JP2804104B2 - Elastic track - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an elastic endless track belt used as a traveling device of a construction work machine or the like.

[Conventional technology]

Generally, in this type of elastic endless track belt, a core bar is buried at constant intervals in a circumferential direction in an endless track band main body, and a pair of guide protrusions provided at the center in the width direction of the core bar are formed by a track belt main body. The guide wheel protrudes inward from the inner peripheral surface, and the rolling wheel rolls using the top surface of the guide projection as a raceway surface.

Further, in another type of elastic endless track belt, a pair of terraces having a height lower than the top surface of the guide projection is provided outside the guide projection of the core bar in the width direction, and the top surface of the guide projection and the terrace are provided. The rolling wheel rolls using the top surface as a raceway surface.

[Problems to be solved by the invention]

In the conventional elastic endless track belt, the circumferential width of one guide protrusion and the other guide protrusion of the metal core protrudes from the metal core base edge in the circumferential front-rear direction with respect to the width direction center line of the metal core. As a result, both top surfaces of the guide projections are discontinuous in the circumferential direction between the core metals adjacent to each other in the circumferential direction, and there is no overlapping portion in the side projection area.

Also, in the elastic endless track zone in which the core metal is provided with the guide protrusions and the terraces, the circumferential arrangement of the top surfaces of the terraces between the circumferentially adjacent core bars becomes discontinuous similarly to the guide protrusions. ing.

Therefore, the rolling wheel that rolls with the top surface of the guide protrusion of the core metal as the raceway surface, or the rolling wheel that rolls with the top surface of the guide protrusion of the core metal and the top surface of the terrace as the raceway surface is adjacent in the circumferential direction. There is a problem that a large vibration is generated at a discontinuous portion between the guide protrusions of the metal core or between the terraces to generate a large vibration and the traveling becomes unstable.

Furthermore, in the conventional elastic endless track belt, since the circumferential gap between the guide protrusions of the core bars adjacent in the circumferential direction is narrow, soapy easily occurs in this gap, and thereby the drive wheel and the guide wheel are In the winding portion, there is a problem that the tensile member buried on the outer peripheral side of the core bar may be broken by receiving a large tension, thereby shortening the service life.

The present invention solves the above-described problem by providing an elastic endless track belt in which a rolling track surface of a cored bar is continuous in a circumferential direction, and a circumferential gap between guide protrusions of adjacent cored bars is also widened. The purpose is to provide.

[Means for solving the problem]

In order to achieve the above object, in the first invention, an endless track belt body made of rubber substance and a pair of guide projections having a rolling track surface for rolling wheels are provided at the center in the width direction of a flat base. Provided with a cored bar, a base of the cored bar arranged in the width direction at a constant interval in the circumferential direction is buried in the track band main body, and a pair of guide protrusions are formed from the inner peripheral surface of the track band main body. Also, in the elastic endless track band protruded inward, each of the pair of guide protrusions of the core metal has one orbital surface and the other orbital surface which are opposite to each other in the circumferential direction, and are arranged between adjacent metal cores. And extending in the circumferential direction beyond the bisector of the circumferential interval of the core, the circumferential edges on the opposite side to the extending side are closer to the center of the core than the circumferential edges of the core base, and On each circumferential end face of the pair of guide protrusions of gold opposite to the extending side of the raceway surface, the width of the core metal in the width direction of each raceway surface is set. The extended side from the line is formed with the inclined surface of the descending slope towards the base edge as the edge of the deviated circumferential opposite.

