JPS6348728B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a track for snow-covered tires for tubeless tires.

(Prior Art) Although so-called snowmobiles are known for driving on snowy roads, they are used exclusively for snowy roads and are impossible or difficult to run on general roads, lack versatility, and are expensive. In addition, for so-called large vehicles such as regular passenger cars and trucks, there are snow tires with a so-called block pattern tread pattern and a large groove depth, but this function becomes less effective when the amount of snow becomes large. If it is severely damaged or frozen, it will no longer be possible to drive it, so it is common practice to install spikes or wrap a chain around it.

(Problem to be solved by the invention) However, spikes, chains, etc. are extremely troublesome to attach and remove from tires, and
If the amount of snowfall was large, it would be virtually impossible to drive. Furthermore, although the wheel disclosed in Japanese Utility Model Application Publication No. 55-109005 is made of a band-like body having a plurality of lugs made of an elastic material and detachably attached to the outer periphery of the wheel, in the attached state, it does not connect to the wheel. In between, slippage occurred, making it virtually impossible to drive, and furthermore, it was impossible to drive on the snowy road by compacting it.

The present invention has been devised in view of the above-mentioned circumstances, and it is possible to run stably and smoothly regardless of the amount of snowfall or the quality of the snow, and it is extremely easy to attach and detach from the tire. To provide a crawler track for snowy roads for tubeless tires that can be firmly mounted under stress without relative slippage.

In particular, the track for snowy roads of the present invention is beneficial if used for three-wheeled or four-wheeled ultra-small buggy vehicles with a small load capacity and a weight of about 200 to 300 kg, but even if the vehicle type is other passenger vehicles. good.

(Means for Achieving the Object) In order to achieve the above object, the present invention provides a crawler track for snowy roads that can be removably installed around the tread of a tubeless tire whose entire body including the tire body is made of an elastic material. A crawler track main body made of an elastic material has a band width equal to the length between the tire shoulders, and snow compaction lugs extending in the width direction of the band and integrally arranged with the main body at predetermined intervals in the longitudinal direction of the band. In addition, each of the lugs is erected at an angle with respect to the main body in a direction opposite to the tire rotation direction, and furthermore, a lug support portion supporting each lug is integrally formed to connect the side of each lug in the opposite tire rotation direction to the main body. A wing body extending on the same plane as the lug slope portion and the lug top is connected to the axial outer end of each lug, and a support portion for supporting the wing body is connected to the main body, and further The crawler belt is characterized by having an engaging portion on the anti-lug surface of the crawler main body provided around the tire tread portion to prevent relative movement with the tire in the tire rotation direction.

(Embodiments and Effects) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Referring to FIGS. 1 to 5, an assembled wheel is shown in which a low-pressure tubeless tire A is equipped with a crawler track B according to the present invention.

The tubeless tire A has a tire body 1 made entirely of flexible elastic rubber or other similar materials.
The body 1 is removably attached to a rim 2 having an axle attachment part 3 in the center.

The tire body 1 is composed of a pair of left and right bead portions 4, each sidewall portion 5 rising from each bead portion 4, and a tread portion 7 that connects each sidewall portion 5 via a shoulder 6. In this example, the tread portion 7 A protrusion 8 in a block pattern is formed on the tread portion of the outer circumferential surface.

Each bead portion 4 of the tire body 1 is fitted into a rim bead seat 9 and a rim flange 10 of a rim 2, thereby forming a substantially tubeless hollow tire.

In order to assemble the body 1 and the rim 2, each bead portion 4 can be sufficiently elastically deformed and has a structure that ensures sufficient airtightness after assembly.

That is, as particularly shown in FIGS. 8 and 9, a protruding portion 11 is integrally formed at the tip of each bead portion 4 and located inside the sidewall portion 5.
A ring-shaped locking portion 12 is recessed into the bulging portion 11 toward the inner diameter of the tire, and a rigid ring 13 such as a steel wire is engaged and fitted into the locking portion 12.

Therefore, if air or a pressurized medium is directly injected into the body 1 through a valve device (not shown) provided on the rim, the bulges 11 will flow and deform outward due to the internal pressure, and the rim bead seat 9 and the rigid ring The body 13 is wedge-shaped and is tightly and firmly assembled here.

In addition, although the illustration shows one locking portion 12 and one rigid ring body 13, they may be arranged side by side in the axial direction.

Also, the tubeless tire A in Figs. 8 and 9
The code 14 is embedded in the periphery, but the presence or absence of the code 14 is acceptable, and the code 1
4 may extend between the beads, or may not extend as shown in the figure, and the structure of the bead portion may be a known structure other than that shown in the figure.

The crawler belt B according to the present invention, which is detachably attached to the tread portion of the tire A, is constructed as follows.

The crawler track body 15 is made of an elastic material, that is, a flexible material such as flexible rubber or other elastomer.
As shown in the figure, the band width W2 of the main body 15 is the length between the tire shoulders, and its relationship with the tire width W1 is
W2/W1=0.8 to 1.7.

