JP5269557B2 - Elastic crawler - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an elastic crawler that prevents outbreaks of cracks in end parts in the cross direction. <P>SOLUTION: This elastic crawler 1, of which circulating direction Cd is predetermined when installing it in a crawler type travelling vehicle, is formed of: a crawler body 4 formed into an endless belt of rubber; a plurality of lugs 6 extending from the inside in the cross direction of the crawler body toward edges thereof; and a plurality of cores 2 embedded in the crawler body with an interval in the circumferential direction. The core has a buffer part 29 formed thick on the inner peripheral side of the crawler body near corners on the same side in the cross direction in both ends in the longitudinal direction, and arranged inside the crawler body so that the buffer part is positioned on a side in the circulating direction when circulating in the circulating direction. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to an elastic crawler that is mounted on a crawler type traveling vehicle and in which a core metal is embedded.

Crawler-type traveling vehicles for civil engineering work such as combine and crawler-type tractors and mini excavators are equipped with elastic crawlers with a cored bar embedded in an elastic body such as rubber to reduce vibration during traveling In addition, road surface damage is prevented when traveling on general paved roads.
However, an elastic crawler is weaker than an iron crawler, and when the end of the elastic crawler climbs on a curbstone or the like, the end of the elastic crawler bends, and if this is repeated, minute cracks are likely to occur inside due to fatigue. Further, when the end bending is repeated, this fine crack grows due to stress concentration and reaches the boundary with the core bar, and in some cases, it causes a loss of the end of the elastic crawler. It was.

In response to this problem, for example, an elastic crawler is proposed in which a core metal whose longitudinal ends are bent toward the traveling road surface is embedded in the elastic body, thereby suppressing the occurrence of cracks at the end in the width direction and preventing the ear from being cut off. (Patent Document 1).
JP 2006-151140 A

  The elastic crawler described in Patent Document 1 pays attention to the prevention of problems when the end in the width direction is repeatedly bent to the ground contact surface side (the outer peripheral side when mounted on a crawler type traveling vehicle) (Patent). Reference 1, paragraph 0014 and FIG. 3). In Patent Document 1, the disclosed elastic crawler is similarly applied to a case where the end in the width direction is repeatedly bent to the side opposite to the ground surface side, for example, the elastic crawler rides on a curbstone or the like. Although it is described that ear-cutting is prevented, it is surmised from the disclosed structure that there is a slight problem in the crack prevention effect when the end in the width direction is repeatedly bent to the side opposite to the ground plane side. .

  This invention is made | formed in view of the above-mentioned problem, and it aims at providing the elastic crawler in which generation | occurrence | production of the crack of the width direction edge part was suppressed.

Engaging Ru elastic crawler with the present invention, the circulation direction of an elastic crawler which is specified, and the crawler body formed in an endless belt of a rubber, circumference of the crawler body when it is mounted on the crawler type traveling vehicle A plurality of lugs arranged at intervals in the direction and projecting from the outer peripheral surface of the crawler body and extending from the inner side in the width direction of the crawler body toward the edge in the width direction, and spaced in the circumferential direction A plurality of cored bars embedded in the crawler body, the cored bar being located on the inner peripheral side of the crawler body in the vicinity of the corners on the same side in the width direction at both ends in the longitudinal direction. A buffer portion that is thickly swelled or a buffer portion that is formed by bending the corner to the inner peripheral side of the crawler body, and a side where the buffer portion in the width direction at both ends in the longitudinal direction is provided. Near the opposite corner A second buffer portion that is thickened on the outer peripheral side of the crawler main body or a second buffer portion that is bent on the outer peripheral side of the crawler main body, and circulates in the circulation direction. The buffer portion is disposed in the crawler main body so as to be positioned on the circulation direction side.

Here, the “circulation direction” is a direction in which the elastic crawler circulates when the crawler type traveling vehicle travels for that purpose.
The second buffer portion is formed so as not to include an intersecting line formed by intersecting two surfaces on its surface, or a corner formed by a surface intersecting with a side surface in the vicinity of the corner that is bent and inclined. It is preferably a curved surface.

The buffer portion does not have a corner formed by a surface where the side surface in the vicinity of the corner that is raised or thickened so as not to include the intersection line formed by the intersection of the two surfaces on the surface or is bent and inclined. It is preferably a curved surface.
The cored bar is arranged so that the buffer portions at both ends in the longitudinal direction overlap any of the lugs in the circumferential direction.

