JP5405431B2 - Traveling wheel - Google Patents

Description

  The present invention relates to a traveling wheel attached to a vehicle body such as a stroller or a shopping cart and rotating on a road surface when the vehicle body travels.

  A vehicle body that travels on the road surface is provided with a plurality of traveling wheels that rotate on the road surface when the vehicle body travels, and each traveling wheel is rotatably attached to the vehicle body by an axle. There are some steps on the road surface on which the vehicle body travels, and when the traveling wheels get over the step on the road surface while the vehicle body travels, the vibrations are transmitted to the vehicle body.

  Thus, for example, Patent Document 1 describes a vehicle wheel having a built-in suspension in order to suppress vibration from the road surface during travel of the vehicle body. This wheel has a hub connected to an axle, a rim disposed on the outer peripheral side of the hub, and a plurality of spiral leaf springs provided between the hub and the rim. When the step is overcome, the spiral leaf spring is elastically deformed, so that the transmission of vibration to the vehicle body is suppressed. Further, in this wheel, the oil chambers formed between the spiral leaf springs are communicated with each other via a restrictor, and the oil in the oil chamber passes through the restrictor due to the elastic deformation of the spiral leaf springs. The damper function is demonstrated.

JP 2003-39901 A

  By the way, the traveling wheel used for a baby stroller, a shopping cart, etc. becomes a small diameter compared with the traveling wheel provided in vehicles, such as a motor vehicle. Therefore, in a traveling wheel such as a stroller or a shopping cart, when the vibration from the road surface is suppressed by incorporating a spiral leaf spring as described in Patent Document 1, the shape of the spiral leaf spring is Get smaller. For this reason, there exists a possibility that it may become difficult to support the hub which a vehicle body load applies with respect to a rim | limb with a spiral leaf | plate spring.

  An object of the present invention is to reliably support a vehicle body load by improving the elastic force of a spring member.

The traveling wheel of the present invention is a traveling wheel that is attached to an axle provided on a vehicle body and rotates on a road surface when the vehicle body travels,
A hub connected to the axle;
An annular rim disposed on the outer peripheral side of the hub;
A shaft fixing portion that is fixed to the hub, an arc-shaped wheel support portion that is abutted against the inner peripheral surface of the rim, and a rotation extending in the circumferential direction between the shaft fixing portion and the wheel support portion. In addition, the shaft fixing portion and the wheel support portion are connected to each other, and a bent portion that is elastically deformable in a radial direction of the axle is provided, and is provided at equal intervals in the circumferential direction between the hub and the rim. possess at least three spring members is supported freely eccentrically said rim relative to the hub, each of said spring member, said wheel support and abut against the arc-shaped of the shaft fixing portion on the outer peripheral surface of the hub And a pair of the bent portions that connect the circumferential ends of the wheel support portion, the pair of bent portions in the circumferential direction toward the side approaching each other from both circumferential ends of the wheel support portion. A first bent portion extending in reverse and an inner end portion of the first bent portion. A second bent portion extending in a circumferential direction toward the sides that are separated from each other; and a second bent portion extending in a circumferential direction from the inner end portion of the second bent portion toward the mutually approaching side, and And a third bent portion respectively connected to both ends in the circumferential direction of the shaft fixing portion .

  In the traveling wheel of the present invention, each of the spring members is a pair of bent portions that connect the end portions in the circumferential direction of the arc-shaped shaft fixing portion and the wheel support portion that are abutted against the outer peripheral surface of the hub. The pair of bent portions includes a first bent portion extending in a circumferential direction from the both circumferential ends of the wheel support portion toward the side approaching each other, and an inner side of the first bent portion A second bent portion extending in a circumferential direction toward the side away from the end portion and a second bent portion extending in the circumferential direction from the inner end portion of the second bent portion toward the mutually approaching side And a third bent portion that extends and is connected to both circumferential ends of the shaft fixing portion.

