JP2020192929A - tire - Google Patents

Abstract

To provide a tire which is composed using springs and less likely to be reduced in load durability performance of the tire.SOLUTION: A tire is composed of: a plurality of rim members disposed at different positions on the same axis; a plurality of body springs connecting the plurality of rim members; and a plurality of coupling springs coupled to the body springs so as to regulate relative displacement between the plurality of body springs. A limiting portion is provided which limits the displacement of the coupling spring with respect to the body spring, and at least one of both ends of the coupling spring is not fixed to the plurality of rim members.SELECTED DRAWING: Figure 7

Description

The present invention relates to a tire.

Conventionally, a tire configured by using a coil spring is known. For example, Patent Document 1 discloses a tire in which each of a plurality of coil springs is combined with another coil spring and fixed to an annular rim to form a toroidal shape as a whole.

International Publication No. 2010/138150

However, in the tire disclosed in Patent Document 1, since all the springs (coil springs) are fixed to the annular rim, the springs are densely packed in the vicinity of the fixed position of the spring to the annular rim. On the other hand, when the number of springs is reduced in order to reduce the dense state of the springs, the durability performance for supporting the load becomes low when the tire is loaded.

It is an object of the present invention to provide a tire configured by using a spring, in which it is difficult to reduce the load endurance performance of the tire.

(1) In the tire of the present invention, a plurality of rim members arranged at different positions on the same axis, a plurality of main body springs connecting each of the plurality of rim members, and a plurality of main body springs are connected to each other. It is composed of a plurality of connecting springs connected to the main body spring so as to regulate the relative displacement of the main body spring, and has a limiting portion for limiting the displacement of the connecting spring with respect to the main body spring, and both ends of the connecting spring. At least one of them is not fixed to the plurality of rim members. Therefore, in a tire configured by using a spring, the load durability performance of the tire is reduced and it becomes difficult.

(2) In the tire of the present invention, the connecting spring has an elastically deformed portion and the limiting portion, and the limiting portion is preferably provided at one end of the elastically deformed portion. According to this configuration, the displacement of one end side of the spring can be limited.

(3) In the tire of the present invention, it is preferable that the elastically deformed portion and the limiting portion are formed of an integral member. According to this configuration, the main body spring can be easily manufactured.

(4) In the tire of the present invention, the limiting portion preferably has a ring-shaped portion. According to this configuration, the limiting portion can be easily manufactured.

(5) It is preferable that the tire of the present invention further includes a wire passing through the ring-shaped portion of the limiting portion of the plurality of connecting springs. According to this configuration, it is possible to limit the relative displacement between the connecting springs connected by the wire.

(6) In the tire of the present invention, it is preferable that the elastically deformed portion extends over the entire width direction of the tire. According to this configuration, the durability of the tire can be improved at least in the contact area.

(7) In the tire of the present invention, it is preferable that the limiting portion is composed of an independent member different from the connecting spring. According to this configuration, it becomes easy to freely select a place where the displacement of the connecting spring is restricted.

According to the present invention, it is possible to provide a tire configured by using a spring, in which it is difficult to reduce the load endurance performance of the tire.

It is external perspective view of the tire which concerns on one Embodiment of this invention. It is an external perspective view of the wheel part of FIG. It is the schematic which shows an example of the main body spring which constitutes the grounding deformation part of FIG. It is the schematic which shows an example of the mode of engagement of the main body spring with a rim member. FIG. 4 is a sectional view taken along the line AA of FIG. FIG. 4 is a cross-sectional view taken along the line BB of FIG. It is the schematic which shows an example of the connecting spring which constitutes the grounding deformation part of FIG. It is the schematic for demonstrating an example of the connection method of the connection spring with respect to the main body spring. It is the schematic for demonstrating an example of the connection method of the connection spring with respect to the main body spring. It is the schematic for demonstrating an example of the connection method of the connection spring with respect to the main body spring. It is the schematic which shows one modification of the restriction part. It is the schematic which shows one modification of the locking part. It is the schematic which shows one modification of the main body spring and the connecting spring. It is a schematic diagram which shows one modification of the connecting member. It is the schematic which shows the example of the coupling between the main body springs using the connecting member of FIG.

Hereinafter, embodiments of the present invention will be illustrated with reference to the drawings.

FIG. 1 is an external perspective view of a tire according to an embodiment of the present invention. As shown in FIG. 1, the tire 1 according to the present embodiment is composed of a wheel portion 10 provided with a rim portion and a ground deformation portion 20 capable of being grounded and deformed.

FIG. 2 is an external perspective view of the wheel portion 10 of FIG. The wheel portion 10 includes a plurality of rim members. In the present embodiment, as shown in FIGS. 1 and 2, the wheel portion 10 includes a first rim member 101 and a second rim member 102 as rim members. The number of the plurality of rim members included in the wheel portion 10 does not necessarily have to be two as in the present embodiment, but may be two or more. In the present embodiment, the wheel portion 10 further includes a plurality of connecting members 103 as shown in FIG.