Preferably, the buffer portion formed by bending the corner toward the inner peripheral side of the crawler body has a maximum inclination angle θ of a surface on the bent side when the metal core is viewed from the outside in the longitudinal direction. It is 15 degrees or more and 45 degrees or less.
Preferably, rubber having a higher hardness than the other portions of the crawler body is used around both ends in the longitudinal direction of the cored bar.

The cored bar is arranged so that the second buffer portions at both ends in the longitudinal direction overlap with any of the lugs in the circumferential direction.
The lug extends from the inner side in the width direction to the opposite side of the circulation direction and extends toward the edge in the width direction.
Another elastic crawler according to the present invention includes a crawler main body formed in an endless belt shape with rubber, a plurality of core bars embedded in the crawler main body at intervals in the circumferential direction of the crawler main body, and the circumferential direction Are spaced apart from each other and protrude from the outer peripheral surface of the crawler body, respectively, on both sides in the width direction of the crawler body from the inner side in the width direction toward the edge in the width direction substantially perpendicular to the circumferential direction. The core bar is formed of a plurality of lugs extending in the vicinity of the corners on either side of the width direction at both ends in the longitudinal direction, and the buffer is raised to the inner peripheral side of the crawler body. Each of the core bars adjacent to each other in the circumferential direction overlaps one of the lugs in the circumferential direction. And one of the above Each of the buffer portion of the metal core adjacent overlapping the grayed are formed is arranged so as to be mutually distant position.

  In the above description, both the longitudinal direction and the width direction in “(the core metal) is in the width direction at both ends in the longitudinal direction” are those in the core metal. In addition, the “width direction” in the metal core is synonymous with the circumferential direction in the elastic crawler.

  ADVANTAGE OF THE INVENTION According to this invention, the elastic crawler in which generation | occurrence | production of the crack of the width direction edge part was suppressed can be provided.

1 is a view of the elastic crawler 1 viewed from the inner periphery side, FIG. 2 is a cross-sectional view taken along arrow AA in FIG. 1, FIG. 3 is a plan view of the core metal 2, and FIG. 5 is a right side view of FIG. 5 is a view of the cored bar 2 in FIG. 4 as viewed from the right side.
In the following description, the grounding side of the elastic crawler 1 when mounted on a crawler type traveling vehicle is referred to as “outer peripheral side”, and the opposite side of the grounding side is referred to as “inner peripheral side”. Further, the direction in which the elastic crawler 1 circulates when the crawler type traveling vehicle travels is “circumferential direction”, and the direction orthogonal to the circumferential direction at this time and parallel to the rotation axis of the wheel of the crawler type traveling vehicle is parallel It shall be called “width direction”.

1 and 2, the elastic crawler 1 includes cored bars 2, 2, 2, a crawler body 4, lugs 6,..., 6, a pair of tensile bodies 8, 8, and the like.
The cored bar 2 is formed of a hard material such as metal. 3 to 5, the core metal 2 has a generally long shape as a whole, and has a protrusion-provided portion 21 at the center thereof, wing portions 22 arranged on both sides in the longitudinal direction with respect to the protrusion-provided portion 21, 22, and the protrusion-provided portion 21 and the wing portions 22, 22 are all arranged at a portion where the wing portions 22, 22 are continuous.

The protrusion-attached portion 21 has a semicircular cross section perpendicular to the longitudinal direction, and a pair of protrusions that protrude toward the curved surface 25 side of the semicircle immediately adjacent to the wing portions 22 and 22 on both sides in the longitudinal direction. Parts 26 and 26 are provided.
The protruding portion 26 is a wheel running surface 34 whose protruding end is a substantially flat surface (see FIG. 5), and the wheel running surface 34 is either in the circumferential direction as a whole in plan view (FIG. 3). It extends to one side. The pair of protrusions 26 and 26 are formed on the core metal 2 by the respective rolling wheel running surfaces 34 and 3.
4 is formed so that it may extend to the mutually different one side of the circumferential direction. The wheel running surfaces 34 and 34 are for guiding the wheels so that the elastic crawler 1 does not fall off the wheels when the crawler type traveling vehicle to which the elastic crawler 1 is attached travels.

