KR102684346B1 - Airless tire with changable spoke - Google Patents

Abstract

The present invention discloses a non-pneumatic tire with replaceable spokes.
A non-pneumatic tire with replaceable spokes according to the present invention includes a tread portion in contact with the road surface, an outer band portion disposed inside the tread portion, an inner band portion disposed inside the outer band portion, and the outer band portion and the inner band portion. It includes a spoke portion interposed between the spoke portions, and the spoke portion further includes replacement spokes that are detachable to adjust tire rigidity. Accordingly, the spokes that serve as the sidewall of the non-pneumatic tire can be divided into fixed and replaceable spokes. By dividing by , the sidewall rigidity can be easily adjusted through replaceable spokes.

Description

Airless tire with changeable spokes

The present invention relates to a non-pneumatic tire equipped with replaceable spokes. More specifically, the spokes that serve as the sidewall of a non-pneumatic tire are divided into fixed type and replaceable type, so that the sidewall rigidity can be easily adjusted through replaceable spokes. It relates to a non-pneumatic tire with replaceable spokes.

Tires currently used in vehicles are largely classified into bias and radial tires, and among these, radial tires are generally used in passenger cars.

These radial tires are mounted on a vehicle wheel connected to the vehicle's axle and are used by injecting a certain amount of air pressure. If the air pressure is insufficient, it becomes difficult to support the load of the vehicle, resulting in an unstable ride quality and vulnerability to shock absorption.

For this reason, pneumatic radial tires require periodic air pressure checks.

However, recently, non-pneumatic tires that support the vehicle load are being developed by moving away from the method of adding air pressure and replacing the sidewall with a spoke structure made of high-rigidity synthetic rubber material.

Non-pneumatic tires eliminate the risk of low air pressure, so there is no loss due to tire maintenance, and the overall weight of the vehicle can be reduced by eliminating the need for a spare tire in consideration of tire destruction.

These non-pneumatic tires have sidewalls made up of multiple spokes compared to conventional pneumatic tires, so handling and braking performance are greatly affected by the shape and material of the spokes.

However, since the multiple spoke shapes provided in non-pneumatic tires are injected in a fixed type like existing pneumatic tires, there is a limitation in that it is impossible to adjust the sidewall rigidity according to consumer needs.

Republic of Korea Patent Publication No. 2021-0079622 (publication date: June 30, 2021)

Therefore, the technical problem to be solved by the present invention is to classify the spokes that serve as the sidewall of non-pneumatic tires into fixed and replaceable types, thereby creating a non-pneumatic tire equipped with replaceable spokes that can easily adjust the sidewall rigidity through replaceable spokes. Tires are provided.

In order to solve the above-described technical problem, the present invention provides a tread portion in contact with the road surface, an outer band portion disposed inside the tread portion, an inner band portion disposed inside the outer band portion, and a tread portion between the outer band portion and the inner band portion. A non-pneumatic tire with replaceable spokes is provided, including an interposed spoke portion, wherein the spoke portion further includes replacement spokes that are detachable for adjusting tire rigidity.

According to another embodiment of the present invention, the replacement spokes may be arranged at regular intervals between the fixed spokes of the spoke portion.

According to another embodiment of the present invention, the replacement spoke may be included in a replacement module and be attached and detached at once.

According to another embodiment of the present invention, the replacement module may include replacement spokes fixed to the fixed body at regular intervals.

According to the non-pneumatic tire equipped with replaceable spokes according to the present invention, the spokes that serve as the sidewall of the non-pneumatic tire are divided into fixed type and replaceable type, thereby achieving the effect of easily adjusting the sidewall rigidity through replaceable spokes. Demonstrate.

1 is a perspective view of a tire according to the present invention, showing the tread portion, outer band portion, spoke portion, and inner band portion,
Figure 2 is a view showing the replacement spoke removed from Figure 1;
Figure 3 is a view showing the shape of the tire in Figure 2 as seen from the side;
Figure 4 is a perspective view showing a replacement spoke according to the present invention;
Figure 5 is a perspective view of the fixed slot according to the present invention;
Figure 6 is a diagram showing the shape in which the replacement spoke of the present invention enters or is removed from the fixed slot.

Hereinafter, the present invention will be described in detail.

However, it should be noted that the technical terms used in the present invention are only used to describe specific embodiments and are not intended to limit the present invention.

In addition, the technical terms used in the present invention, unless specifically defined in a different sense in the present invention, should be interpreted as meanings generally understood by those skilled in the art in the technical field to which the present invention pertains, and are not overly comprehensive. It should not be construed in a literal or excessively reduced sense, and if the technical term used in the present invention is an incorrect technical term that does not accurately express the idea of the present invention, it should be used as a technical term that can be correctly understood by a person skilled in the art. It should be understood as a replacement, and general terms used in the present invention should be interpreted as defined in the dictionary or according to the context, and should not be interpreted in an excessively reduced sense, and the singular terms used in the present invention The expression includes plural expressions unless the context clearly indicates otherwise, and in the present invention, terms such as 'consists' or 'comprises' necessarily include all of the various components or steps described in the invention. It should not be construed that some of the components or steps may not be included, or that additional components or steps may be included, and in describing the present invention, related known technologies should be used. If it is determined that a detailed description may obscure the gist of the present invention, the detailed description will be omitted.