The first rim member 101 and the second rim member 102 are made of metal or resin. The first rim member 101 and the second rim member 102 are arranged at different positions on the same axis. The first rim member 101 and the second rim member 102 are each formed in an annular shape. In the present embodiment, the first rim member 101 and the second rim member 102 are configured to have the same size and shape. However, as long as the tire 1 can function as a tire, the first rim member 101 and the second rim member 102 may be configured in different sizes or shapes. The outer diameters of the first rim member 101 and the second rim member 102 may be appropriately determined according to the required size of the tire 1.

The connecting member 103 is a member that connects the first rim member 101 and the second rim member 102. The connecting member 103 is made of metal or resin. In the present embodiment, as shown in FIG. 2, the wheel portion 10 includes six connecting members 103, but the number of connecting members 103 included in the wheel portion 10 is not limited to this. The plurality of connecting members 103 are attached to one side of the ring-shaped first rim member 101 and one side of the ring-shaped second rim member 102. Hereinafter, in the present specification, with respect to the wheel portion 10, the side to which the connecting member 103 is attached to the first rim member 101 and the second rim member 102 is inside in the tire width direction, and the connecting member 103 is not attached. The side is referred to as the outside in the tire width direction.

In the present embodiment, the first rim member 101 and the second rim member 102 have an engaging receiving portion 105 (see FIG. 5) capable of engaging the main body spring 201 of the ground contact deformed portion 20 on the inner surface in the tire width direction. Have. The details of the engagement receiving portion and the details of the mode of engagement will be described later. In addition, in this specification, "engagement" means to be fitted, and "locking" means to be widely fastened including being fitted.

In this embodiment, as shown in FIG. 2, the support member 104 is attached to the first rim member 101 and the second rim member 102. The support member 104 is a member that maintains the engaged state of the grounding deformed portion 20 that is engaged with the engaging receiving portion 105 (see FIG. 5). The support member 104 can be fixed to the inside of the first rim member 101 and the second rim member 102 in the tire width direction by using, for example, bolts.

In the present embodiment, the grounding deformation portion 20 is composed of a member including an elastic deformation portion. In the present embodiment, as shown in FIG. 1, the grounding deformation portion 20 includes two types of members, a main body spring 201 and a connecting spring 211. The main body spring 201 and the connecting spring 211 are made of metal.

FIG. 3 is a schematic view showing an example of the main body spring 201 constituting the grounding deformation portion 20 of FIG. The main body spring 201 connects between a plurality of rim members. In the present embodiment, the main body spring 201 connects between the first rim member 101 and the second rim member 102. When the tire 1 has three or more rim members, the main body spring 201 is adjacent to the rim member building in the same manner as the procedure for connecting the first rim member 101 and the second rim member 102 described in this specification. It is preferable to connect each of the above, but at least one between adjacent rim members may be connected. As shown in FIG. 3, the main body spring 201 has an elastically deformed portion 202 and a locking portion 203.

In the present embodiment, the elastic deformation portion 202 is composed of a coil spring. Here, the coil spring is a spring that elastically deforms in response to a load, and is a spring that is wound in a coil shape (spiral shape) around a predetermined shaft. As the elastically deformed portion 202, an elastically deformed portion 202 having an appropriate material and elasticity can be used depending on the size and weight of the tire 1, the required properties of the grounded deformed portion 20, and the like.

The locking portions 203 are provided at both ends of the elastically deformed portion 202. The locking portion 203 locks the main body spring 201 to the wheel portion 10. The locking portion 203 has a shape different from that of the elastically deformed portion 202. That is, in the present embodiment, the locking portion 203 has a shape different from the coil shape.

In the present embodiment, the locking portion 203 is composed of a member integrated with the elastically deforming portion 202. That is, in the present embodiment, for example, as shown in FIG. 3, the material constituting the elastically deformed portion 202 extends from both ends of the elastically deformed portion 202 to form the locking portion 203.

In the present embodiment, for example, as shown in FIG. 3, the locking portion 203 includes a linearly formed straight portion 203a connected to both ends of the elastically deformed portion 202. Further, in the present embodiment, for example, as shown in FIG. 3, the locking portion 203 includes a bent portion 203b bent with respect to the straight portion 203a on the tip end side of the straight portion 203a. In the present embodiment, the bent portion 203b is bent so as to be orthogonal to the straight portion 203a in the side view of the main body spring 201 (in the plane including the axis of the main body spring 201).

Here, with reference to FIGS. 4 to 6, the details of the mode of engagement of the main body spring 201 with the wheel portion 10 in the present embodiment will be described. Of the locking portions 203 provided at both ends of the main body spring 201, one locking portion 203 is engaged with the first rim member 101, and the other locking portion 203 is engaged with the second rim member 102. ing. Here, an example in which one locking portion 203 is engaged with the first rim member 101 will be described, but the other locking portion 203 is engaged with the second rim member 102 in the same manner. be able to.

