JPH10272902A - Tires with lug segments - Google Patents

Abstract

(57) [Summary] [Problem] Adjacent lug segments come into contact with each other to generate heat, prevent wear and deterioration, and cause earth and sand to adhere between hollow portions (openings) of lug segments and adjacent lug segments. To prevent that. SOLUTION: In a tire provided with a lug segment, a lug segment 11 forms convex portions 11a at front and rear ends of a projection 11c in an outer peripheral direction of a rim 15, and
The lug segments 11 are arranged at a predetermined interval L1 such that adjacent lug segments 11 do not come into contact with each other at the time of grounding.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tire for a wheeled construction vehicle, and more particularly, to a structure of a large number of lug segments arranged in a circumferential direction of a rim.

[0002]

2. Description of the Related Art A conventional tire using lag seg cement for a construction vehicle will be described with reference to FIGS. FIG.
Is a lower traveling structure 1 on which tires 20 are rotatably arranged, and an upper revolving structure 2 on which a driver's cab 3 is mounted.
And work machine 4 consisting of boom, arm and bucket
Equipped. As shown in FIG. 10, rims 15 and 15 are connected to a drive device 10 such as a hydraulic motor. Lug segments 21 and 21 formed of an elastic material such as rubber are fixed to the rims 15 and 15 with bolts 20A.
FIG. 10 shows the structure of a double tire, but a single tire may be used.

[0003] As an example of the prior art of a tire having a lug segment, Japanese Patent Publication No. 5-507046 is filed. The contents of the application will be described with reference to Figs. Including a main body 73 (lug segment) configured to be elastically deformed under load and a tread provided on the main body 73 as shown in FIGS. 11 and 12, the tread is provided in a circumferential shape and It includes a plurality of ridges 75 between which a groove 78 is defined, each ridge 75 extending outwardly from a first central portion 77 and each from the central portion 77 toward one side of the body 73. A side portion 79 defining a V-structure, and wherein the first central portion 77 is adjacent to the V-structure in a direction spaced from an outer edge of the side portion 79. The protrusion 75 extends toward the V structure. The body 73 has an opening (hollow portion) 73a.

Japanese Patent Application Laid-Open No. 9-156309 has been filed as two examples of prior art tires provided with lug segments. The content of this application is a rubber elastic body segment mounted on the outer peripheral side of a wheel or an endless track belt, and a bottom surface portion mounted in contact with the wheel or the endless track band, and in a width direction of the wheel or the endless track band. A hollow portion is formed, a stopper portion rising from the bottom portion is formed in the hollow portion, and the inner surface and the stopper have a non-contact structure under a static load of the fuselage. Mounting segment. Further, in the above configuration, in a state where the rubber elastic body segment is mounted on a wheel or an endless track belt, a side surface portion of an adjacent rubber elastic body segment does not come into contact with the rubber elastic body segment. Is described.

Japanese Patent Application Laid-Open No. 9-207837 has been filed as a prior art example of a tire having a lug segment. The content of this application is a rubber elastic body segment mounted on the outer peripheral side of a wheel or an endless track band, and the segment has a hollow portion formed in the width direction of the wheel or the endless track band, and the hollow portion is grounded. An outer surface portion where a lug is formed on the side, a side surface portion and a bottom surface portion, and a stopper portion is formed in the hollow portion to rise from the bottom surface portion, and a gap between a top surface portion of the stopper and a hollow portion side inner surface of the segment outer surface portion. A rubber elastic body segment, which is wide in the front and rear direction of the vehicle and narrow in the center. Further, in the above configuration, in a state where the rubber elastic body segment is mounted on a wheel or an endless track belt, a side surface portion of an adjacent rubber elastic body segment does not come into contact with the rubber elastic body segment.
Is described.

Incidentally, in order to prevent the side portions of the adjacent rubber elastic segments from coming into contact with each other, it is conceivable to make the side portions of the rubber elastic segments concave. Sediment intruded into the recess on the side of the segment and adhered,
There is a new problem of falling while driving on public roads.

