JPS6223281Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a flat rubber tire for running on wetlands, and is used for running devices such as agricultural machinery, such as binders.

(Prior art) As a tire used for a traveling device such as a binder, lugs are provided on the outer surface (tread portion) of the tire and are arranged at appropriate intervals. , Japanese Utility Model Publication No. 52-38801 provides ribs that are perpendicular to the rotational direction of the tire and are continuous over the tread, shoulder, and sidewall parts, and have a thin part that can be elastically deformed between each rib. It is proposed in

(Problems to be Solved by the Invention) Although the tire disclosed in the above-mentioned publication has some usefulness, it has the following problems.

In other words, the lug of the tread part is a parallel lug that extends to the full width of the tread, and since ribs are provided on the inner circumference corresponding to this lug across the tread part, shoulder part, and sidewall part, the lug The parts were extremely thick and hard, and were prone to violent vibrations when driven on the road.

In addition, in the circumferential direction of the tire, thick sections formed by the lugs and ribs and thin sections between the ribs are alternately formed over the entire width of the tread section.
During work in wet fields, the lugs dig into the soil and the ground contact area is not flat, causing the machine (binder) to vibrate up and down. Even if the lugs and ribs form a thick part, the tire tread part may not be as sharp when touching the ground. There is a risk of radially inward deformation in the central portion, and if this deformation occurs, the traction force provided by the lugs may be impaired.

The present invention improves stability and steering performance by locally reinforcing the parts corresponding to each lug in the shoulder part formed between the tread part and the sidewall part, which have lugs in a staggered arrangement, and the central part of the tread part. The object of the present invention is to provide a tire that is smooth and at the same time has the effect of shedding dirt from areas other than the reinforced portion.

(Means for Solving the Problems) The technical means taken by the present invention to achieve the above object are characterized by the tread portion 2 having the lugs 3 arranged in a staggered manner and the paired sidewall. A flat rubber tire for running on wetlands, which has a shoulder part 5 between the parts 1, is elastically deformed from a flat to an extremely flat cross-sectional shape, is in a ground contact position, and is elastically restored to the flat state after contact with the ground. The base end 3A is on the shoulder part 5, the free end 3B is on the center part in the width direction of the tread part 2, and they are arranged in a staggered manner. It has a shape-retaining rib 5a that protrudes inward to strengthen the lug base end 3A, and has a central thick wall part 6 that protrudes radially inward on the inner circumferential wall at the center in the width direction of the tread portion 2. Between the lugs 3 and the central thick wall portion 6 in the tire circumferential direction
This tread portion 2 is surrounded by
It has an expanding/contracting part 4 which is located on the outer circumferential side of the outer surface of the main body and has a thin wall and is elastically deformed inward and outward in the radial direction.

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

FIG. 1 shows a tire 10 mounted on a binder or the like.
, between the tread portion 2 having the lugs 3 arranged in a staggered manner and the paired sidewall portion 1,
It has a shoulder part 5 and a side wall part 1.
It undergoes large elastic deformation under the load of the binder, and as it travels, as shown in Figure 1, the flat object becomes extremely flat when it touches the ground, and its wall thickness becomes t to form a flat surface similar to a crawler type. has been done.

Therefore, the present rubber tire 10 is used with the bead portion attached to the tire wheel 11 shown in FIG. 1 at zero or extremely low internal pressure.

The tread portion 2 has a considerably wider width than the sidewall portion 1, and is thus generally an annular tire with a flat cross section as shown in FIG.

The base ends 3A of the lugs 3 are located on the shoulder portion 5, and the free ends 3B are located on the widthwise center of the tread portion 2, and are arranged in a staggered manner as shown in FIGS. 4 and 5. It has a sharp peak shape (trapezoid) that is easy to bite into and can withstand driving.

The inner circumferential wall of the tread portion 2 at the center in the width direction has a central thick wall portion 6 that projects radially inward, and this central thick wall portion 6 has a trapezoidal cross section as shown in FIG. It is continuous in the tire circumferential direction, and the free end 3B of each lug 3 is reinforced here to increase the rigidity of the lug 3.