  The traveling wheel of the present invention is assembled by fitting the spring member and the hub into the rim in a state in which the spring members arranged on the outer peripheral side of the hub are compressed in the radial direction of the axle. It is characterized by that.

  The traveling wheel of the present invention is characterized in that three spring members are provided at equal intervals in the circumferential direction between the hub and the rim.

  According to the present invention, each spring member is provided with a bent portion extending in a circumferential direction between the shaft fixing portion and the wheel support portion and interconnecting the shaft fixing portion and the wheel support portion. Therefore, the elastic force of the spring member can be improved. As a result, even in a small-diameter traveling wheel provided on a vehicle body such as a stroller or a shopping cart, the hub on which the vehicle body load is applied can be reliably supported by the spring member.

(A), (B) is the longitudinal cross-sectional view and cross-sectional view which respectively show the traveling wheel which is 1st Embodiment of this invention. It is a disassembled perspective view of the traveling wheel shown in FIG. (A)-(C) are explanatory drawings which show the assembly process of the traveling wheel shown in FIG. (A)-(C) are explanatory drawings which show the operation | movement at the time of the traveling wheel shown in FIG. 1 getting over the convex part on a road surface. (A), (B) is the longitudinal cross-sectional view and cross-sectional view which respectively show the traveling wheel which is 2nd Embodiment of this invention. It is a disassembled perspective view of the traveling wheel shown in FIG. (A)-(C) are explanatory drawings which show the assembly process of the traveling wheel shown in FIG. (A)-(C) are explanatory drawings which show the operation | movement at the time of the traveling wheel shown in FIG. 5 getting over the convex part on a road surface. (A), (B) is the longitudinal cross-sectional view and cross-sectional view which respectively show the traveling wheel which is 3rd Embodiment of this invention. FIG. 10 is an exploded perspective view of the traveling wheel shown in FIG. 9. (A)-(C) is explanatory drawing which shows the assembly process of the traveling wheel shown in FIG. (A)-(C) is explanatory drawing which shows the operation | movement at the time of the traveling wheel shown in FIG. 9 getting over the convex part on a road surface.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The traveling wheel which is 1st Embodiment of this invention is shown in FIGS.

  The traveling wheel 10 is a small-diameter (about 100 to 200 mm) tire wheel provided on a vehicle body for transportation such as a stroller or a shopping cart that is pushed and pulled by human power, and is attached to both ends of an axle 11 provided on the vehicle body. It has been. During traveling of the vehicle body, the vehicle body travels on the road surface by rotating a plurality of traveling wheels 10 provided on the vehicle body on the road surface. The traveling wheel 10 is a non-driving wheel that freely rotates on the road surface when the vehicle body is pushed and pulled by human power.

  The traveling wheel 10 includes a hub 12 connected to the end of the axle 11, a rim 13 disposed on the outer peripheral side of the hub 12, and three spring members 14 provided between the hub 12 and the rim 13. doing. The hub 12 is formed of a metal material in a cylindrical shape, and an end portion of the axle 11 is inserted into a connection hole 12 a penetrating the shaft center, and the axle 11 is connected to the hub 12. A pair of fixing rings 15 that are abutted against both axial end surfaces of the hub 12 are attached to the axle 11, and the hub 12 is rotatably connected to the connecting shaft 11 by being sandwiched between the fixing rings 15. A bearing may be provided between the connecting shaft 11 and the hub 12.

  The rim 13 is formed in a metal annular shape so as to surround the hub 12 from the outside in the radial direction, and the outer peripheral surface of the hub 12 and the inner peripheral surface of the rim 13 are arranged to face each other with a predetermined interval. Yes. As shown in FIG. 1 (B), a fitting groove 13a is formed on the inner peripheral surface of the rim 13 so as to be positioned at the axial center and open toward the radially inner side. A tire 16 made of a rubber material is mounted on the outer peripheral side of the rim 13, and the traveling wheel 10 rotates on the road surface with the outer peripheral surface of the tire 16 in contact with the road surface. Note that the outer peripheral surface of the rim 13 may be brought into direct contact with the road surface without attaching the tire 16 to the outer peripheral side of the rim 13.