[0007]

However, FIG.
According to the technique described in Japanese Patent Publication No. 5-507046 shown in FIG. 12, a main body 73 configured to be elastically deformed is provided.
(Lug segment) Opening (hollow portion) 73a
13, the ends 73x and 73w of the adjacent main bodies 73 come into contact with each other and rub against each other due to the vertical load in the F1 direction and the horizontal load in the F2 direction when the main body 73 comes into contact with the ground as shown in FIG. I do. For this reason, when the vehicle travels at high speed, the wear and deterioration of the main body 73 (lug segment) are significantly impaired due to the heat generated by the main body 73 (lag segment).
(Lag segment) needs to be replaced.

Japanese Patent Application Laid-Open Nos. Hei 9-156309 and Hei 9-207837 disclose that when rubber elastic segments are mounted on wheels or endless tracks, the side surfaces of adjacent rubber elastic segments contact each other. It is described that the structure was not, but the gist of the present invention,
It does not disclose that the adjacent lug segments are arranged at a predetermined interval L1 such that adjacent lug segments do not come into contact with each other at the time of contact with the ground, and that the adjacent lug segments come into contact with each other at the time of overload such as sudden braking.

The present invention focuses on the above-mentioned problems of the prior art, and generates heat by contact between adjacent lug segments.
An object of the present invention is to provide a tire provided with a lug segment that is free from wear and deterioration and that prevents earth and sand from adhering to the lug segment.

[0010]

In order to achieve the above object, a first invention of a tire having a lug segment according to the present invention provides a hollow portion having a substantially U-shape or a substantially U-shape. In a tire provided with a lug segment provided with a plurality of lugs arranged so as to be adjacent to each other in the outer circumferential direction of the rim,
The lug segments are formed such that convex portions are formed at the front and rear ends of the protrusions in the outer circumferential direction of the rim, and are disposed at a predetermined interval L1 such that adjacent lug segments do not come into contact with each other when grounded. is there. According to the above configuration, since there is a predetermined interval L1 at which the adjacent lug segments do not come into contact with each other, the adjacent lug segments come into contact with each other and generate heat, so that wear and deterioration do not occur. In addition, since the end of the rug segment is formed in a convex portion, it is possible to prevent the adhesion of earth and sand between the end of the adjacent rug segment, so that the earth and sand may fall while traveling on a public road. The problem goes away.

According to a second aspect of the present invention, there is provided a tire including a plurality of lug segments provided with a plurality of lugs adjacent to each other in the outer peripheral direction of a rim by providing a projection having a substantially U-shaped or substantially U-shaped hollow portion. The lug segments are configured such that convex portions (11a) are formed at the front and rear ends of the protrusions in the outer peripheral direction of the rim, and that adjacent lug segments are in contact with each other when overloaded. . According to the above configuration, as shown in FIG. 1, adjacent lug segments come into contact with each other when suddenly starting, suddenly braking, or receiving an excessive load F2 from the front-rear direction on rough roads having large irregularities. Thereby, it is possible to prevent bending against an excessive load from the front-rear direction. Accordingly, the lug segments can be prevented from being worn and deteriorated even when traveling on a rough road having a large unevenness, so that the durability is improved.

According to a third aspect of the present invention, there is provided a tire provided with a plurality of lug segments provided with a plurality of lugs adjacent to each other in the outer peripheral direction of a rim, provided with a projection having a substantially U-shaped or substantially U-shaped hollow portion. The lug segments have protrusions formed at the front and rear ends of the protrusions in the outer circumferential direction of the rim, and the protrusions of the lug segments are arranged at a predetermined distance La in the outer circumferential direction from the contact portions for positioning adjacent lug segments. Established, and
It is configured such that adjacent lug segments (21, 21) are in contact with each other during overload. According to the above configuration, as shown in FIG. 2, the lug segments have a predetermined interval L1 at which adjacent lug segments do not come into contact with each other when traveling on a road surface with little unevenness such as asphalt.
Adjacent lug segments contact each other when suddenly starting, suddenly braking, or receiving an excessive load F2 from the front-rear direction on rough roads with large unevenness, etc., so that bending against excessive load from the front-rear direction can be prevented. it can. Therefore, the adjacent lug segments do not come into contact with each other when traveling on a road surface with little unevenness such as asphalt, and enable stable running.At the time of sudden start, sudden braking, or a rough road having a large unevenness, the adjacent lug segments are adjacent to each other. As the lug segments touch,
It is possible to prevent bending against an excessive load from the front-rear direction and prevent wear and deterioration, thereby improving durability.