FIG. 4 is a schematic view showing an example of the mode in which the main body spring 201 is engaged with the first rim member 101, and the engaged state of the main body spring 201 is viewed from the inside of the first rim member 101 in the tire width direction. It is a schematic diagram in the case of. Although only a part of the first rim member 101 to which the main body spring 201 is engaged is shown in FIG. 4, in reality, as shown in FIG. 4, the entire circumference of the first rim member 101 is shown. The main body spring 201 is engaged with the first rim member 101.

In the present embodiment, as shown in FIG. 4, in the main body spring 201, the locking portion 203 engages with the engaging receiving portion 105 provided on the inner surface of the first rim member 101 in the tire width direction. By doing so, it can be engaged with the first rim member 101. In the present embodiment, in particular, the engagement receiving portion 105 is configured as a hole into which the bent portion 203b of the locking portion 203 can be inserted, and by inserting the bent portion 203b into the hole of the engaging receiving portion 105, The main body spring 201 is engaged with the first rim member 101. By attaching the support member 104 to the inside of the first rim member 101 in the tire width direction while the locking portion 203 is engaged with the engaging receiving portion 105, the engaged state of the locking portion 203 is firmly fixed. be able to.

FIG. 5 is a cross-sectional view taken along the line AA of FIG. 4, specifically, is a cross-sectional view of the first rim member 101 at a portion including an engaging receiving portion. As shown in FIG. 5, the first rim member 101 has an engagement receiving portion 105. In the present embodiment, the engagement receiving portion 105 is configured as a hole into which the bent portion 203b can be inserted. In the present embodiment, the engagement receiving portion 105 is configured as a bottomed hole. The length of the hole in the engaging receiving portion 105 in the extending direction (depth of the hole) is preferably longer than the length of the bent portion 203b. As a result, the entire bent portion 203b can be inserted into the engaging receiving portion 105, and the engaged state can be easily stabilized. However, the engaging receiving portion 105 may be configured as a bottomless hole (through hole).

The cross-sectional shape of the hole of the engaging receiving portion 105 is not limited as long as the bent portion 203b is inserted, and may be, for example, an oval shape, an elliptical shape, a rectangular shape, a polygonal shape, or the like. In order for the elastically deformed portion 202 to be locked (fixed) more reliably, it is preferable that the shape and size of the cross section of the hole are substantially the same as the shape and size of the cross section of the bent portion 203b.

In the main body spring 201, when the bent portion 203b is inserted into the engaging receiving portion 105, the elastically deformed portion 202 except for at least a part thereof is radially outside the tire of the annular first rim member 101 (FIG. 5). And it is arranged so as to be located on the upper side of FIG. In this state, the support member 104 is attached to the first rim member 101 on the inside of the first rim member 101 in the tire width direction (left side of FIGS. 5 and 6). As shown in FIG. 5, for example, the support member 104 is positioned so as to suppress the bent portion 203b inserted into the hole of the engaging receiving portion 105, that is, the bent portion 203b is inserted from the hole of the engaging receiving portion 105. It is installed in a position where it can be prevented from slipping out. Preferably, the support member 104 is attached at a position that closes the hole of the engagement receiving portion 105 in a state where the main body spring 201 is not inserted. Further, for example, as shown in FIG. 5, the support member 104 has a first rim member 101 so as to hold the straight portion 203a of the locking portion 203 on the inner surface of the first rim member 101 in the tire width direction. Is fixed to. In this way, the engaging state of the locking portion 203 is stably fixed by the support member 104.

The support member 104 is attached to the first rim member 101 using, for example, a bolt 106. FIG. 6 is a cross-sectional view taken along the line BB of FIG. 4, specifically, is a cross-sectional view of the first rim member 101 including a bolt 106 for fixing the support member 104. As shown in FIG. 6, the support member 104 is fixed to the first rim member 101 by bolts 106. As shown in FIG. 4, the support member 104 may be fixed to the first rim member 101 at a position (center) between the two main body springs 201 engaged with the first rim member 101. .. That is, in the first rim member 101, one bolt hole 107 for fixing the bolt 106 is formed between two adjacent engaging receiving portions 105 in the circumferential direction of the annular first rim member 101. ing. As a result, the support member 104 can be fixed to the first rim member 101 without interfering with the engaging position of the main body spring 201.

The support member 104 may be configured as one annular member, or may be configured as a plurality of divided members having an annular shape as a whole. In that case, the support members 104 may be arranged so as to be in contact with each other at the circumferential ends, or may be arranged at appropriate intervals. When the support member 104 is configured as a plurality of divided members, each member has a fan shape, for example.