Figure 1 is a perspective view of a tire according to the present invention, showing the tread part, outer band part, spoke part, and inner band part, Figure 2 is a view showing the replacement spokes removed from Figure 1, and Figure 3 is a side view of the tire of Figure 2. It is a view showing the shape as seen from, Figure 4 is a perspective view showing the replacement spoke according to the present invention, Figure 5 is a perspective view showing the fixing slot according to the present invention, and Figure 6 is a view showing the replacement spoke according to the present invention. This is a drawing showing how a spoke enters or removes a fixed slot. Please refer to this.

The non-pneumatic tire 100 with replaceable spokes according to the present invention includes a tread portion 110 in contact with the road surface, an outer band portion 120 disposed inside the tread portion, and an inner band portion disposed inside the outer band portion ( 130) and a spoke portion 140 interposed between the outer band portion and the inner band portion, and the spoke portion 140 further includes replacement spokes 200 that are detachable to adjust tire rigidity. .

Here, the dread portion 110 is the outermost surface of the tire that is in direct contact with the road surface, and may generally be provided with elasticity to absorb or alleviate shock caused by external forces that the vehicle receives while driving on the road.

In addition, the outer band portion 120 is disposed on the inside of the tread portion and serves to uniformly distribute the load transmitted from the vehicle to the tread portion, and receives and receives the vehicle load transmitted through the spokes or shock caused by external force through the spokes. can do.

Here, a shear band may be further included between the outer band portion and the tread portion, that is, the shear band may be disposed along the circumferential direction of the outer band portion in a shape corresponding to the outer band portion on the outer peripheral surface of the outer band portion. there is.

This shear band can play the role of primarily relieving the initial stress acting on the non-pneumatic tire and dispersing the stress to the upper part of the non-pneumatic tire, and can be manufactured using a steel belt layer or a composite material containing carbon fiber. You can.

In addition, the inner band portion 130 is disposed on the inside of the outer band portion and fastened to the vehicle wheel. The rim of the vehicle wheel can be coupled to the inner peripheral surface of the inner band portion, so the shape of the inner band portion is similar to the rim shape of the vehicle wheel. It can be equipped to respond.

Meanwhile, the outer band portion 120 may be spaced a predetermined distance from the inner band portion 130 and may be provided in a shape that surrounds the inner band portion so that the inner peripheral surface of the outer band portion and the outer peripheral surface of the inner band portion face each other.

In addition, the spoke portion 140 connects the outer band portion 120 and the inner band portion 130 to transmit external force transmitted through the vehicle load or the road surface, and this spoke portion is detachable to adjust tire rigidity. Replacement spokes 200 may be further included.

The replacement spokes 200 may be arranged at regular intervals between the fixed spokes 142 of the spoke portion. The fixed spokes 142 are arranged at a certain number (n) and at certain intervals (P) to determine the rigidity of the tire. The rigidity can be increased by arranging the replacement spokes 200 at the insertion interval (P') in between, and the insertion interval needs to be constant in order to uniformly distribute the vehicle load or external force throughout the tire. If replacement spokes are placed at irregular intervals, force may not be distributed smoothly, causing stress in specific parts of the tire, which may deteriorate durability and reduce the drivability or stability of the vehicle.

The number (n) of the fixed spokes 142 can be determined in various ways depending on the spoke material or the purpose and specifications of the tire, and the spacing (P) of the fixed spokes 142 is used to ensure uniform distribution of the load or external force applied to the tire. For this purpose, it is desirable to maintain a certain distance. For example, the gap between fixed spokes adjacent to the center of the tire (C, i.e., the position corresponding to the center of the rotation axis of the vehicle wheel) is the circumferential distance forming a certain angle (β). P) can be set.

This can be expressed as Equation 1 below.

<Equation 1>

360°= n × β

(n is the number of fixed spokes, β is the angle formed by adjacent fixed spokes)

On the other hand, the replacement spokes 200 are also arranged at a certain number (n') and at certain intervals (P'), so that various stiffnesses can be adjusted according to the purpose and specifications of the tire.

The number (n') of the replacement spokes (200) can be determined in various ways depending on the spoke material or the purpose and specifications of the tire, and the spacing (P') of the replacement spokes (200) is determined by uniformity of the load or external force applied to the tire. It is desirable to maintain a certain distance for uniform dispersion. For example, the spacing between adjacent replacement spokes at the center of the tire (C, i.e., the position corresponding to the center of the rotation axis of the vehicle wheel) is located along the circumference forming a certain angle (α). It can be determined by distance (P').

This can be expressed as Equation 2 below.