Further, in the second invention, a track belt body made of an endless rubber substance and a pair of guide protrusions having a first track surface for rolling of a rolling wheel are provided at the center in the width direction of a flat base.
A pair of terraces having a second raceway surface having a height lower than the first raceway surface of the guide projections, and a core bar provided outside the width direction of the guide projections; In the elastic endless track band in which a base portion of a core bar arranged in the width direction at an interval is buried and a pair of guide protrusions and terraces project inward from the inner peripheral surface of the track belt body, Of the pair of guide projections on one end of the first raceway surface and the other end of the first raceway surface on the opposite side in the circumferential direction beyond the bisector of the circumferential interval between adjacent cored bars. , The circumferential edges on the opposite side to the extending side are closer to the core metal center than the circumferential edges of the metal core base, and one of the pair of terraces has a second track surface and a second second track surface. The track surface is defined as a circumferential edge of the guide protrusion adjacent to each other in the circumferential direction opposite to the extension side of the first track surface,
Circumferential end faces of the pair of guide protrusions of the core bar that extend in the circumferential direction beyond the bisector of the circumferential interval between adjacent core bars and that are opposite to the extension side of the first raceway surface of the pair of guide protrusions of the core bar. In addition, an inclined surface is formed having a circumferential position deviated from the center line in the width direction of the core of each of the first raceways to the side opposite to the extension side as an end edge toward the base end edge. .

〔Example〕

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

 1 to 3 show an embodiment of the first invention.

The elastic endless track belt shown in FIG. 1 includes a track belt body 10 made of an endless rubber substance, a plurality of metal cores 20 integrally embedded in the track belt body 10, a plurality of steel cords, and the like. The core metal 20 is composed of the orbital belt body.
Tensile members 30 are arranged in the width direction at regular intervals in the circumferential direction of the core 10, and are arranged in the circumferential direction of the track belt body 10 so as to surround the outer peripheral sides of both sides in the width direction of the cored bar 20.

The metal core 20 has a meshing portion 22 that engages with the driving wheel at the center in the width direction of the flat base 21, and a pair of guide projections that sandwich and guide the driving wheel and the guide wheel from both sides of the meshing portion 22. 23a, 23
b is set high (drive wheels and guide wheels are not shown),
The base 21 is buried in the track band main body 10, the meshing portion 22 and the guide protrusions 23a, 23b project inward from the inner peripheral surface of the track band main body 10, and the track formed on the top surface of the guide protrusions 23a, 23b. Surface 24a, 2
The rolling surfaces 41a and 41b of the rolling wheel 40 roll on 4b.

The track band body 10 is provided with an engaging hole 11 through which the teeth of the drive wheel fits through the inner and outer circumferential surfaces on the circumferential center line between the adjacent cored bars 20. , A ground lug 12 is formed at a position corresponding to the mandrel 20.

In the elastic endless track belt, one of the pair of guide protrusions 23a and 23b of the cored bar 20 has an extension 25a extending to one side in the circumferential direction at the top, and one of the guide protrusions 23a is provided at the top.
The other guide projection 23b is provided at the top with an extension 25b extending to the other side in the circumferential direction. These extensions 25a, 2
The top surfaces of 5b form extensions of the raceway surfaces 24a, 24b, respectively, and the edges of the extending portions 25a, 25b are border lines in the width direction which divide the circumferential interval of the adjacent cored bar 20 into two equal parts. And extends in the circumferential direction.

Also, of the pair of guide protrusions 23a and 23b of the cored bar 20, the circumferential end surface 26a on the opposite side to the extending portion of the raceway surface 24a of one of the guide protrusions 23a faces the circumferential edge of the base 21. Similarly, a downward slope is formed on the circumferential end surface 26b of the other guide projection 23b on the opposite side of the extending portion of the raceway surface 24b toward the circumferential edge of the base 21. An inclined surface is formed. The edges of the circumferential end surfaces 26a, 26b on the track surfaces 24a, 24b side are deviated in the circumferential direction on the opposite side to the extended portions of the core metal 20 of the core surfaces 20 of the track surfaces 24a, 24b. Rank,
It is located on the center line side in the width direction of the metal core 20 from the circumferential edge of the metal core base 21 on the opposite side.

The elastic endless track belt configured as described above has the extended portions 25a, 25b provided on the pair of guide protrusions 23a, 23b of the cored bar 20 and the overlapping portion in the side projection area thereof, so that the track surfaces 24a, 24b Since the discontinuous portions in the circumferential direction are joined, the space between one raceway surface 24a and the other raceway surface 24b is continuous between the metal cores 20 adjacent in the circumferential direction.

Therefore, the raceway surface 24 of the guide projections 23a and 23b of the core 20
The rolling wheel 40 that rolls a and 24b rolls in a state where at least one of the rolling surfaces 41a and 41b is always riding on one of the raceway surfaces 24a and 24b. I do.

