45. Then, at the position where the wear of the tire base portion 45 at this position is performed, at the position facing the inner rib 39 in the ground plane 41 of the tire 40, A stripe pattern extending in the circumferential direction dc appears. The user of the stroller 10 can judge whether or not the tire 40 is worn by the presence or absence of the stripe pattern, and can replace the wheel 20 at an appropriate timing. That is, the wheel 20 of the present embodiment provides an index of the replacement period of the wheel 20 concerned.

Further, according to the present embodiment, the rim 30 further includes a pair of annular outer ribs 37 in the axial direction da, from the position on the outer base 35 of the pair of inner ribs 39, in the radial direction dr The outer side protrudes and extends in the circumferential direction dc. Then, the protruding height of the inner rib 39 from the base portion 35 in the radial direction dr is higher than the protruding height of the outer rib 37 from the base portion 35 in the radial direction dr to the outside. If the outer ribs 37 are provided in addition to the inner ribs 39, the tire base portion 45 is stably supported at the position facing the inner ribs 39 at the position facing the inner ribs 39, and can be formed outside the radial direction dr. The overall contour of the convex tire base 45 is more stable and maintained.

Further, according to the present embodiment, the inner protruding portion 49 is disposed in the ridges (the outer ribs 37 and the inner ribs 39) provided on the tire base portion 45 in the axial direction da adjacent to the two ribs Between the pair of inner ribs 39 in the illustrated example. Therefore, the engagement of the inner protruding portion 49 with the pair of ridges can effectively limit the deviation of the rim 30 from the tire 40 in the axial direction da.

Further, according to the present embodiment, between the outer side ridges 37 and the inner side ribs 39 in the axial direction da, the tire base portion 45 of the tire 40 is separated from the base portion 35 of the rim 30. Further, the inner projection 49 of the tire 40 also alienates the base 35 of the rim 30, with the result that, as a whole, the tire 40 is detached from the rim 30 in the radial direction dr. According to the wheel 20, the tire base 45 of the tire 40 The outer rib 37 and the inner rib 39 are bent between the outer ribs 30 of the rim 30, and the tire base portion 45 and the inner protruding portion 49 are bent between the inner ribs 39 of one of the rims 30, and more by the wheel. The inner rib 39 of the ring 30 is curved, and even if the thickness of the tire base 45 is thin, sufficient shock absorption and sufficient vibration absorbability of the wheel 20 can be imparted.

Further, the inner protruding portion 49 operates in conjunction with the contraction force of the tire base portion 45, and the tire 40 can be prevented from deviating from the rim 30 in the axial direction da. Therefore, in the wheel 20 for a stroller, the height of the inner projection 49 does not have to be made high to the contact base 35. Further, the protruding height of the inner protruding portion 49 from the tire base portion 45 is lower than that of the thick portion of the tire base portion 45. As described above, if the amount of protrusion of the inner protruding portion 49 from the tire base portion 45 is made small, the molding time of the tire 40 can be further shortened, and the dimensional precision of the tire 40 can be further improved.

Further, in the present embodiment, the tire 40 is subjected to the tensile stress in the circumferential direction dc in the entire region in the axial direction da in the state of being mounted on the rim 30. According to the wheel 20 as described above, the tire 40 is stabilized in the state in which the rim 30 is mounted. Thereby, the tire 40 can be effectively prevented from falling off from the rim 30.

Further, in the present embodiment, in the state in which the tire 40 is mounted on the rim 30, the end portions 45a of the tire base portion 45 in the axial direction da are smaller than the inner end portions of the inner protruding portion 49 in the radial direction dr. 49a, located in the radial direction dr to come inside. According to the wheel 20 as described above, the both end portions 45a of the axial direction da of the tire 40 can be effectively prevented from being curled from the rim 30, whereby the tire 40 can be stabilized and prevented from falling off from the rim 30.

Further, in the present embodiment, as shown in FIG. 3, the end portion 45a of the tire base portion 45 in the axial direction da is compared with the base portion of the axial direction da. Both end portions 35a of 35 are located outside in the axial direction da. Therefore, the impact from the outside of the axial direction da can also be absorbed to the tire 40. In particular, in the present embodiment, since the tire base portion 45 that supports the outer rib 37 is provided at the end portion 35a of the base portion 35, the positional relationship between the end portion 45a of the tire base portion 45 in the axial direction da and the both end portions 35a of the base portion 35 is obtained. Stability and maintenance.

Further, various modifications can be made to one of the above embodiments. An example of the modification will be described below.

For example, in the above-described embodiment, the outer ridges 37 are provided at positions of both end portions of the base portion 35 in the axial direction da, but the present invention is not limited thereto. The outer ridges 37 may be disposed at positions slightly deviated from the both end portions of the base portion 35 along the axial direction da.