  The main part of the wing portion 22 has a flat plate shape, and the flat plate portion 27 is reinforced by ribs 28 extending in the longitudinal direction. A buffer portion raised to a thickness of 10 to 20 mm from the edge toward the inside in the longitudinal direction at the end in the longitudinal direction on the surface of the wing portion 22 on the side (inner peripheral side) from which the projection 26 projects. 29 is provided. In the following description, the “buffer portion 29” includes a raised portion and a part of the flat plate-like portion 27 that serves as a base of the raised portion (thick portion).

  The buffer portions 29 and 29 provided on the wing portions 22 and 22 on both sides are both edge portions on the same one side in the width direction of the core metal 2 (herein, the direction perpendicular to the longitudinal direction of the core metal 2). It is continuous. The buffer portions 29, 29 on both sides are arranged on one side with respect to the width direction of the core metal 2 and disappear before reaching the edge on the other side in the width direction of the core metal 2. The surface 30 in the raised portion of the buffer portion 29 does not include an intersecting line formed by intersecting two surfaces. Further, at least the end surface in the width direction, the outer peripheral surface, and the inner peripheral surface other than the buffer portion 29 are continuously curved with no curved line formed by the intersection of the two surfaces. (See FIGS. 2 to 5). Therefore, the surface of the buffer part 29 is formed with a continuous curved surface.

The buffer portion 29 is formed on the surface of the wing portion 22 on the inner peripheral side of the elastic crawler 1 on the surface of the wing portion 22 from one edge in the width direction to the other edge in the range of one third to three minutes. 2 or less. The degree of bulging of the buffer portion 29 is preferably 3 to 10 mm with respect to the flat portion 27.
The first side protrusions 23 and 23 are different from each other in a portion where the protrusion-attached portion 21 and the wing portions 22 and 22 are continuous, and both are provided with buffer portions 29 and 29 in the width direction of the cored bar 2. It protrudes from the side of the other side.

The second side protrusions 24, 24 are different from each other in a portion where the protrusion-attached portion 21 and the wing portions 22, 22 are continuous, both of which are provided with the buffer portions 29, 29 in the width direction of the cored bar 2. It protrudes from the opposite side. The distance between the second side protrusions 24 and 24 is slightly longer than the distance between the outer sides in the longitudinal direction of the core metal 2 of the first side protrusions 23 and 23.
The cored bar 2 is arranged such that the protrusions 26 and 26 are on the inner peripheral side of the crawler body 4 and the buffer parts 29 and 29 are positioned on the side of the circulation direction Cd when the crawler type traveling vehicle travels normally. Thus, they are embedded at substantially equal intervals in the circumferential direction. In the elastic crawler 1, the buffer portions 29, 29 provided on the core metal 2 swell toward the inner peripheral side. Here, the “circulation direction Cd” is a direction in which the elastic crawler 1 circulates when the crawler type traveling vehicle travels for that purpose, and refers to one of the circumferential directions. The normal “circulation direction Cd” is a direction in which the elastic crawler 1 circulates when the crawler type traveling vehicle moves forward.

The core metal 2 is embedded in the crawler main body 4 in consideration of the circulation direction Cd of the elastic crawler 1, and the elastic crawler 1 in which the core metal 2 is embedded in this way is used when traveling for that purpose. The crawler type traveling vehicle is mounted such that the circulation direction is the circulation direction Cd.
The crawler body 4 is formed in an endless belt shape by joining both ends of a thick rubber strip. The crawler body 4 is provided with engagement holes 41,..., 41 penetrating the inner peripheral side and the outer peripheral side at the center in the width direction between the adjacent cored bars 2, 2 embedded. The engagement hole 41 is engaged with a claw of a drive wheel of a crawler type traveling vehicle to which the elastic crawler 1 is mounted, and causes the elastic crawler 1 to circulate by rotation of the drive wheel.

  A rubber having a higher hardness than that of other portions in the crawler body 4 is used in the periphery AR (see FIG. 2) around the longitudinal end portion of the wing portion 22 of the core metal 2 in the crawler body 4. The “periphery A around the longitudinal end of the wing 22” corresponds to the longitudinal end of the wing 22 and the width of the buffer portion 29 in the width direction of at least the outer peripheral side and the inner peripheral side in the vicinity of the end. It is the range that covers the range. In the crawler body 4, rubber having a higher hardness than that of other portions may be used in a portion on the inner peripheral side of the cored bar 2.