<Equation 2>

360°=n' × α

(n' is the number of replacement spokes, α is the angle formed by adjacent replacement spokes)

If the number of fixed spokes (n) is greater than the number of replacement spokes (n') (n>n'), the spacing (P') of the replacement spokes must be wider than the spacing (P) of the fixed spokes. (P<P')

On the other hand, if the number of replacement spokes (n') is greater than the number of fixed spokes (n) (n<n'), m replacement spokes are placed between adjacent fixed spokes (m: Adjacent fixed spokes among replacement spokes) number placed between spokes), the spacing (p') of m replacement spokes must be narrower than the spacing (P) of fixed spokes. (P>p')

The relationship between the number of replacement spokes (m) disposed between adjacent fixed spokes, the number of fixed spokes (n), and the number of replacement spokes (n') is as follows.

<Equation 3>

n'=m×n

The spacing (p') between the m replacement spokes arranged between the fixed spokes can be expressed as the spacing (P) between the fixed spokes as follows.

<Equation 4>

p'=P/(m+1)

In addition, the distance (P'') between the center of the replacement spoke bundle disposed between the fixed spokes and the center of the next replacement spoke bundle needs to be the same as the distance between the fixed spokes (P).

In addition, when the number (n) of the fixed spokes 142 and the number (n') of replacement spokes 200 are the same, the angles (β, α) between them also need to be the same, which means that the sidewall is uniform on the circumference. This is to suppress uneven riding comfort and uneven wear by maintaining rigidity and maintaining the contact area and pressure of the tread portion 110 and the road surface uniformly around the circumference.

In addition, when the replacement spoke 200 is disposed between the fixed spokes 142, it is arranged at a circumferential position corresponding to half (β/2) of the angle between the fixed spokes 142, that is, at the midpoint of the fixed spokes. This is desirable, and this is also to maintain uniform sidewall rigidity along the circumference and suppress uneven ride comfort and uneven wear.

On the other hand, since the replacement spokes 200 are provided in multiple numbers (n'), there may be a problem of lowering work efficiency in terms of time when attaching and detaching them one by one, so a replacement module that can attach and detach a plurality of replacement spokes at once is installed. It can be provided.

The replacement module 300 is arranged at regular intervals (P') to correspond to the insertion and removal position of the spoke portion 140 to insert or remove the replacement spoke 200 at once from the side of the tire 100 according to the present invention. It includes a replacement spoke 200 and a fixing body 310 that secures the end of the replacement spoke.

That is, the replacement spokes 200 fixed to the fixing body 310 at regular intervals can be fastened by sliding them into the fixing slots 400 provided at the insertion and removal positions of the spoke portion.

The fixing slot 400 has a sliding groove 410 of a shape corresponding to the sliding protrusion 210 of the replacement spoke, and is provided on the inside of the outer band portion 120 and the outside of the inner band portion 130, so that the replacement spoke The rigidity of the tire can be increased by inserting (200), and conversely, the rigidity can be reduced by removing it.

Here, the sliding protrusion 210 must be easy to slide and at the same time it is desirable to remain stably fastened to the fixing slot 400 even in extreme environments caused by vehicle vibration, so the replacement spoke 200 By providing an extension portion 210 extending in a direction opposite to the end portion 220, the risk of separation can be fundamentally prevented.

In addition, since the sliding protrusion 210 needs to be fixed after sliding and inserting into the sliding groove 410, a locking portion 420 is installed in the sliding groove 410 corresponding to the end where the sliding protrusion 210 enters. It is possible to prevent the progression of the sliding protrusion.

Furthermore, during vibration caused by vehicle operation, the sliding groove 410 corresponding to the end where the sliding projection 210 enters is provided with a locking portion 420 to prevent the sliding projection 210 from being removed arbitrarily. To this end, fixing holes 420' and 220' are provided on the locking part 420 and the sliding protrusion 210 at a position corresponding to the locking part, and the fixing holes are blocked with a fastening means such as a bolt to prevent random movement of the sliding protrusion. can do.

Non-pneumatic tire 100, tread part 110, outer band part 120, inner band part 130, spoke part 140, fixed spoke 142, replacement spoke 200, replacement module 300, fixed slot 400.

Claims (4)

delete A tread portion in contact with the road surface;
An outer band portion disposed inside the tread portion;
an inner band portion disposed inside the outer band portion; and
It includes a spoke portion interposed between the outer band portion and the inner band portion,
The spoke unit further includes replacement spokes that are detachable to adjust tire rigidity,
A non-pneumatic tire with replaceable spokes, wherein the replacement spokes are arranged at regular intervals between fixed spokes of the spoke portion.
According to claim 2,
A non-pneumatic tire with replaceable spokes, wherein the replacement spokes are included in a replacement module and can be attached and detached at once.
According to claim 3,
The replacement module is a non-pneumatic tire with replaceable spokes, characterized in that it includes replacement spokes fixed to a fixed body at regular intervals.