Between the lugs 3 and the central thick part 6 in the tire circumferential direction
In the tread portion 2 surrounded by
Since the lugs 3 are arranged in a staggered manner, the expanding and contracting parts 4 are also arranged in a staggered manner.

This expanding/contracting part 4 is connected to the tread part 2 as shown in FIG.
It is located on the outer circumferential side of the outer surface of the base plate, and when it comes into contact with the ground as shown in FIG. 1, the expansion/contraction portion 4 in the non-grounded part bulges out as shown in FIG. There is.

The wall thickness of the expansion/contraction section 4 is the wall thickness t of the sidewall section 1.
Only the inner circumferential wall of the shoulder portion 5 corresponding to the lug base end 3A has a shape-retaining rib 5a that protrudes in the radial direction. The wall thickness T is 2t.

(Effect of the invention) According to the invention, the base ends 3A of the lugs 3 of the tread portion 2 are located on the shoulder portion 5, and the free ends 3B are located on the center portion of the tread portion 2 in the width direction, and are arranged in a staggered manner. Because of this, the lug pitch is reduced and vibrations can be suppressed, and even if the lug pitch is reduced, soil removal performance on the free end 3B side can be improved.

Furthermore, only the inner circumferential wall of the shoulder portion 5 corresponding to the lug 3 has a shape-retaining rib 5a that protrudes in the radial direction and strengthens the lug base end 3A, and the inner circumferential wall at the widthwise center of the tread portion 2 has a Since the has a central thick wall portion 6 that protrudes in the radial direction, a reinforcing effect occurs between the base end 3A and the free end 3B of the lug 3, which suppresses deformation of the lug 3 and improves steering stability. It can improve steering performance and steering performance.

In addition, the central thick wall portion 6 at the center of the width direction of the tread portion 2 produces a beam effect that prevents the center portion of the tread portion 2 from bending in the radial direction when touching the ground, thereby suppressing the deformation of the lug 3. It can exert sufficient traction power even in wet fields.

Further, in the tread portion 2 surrounded by the lugs 3 and the central thick wall portion 6 in the circumferential direction of the tire, there is an expansion/contraction section that is located on the outer circumferential side of the outer surface of the tread portion 2 and is made thinner and is elastically deformed inward and outward in the radial direction. When the expanding/contracting part 4 comes into contact with the ground, it contracts in the radial direction and grabs mud, while the non-grounded part swells due to an increase in internal pressure and peels off the attached soil, and this process is repeated alternately. By returning the rice, wet field performance can be greatly improved.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the tire running position, and FIG. 2 is a cross-sectional view showing an example of the ribbed tire of this invention.
3 is a sectional view taken along the line AA in FIG. 2, FIG. 4 is a perspective sectional view thereof, and FIG. 5 is a developed plan view showing an example of a tread pattern. 1...Side wall section, 2...Tread section,
3... Lug, 3A... Lug base end, 3B... Lug free end, 4... Expansion/contraction part, 5... Shoulder part, 5a...
...Shape-retaining ribs.

Claims (1)

[Claims for Utility Model Registration] A shoulder portion 5 is provided between a tread portion 2 having lugs 3 arranged in a staggered manner and a pair of sidewall portions 1, and the shoulder portion 5 is elastically deformed from a flat to an extremely flat cross-sectional shape. In the flat type rubber tire for wetland running, which is in a ground contact position and elastically restored to the flat state after touching the ground, the base end 3A of the lug 3 is on the shoulder part 5, and the free end 3B is above the widthwise center part of the tread part 2. They are arranged in a staggered manner, and only the inner circumferential wall of the shoulder portion 5 corresponding to the lug 3 has shape-retaining ribs 5a that protrude radially inward to strengthen the lug base end 3A, and the tread portion 2 The inner circumferential wall at the center in the width direction has a central thick wall portion 6 that projects radially inward, and the center thick wall portion 6 is located between the lugs 3 in the circumferential direction of the tire.
This tread portion 2 is surrounded by
1. A flat rubber tire for running on wetlands, characterized by having an expanding/contracting part 4 which is located on the outer peripheral side of the outer surface of the tire and has a thin wall and is elastically deformed inward and outward in the radial direction.