The rubber having a high hardness herein refers to a rubber having a durometer measurement value (durometer hardness) in accordance with “JIS K 6253” of 70 degrees or more and 90 degrees or less. It is assumed that the durometer hardness of the other parts of the crawler body 4 and the lugs 6,... 6 is lower than the hardness of the rubber used for the periphery AR of the longitudinal end of the wing part 22. A rubber having a hardness of 65 degrees or more and 80 degrees or less is selected.

From the outer peripheral surface of the crawler body 4, lugs 6, 6, 6 that protrude from the sides of the engagement holes 41, 41, 41 toward the ends in the width direction protrude separately on both sides in the width direction.
The lug 6 has two engagement holes 41 (41b) adjacent to the engagement hole 41 around the one engagement hole 41 (41a) in the circumferential direction at the root (net) of the inner end in the width direction. ), 41 (41c). The end of the ground contact end surface 61 of the lug 6 (6a) in the width direction that is in contact with the ground at the time of traveling has both sides of the engagement hole 41 (41a) in the circumferential direction with the engagement hole 41 (41a) being substantially centered in the circumferential direction. The metal cores 2 and 2 arranged on the metal cores 2 are wide in width and reach substantially the center of the respective widths.

  The ground contact end face 61 extends toward the end in the width direction while being inclined toward the circulation direction Cd. An edge 62 that continues from the inner side in the width direction on the circulating direction Cd side to the width direction end side of the crawler body 4 on the grounding end surface 61 starts from a position where it overlaps the cored bar 2 (2a) at approximately the center in the width direction. It extends as a curve that protrudes toward the circulation direction Cd, and deviates from the overlap with the core metal 2 (2a) at substantially the center in the longitudinal direction of the blade portion 22 of the core metal 2 (2a). Thereafter, the end edge 62 is located approximately one third of the wing portion 22 inward from the longitudinal end of the core 2 (2b) disposed on the side opposite to the circulation direction Cd. Overlapping (2b). The edge 62 further crosses the wing portion 22 at an angle, and at the corner (corner) on the opposite side of the circulation direction Cd at the end in the longitudinal direction, the edge 62 is separated from the core metal 2 (2b). Crosses the outer edge 63 in the width direction extending in the direction.

Here, “overlap” and “overlap” mean overlapping when the elastic crawler 1 is seen through from the inner peripheral side to the outer peripheral side, and when the elastic crawler 1 is seen through from the inner peripheral side to the outer peripheral side. Is specifically shown in FIG.
A root 64 corresponding to the edge 62 in the lug 6 (6 a) extends in the width direction from the inner side to the edge in a shape similar to the edge 62. In the vicinity of the inner start point in the width direction, the root 64 is a curve that substantially overlaps the end of the core metal 2 (2a) on the side of the circulation direction Cd and is convex in the direction of the circulation direction Cd in the overlapped state. While being inclined to the opposite side, the overlap with the cored bar 2 (2a) is released at a position of about one third of the wing portion 22 inward from the end in the longitudinal direction. Thereafter, the root 64 is inclined to the side opposite to the circulation direction Cd, and overlaps with the core metal 2 (2b) near the end in the longitudinal direction of the core metal 2 (2b) adjacent to the side opposite to the circulation direction Cd. Soon, the overlap is released and the end of the crawler body 4 is reached.

Here, the “base 64 corresponding to the edge 62” refers to a portion (line) where the side surface of the lug 6 (6a) facing the substantially circulating direction Cd intersects the outer peripheral surface of the crawler body 4.
An end edge 65 that continues from the inner side in the width direction on the side opposite to the circulation direction Cd on the ground end surface 61 to the end in the width direction of the crawler body 4 starts from a position that overlaps the core metal 2 (2b) at the approximate center of the width. As a curved line convex toward the circulation direction Cd and extending inclined to the opposite side of the circulation direction Cd, at a position approximately two thirds from the end of the wing portion 22 of the core metal 2 (2b). The overlap with gold 2 (2b) is removed. The edge 65 is located approximately one third of the wing portion 22 inward from the longitudinal end of the core 2 (2c) adjacent to the core 2 (2b) on the side opposite to the circulation direction Cd. It overlaps with the cored bar 2 (2c). The edge 65 further crosses the wing portion 22 at an angle, and at the end on the opposite side of the circulation direction Cd at the longitudinal end, the edge 65 is overlapped with the cored bar 2 (2c). Intersects with the end edge 63.