  Each spring member 14 is a resin leaf spring, and is provided between the hub 12 and the rim 13 at equal intervals in the circumferential direction (approximately 60 ° intervals). The spring member 14 includes an arcuate shaft fixing portion 20 that abuts against the outer peripheral surface of the hub 12, an arcuate wheel support portion 21 that abuts against the inner peripheral surface of the rim 13, and the shaft fixing portion 20 and the wheel support portion. 21 and a pair of bent portions 22 that connect the circumferential end portions to each other.

  The shaft fixing portion 20 and the wheel support portion 21 are formed in an arc shape having substantially the same angle with the axle 11 as a center, and the spring member 14 has a substantially fan shape as a whole. The hub 12 is provided with three projections 12b projecting radially outward from the outer circumferential surface at equal intervals in the circumferential direction, and the shaft fixing portion 20 is projected against the outer circumferential surface of the hub 12. It is inserted and fixed between each other. Further, the wheel support portion 21 is fitted in a fitting groove 13 a formed on the inner peripheral surface of the rim 13 in a state of being abutted against the inner peripheral surface of the rim 13. The spring member 14 may be fixed to the hub 12 or the rim 13 by adhesion or the like. Further, a metal leaf spring may be used as the spring member 14, and the spring member 14 may be fixed to the hub 12 or the rim 13 by welding.

  The pair of bent portions 22 includes a first bent portion 22a extending from the both ends in the circumferential direction of the wheel support portion 21 to the side approaching each other (inner circumferential direction) and an inner end of the first bent portion 22a. A second bent portion 22b extending to the side away from the outer side (circumferential direction outer side), and extending from the inner end of the second bent portion 22b to the side approaching each other and connected to both ends of the shaft fixing portion 20 in the circumferential direction. And a third bent portion 22c.

  The first bent portion 22 a is inverted in the circumferential direction from the circumferential end of the wheel support portion 21 toward the inner side in the circumferential direction, and extends inclined toward the inner side in the radial direction of the axle 11. The second bent portion 22b is inverted in the circumferential direction from the inner end portion of the first bent portion 22a to the outer side in the circumferential direction, and is inclined and extended toward the inner side in the radial direction of the axle 11. The third bent portion 22c is inverted in the circumferential direction from the inner end portion of the second bent portion 22b toward the inner side in the circumferential direction, and is inclined and extended inward in the radial direction of the axle 11, and the inner end portion thereof is It is connected to the circumferential end of the shaft fixing portion 20. The bent portion 22 formed of the bent portions 22a to 22c is elastically deformable in the radial direction of the axle 11 between the shaft fixing portion 20 and the wheel support portion 21 and is rimmed with respect to the hub 12 by the respective spring members 14. 13 is supported eccentrically. In other words, each spring member 14 is elastically deformed in the radial direction of the axle 11, so that the axis of the rim 13 can be decentered in the radial direction of the axle 11 with respect to the axis of the hub 12.

  As shown in FIG. 1 (B), substantially disc-shaped cover members 17 are respectively attached between the fixing ring 15 and the rim 13 on both sides in the axial direction of the traveling wheel 10. The cover member 17 prevents the spring member 14 from coming off the rim 13 when an axial load is applied to the traveling wheel 10.

  2 is an exploded perspective view of the traveling wheel shown in FIG. 1, and FIGS. 3A to 3C are explanatory views showing an assembly process of the traveling wheel shown in FIG. This traveling wheel 10 has the shaft fixing portion 20 of each spring member 14 fixed to the hub 12, and the spring members 14 are arranged on the outer peripheral side of the hub 12 at equal intervals in the circumferential direction. As shown, the hub 12 and the spring member 14 are assembled by being fitted in the rim 13.