In the present embodiment, the first rim member 101 has one locking portion 203 (more specifically, the bent portion 203b) of the main body spring 201 of the first rim member 101 in the manner described above over the entire circumference. The support member 104 is fixed to the first rim member 101 by being engaged with the engagement receiving portion 105. In this way, the locking portion 203 is locked to the first rim member 101. Further, in the same manner, the other locking portion 203 (more specifically, the bent portion 203b) of the main body spring 201 is engaged with the second rim member 102 over the entire circumference of the second rim member 102. The support member 104 is fixed to the second rim member 102 by being engaged with the portion. In this way, the locking portion 203 is locked to the second rim member 102. At this time, in the present embodiment, one locking portion 203 and the other locking portion 203 of one main body spring 201 are the first rim member 101 with respect to the first rim member 101 and the second rim member 102. And the second rim member 102 may be engaged with an engaging receiving portion located on one straight line in the axial direction. That is, in the present embodiment, the two locking portions 203 of one main body spring 201 may be fixed at the same positions in the circumferential direction with respect to the first rim member 101 and the second rim member 102. However, the two locking portions 203 of one main body spring 201 do not necessarily have to be fixed at the same positions in the circumferential direction with respect to the first rim member 101 and the second rim member 102.

The quantity and spacing of the main body springs 201 engaged with the first rim member 101 and the second rim member 102 depend on the size and weight of the tire 1, the required properties of the ground contact deformed portion 20, and the like. , May be determined as appropriate. The quantity and spacing of the bolts 106 used to attach the support member 104 to the first rim member 101 and the second rim member 102 may also be appropriately determined. For example, the bolt 106 does not necessarily have to be attached one by one between two engaging receiving portions 105 adjacent to each other in the circumferential direction as in the present embodiment.

In the tire 1 according to the present embodiment, the ground contact deformed portion 20 is formed by connecting the plurality of main body springs 201 engaged with the wheel portion 10 with the connecting spring 211 in this way. That is, in the present embodiment, the connecting spring 211 functions as a connecting member that connects the adjacent main body springs 201. FIG. 7 is a schematic view showing an example of the connecting spring 211 constituting the grounding deformation portion 20 of FIG. In the present embodiment, as shown in FIG. 7, the connecting spring 211 has an elastically deformed portion 212 and a limiting portion 213. Specifically, the connecting spring 211 is arranged between two main body springs 201 engaged in the wheel portion 10 and adjacent to each other in the circumferential direction, and is combined with these two main body springs 201 to form the main body spring 201. Is connected with.

In the present embodiment, the elastically deformed portion 212 is composed of a coil spring. As the elastically deformed portion 212, an elastically deformed portion 212 having an appropriate material and elasticity can be used depending on the size and weight of the tire 1, the required properties of the grounded deformed portion 20, and the like. The diameter of the coil spring constituting the elastically deformed portion 212 is preferably close to the diameter of the coil spring constituting the elastically deformed portion 202 of the main body spring 201. Here, the diameter of the coil spring is the diameter of the circumscribed circle when the coil spring is viewed from the axial direction, and the same applies hereinafter. The closer the diameter of the coil spring that constitutes the elastically deformed portion 212 is to the diameter of the coil spring that constitutes the elastically deformed portion 202 of the main body spring 201, the closer the coil spring that constitutes the elastically deformed portion 202 and the coil that constitutes the elastically deformed portion 212 are. When the spring and the spring are connected to form the ground deformation portion 20 as described later, the force is likely to be evenly applied. For example, the diameters of the coil springs that make up the elastically deformed portion 202 and the coil springs that make up the elastically deformed portion 212 can both be 15 mm to 25 mm, for example, 20 mm.

In the present embodiment, the limiting portion 213 is provided at one end of the elastically deforming portion 212. No other mechanism is configured at the other end of the elastically deformed portion 212 where the limiting portion 213 is not provided. Therefore, the elastically deformed portion 212 has a shape that is interrupted at the other end side. .. The limiting portion 213 limits the displacement of the connecting spring 211 connected to the main body spring 201 with respect to the main body spring 201. The limiting portion 213 may limit the displacement of the connecting spring 211 with respect to the main body spring 201 in at least one direction. By limiting the displacement of the connecting spring 211 with respect to the main body spring 201 by the limiting portion 213 in this way, the connecting spring 201 is connected to the main body spring 201 as described later with reference to FIGS. 8A, 8B and 8C. When the springs 211 are connected, the connecting position of the connecting springs 211 is determined and fixed. That is, the connection state of the connection spring 211 with respect to the main body spring 201 is positioned and fixed. The limiting portion 213 has a shape different from that of the elastically deformed portion 212. That is, in the present embodiment, the limiting portion 213 has a shape different from the coil shape.