  The root 66 corresponding to the edge 65 extends in the width direction from the inner side to the edge in a shape similar to the edge 65. In the vicinity of the inner starting point in the width direction, the root 66 substantially overlaps with the end of the cored bar 2 (2b) opposite to the circulating direction Cd, and protrudes from the vicinity of the inner end of the wing portion 22 toward the circulating direction Cd. And extends toward the end in the width direction while inclining to the side opposite to the circulation direction Cd. The root 66 overlaps with the cored bar 2 (2c) at a substantially longitudinal center of the wing part 22 in the cored bar 2 (2c) adjacent on the side opposite to the circulation direction Cd, and the buffer part 29 of the cored bar 2 (2c). The crawler main body 4 reaches the end in the width direction so as to overlap the whole.

Thus, the buffer part 29 of the cored bar 2 (2c) overlaps with the lug 6 (6a) in the circumferential direction. The elastic crawler 1 is formed such that the buffer portions 29 and 29 provided at the end portions in the longitudinal direction of the core metal 2 overlap with any of the lugs 6 in the circumferential direction.
The lugs 6,..., 6 are arranged symmetrically on both sides in the width direction in the elastic crawler 1, or are arranged in a staggered pattern alternately on one side in the width direction with respect to the respective engagement holes 41,. .

The tensile body 8 is formed by arranging a plurality of tensile cords such as steel cords in a line in the width direction. Each tensile body 8 is embedded in the crawler body 4 in a state where the outer peripheral side of the wing portion 22 in the core metal 2 is wound over the entire circumferential direction.
As described above, in the elastic crawler 1, each lug 6,..., 6 is embedded in the three core bars 2 (2 a), 2 (2 b), 2 (2 c) embedded in the crawler body 4 and arranged in the circumferential direction. The three core bars 2, 2, and 2 can support the external force that the lug 6 receives from the traveling surface when the crawler type traveling vehicle travels in a distributed manner. Therefore, the elastic crawler 1 is less deformed when traveling on rough terrain, and the occurrence of cracks at the end in the width direction is suppressed. Moreover, the crawler type traveling vehicle equipped with the elastic crawler 1 is reduced in vibration and noise during traveling.

  Further, the elastic crawler 1 is an intersection formed by two surfaces 30 intersecting the circulation direction Cd side of the inner peripheral surface of the longitudinal end of the core bar 2, that is, the side first contacting the traveling road surface. The end face near the end of the wing part 22, the outer peripheral surface, and the inner peripheral surface other than the buffer part 29 include intersection lines formed by intersecting two surfaces. It is formed so as to be continuous with a curved surface, and it is easy to occur at the longitudinal end portion of the cored bar 2 by considering that the stress concentration does not occur on the boundary surface of the rubber closely contacting the end portion of the wing portion 22. Prevents cracking of rubber.

Further, since the elastic crawler 1 is covered with hard rubber at the longitudinal ends of the wing portions 22, deformation of this portion of the crawler main body 4 is suppressed, and the risk of rubber cracking is reduced.
6 is a plan view of a cored bar 2B used for another elastic crawler, FIG. 7 is a perspective view of the vicinity of the end in the longitudinal direction of the wing part 22B of the cored bar 2B, and FIG. 8 is a right side view of FIG.

In the metal core 2B, the description of the portion having the same configuration as that of the metal core 2 in the elastic crawler 1 described above is omitted, and the same reference numerals as those of the metal core 2 are given in FIGS.
The cored bar 2B is different from the cored bar 2 in the shape of the buffer portion 29B. That is, the buffer portion 29B in the cored bar 2B is formed by bending the vicinity of the corner on one side in the width direction of the wing portion 22B at the longitudinal end of the wing portion 22B to the side where the protruding portion 26 protrudes. . The side surface Sf in the vicinity of the bent and inclined corner is a curved surface (R-shaped) having no corner formed by a surface whose end faces are orthogonal to each other.