According to a fourth aspect of the present invention, there is provided a tire provided with a plurality of lug segments provided with a plurality of lugs adjacent to each other in the outer peripheral direction of a rim by providing a projection having a substantially U-shaped or substantially U-shaped hollow portion. The relationship between the height h of the contact portion for positioning the matching lug segments and the height H of the pillar portion of the lug segment is set to h <H. According to the above configuration, the contact portion of the lug segment is set to the predetermined height h that facilitates positioning during the assembly of the adjacent lug segment, and the lug segment has a height of the contact portion of the lug segment. The height H of the column portion is set higher than h, and there is no extreme bending and rigidity even when an excessive load in the front-rear direction is applied. Therefore, assemblability of the lug segments is improved, and wear and deterioration can be prevented, so that durability is improved.

According to a fifth aspect of the present invention, there is provided a tire provided with a plurality of lug segments provided with a plurality of lugs adjacent to each other in the outer peripheral direction of a rim by providing a projection having a substantially U-shaped or substantially U-shaped hollow portion. The lug has substantially the same height as the protruding portion of the lug segment, and has a rib fixed to an outer end of the rim in the outer peripheral direction. According to the above configuration,
Since the end portion of the lug segment covers the rib, the adjacent lug segment is elastically deformed under normal load (ground state), and the end portion contacts the rib and is provided on the lug segment body. The intrusion of earth and sand can be prevented by closing the hollow part (opening part) and the concave part. Therefore, it is possible to prevent earth and sand from entering into the hollow portion (opening) and the concave portion provided in the lug segment main body, so that there is no problem that the earth and sand falls during traveling on a public road.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a tire having a lug segment according to the present invention will be described below with reference to FIGS. 9 and 10 with reference to FIGS. 9 and 10 are the same as those in FIGS. First, first
An embodiment will be described with reference to FIG. A large number of lug segments 11 are attached to the outer periphery of the rim 15 by bolts (not shown). Lug segment 11 is hollow 1
1b is provided. This lug segment 11 is hollow part 1
Projection 11 for making 1b substantially U-shaped or substantially U-shaped
c is provided. The lug segment 11 has a protrusion 11a at an end in the front-rear direction. This lug segment 1
1 is a projection 11 of adjacent lug segments 11, 11.
a and 11a so as to have a predetermined interval L1. The lug segment 11 shown in FIG. 1 bends to the state shown by the dotted line when a load F2 in the front-rear direction is applied by the rotational driving force. It has been clarified by an experiment that the flexure amount σ of the lug segment 11 shown by the dotted line is appropriately 1 to 3 mm. That is, the adjacent lug segments 11, 1
In 1, a predetermined interval L1 between the convex portions 11a and 11a and the amount of bending σ are set to L1−σ = 2 ± 1 mm.
Further, the load F2 in the front-rear direction of the lug segment is two to three times the running resistance of the whole vehicle, and when the vertical load F1 and the running resistance value μ (the running resistance value is about 2% of the vertical load F1), , F2 = F1 × μ × (2Or3).

The lug segment 11 shown in FIG. 1 is deflected when an excessively large load (10 to 60% of the vertical load F1) is applied in the front-rear direction when the vehicle starts suddenly, when the vehicle is suddenly braked, or when a rough road having large unevenness is applied. The quantity .sigma.1 is calculated by
The distance between the projections 11a, 11a is larger than a predetermined distance L1. Accordingly, when an excessive load is applied in the front-rear direction due to sudden braking or the like, it is possible to prevent the lug segment from being bent excessively in the front-rear direction due to contact with an adjacent lug segment.