Further, in the above embodiment, the outer ridge 37 and the inner rib 39 are extended from the base portion 35 in parallel with the radial direction dr, but the invention is not limited thereto. One or more of the outer ridges 37 and the inner ribs 39 may be extended from the base portion 35 in the oblique direction with respect to the radial direction dr. Further, in the cross section of FIG. 3, the outer ribs 37 and the inner ribs 39 may not necessarily protrude linearly from the base portion 35, for example, curved.

Further, in the above embodiment, the display example is such that a pair of outer ridges 37 and a pair of inner ridges 39 are provided on the base portion 35 of the rim 30, but the invention is not limited thereto. For example, a ridge protruding from the base portion 35 to the outside of the radial direction dr may be further provided. Further, the ridges to be provided may extend annularly in the circumferential direction dc or intermittently in the circumferential direction dc.

Further, in the above embodiment, the display portion is such that the base portion 35 of the rim 30 extends in parallel with the axial direction da and is formed in a flat shape. However, it is not limited to this. For example, the base 35 can also be curved.

Further, in the above embodiment, the tire base portion 45 of the tire 40 has a thickness of approximately constant. However, the present invention is not limited thereto. For example, the thickness may be changed along the axial direction da.

Further, in the above embodiment, the display example is that the tire 40 is separated from the base portion 35 of the rim 30 in the radial direction dr, but is not limited thereto. For example, the tire 40 is only brought into contact with the base portion 35 of the rim 30 at its both end portions 45a.

Further, in the above embodiment, the display example is such that the inner protruding portion 49 extends annularly in the circumferential direction dc, but is not limited thereto. For example, the inner protruding portions 49 may be intermittently arranged at intervals in the circumferential direction dc.

Further, in the above embodiment, the display example is such that the inner protruding portion 49 extends between the pair of inner ribs 39, but the invention is not limited thereto. For example, the inner protruding portion 49 may be disposed between the two ribs adjacent to each other to be disposed on the tire base portion 45. For example, a pair of inner protruding portions 49 are provided on the tire base portion 45, and an inner protruding portion 49 of one of the pair of inner protruding portions 49 is disposed on the outer side rib 37 and the inner side of one side in the axial direction da Between the ridges 39, the other inner protruding portion 49 is disposed between the outer ribs 37 and the inner ribs 39 located on the other side in the axial direction da.

Further, in the above embodiment, an example of the cross-sectional shape of the inner protruding portion 49 is shown, but the cross-sectional shape of the inner protruding portion 49 may be a triangle or a quadrangle in various shapes.

Furthermore, an example of the stroller 10 to which the tire 40 and the wheel 20 are applied is, for example, the stroller 10 shown in FIG. The stroller 10 shown in Fig. 1 is miniaturized to be foldable in the front-rear direction and the height direction. However, not limited For example, in the stroller disclosed in Japanese Laid-Open Patent Publication No. 2011-148454, the stroller 10 can be configured to be folded in a front-rear direction and then folded, and the width direction can also be miniaturized. Moreover, the stroller 10 shown in FIG. 1 is configured such that the handle is swingably swingable between the back push position (rear position) and the face-to-face push (front position). However, the handlebar may be fixed to the rear position, and the stroller 10 may be configured to be swingable from the rear push position.

10‧‧‧ baby carriage

11‧‧‧ Baby stroller body

12‧‧‧ Front foot

13‧‧‧front wheel holding unit

14‧‧‧ hind feet

15‧‧‧ Rear wheel holding unit

20‧‧‧ Wheels

Claims (12)