  The buffer parts 29B and 29B in the cored bar 2B are provided on the same side in the width direction of the wing part 22B in the same manner as the buffered parts 29 and 29 in the cored bar 2. In the buffer portion 29B, both the surface 30B on the side from which the protruding portion 26 protrudes and the surface on the opposite side thereof are continuous with the flat plate-like portion 27 in the wing portion 22B. The wing portion 22B has at least an end face in the width direction continuous with the inner peripheral surface and the outer peripheral surface with a curved surface. Therefore, the surface of the buffer portion 29B is formed with a continuous curved surface.

  The buffer portion 29B has a width of 10 to 20 mm inward from the longitudinal end of the cored bar 2B, and is 3/3 of the width of the wing portion 22B from one end edge in the width direction to the other end edge. In the range of 1 to 2/3. The core metal 2B is designed so that the maximum inclination angle θ of the bent surface on the side surface shown in FIG.

The elastic crawler formed by embedding the cored bar 2B so that the buffer portion 29B is in the circulation direction Cd side on the inner peripheral side (the side that first contacts the traveling road surface) is the same as the elastic crawler 1, The occurrence of cracks in the rubber that is likely to occur at the end in the longitudinal direction of 2B is prevented.
In addition, the elastic crawler can also suppress the occurrence of cracks in the rubber by covering the longitudinal ends of the wing portions 22B with a hard rubber.

9 is a front view of a cored bar 2C used for another elastic crawler, FIG. 10 is a rear view of the cored bar 2C, and FIG. 11 is a right side view of FIG.
In the metal core 2C, the description of the portion having the same configuration as that of the metal core 2 in the elastic crawler 1 described above is omitted, and the same reference numerals as those of the metal core 2 are given in FIGS.
In addition to the buffer portions 29 and 29 provided on the side from which the protruding portions 26 and 26 protrude, the core metal 2C has a second buffer portion on the side opposite to the buffer portions 29 and 29 of the flat plate portions 27 and 27. It differs from the cored bar 2 described above in that it has 31C and 31C.

  The second buffer portions 31C, 31C rise from the longitudinal edges on the outer peripheral surfaces of the wing portions 22C, 22C in a thickness range of 10-20 mm inward in the longitudinal direction. The second buffer portions 31C, 31C on both sides in the longitudinal direction are continuous with the edge on the opposite side to the side on which the buffer portions 29, 29 are provided in the width direction of the core metal 2, and with respect to the width direction of the core metal 2. It is biased to one side. In the following description, the “second buffer portion 31C” includes a raised portion and a part of the flat plate-like portion 27 where the raised portion is located.

The surface 32 </ b> C on the rising side of the second buffer portion 31 </ b> C does not include an intersecting line formed by intersecting two surfaces. The surface of the second buffer portion 31C is formed with a continuous curved surface.
The second buffer portion 31C is formed on the surface of the wing portion 22 on the outer peripheral side of the elastic crawler 1 on the surface of the wing portion 22 from one edge in the width direction to the other edge. Of 2 or less.

The cored bar 2C is substantially circumferential in the crawler body 4 such that the protrusions 26 and 26 are on the inner peripheral side, and the buffer parts 29C and 29C are in the circulation direction Cd when the crawler type traveling vehicle is traveling. It is embedded at equal intervals.
For example, in the elastic crawler formed by embedding the core metal 2C as described above and having the lugs 6,..., 6 patterns (the shape and arrangement of the lugs 6) shown in FIG. The lug 6 is more likely to be deformed on the end side in the width direction when the vehicle travels backward (travels in the direction opposite to normal travel) (when the elastic crawler circulates in the direction opposite to the circulation direction Cd). On the other hand, in the above-described elastic crawler 1 shown in FIG. 1 and the like, the rubber thickness on the outer peripheral side of the end of the cored bar 2 in the width direction is large because it overlaps the lug 6 in the circumferential direction, and therefore stress relaxation is large. .

12 is a plan view of a cored bar 2D used for another elastic crawler, and FIG. 13 is a right side view of FIG.
In the metal core 2D, the description of the portion having the same configuration as that of the metal core 2 in the elastic crawler 1 described above is omitted, and the same reference numerals as those of the metal core 2 are given in FIGS.
In the core metal 2D, the rising portions of the buffer portions 29D and 29D are formed by a part of a sphere. That is, the surface 30D on the rising side of the buffer portion 29D passes through the same one point in the normal line in any part thereof. Similarly to the core metal 2C, the core metal 2D includes second buffer parts 31D and 31D that are arranged on the opposite side of the wing part 22D in the width direction with respect to the buffer part 29D and rise to the outer peripheral side. The second buffer portion 31D has the same shape as the buffer portion 29D, that is, a raised portion is formed by a part of a sphere.