The lug segment 11 has a contact portion 11d.
Is formed. The contact portion 11 of the lug segment 11
The positioning of d is facilitated by the contact portions P of the contact portions 11d of the adjacent lug segments 11 during assembly. The lug segment 11 is formed with a pillar 11e to provide rigidity to a load F2 in the front-rear direction. The relationship between the height h of the contact portion 11d and the height H of the pillar portion 11e is set to h <H.

The operation of FIG. 1 will be described. The lug segment 11 is provided with a protrusion 11c that makes the hollow portion 11 substantially U-shaped or substantially U-shaped.
Are arranged adjacent to each other in the outer circumferential direction of the rim 15. The lug segment 11 has a protrusion 11a at the front and rear ends of the protrusion 11c in the outer circumferential direction of the rim 15. When an excessive load F2 is applied from the front-rear direction, the lug segments 11 are adjacent to each other.
11 are in contact with each other so that there is no large bending. As a result, the lug segment 11 can be prevented from bending against an excessively large load from the front-rear direction, so that wear and deterioration can be prevented even when the vehicle travels on a rough road with large irregularities, so that durability is improved. .

The lug segments 11 are formed with convex portions 11a at the front and rear ends of the projections 11c in the outer circumferential direction of the rim 15, and are arranged at a predetermined interval L1 where the adjacent lug segments 11, 11 do not contact each other. And are arranged such that adjacent lug segments 11, 11 are in contact with each other when overloaded. As shown in FIG. 1, the lug segments 11 have a predetermined distance L1 at which the adjacent lug segments 11, 11 do not come into contact with each other when traveling on a road surface with little unevenness such as asphalt. When the adjacent lug segments 11 and 11 receive an excessive load F2 from the front-rear direction, they can be prevented from bending against an excessive load from the front-rear direction.
Accordingly, the adjacent lug segments 11 and 11 do not come into contact with each other when traveling on a road surface with little unevenness such as asphalt, and can run stably. The contact prevents bending against excessive load F2 from the front-rear direction, thereby preventing wear and deterioration and improving durability.

The lug segment 11 has a relationship between the height h of the contact portion 11d for positioning the adjacent lug segments 11 and 11 and the height H of the pillar portion 11e of the lug segment 11, h. <H. The contact portion 11d of the lug segment 11 is set to a predetermined height h which facilitates positioning of the adjacent lug segments 11, 11 during assembly.
Is designed so that the height H of the pillar portion is set higher than the height h of the contact portion 11d of the lug segment 11, and there is no extreme bending and rigidity even when an excessive load F2 in the front-rear direction is applied. Thereby, assemblability of the lug segment 11 is improved, and wear and deterioration can be prevented, so that durability is improved.

Next, a second embodiment will be described with reference to FIG.
A large number of lug segments 21 and 21 are attached to the outer periphery of the rim 15 by bolts (not shown). The lug segment 21 has a hollow portion 21b. The lug segment 21 has a projection 21c that makes the hollow portion 21b substantially U-shaped or substantially U-shaped. Lug segment 21
Has a protrusion 21e at the end in the front-rear direction. The lug segments 21 are adjacent lug segments 21,
The projections 21e are arranged so as to have a predetermined distance L1 between the projections 21e. The lug segment 21 forms a contact portion 21d. The contact portion 21d of the lug segment 21 is connected to the lug segments 21 and
Positioning is facilitated by the contact portions P of the first contact portions 21d. Also, the protrusion 2 of the lug segment 21
1e is formed at a predetermined distance La from the contact portion 21d.

The operation of FIG. 2 will be described. Adjacent lug segments 21 and 21 do not come into contact with each other when traveling on a road surface with little unevenness such as asphalt, and stable traveling is possible. Further, the lug segments 21 are configured such that, when an excessive load F2 is applied from the front-rear direction, the protruding portions 21e of the adjacent lug segments 21, 21 are in contact with each other, so that there is no large bending. As a result, the lug segment 21 can be prevented from being bent against an excessively large load F2 from the front-rear direction. Therefore, as in the first embodiment shown in FIG. The durability can be improved because it can be prevented.