  As shown in FIG. 3A, when the spring member 14 disposed on the outer peripheral side of the hub 12 is in a natural state, that is, when no external force is applied to the spring member 14, the axis of the hub 12 is centered. The radius R of the outer peripheral surface of the spring member 14 is set to be larger than the radius r of the inner peripheral surface of the rim 13. For this reason, when the hub 12 and the spring member 14 are fitted into the rim 13, as shown in FIG. 3B, the spring members 14 are compressed inward in the radial direction of the axle 11, as shown in FIG. It fits in the fitting groove 13a. As a result, each spring member 14 is mounted in a radially compressed state between the outer peripheral surface of the hub 12 and the inner peripheral surface of the rim 13.

  4 (A) to 4 (C) are explanatory views showing the operation when the traveling wheel shown in FIG. 1 gets over the convex portion on the road surface. Since car bodies such as strollers and shopping carts travel indoors or on paved roads, it is considered that the road surface on which these car bodies travel has irregularities of about 10 to 40 mm. As shown in FIG. 4A, when the traveling wheel 10 travels on a flat road surface 24, the hub 12 to which a vehicle body load is applied is supported by the spring member 14 with respect to the rim 13. The shaft center is disposed at a substantially constant position with respect to the shaft center of the rim 13.

  As shown in FIG. 4 (B), when the traveling wheel 10 gets over the convex portion 25 on the road surface 24, each spring member 14 is elastically deformed in the radial direction of the axle 11, thereby The center is eccentric to the vehicle upper side with respect to the axis of the hub 12. Thereby, the traveling wheel 10 can get over the convex portion 25 on the road surface 24 in a state where the height of the axial center of the hub 12 with respect to the road surface 24 is kept substantially constant. That is, when the traveling wheel 10 gets over the convex portion 25 on the road surface 24, the traveling wheel 10 is lifted upward with respect to the axle 11, so that the height of the axle 11 from the road surface 24 is kept substantially constant. You can drive in the state. Therefore, when the traveling wheel 10 gets over the convex portion 25 on the road surface 24, it is possible to suppress the vibration from the road surface 24 being transmitted to the vehicle body.

  As shown in FIG. 4C, after the traveling wheel 10 gets over the convex portion 25 on the road surface 24, the axial center of the rim 13 is below the vehicle center relative to the axial center of the hub 12 by the restoring force of the spring member 14. As shown in FIG. 4A, the hub 12 is arranged at a substantially constant position with respect to the axis of the rim 13. In FIG. 4, the operation when the traveling wheel 10 gets over the convex portion 25 on the road surface 24 has been described. However, when the traveling wheel 10 gets over the concave portion on the road surface, the axis of the rim 13 is the hub 12. As a result, the vibration from the road surface 24 can be prevented from being transmitted to the vehicle body.

  In this way, the bent portions 22 that extend in the circumferential direction between the shaft fixing portion 20 and the wheel support portion 21 and that connect the shaft fixing portion 20 and the wheel support portion 21 to each other are provided in the respective spring members 14. Therefore, the elastic force of the spring member 14 can be improved as compared with the case where the spring member is a spiral leaf spring. As a result, even in a small-diameter traveling wheel 10 provided on a vehicle body such as a stroller or a shopping cart, the hub 12 on which the vehicle body load is applied can be reliably supported by the spring member 14 with respect to the rim 13.

  Furthermore, since the wheel support portion 21 abutted against the inner peripheral surface of the rim 13 has an arc shape, the contact area between the rim 13 and the spring member 14 can be increased, and the wheel rim 13 is applied to the rim 13 via the spring member 14. The vehicle body load can be dispersed and supported.

  In addition, in car bodies that are pushed and pulled by hand, such as strollers and shopping carts, vibrations transmitted from the road surface 24 to the car body can be suppressed by slowing the speed according to the step position when getting over the step on the road surface 24. Since it is easily possible, a complicated suspension structure as provided in a vehicle such as an automobile is not required. Therefore, it is not necessary to give the traveling wheel 10 a damper function, and the traveling wheel 10 provided with an impact relaxation function by the spring member 14 can have a simple structure.