Further, the guide protrusions 23a and 23b of the core metal 20 adjacent in the circumferential direction are provided.
Between each other, the circumferential end surfaces 26a, 26b on the opposite side to the extending portions 25a, 25b are slopes with a downward slope, so that a gap that is widely opened toward the inner circumferential side is formed. ,
Stone blocks and the like that have entered the gap can be easily discharged.

 4 to 6 show an embodiment of the second invention.

The elastic endless track belt in FIG.
A pair of terraces 27a, 27b projecting inward from the inner peripheral surface of the track belt body 10 with a height lower than the top surface of the guide projections 23a, 23b is provided on the outer side in the width direction of b.

The rolling wheel 40 has inner rolling surfaces 41a, 41b and outer rolling surfaces 42a, 42b, and has first raceway surfaces 24a, 24b formed on the top surfaces of the guide projections 23a, 23b of the cored bar 20. Upper inside rolling surface 41a, 4
1b rolls, and the outer rolling surfaces 42a, 42b roll on the second raceway surfaces 28a, 28b formed on the top surfaces of the terraces 27a, 27b.

The second raceway surface 28 of the pair of terraces 27a, 27b of the cored bar 20
a and 28b, one of the second raceway surfaces 28a is formed on the periphery of the core metal 20 adjacent to the guide protrusion 23a on the side opposite to the extension side of the first raceway surface 24a in the circumferential direction. The other second raceway surface 28b extends in the circumferential direction beyond the bisector of the direction interval, and the other second raceway surface 28b similarly has a guide protrusion 23b on the opposite side from the extension side of the first raceway surface 24b. The circumferential edge extends in the circumferential direction beyond the bisector of the circumferential interval between the adjacent cored bars 20.

With this configuration, a pair of terraces of the cored bar 20 are formed.
Since the circumferentially extending portions provided on 27a and 27b and the overlapping portions in the side projection area join the circumferentially discontinuous portions of the second raceway surfaces 28a and 28b, they are circumferentially adjacent to each other. Between the metal cores 20, the space between the second raceway surfaces 28a and 28b is continuous.

Since the configuration other than the above is the same as that of the above-described first invention, the same portions will be denoted by the same reference numerals, and description thereof will be omitted.

In the second invention, the first raceway surfaces 24a, 24b of the guide projections 23a, 23b of the cored bar 20 and the second raceway surfaces 28a, 28b of the terraces 27a, 27b.
The rolling wheel 40 rolls while at least one of the inner rolling surfaces 41a and 41b always rides on one of the first raceway surfaces 24a and 24b, and the outer rolling surface. It rolls in a state where at least one of the surfaces 42a and 42b is always riding on one of the second track surfaces 28a and 28b.

In particular, according to this embodiment, the inner rolling surface 41 of the
When one of the sides a, 41b, for example, the inner rolling surface 41a is associated with the discontinuous portion of the first raceway surface 24a, the inner rolling surface 41b on the other side becomes the corresponding first raceway surface. The outer rolling surface 42b of the rolling wheel 40 rolls on the second raceway surface 28b at the same position as the circumferential direction of the discontinuous portion of the first raceway surface 24a.
The outer rolling surface 42 on the other side
Since a rolls on the corresponding second raceway surface 28a,
The inner rolling surfaces 41a, 41b and the outer rolling surfaces 42a, 42b of the rolling wheel 40 meet at a discontinuous portion on one and the same side of the first raceway surfaces 24a, 24b and the second raceway surfaces 28a, 28b. And the rolling wheels 40 can be guided in a stable state.

〔The invention's effect〕

As described above, according to the first invention, since the rolling wheel that rolls with the top surface of the guide protrusion of the cored bar as the raceway surface has the circumferentially extending portion provided on the raceway surface, the adjacent core is Since there is no possibility of falling from the raceway between the golds, generation of vibration can be prevented, and an elastic endless track belt having smooth and stable running performance can be obtained.

Further, according to the first aspect, the inclined surface is formed on the circumferential end surface of the core bar on the side opposite to the raceway surface extending side to widen the circumferential gap between the guide protrusions. Therefore, biting of the stone is less likely to occur, so that the tensile member can be prevented from being broken, and the durability can be increased.