Next, a third embodiment will be described with reference to FIGS. Many lug segments 21 and 21 shown in FIG. 3 are attached to the outer periphery of the rim 15 by bolts 20A. The lug segment 21 has a hollow portion 21b.
The lug segment 21 is provided with a projection 21c that makes the hollow portion 21b substantially U-shaped or substantially U-shaped. A rib 30 is fixed to an end of the rim 15 to which the lug segment 21 is attached. The rib 30 is shaped to cover the end 21d of the lug segment 21 shown in FIG.

Referring to FIG. 7, which is a view as viewed in the direction X in FIG. The lug segment 21 has a hollow portion 21b, a protrusion 21c, and an end 21d. The lug segment 21 is attached to a rib 30 fixed to the rim 15 by a bolt 20a. The height of the rib 30 is the same as that of the lug segment 21.
Is substantially the same as the height of the projection 21c. FIG. 4 shows a contact state of a tire provided with a lug segment, and the lug segment 21 that is in contact with the ground is elastically deformed by a load. For this reason, the end 21d of the lug segment 21 is shaped to cover the opening formed by the hollow portion 21b and the recesses 21a of the adjacent lug segment 21 in contact with the rib 30 shown in FIGS. It prevents intrusion of earth and sand.

FIG. 5 is a cross-sectional view taken along the line AA of FIG. 5 and FIG. 5 shows a pattern of a lug segment according to the present invention.
The lug segments, rims and ribs are shown schematically and the basic structure is the same as in FIG. As shown in FIG. 5, the lug segment 21 adjacent to the lug segment 21
A is provided on the outer periphery of the rim 15 in a substantially C-shape by A. As shown in FIG. 6, lug segments 21, 21A
Are mounted on the outer periphery of the rim 15 by bolts (not shown). A rib 30 is fixed to the outer end of the rim 15.

The operation of FIGS. 3 to 7 will be described. A tire provided with a plurality of lug segments 21 provided with a plurality of protrusions 21c that make the hollow portion 21b substantially U-shaped or substantially U-shaped, and are arranged adjacent to the outer periphery of the rim 15;
At the same height as the protrusion 21c of the lug segment 21,
In addition, the ribs 30 are fixed to the outer end of the rim 15 in the outer peripheral direction, so that the end 21d of the lug segment 21 covers the rib 30, so that the lug segment 21 is loaded (in a grounded state). Adjacent lug segments 21 are elastically deformed, the end portions 21d come into contact with the ribs 30, and the hollow portions (openings) provided in the lug segment main body are closed. In addition, as shown in FIG. 4, when the tire provided with the lug segments is in a ground contact state, the lug segments 21 that are in contact with the ground are elastically deformed by a load. For this reason,
Since the end 21d of the lug segment 21 is in contact with the rib 30 shown in FIGS. 6 and 7, the end 21d covers the hollow portion 21b and the opening formed by the recesses 21a of the adjacent lug segment 21. , Preventing intrusion of earth and sand. Therefore, it is possible to prevent intrusion of earth and sand into a hollow portion (opening) provided in the lug segment main body, so that there is no problem that the earth and sand falls during traveling on a public road.

Next, a fourth embodiment of a tire provided with a lug segment according to the present invention will be described with reference to FIG. As shown in FIG. 8, the lug segment 22 has a hollow portion 22b.
Are formed in a substantially U-shape or a substantially U-shape. The lug segment 22 has a convex portion 22a at the front and rear ends in the outer peripheral direction of the rim 15. Also, a predetermined distance L at which the adjacent lug segments 22, 22 do not contact each other.
1 is located. According to the fourth embodiment, since the ends of the lug segments 22 are formed on the protruding portions 22a, the ends 22a, 22a of the adjacent lug segments 22, 22 are formed.
It is possible to prevent the adhesion of earth and sand between them. Accordingly, it is possible to prevent the adhesion of the earth and sand between the ends of the adjacent lug segments, so that there is no problem that the earth and sand falls while traveling on the public road. In addition, since the adjacent lug segments 22 have a predetermined distance L1 at which they do not come into contact with each other, the adjacent lug segments come into contact with each other and generate heat, so that wear and deterioration do not occur.