In the present embodiment, the limiting portion 213 is composed of a member integrated with the elastically deforming portion 212. That is, in the present embodiment, for example, as shown in FIG. 7, the material constituting the elastically deformed portion 212 extends from one end of the elastically deformed portion 212 to form the limiting portion 213. In the example shown in FIG. 7, the limiting portion 213 has a ring-shaped portion formed by bending the wire forming the elastically deformed portion 212 into a ring shape. The ring shape is formed so as to have a central axis in a direction intersecting the axis A direction of the elastically deformed portion 212. The ring-shaped portion of the limiting portion 213 may have an arbitrary size capable of limiting the displacement of the connecting spring 211. For example, the ring-shaped portion of the limiting portion 213 may be configured such that the diameter is 0.5 to 1.0 times the diameter of the elastically deformed portion 212.

Here, the function of the limiting portion 213 will be described together with a method of connecting the connecting spring 211 to the main body spring 201. 8A and 8B are schematic views for explaining an example of a method of connecting the connecting spring 211 to the main body spring 201.

As shown in FIG. 8A, the connecting spring 211 is hooked on the elastically deformed portion 202 of the main body spring 201 engaged with the wheel portion 10 by the elastically deformed portion 212, and is connected to the two adjacent main body springs 201. Assembled and connected to these two main body springs 201. Specifically, the connecting spring 211 is connected to the main body spring 201 so as to regulate the relative displacement between the two main body springs 201 adjacent to each other in the circumferential direction. At this time, the connecting spring 211 is inserted into the main body spring 201 so as to move forward while rotating, starting from the other end side where the limiting portion 213 is not provided, so that the connecting spring 211 and the two adjacent main body springs 201 Gradually combined.

When the entire elastically deformed portion 212 of the connecting spring 211 is combined with the main body spring 201, the limiting portion 213 eventually comes into contact with the main body spring 201, as shown in FIG. 8B. Due to its shape, the limiting portion 213 cannot be combined with the main body spring 201. Therefore, the connecting spring 211 does not move toward the insertion direction side from the position where the limiting portion 213 comes into contact with the main body spring 201. In particular, the connecting spring 211 does not advance (move to the insertion direction side) even if it tries to advance while rotating after the ring-shaped portion of the limiting portion 213 comes into contact with the main body spring 201. In this way, the limiting portion 213 limits the displacement of the connecting spring 211 with respect to the main body spring 201 in at least one direction. In this way, the connecting state of the connecting spring 211 with respect to the main body spring 201 is positioned and fixed by the limiting portion 213. Further, the connecting spring 211 connected to the main body spring 201 is less likely to come off from the main body spring 201.

At least one of both ends of the connecting spring 211 is not fixed to the first rim member 101 and the second rim member 102. In the present embodiment, the connecting spring 211 is not fixed to the first rim member 101 and the second rim member 102 at both ends. That is, in the present embodiment, both ends of the connecting spring 211 are non-fixed. However, the connecting spring 211 may have only one end of both ends fixed to the first rim member 101 or the second rim member 102. In this case, of both ends of the connecting spring 211, the other end opposite to one end provided with the limiting portion 213 is fixed to the first rim member 101 or the second rim member 102.

In the present embodiment, all the main body springs 201 engaged with the wheel portion 10 are connected to the connecting springs 211 so that the connecting springs 211 are arranged between the two adjacent main body springs 201. In this embodiment, the tire 1 is configured in this way. That is, in the present embodiment, all the main body springs 201 of the ground contact deformed portion 20 of the tire 1 are connected to the two connecting springs 211, and all the connecting springs 211 of the ground deformed portion 20 of the tire 1 are two. It is connected to the main body spring 201. At this time, since the tire 1 can limit the displacement of the connecting spring 211 with respect to the main body spring 201 in at least one direction by the limiting portion 213, the connecting spring 211 connected to the main body spring 201 is less likely to come off from the main body spring 201. Therefore, the connecting spring 211 is mainly located in the ground contact region of the tire 1, and is not located in the vicinity of the fixed positions of the first rim member 101 and the second rim member 102 and the main body spring 201. As a result, the elastically deformed portion 202 of the main body spring 201 and the elastically deformed portion 212 of the connecting spring 211 are located in the ground contact region of the tire 1, while the first rim member 101, the second rim member 102, and the main body spring 201 Only the elastically deformed portion 202 of the main body spring 201 is located in the vicinity of the fixed position of. Therefore, according to the tire 1 according to the present embodiment, the elastically deformed portion 202 of the main body spring 201 while improving the dense state of the elastically deformed portion 202 at the fixed positions to the first rim member 101 and the second rim member 102. The elastically deformed portion 212 of the connecting spring 211 makes it difficult to reduce the load durability performance of the tire 1.