Snow compaction lugs 16 are integrally formed on the crawler track main body 15, and the lugs 16 extend in the belt width direction and are arranged in rows at predetermined intervals in the belt longitudinal direction of the main body 15. It is erected at an angle to the opposite direction.

In the embodiment shown in FIGS. 7 to 10, the crawler main body 15 has an extension blocking body 17 embedded in the main body 15,
The embodiments shown in FIGS. 3 and 4 do not have an extension blocker, and in any case, the connection can be freely moved in and out by inserting and removing connecting pins 18 on both longitudinal end surfaces as shown in FIG. When configuring part 19,
As shown in FIG. 12, the crawler belt main body 15 itself may be an endless ring disposed around the tire tread.
That is, when the connecting portion 19 is provided, the crawler track main body 15 is provided around the tire A assembled on the rim, the connecting portion 19 is fixed with a pin 18, and the eighth As shown in the figure, by injecting air or the like, the main body 15 is installed around the tread surface through expansion and deformation of the tire A.
When the crawler track main body 15 is an endless ring, it is assembled by injecting air or the like in the same way, and in the installed state, the tire A is uniformly expanded and deformed as a whole, and the main body 15 is expanded radially outward. The mounted state is maintained or maintained, and especially when the expansion prevention body 17 is embedded in the main body 15, the main body 15 and the tire A are
It is possible to prevent deviation in the circumferential direction.

Furthermore, in any of the embodiments, by providing an engaging portion 20 that fits with the protrusion 8 of the tire A on the inner surface of the crawler main body 15, that is, on the anti-lug surface, the circumference of the main body 15 and the tire A after the tire and the track are set. Directional misalignment can be prevented, and therefore, the extension blocking body 17 can be omitted in this case. However, it is most desirable to provide both the extension blocking body 17 and the engaging portion 20.

When the crawler track main body 15 is attached to the tire A, in this embodiment, eight lugs 16 are provided at equal intervals in the circumferential direction on the radial line of the tire A, and each lug 16 is erected at an angle in the opposite direction to the tire rotation direction. At the same time, each lug 16 is connected to the main body 15 on the side opposite to the tire rotation direction by a lug support portion 21.

In each of the embodiments shown in FIGS. 1 to 11, the tops of the lugs 16 are located on the same circumference and cooperate with the lugs support portions 21 to form so-called hollow triangular lugs. In the embodiment shown in FIG. 11, triangular support portions 21 are provided at intervals in the band width direction on the back surface of a roughly L-shaped lug 16 consisting of a top surface 16A and an inclined surface 16B. Lug top surface 16
A is the tire outer diameter R as shown by the symbol R in Fig. 10.
It is said to be a curved surface of 1R to 2R.

Further, as shown in FIG. 10, the inclined surface 16 of the lug 16
B is that the angle θ1 with respect to the radiation O-O is the support part 2
In this embodiment, θ1 is set to 15° to 30° (preferably 25°), which is equal to or larger than the same angle θ2 of 1.
The minimum angle of θ2 is set to 5 degrees, and the sloped surface 16B of the lug 16 increases the tread surface, thereby improving buoyancy. It is constructed to prevent excessive deformation.

In addition, in order to better achieve this function, as shown in FIG. 10, the relationship among the wall thickness t1 of the inclined surface 16B, the wall thickness t2 of the support portion 21, and the wall thickness t3 of the main body 15 is t2≧t1≧.
It is said to be t3.

In addition, in the embodiment, when the height of each lug 16 is H1 and the mounting height of the main body 15 is H2, H1/H2 is 1.3 or more to 2.0 in consideration of the buoyancy on snow and driving force.
The relationship with the tire width W1, that is, H2/W1, is 0.63 and 0.41, and the pitch of the lug 16 is greater than 2 (H1 - H2), and the number of lugs in the snow. It is desirable that the number is at most 4, preferably 3.

Reference numeral 22 denotes a wing body, which is integrally connected to the outer end of each lug 16 in the axial direction on the same plane as the slope portion (slanted surface 16B) and the top portion 16A, and the wing body 22 and the main body 15 are on opposite sides in the rotational direction. The crawler belt body 15 is connected to the tire A by a support portion 23, and has a constriction portion 24 and a recess 25.

In the first embodiment, as shown in FIG. 6, the support portion 23 has a wall surface 26 at the outer end of the lug that extends outward in the tire rotation axis direction toward the wing body 22 as a so-called inclined vertical surface portion, and is curved. The structure is configured to prevent excessive deformation of the wing body 22 and promote elastic recovery after deformation in cooperation with the support portion including the portion 23A.Furthermore, in the embodiment, the back surface of the wing body 22 is provided with a so-called L-shape. It has ribs 27.

Here, the wing body 22 is driven only by the inclined surface 16B, assisting or increasing the instability of the flying force, and by forming the recess 25, the wing body 22 itself does not become a significant obstacle to turning during cornering. .

In addition to the above, the crawler track B of the present invention has a wing body 22 which serves as a compaction or buoyancy promoting part, as shown in FIG.
Alternatively, one or more auxiliary support ribs 29 may be provided on the outer or inner surface as shown in FIGS. 7 and 14.