  5A and 5B are a longitudinal sectional view and a transverse sectional view showing a traveling wheel according to a second embodiment of the present invention, respectively, and FIG. 6 is an exploded perspective view of the traveling wheel shown in FIG. FIGS. 7A to 7C are explanatory views showing an assembly process of the traveling wheel shown in FIG. FIGS. 8A to 8C are explanatory views showing the operation when the traveling wheel shown in FIG. 5 gets over the convex portion on the road surface. 5 to 8, the same members as those described above are denoted by the same reference numerals, and the description thereof is omitted.

  The traveling wheel 30 has three spring members 31 provided between the hub 12 and the rim 13, and each spring member 31 is equally spaced in the circumferential direction between the hub 12 and the rim 13 ( (At intervals of about 60 °). The spring member 31 includes a shaft fixing portion 32 fixed to the hub 12, an arcuate wheel support portion 33 abutted against the inner peripheral surface of the rim 13, and one end in the circumferential direction of the shaft fixing portion 32 and the wheel support portion 33. And a bent portion 34 that connects the portions to each other. The shaft fixing portion 32 extends in the radial direction of the axle 11, and the inner portion of the shaft fixing portion 32 is fixed to the outer peripheral portion of the hub 12. Further, the wheel support portion 33 is fitted in a fitting groove 13 a formed on the inner peripheral surface of the rim 13 in a state of being abutted against the inner peripheral surface of the rim 13. The wheel support portion 33 may be fixed to the inner peripheral surface of the rim 13 by adhesion or the like.

  The bent portion 34 extends from one end in the circumferential direction of the wheel support portion 33 toward the other side in the circumferential direction, and extends from the inner end of the first bent portion 34a toward one side in the circumferential direction. And a second bent portion 34 b connected to the outer end portion of the shaft fixing portion 32. The first bent portion 34a is inverted in the circumferential direction from one end in the circumferential direction of the wheel support portion 33 toward the other side in the circumferential direction, and is inclined and extended inward in the radial direction of the axle 11. The second bent portion 34b extends in a circumferential direction from the inner end of the first bent portion 34a to the one side in the circumferential direction, and inclines inward in the radial direction of the axle 11, and the inner end thereof is a shaft. It is connected to the outer end of the fixed part 32. The bent portion 34 formed of the bent portions 34 a and 34 b is elastically deformable in the radial direction of the axle 11 between the shaft fixing portion 32 and the wheel support portion 33, and is rimmed with respect to the hub 12 by the respective spring members 14. 13 is supported eccentrically.

  This traveling wheel 30 is shown in FIG. 6 with the shaft fixing portions 32 of the spring members 31 fixed to the hub 12 and the spring members 31 arranged on the outer peripheral side of the hub 12 at equal intervals in the circumferential direction. As shown, the hub 12 and the spring member 31 are assembled by being fitted into the rim 13. When the hub 12 and the spring member 31 are fitted into the rim 13, as shown in FIG. 7, the respective spring members 31 are fitted into the fitting grooves 13 a of the rim 13 in a state of being compressed radially inward of the axle 11. It is. Thereby, each spring member 31 is mounted in a state compressed in the radial direction between the outer peripheral surface of the hub 12 and the inner peripheral surface of the rim 13.

  As shown in FIG. 8, when the traveling wheel 30 gets over the convex portion 25 on the road surface 24, each spring member 31 is elastically deformed in the radial direction of the axle 11, so that the axial center of the rim 13 is changed. The hub 12 is eccentric to the vehicle upper side with respect to the axis of the hub 12. Thereby, the traveling wheel 30 can get over the convex portion 25 on the road surface 24 in a state in which the height of the axis of the hub 12 with respect to the road surface 24 is kept substantially constant. Therefore, when the traveling wheel 30 gets over the convex portion 25 on the road surface 24, it is possible to suppress the vibration from the road surface 24 being transmitted to the vehicle body.