It is also possible that the connecting spring 211 that connects the two main body springs 201 is inserted from the side of the first rim member 101 in the axial direction of the wheel portion 10 (that is, the rotation axis direction of the tire 1). It can also be inserted from the side of the rim member 102. It is preferable that half of the plurality of connecting springs 211 provided on the tire 1 are inserted from the side of the first rim member 101, and the other half are inserted from the side of the second rim member 102. As a result, the limiting portions 213 of the connecting spring 211 are evenly arranged on both sides in the axial direction of the tire 1, making it easier to balance the tire 1 and limiting the limiting portion in only one direction in the axial direction of the tire 1. It is possible to prevent the 213 from being crowded. In particular, as shown as an example in FIG. 8C, it is more preferable that the plurality of connecting springs 211 have the connecting springs 211 adjacent to each other in the circumferential direction of the grounding deformation portion 20 inserted from different directions. This makes it easier to balance the tire 1.

Further, the tire 1 may further include a connecting member for connecting the ring-shaped portions of the limiting portions 213 of the plurality of connecting springs 211. The connecting member is composed of, for example, a wire. For example, it is assumed that half of the plurality of connecting springs 211 are inserted from the side of the first rim member 101 and the other half are inserted from the side of the second rim member 102. In this case, the limiting portion 213 of the connecting spring 211 inserted from the side of the first rim member 101 is located on the side of the first rim member 101, and the limiting portion 213 of the connecting spring 211 inserted from the side of the second rim member 102. Is located on the second rim member 102 side. In this case, the tire 1 has a wire connecting the ring-shaped portions of the plurality of limiting portions 213 located on the first rim member 101 side and a ring-shaped portion of the plurality of limiting portions 213 located on the second rim member 102 side. It may have two wires, one with a wire connecting the portions. The wire connecting the ring-shaped portions of the plurality of limiting portions 213 located on the first rim member 101 side is, for example, all the ring-shaped portions of the plurality of limiting portions 213 located on the first rim member 101 side. It is provided along the circumferential direction of the wheel portion 10 so as to pass through the central portion (opening formed by the ring-shaped portion). Similarly, the wire connecting the ring-shaped portions of the plurality of limiting portions 213 located on the second rim member 102 side is, for example, all the ring-shaped portions of the plurality of limiting portions 213 located on the second rim member 102 side. It is provided along the circumferential direction of the wheel portion 10 so as to pass through the central portion of the portion. By forming such a wire in a circular shape, for example, the ring-shaped portions of the limiting portion 213 can be connected to each other by passing through the central portion of the ring-shaped portion of the limiting portion 213. In this way, by providing the wires passing through the ring-shaped portions of the plurality of limiting portions 213, the displacement of the relative positional relationship between the limiting portions 213 is restricted by the wires. Therefore, the connecting spring 211 coupled to the main body spring 201 is more difficult to be detached from the main body spring 201.

However, the connecting member that connects the ring-shaped portions of the limiting portions 213 of the plurality of connecting springs 211 does not necessarily have to be configured to pass through the ring-shaped portions of the limiting portions 213 as described above. The limiting portions 213 may be connected to each other in any form. In this case, for example, the connecting member may connect the ring-shaped portions of the plurality of limiting portions 213 by being fixed to each of the ring-shaped portions of the plurality of limiting portions 213 to be connected. At least, by providing the wire connecting the limiting portions 213 of the plurality of connecting springs 211, the displacement of the relative positional relationship between the connecting springs 211 connected by the wire is limited.

In the above embodiment, it has been explained that the limiting portion 213 is formed in a ring shape having a central axis in a direction intersecting the axis A direction of the elastically deforming portion 212, but the shape of the limiting portion 213 is the same. Not limited. The limiting portion 213 may have an arbitrary configuration capable of limiting the displacement of the connecting spring 211 with respect to the main body spring 201 in at least one direction.

Further, in the above embodiment, it has been explained that the limiting portion 213 is composed of a member integrated with the elastic deforming portion 212, but the limiting portion 213 is not necessarily composed of a member integrated with the elastic deforming portion 212. May be good. For example, as schematically shown in FIG. 9, the displacement of the connecting spring 211 with respect to the main body spring 201 may be limited by the limiting portion 213 composed of independent members, which is different from the connecting spring 211. In the example shown in FIG. 9, the limiting portion 213 is configured as an independent member separate from the connecting spring 211 that limits the displacement of the contact portion between the main body spring 201 and the connecting spring 211 combined with each other. ing. In this case, it becomes easy to freely select a portion that limits the displacement of the connecting spring 211.

The length of the connecting spring 211 may be appropriately determined according to the size and weight of the tire 1, the required properties of the ground contact deformed portion 20, and the like. It is preferable that the length of the elastically deformed portion 212 of the connecting spring 211 is shorter than the length of the elastically deformed portion 202 of the main body spring 201. The connecting spring 211 preferably has a length such that the elastically deformed portion 212 extends over the entire width direction of the tire 1. That is, in the connecting spring 211, it is preferable that the elastically deformed portion 212 extends at least over the maximum width of the tire 1 in the width direction of the tire 1. The position of the end portion of the connecting spring 211 in the width direction when the connecting spring 211 extends over the maximum width of the tire is indicated by a broken line L in FIG. However, in FIG. 1, only the position of one end of both ends of the connecting spring 211 is indicated by the alternate long and short dash line L. The position of the other end of the connecting spring 211 is a plane orthogonal to the rotation axis of the tire 1 and is a plane-symmetrical position with respect to the central plane in the width direction of the tire 1. Since the elastically deformed portion 212 of the connecting spring 211 extends over the entire width direction of the tire 1, at least a region of the elastically deformed portion 202 of the main body spring 201 that comes into contact with the ground is connected to the elastically deformed portion 212 of the connecting spring 211. And the durability can be improved.