According to the second invention, the rolling wheel that rolls with the top surface of the guide protrusion of the cored bar and the step outside the width direction as the raceway surface is provided with a circumferentially extending portion on each raceway surface. Therefore, it does not fall from the track surface between the adjacent metal cores, so that generation of vibration can be prevented, and an elastic endless track band having smooth and stable running performance can be obtained.

Further, according to the second aspect, the inclined surface is formed on the circumferential end surface of the guide protrusion of the core bar opposite to the track surface extending side, so that the circumferential gap between the guide protrusions is widened. Therefore, biting of the stone is less likely to occur, so that the tensile member can be prevented from being broken, and the durability can be increased.

[Brief description of the drawings]

1 to 3 show an embodiment of the first invention, and FIG.
FIG. 2 is a partial plan view, FIG. 2 is a cross-sectional view taken along line ADEF of FIG. 1, FIG. 3 is a cross-sectional view taken along line BCDE of FIG. 1, and FIGS. 4 is a partial plan view, FIG. 5 is a sectional view taken along the line ADEF in FIG. 4, and FIG. 6 is a sectional view taken along the line BCDE in FIG. In the figure, 10 is the track band main body, 20 is the core bar, 21 is the base, 23a, 23b
Is a guide projection, 24a and 24b are track surfaces (first track surfaces), 26a and 2
6b is a circumferential end surface, 27a and 27b are terraces, 28a and 28b are second raceway surfaces, 40 is a rolling wheel, 41a and 41b are rolling surfaces (inward rolling surfaces), 42a and 4
2b is an outer rolling surface.

Claims (2)

(57) [Claims] An orbital belt body made of an endless rubber substance;
A pair of guide projections having a raceway surface for rolling of the rolling wheel is provided with a core bar provided at the center in the width direction of the flat base, and in the raceway band main body, at a constant interval in the circumferential direction, in the width direction. In the elastic endless track band in which the base of the arranged core is buried and the pair of guide protrusions project inward from the inner peripheral surface of the track band main body, one track surface of the pair of guide protrusions of the core is used. One circumferential edge of the circumferential direction and the circumferential edge of the other raceway surface on the opposite side extend in the circumferential direction beyond the bisector of the circumferential interval between the adjacent metal cores. In addition, each peripheral edge opposite to the extension side is set to be closer to the center of the core than the peripheral edge of the core base, and the extension side of the track surface of the pair of guide protrusions of the core is On the opposite circumferential end face, the circumferential position deviated from the center line in the width direction of the core metal of each track surface to the opposite side to the extension side is the edge. Elastic endless track, characterized in that the formation of the inclined surface a descending slope towards the base edge and. 2. A track band main body made of an endless rubber substance;
A pair of guide projections having a first raceway surface for rolling the rolling wheel is provided at the center in the width direction of the flat base.
A pair of terraces having a second raceway surface having a height lower than the raceway surface is provided with a cored bar provided on a widthwise outside of the guide projection;
In the track belt body, a base of a core bar arranged in the width direction at a constant interval in the circumferential direction is embedded, and a pair of guide protrusions and terraces project inward from the inner peripheral surface of the track belt body. One end of the pair of guide protrusions of the core metal in the circumferential direction of one of the pair of guide protrusions, and the circumferential end of the other first track surface on the opposite side. Are extended in the circumferential direction beyond the bisector of the circumferential interval between the adjacent metal cores, and the circumferential edges on the side opposite to the extending side are separated from the metal core base circumferential edges. The second track surface of both of the pair of terraces is adjacent to the peripheral edge of the guide track adjacent to each terrace in the circumferential direction on the opposite side to the extension side of the first track surface. The core metal extends in the circumferential direction beyond the bisector of the circumferential interval of the metal core, and is opposite to the extension side of the first raceway surface of the pair of guide protrusions of the metal core. On each circumferential end surface, a slope inclined downward toward the base end edge with a circumferential position deviated from the center line in the width direction of the core of each first raceway surface to the side opposite to the extension side as an end edge. An elastic endless track zone characterized by being formed.