  Also in such a traveling wheel 30, a bent portion 34 that extends in the circumferential direction between the shaft fixing portion 32 and the wheel support portion 33 and that connects the shaft fixing portion 32 and the wheel support portion 33 to each other is provided. Since each spring member 31 is provided, the same effect as the traveling wheel 10 shown in FIG. 1 can be obtained.

  9A and 9B are a longitudinal sectional view and a transverse sectional view showing a traveling wheel according to a third embodiment of the present invention, respectively, and FIG. 10 is an exploded perspective view of the traveling wheel shown in FIG. FIGS. 11A to 11C are explanatory views showing the assembly process of the traveling wheel shown in FIG. 12 (A) to 12 (C) are explanatory views showing the operation when the traveling wheel shown in FIG. 9 gets over the convex portion on the road surface. 9 to 12, the same members as those described above are denoted by the same reference numerals, and description thereof is omitted.

  This traveling wheel 40 has three spring members 41 provided between the hub 12 and the rim 13, and each spring member 41 is equally spaced in the circumferential direction between the hub 12 and the rim 13 ( (At intervals of about 60 °). The spring member 41 is an arcuate support member 42 as a wheel support portion that abuts against the inner peripheral surface of the rim 13, and a ring member 43 that is attached to the support member 42 at the outer side and is fixed to the hub 12 at the inner side. And have. The support member 42 is fitted into a fitting groove 13 a formed on the inner peripheral surface of the rim 13 in a state of being abutted against the inner peripheral surface of the rim 13. A mounting portion 42 a that protrudes inward in the radial direction of the axle 11 is provided at a substantially central portion in the circumferential direction of the support member 42, and an outer portion of the ring member 43 is attached to the mounting portion 42 a of the support member 42. ing. The support member 42 may be fixed to the inner peripheral surface of the rim 13 by adhesion or the like.

  The ring member 43 includes a pair of first bent portions 44a extending from the outer portion attached to the attaching portion 42a of the support member 42 toward the sides (circumferential outer sides) away from each other, and the inner side of the first bent portion 44a. A pair of second bent portions 44b extending toward the sides approaching each other (circumferential inner side) from the end portions and the inner ends of the pair of second bent portions 44b are connected to each other and the outer peripheral portion of the hub 12 And a shaft fixing part 45 fixed to the screw.

  The first bent portion 44a is curved inward in the radial direction of the axle 11 and extends in an arc shape from the outer side of the ring member 43 toward the outer side in the circumferential direction. The second bent portion 44b is reversed in the circumferential direction from the inner end portion of the first bent portion 44a toward the inner side in the circumferential direction, and is curved toward the inner side in the radial direction of the axle 11 and extends in an arc shape. . The pair of bent portions 44 including the bent portions 44 a and 44 b are elastically deformable in the radial direction of the axle 11 between the shaft fixing portion 45 and the support member 42, that is, the ring member 43 has the hub 12 and the support member 42. Are elastically deformable in the radial direction of the axle 11, and the rim 13 is supported eccentrically with respect to the hub 12 by the respective spring members 41. In the present embodiment, the shaft fixing portion 45 is fixed to the outer peripheral portion of the hub 12 with screws, but the shaft fixing portion 45 may be fixed to the outer peripheral portion of the hub 12 by bonding or the like.

  In the traveling wheel 40, the shaft fixing portion 45 of each spring member 41 is fixed to the outer peripheral portion of the hub 12, and the spring members 41 are arranged on the outer peripheral side of the hub 12 at equal intervals in the circumferential direction. As shown by an arrow in FIG. 10, the hub 12 and the spring member 41 are assembled by being fitted into the rim 13. When the hub 12 and the spring member 41 are fitted into the rim 13, as shown in FIG. 11, the ring member 43 of each spring member 41 is compressed radially inward into the fitting groove 13a of the rim 13. It is inserted. Thereby, each spring member 41 is mounted in a state compressed in the radial direction between the outer peripheral surface of the hub 12 and the inner peripheral surface of the rim 13.