Next, referring to FIG. 6, the operation of the snow-covered wheel in which the tire A is equipped with the crawler track B will be explained. In addition, tire internal pressure 0.2Kg/cm ² and static ground pressure 0.10Kg/cm ² are desirable.
It is desirable to set it to 0.05Kg/ ^cm2 .

If the vehicle rotates in the direction of the arrow in FIG.
2 will hit the snow surface S, but the inside of the slope 16B is hollow or plate-shaped, and the wing body 22 has a recess 25 and can be elastically deformed. Since the inclined surface 16B is supported by the support part 21, and the wing body 22 is supported by the support part 23 and the wall surface 26, the reaction force hitting the snow surface S generates a large buoyant force and also lifts the snow layer. By providing the wing body 22, it is possible to form a large tread surface without increasing the height of the slope 16B, that is, the height of the lug, and as a result, even when driving on general roads, there is no excessive vibration. This makes it possible to drive.

In this way, the snow layer is successively compacted, and when the lug 16 separates from the snow surface S, it is elastically restored to its previous position by the lug support portions 21 and 23.

Furthermore, when the running speed increases, that is, when the number of rotations of the tires increases, the slope 16B compacts the snow layer at the front and rear of the snow surface S, and exhibits a floating running mode to ensure running. And also,
Experiments have shown that even when the amount of snow has increased and, for example, the axle has sunk almost to the top of the snow surface S, the vehicle is still able to travel.

Also, when the vehicle is turning while driving, the top portions 16A of the lugs 16 are arc-shaped and the wing bodies 22
Since it is attached to tire shoulder 6,
The wing body 22 is elastically deformed during turning without becoming an obstacle to turning, and the turning can be performed extremely safely and easily.

Furthermore, since the wing body 22 substantially reduces the lug height, it is possible to ensure running without excessive vibration even when running on general roads.

(Effect of the invention) The present invention is as described above, and has the following advantages.

Since the main body 15 of the snow track track B is made of an elastic material,
Installation on tire A becomes extremely easy,
Moreover, it can be easily removed by releasing the pressure inside the tire.

In other words, when installing track B on tire A, tire A
By injecting internal pressure into the tire, the tire A bulges and deforms, thereby preventing relative displacement with the crawler track B. In particular, since the tire is installed by injecting internal pressure into the tire, the entire tire can be installed uniformly, and the tire tread is smooth. The anti-lug surface that overlaps the surface portion has an engaging portion 20 that prevents relative movement with the tire in the tire rotation direction, so even if it is installed around the tire A and runs on a snowy road, the tire A and the track will not move. There is no slip between B and, in particular,
Even when the vehicle is braked, there is no slip between the tires A and the tracks B, and they function in the same way as if the tires A and tracks B were integrated, allowing the vehicle to run not only on snowy roads but also on ordinary roads.

Further, the width of the main body 15 of the crawler track B is the same as the length between the tire shoulders, and the main body 15 has lugs 16 arranged in rows and a wing body 22 extending from the outer end of the lug. The buoyancy and compaction by the wing body 22 can be improved, and the compaction of snow on snowy roads can be ensured to ensure stable running.

Further, even if the wing body 22 is provided, the height of the lug 16 may be lowered, which has the advantage that vibrations during driving on a general road can be suppressed and cornering can be performed smoothly and easily.

[Brief explanation of the drawing]

Figure 1 is a front view of the snow-covered track of the present invention attached to a tire, Figure 2 is a rear view of the same, and Figure 3 is the same figure as shown in Figure 1
An enlarged sectional view, FIG. 4 is an enlarged sectional view taken along YY in FIG. 1,
Fig. 5 is a partially enlarged plan view, Fig. 6 is a front view showing an example of a running situation, Fig. 7 is a front view of another embodiment, and Figs. 8 and 9 are enlarged cross sections showing before and after installation. 10 is an explanatory perspective view of the main parts, FIG. 11 is a front view of only the track of another embodiment, FIG. 12 is a perspective view showing only the lug portion, and FIGS. 13 and 14 are FIG. 7 is a partial plan view showing another embodiment. A... Tire, B... Track, 1... Body, 6
... Shoulder, 15 ... Track body, 16 ... Lug, 21, 23 ... Support part, 22 ... Wing body.

Claims (1)

[Claims] 1 A crawler track for snowy roads that can be removably installed around the tread of a tubeless tire whose entire body, including the tire body, is made of an elastic material, and whose main body is made of an elastic material and whose width is equal to the length between the tire shoulders. , snow compaction lugs extending in the width direction of the belt and arranged integrally with the main body at predetermined intervals in the longitudinal direction of the main body; The lug support part supporting each lug is integrally provided so as to connect the side of each lug in the direction opposite to the tire rotation direction with the main body, and the lug slope part and the lug top part are provided at the axially outer end of each lug. A wing body extending on the same plane as the wing body is connected to the main body, and a supporting part for supporting the wing body is connected to the main body, and further,
A crawler track for snowy roads for a tubeless tire, characterized in that the anti-lug surface of the track body provided around the tire tread part has an engaging part that prevents relative movement with the tire in the tire rotational direction.