The elastically deformed portion 212 of the connecting spring 211 preferably extends over the entire crown portion of the tire 1. The crown portion bulges outward in the radial direction of the tire 1 from a side portion formed on substantially the same surface as the surfaces of the first rim member 101 and the second rim member 102 in the ground contact deformed portion 20 of the tire 1. It is a place. It is more preferable that the elastically deformed portion 212 of the connecting spring 211 extends to the buttress portion of the tire 1. The buttress portion is a portion between the side portion and the crown portion in the grounding deformation portion 20. In the ground deformation portion 20, the portion connected by the connecting spring 211 is less likely to be deformed by the binding force of the connecting spring 211, and the portion not connected by the connecting spring 211 is deformed by the amount that the binding force of the connecting spring 211 does not work. However, by arranging the elastically deformed portion 212 on the crown portion and the buttless portion as described above, the deformation of the crown portion and the buttless portion can be suppressed. On the other hand, by preventing the binding force of the connecting spring 211 from acting on the side portion, it is possible to absorb the vibration of the tire 1 when it touches the ground.

In the tire 1 according to the present embodiment, each of the plurality of main body springs 201 constituting the ground contact deformed portion 20 has a different shape from the elastic deformed portion 202 and the elastic deformed portions 202 provided at both ends of the elastic deformed portion 202. The locking portion 203 is locked to the first rim member 101 and the second rim member 102. As a result, the main body spring 201 can be reliably coupled to the first rim member 101 and the second rim member 102. Due to such an effect, for example, the main body spring 201 is unlikely to come off from the first rim member 101 and the second rim member 102 even when the usage environment of the tire 1 is special. Further, for example, if the elastically deformed portion 202 of the main body spring 201 is directly connected to the first rim member 101 and the second rim member 102, the elastically deformed portion 202 may be the first rim member depending on the method of connection. While the elastically deformed portion 202 is likely to fall off from the first rim member 101 and the second rim member 102 due to wear of the elastically deformed portion 202, the elastically deformed portion 202 is likely to fall off from the first rim member 101 and the second rim member 102. In the present embodiment, since the locking portion 203 having a shape different from that of the elastically deformed portion 202 is locked, such a possibility is small. Further, for example, even when the tire 1 according to the present embodiment is used on a lunar surface having a large temperature change, the main body spring 201 is engaged with the engaging receiving portion 105 of the first rim member 101 and the second rim member 102. Therefore, even if thermal expansion or contraction occurs in the first rim member 101, the second rim member 102, or the main body spring 201, the main body spring 201 is unlikely to come off from the first rim member 101 and the second rim member 102. , It becomes easy to maintain the form and function as the tire 1.

Further, as in the present embodiment, the first rim member 101 and the second rim member 102 have an engagement receiving portion 105, and the locking portion 203 of the main body spring 201 is locked to the engaging receiving portion 105. In this case, the main body spring 201 can be more reliably coupled to the first rim member 101 and the second rim member 102.

Further, when the locked state of the locking portion 203 is maintained by using the support member 104 as in the present embodiment, the main body spring 201 is more difficult to be disengaged from the first rim member 101 and the second rim member 102. Therefore, the plurality of main body springs 201 can be more reliably engaged with the engagement receiving portion 105 of the first rim member 101 and the second rim member 102.

In the above embodiment, it has been explained that the locking portion 203 of the main body spring 201 includes a straight portion 203a and a bent portion 203b arranged on the tip end side of the straight portion 203a. However, the configuration of the locking portion 203 is not necessarily limited to this. The locking portion 203 has a shape different from that of the elastically deformed portion 202, and may have an arbitrary shape that can be locked to the first rim member 101 and the second rim member 102. Further, the engaging receiving portion 105 of the first rim member 101 and the second rim member 102 may also have an arbitrary configuration corresponding to the configuration of the locking portion 203. For example, the locking portion 203 may be formed in a straight line. In this case, the first rim member 101 and the second rim member 102 may be provided with an engaging receiving portion capable of engaging the linear locking portion 203, and the locking portion 203 is simply provided by the support member 104. May be fixed.

The locking portion 203 is not limited to the example described in the present specification, and may have an arbitrary configuration in which the main body spring 201 can be locked to the first rim member 101 and the second rim member 102. For example, the locking portion 203 may be formed in a hook shape.