  As shown in FIG. 12, when the traveling wheel 40 gets over the convex portion 25 on the road surface 24, each spring member 41 is elastically deformed in the radial direction of the axle 11, so that the axis of the rim 13 is The hub 12 is eccentric to the vehicle upper side with respect to the axis of the hub 12. Thereby, the traveling wheel 40 can get over the convex portion 25 on the road surface 24 in a state where the height of the axial center of the hub 12 with respect to the road surface 24 is kept substantially constant. Therefore, when the traveling wheel 40 gets over the convex portion 25 on the road surface 24, it is possible to suppress the vibration from the road surface 24 being transmitted to the vehicle body.

  Also in such a traveling wheel 40, the ring members 43 extending in the circumferential direction between the outer portion attached to the support member 42 and the inner portion as the shaft fixing portion 45 fixed to the hub 12 are respectively provided. Since it provided in the spring member 41, there can exist an effect similar to the traveling wheel 10 shown in FIG.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, in the above embodiment, three spring members 14, 31, 41 are provided on the traveling wheels 10, 30, 40. However, the number of spring members can be arbitrarily changed as long as it is three or more. .

  In the above-described embodiment, a stroller or a shopping cart is used as the vehicle body on which the traveling wheels 10, 30, and 40 are provided. However, the present invention is not limited to this, and for example, traveling such as indoor wagons, transportation carts, and vacuum cleaners. The traveling wheel of the present invention may be applied to a wheel, a bicycle auxiliary wheel, or the like.

DESCRIPTION OF SYMBOLS 10 Traveling wheel 11 Axle 12 Hub 13 Rim 14 Spring member 20 Shaft fixing part 21 Wheel support part 22 Bending part 22a First bent part 22b Second bent part 22c Third bent part 30 Traveling wheel 31 Spring member 32 Shaft fixing part 33 Wheel Support part 34 Bending part 34a First bent part 34b Second bent part 40 Traveling wheel 41 Spring member 42 Support member (wheel support part)
43 ring member 44 bent portion 44a first bent portion 44b second bent portion 45 shaft fixing portion

Claims (3)

A traveling wheel attached to an axle provided on a vehicle body and rotating on a road surface when the vehicle body is traveling,
A hub connected to the axle;
An annular rim disposed on the outer peripheral side of the hub;
A shaft fixing portion that is fixed to the hub, an arc-shaped wheel support portion that is abutted against the inner peripheral surface of the rim, and a rotation extending in the circumferential direction between the shaft fixing portion and the wheel support portion. In addition, the shaft fixing portion and the wheel support portion are connected to each other, and a bent portion that is elastically deformable in a radial direction of the axle is provided, and is provided at equal intervals in the circumferential direction between the hub and the rim. possess at least three spring members is supported freely eccentrically said rim to the hub,
Each of the spring members includes a pair of bent portions that connect circumferential ends of the arc-shaped shaft fixing portion and the wheel support portion that are abutted against the outer peripheral surface of the hub,
The pair of bent portions includes a first bent portion extending in a circumferential direction from the both circumferential ends of the wheel support portion toward the side approaching each other, and an inner end portion of the first bent portion. A second bent portion extending in a circumferential direction toward the sides that are separated from each other; and a second bent portion extending in a circumferential direction from the inner end portion of the second bent portion toward the mutually approaching side, and A traveling wheel, comprising: a third bent portion coupled to both ends in the circumferential direction of the shaft fixing portion .   2. The traveling wheel according to claim 1, wherein the spring member and the hub are fitted into the rim in a state in which each of the spring members arranged on the outer peripheral side of the hub is compressed in the radial direction of the axle. A traveling wheel characterized by being assembled. In running wheel according to any one of claims 1 to 5, three of the spring member is characterized by being kicked set at equal intervals in the circumferential direction between said hub rim Traveling wheels.

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