A wheel for a stroller, the wheel for the stroller being rotatably held about a rotation axis, and comprising: a rim having an annular base extending in a circumferential direction centered on the rotation axis; and a pair of annular inner ribs, along a direction parallel to the axis of rotation, from a position on the inner base portion to the inner end portion of the base portion, to a radius centered on the rotation axis The outer side of the direction protrudes and extends in the circumferential direction; and the tire is mounted on the rim from the outer side in the radial direction; the tire has an annular tire base, at least by the pair of inner ribs Supporting, in a cross section parallel to both the axial direction and the radial direction, convexly curved outward in the radial direction and extending in the circumferential direction; and an inner protruding portion from the tire base to the radial direction The inner side of the tire base portion is formed to be in contact with the inner side rib; the outer surface of the tire base portion in the radial direction forms a ground contact surface, and the rim includes a pair of rings. The outer ridges project outward in the radial direction from the positions on the base portions of the outer sides of the pair of annular inner ribs in the axial direction, and extend in the circumferential direction; The ribs go outward from the aforementioned base along the aforementioned radial direction The protruding height of the square is higher than the protruding height of the outer rib from the base portion outward in the radial direction. The wheel for a stroller according to claim 1, wherein the outer rib is disposed at a position that is an end portion of the base portion in the axial direction. The wheel for a baby carriage according to claim 1, wherein the tire base portion of the tire is apart from the base portion of the rim between the outer side rib in the axial direction and the inner rib. A wheel for a stroller, the wheel for the stroller being rotatably held about a rotation axis, and comprising: a rim having an annular base extending in a circumferential direction centered on the rotation axis; and a pair of annular inner ribs, along a direction parallel to the axis of rotation, from a position on the inner base portion to the inner end portion of the base portion, to a radius centered on the rotation axis The outer side of the direction protrudes and extends in the circumferential direction; and the tire is mounted on the rim from the outer side in the radial direction; the tire has an annular tire base, at least by the pair of inner ribs Supporting, in a cross section parallel to both the axial direction and the radial direction, convexly curved outward in the radial direction and extending in the circumferential direction; and an inner protruding portion from the tire base to the radial direction The inner side of the tire base portion is formed to be in contact with the inner side rib; the outer surface of the tire base portion in the radial direction forms a ground contact surface. The aforementioned inner protruding portion of the tire is located between any two of the ribs adjacent to the axial direction. A wheel for a stroller, the wheel for the stroller being rotatably held about a rotation axis, and comprising: a rim having an annular base extending in a circumferential direction centered on the rotation axis; and a pair of annular inner ribs, along a direction parallel to the axis of rotation, from a position on the inner base portion to the inner end portion of the base portion, to a radius centered on the rotation axis The outer side of the direction protrudes and extends in the circumferential direction; and the tire is mounted on the rim from the outer side in the radial direction; the tire has an annular tire base, at least by the pair of inner ribs Supporting, in a cross section parallel to both the axial direction and the radial direction, convexly curved outward in the radial direction and extending in the circumferential direction; and an inner protruding portion from the tire base to the radial direction The inner side is protruded and engages with the inner ridge; the outer surface of the tire base in the radial direction forms a ground contact surface, and the inner side of the tire protrudes Located between the pair of inner side bars; in the axial direction between the inner side of a strip, the inner side of the projecting portion of the tire away from the rim of the base. a wheel for a baby carriage, the wheel of which is rotated The center is rotatably held and includes: a rim having an annular base extending in a circumferential direction centered on the aforementioned axis of rotation; and a pair of annular inner ribs extending parallel to the aforementioned axis of rotation The axial direction protrudes outward in a radial direction centering on the rotation axis from a position on the inner base portion which is opposite to the both end portions of the base portion, and extends in the circumferential direction; and the tire The tire is disposed outside the rim in the radial direction; the tire has an annular tire base supported by at least the pair of inner ribs in a cross section parallel to both the axial direction and the radial direction a convex portion that is convexly curved outward in the radial direction and extends in the circumferential direction; and an inner protruding portion that protrudes from the tire base portion inward in the radial direction to be engaged with the inner protruding rib; the tire base portion The outer surface in the radial direction forms a ground contact surface, and the protruding height of the inner protruding portion from the tire base portion is compared with the thickness of the tire base portion. . A wheel for a stroller, the wheel for the stroller being rotatably held about a rotation axis, and comprising: a rim having an annular base extending in a circumferential direction centered on the rotation axis; and a pair of annular inner ribs in a direction parallel to the axis of rotation, from a position on the inner base portion to the inner end portion of the base portion a tire that protrudes outward in a radial direction and extends in the circumferential direction; and a tire that is attached to the rim from the outer side in the radial direction; the tire has an annular tire base, at least by the pair Supported by the inner rib, in a cross section parallel to both the axial direction and the radial direction, convexly curved outward in the radial direction and extending in the circumferential direction; and an inner protruding portion from the tire base And protruding inward in the radial direction, and engaging with the inner ridge; the outer surface of the tire base in the radial direction forms a ground contact surface, and the tire base is in a state where the tire is mounted on the rim Both end portions in the axial direction are located inward in the radial direction from the inner end in the radial direction of the inner protruding portion. A wheel for a stroller according to any one of claims 1 to 7, wherein the aforementioned tire is remote from the aforementioned base of the aforementioned rim. The wheel for a baby carriage according to any one of claims 1 to 7, wherein the tire is subjected to tensile stress in the circumferential direction over the entire axial direction in a state of being mounted on the rim. The wheel for a baby carriage according to any one of claims 1 to 7, wherein in the axial direction, an end portion of the tire base portion is located outside the both end portions of the base portion. A wheel for a baby carriage according to any one of claims 1 to 7, wherein the aforementioned The aforementioned base of the rim extends parallel to the aforementioned axial direction. A stroller comprising a wheel for a stroller of any one of claims 1 to 7.