Further, for example, in the above embodiment, it has been explained that the bent portion 203b of the locking portion 203 of the main body spring 201 is bent so as to be orthogonal to the straight portion 203a. However, the bent portion 203b does not necessarily have to be orthogonal to the straight portion 203a. The bent portion 203b may be bent at a predetermined angle with respect to the straight portion 203a. In this case, the engaging receiving portion 105 may be formed as a hole provided in a direction corresponding to the bending angle of the bent portion 203b.

Further, the locking portion 203 of the main body spring 201 is configured to include, for example, a straight portion 203a and a ring portion 203c arranged on the tip end side of the straight portion 203a, as shown in FIG. Good. The ring portion 203c is formed in an annular shape having a through hole 203d in the center. In this case, the engaging receiving portion 105 may be composed of, for example, a protrusion capable of penetrating the through hole 203d. In this case, the locking portion 203 can be locked to the engaging receiving portion 105 by penetrating the protrusion of the engaging receiving portion 105 through the through hole 203d of the ring portion 203c of the locking portion 203.

Further, in the above embodiment, it has been described that the elastically deformed portion 202 of the main body spring 201 and the elastically deformed portion 212 of the connecting spring 211 are each composed of a coil spring. However, the elastically deformed portion 202 of the main body spring 201 and the elastically deformed portion 212 of the connecting spring 211 do not necessarily have to be composed of a coil spring. For example, the elastically deformed portion 202 of the main body spring 201 and / or the elastically deformed portion 212 of the connecting spring 211 is replaced with the coil spring, for example, as shown in FIG. It may be configured to include a corrugated metal member (extending along). The example shown in FIG. 11 is an example in which the elastically deformed portion 202 and the elastically deformed portion 212 are formed in a two-dimensional wave shape. The corrugated metal member may have, for example, a shape in which semicircles are connected or a sinusoidal shape. Even in this case, the main body spring 201 and the connecting spring 211 can be connected by combining the corrugated metal members.

Further, in the above embodiment, it has been described that the connecting spring 211 is combined with two adjacent main body springs 201, but the tire 1 does not necessarily have to have the connecting spring 211. For example, the tire 1 may have a connecting member 220 having two through holes 220a as shown in FIG. 12, and the connecting member 220 may connect two adjacent main body springs 201. .. The two through holes 220a of the connecting member 220 are large enough to allow the main body spring 201 to pass through. In this case, one main body spring 201 is passed through one of the two through holes 220a of the connecting member 220, and one main body spring 201 adjacent to the one main body spring 201 is passed through the other. As shown in FIG. 13, by passing the connecting members 220 through the plurality of locations of the main body spring 201, the two adjacent main body springs 201 are separated by the connecting members 220 at the plurality of locations separated in the tire width direction. Can be connected. In FIG. 13, a part of the connecting member 220 connecting the two main body springs 201 is shown as a cross section so that the state of penetration of the main body spring 201 through the through hole 220a can be seen. In this way, the tire 1 can also be configured by using the connecting member 220 instead of the connecting spring 211.

Although the present disclosure has been described based on the drawings and examples, it should be noted that those skilled in the art can easily make various modifications and modifications based on the present disclosure. Therefore, it should be noted that these modifications and modifications are included in the scope of the present invention. For example, the functions and the like included in each component can be rearranged so as not to be logically inconsistent, and a plurality of components can be combined or divided into one.

1: Tire, 10: Wheel part, 20: Ground deformation part, 101: First rim member, 102: Second rim member, 103: Connection member, 104: Support member, 105: Engagement receiving part, 106: Bolt, 107: Bolt hole, 201: Body spring, 202, 212: Elastic deformation part, 203: Locking part, 203a: Straight part, 203b: Bending part, 203c: Ring part, 203d: Through hole, 211: Connecting spring, 213 : Restriction part, 220: Connecting member, 220a: Through hole, A: Shaft

Claims (7)

The said so as to regulate the relative displacement between the plurality of rim members arranged at different positions on the same axis, the plurality of main body springs connecting each of the plurality of rim members, and the plurality of main body springs. It is composed of multiple connecting springs connected to the main body spring.
It has a limiting portion that limits the displacement of the connecting spring with respect to the body spring.
At least one of both ends of the connecting spring is not fixed to the plurality of rim members.
tire. The connecting spring has an elastically deformed portion and the limiting portion.
The limiting portion is provided at one end of the elastically deformed portion.
The tire according to claim 1. The tire according to claim 2, wherein the elastically deformed portion and the limiting portion are formed of an integral member. The tire according to claim 2 or 3, wherein the limiting portion has a portion formed in a ring shape. The tire according to claim 4, further comprising a wire passing through the ring-shaped portion of the limiting portion of the plurality of connecting springs. The tire according to any one of claims 2 to 5, wherein the elastically deformed portion extends over the entire width direction of the tire. The tire according to claim 1, wherein the limiting portion is composed of an independent member different from the connecting spring.