Although the tire provided with the lug segment of the present invention has been described by using a wheeled construction vehicle,
It goes without saying that the present invention can be applied to construction vehicles such as wheel loaders and industrial vehicles.

[Brief description of the drawings]

FIG. 1 is a side view of a lug segment according to a first embodiment of the present invention.

FIG. 2 is a side view of a lug segment according to a second embodiment of the present invention.

FIG. 3 is a side view of a lug segment according to a third embodiment of the present invention.

FIG. 4 is an explanatory view when the lug segment of the tire is in contact with the ground.

FIG. 5 is a diagram showing a lug segment pattern of the tire.

FIG. 6 is a sectional view taken along line AA of FIG. 5;

FIG. 7 is an X view of FIG. 3;

FIG. 8 is a side view of a lug segment according to a fourth embodiment of the present invention.

FIG. 9 is a side view of the wheeled construction vehicle.

FIG. 10 is a diagram illustrating a tire mounting structure.

FIG. 11 is a diagram illustrating a tire structure provided with a conventional lug segment.

FIG. 12 is an explanatory diagram of the lug segment in FIG. 11;

FIG. 13 is an explanatory view when the lug segment of FIG. 11 is grounded.

[Explanation of symbols]

 11, 21, 21A, 22 Lug segment 11a, 21e22a Convex portion 11b, 21b, 22b Hollow portion 11c, 21c, 22c Projection portion 11d, 21d Contact portion 11e Column portion 15 Rib 20 Tire

Claims (5)

[Claims] 1. A tire provided with a plurality of lug segments which are provided with projections for making the hollow portion substantially U-shaped or substantially U-shaped and which are arranged adjacently in the outer peripheral direction of the rim. 11, 22) form projections (11a, 22a) at the front and rear ends of the projections (11c, 22c) in the outer circumferential direction of the rim (15),
A tire provided with a lug segment which is disposed at a predetermined distance L1 such that adjacent lug segments (11, 22) do not come into contact with each other when touching the ground. 2. A tire comprising a plurality of lug segments which are provided with projections which make the hollow portion substantially U-shaped or substantially U-shaped and which are arranged adjacently in the outer circumferential direction of the rim. 11) is the protrusion in the outer circumferential direction of the rim (15).
(11c) are formed with convex portions (11a) at the front and rear ends thereof, and are disposed so that adjacent lug segments (11, 11) are in contact with each other when overloaded. tire. 3. A tire provided with a plurality of lug segments which are provided with projections for making the hollow portion substantially U-shaped or substantially U-shaped and which are arranged adjacent to each other in the outer peripheral direction of the rim. 21) is the protrusion in the outer circumferential direction of the rim (15).
A protrusion (21e) is formed at the front and rear ends of (21c), and a protrusion (21e) of the lug segment (21) is formed from a contact portion (21d, 21d) for positioning the adjacent lug segment (21, 21). A tire provided with a lug segment which is disposed at a predetermined distance La in an outer peripheral direction and is disposed so that adjacent lug segments (21, 21) are in contact with each other when overloaded. 4. A tire provided with a plurality of lug segments provided with a plurality of lugs adjacent to each other in the outer peripheral direction of a rim by providing a projection having a substantially U-shaped or substantially U-shaped hollow portion. The relationship between the height h of the contact portion (11d, 11d) for positioning between (11, 11) and the height H of the pillar portion (11e) of the lug segment (11) is defined as h <H. A tire provided with a lug segment. 5. A tire provided with a plurality of lug segments which are provided with a hollow portion having a substantially U-shape or a substantially U-shape and which are provided adjacent to each other in the outer circumferential direction of a rim. At the same height as the protrusion (21c) of (21),
A tire provided with a lug segment, comprising a rib (30) fixed to an outer peripheral end of the rim (15).