The surface 30D and the surface 32D of the second buffer portion 31D are provided so that the size thereof is not less than 1/3 and not more than 2/3 of the width of the wing portion 22D in plan view (FIG. 12).
The cored bar 2D is substantially circumferential in the crawler body 4 such that the projections 26 and 26 are on the inner peripheral side and the buffering portions 29D and 29D are in the circulation direction Cd when the crawler type traveling vehicle travels. It is embedded at equal intervals.

The cored bar 2D may be configured without the second buffer parts 31D and 31D.
FIG. 14 is a plan view of a cored bar 2E used for another elastic crawler, and FIG. 15 is a right side view of FIG.
In the metal core 2E, the description of the portion having the same configuration as that of the metal core 2 in the elastic crawler 1 described above is omitted, and the same reference numerals as those of the metal core 2 are given in FIGS.

The cored bar 2E has buffer portions 29E and 29E that rise from the approximate center of the longitudinal ends of the wing portions 22E and 22E to one end in the width direction so as to rise in a certain range along the edge. Here, the “certain range” is a range of 10 to 20 mm from the edge of the wing portion 22E toward the inside in the longitudinal direction, and is one third or more of the width in the width direction of the wing portion 22E. The range is 2 or less. The surfaces 30E and 30E of the respective buffer portions 29E and 29E have a gentle skirt shape with surfaces 33E and 33E directed from the highest position toward the edge in the width direction of the wing portion 22E.

The cored bar 2E has second buffering portions 31E and 31E which are arranged on the opposite side in the width direction of the wing portions 22E and 22E with respect to the respective buffering portions 29E and 29E and rise to the outer peripheral side. The second buffer portion 31E is formed in the same shape as the buffer portion 29E.
The cored bar can be formed without the second buffer portions 31E and 31E in the cored bar 2E. The cored bar 2E is embedded in the crawler body 4 at substantially equal intervals in the circumferential direction so that the crest-like surfaces 33E and 33E of the buffer parts 29E and 29E are in the circulation direction Cd when the crawler type traveling vehicle travels. It is.

FIG. 16 is a view (right side view) corresponding to FIG. 5 in a cored bar 2F used for another elastic crawler.
In the metal core 2F, the description of the portion having the same configuration as that of the metal core 2B described above is omitted, and the same reference numerals as those of the metal core 2B are given in FIG.
The cored bar 2F has, in addition to the buffered parts 29B and 29B included in the cored bar 2B, a second buffered part 31F having the same shape as the buffered part 29B in the vicinity of the longitudinal ends of the wing parts 22F and 22F. The second buffer portion 31F is arranged on the opposite side of the wing portion 22F in the width direction with respect to the buffer portion 29F and is bent on the outer peripheral side. The side surface in the vicinity of the bent and inclined corner in the second buffer portion 31F is a curved surface (R-shaped) that does not have an angle at which the end surface is orthogonal.

FIG. 17 is a view of the elastic crawler 1 </ b> G viewed from the inner peripheral side.
In FIG. 17, the elastic crawler 1G includes a plurality of two types of cored bars 2Ga, 2Gb, a crawler body 4, lugs 6G,..., 6G, a pair of tensile bodies, and the like.
Each of the core bars 2Ga and 2Gb is formed of a hard material such as metal and has a substantially long shape as a whole. Further, the cored bars 2Ga and 2Gb have a protrusion-provided portion 21 at the center thereof, wing portions 22, 22 disposed on both sides in the longitudinal direction with respect to the protrusion-provided portion 21, and the protrusion-providing portion 21 and the wing portions 22, 22 are continuous. Any one of the first and second side protrusions arranged on the portion to be formed is configured by a pair of first side protrusions and second side protrusions. The protrusion-attached portion 21, the wing portions 22, 22, the first side protrusion, and the second side protrusion in the metal cores 2 Ga and 2 Gb have the same configuration as that in the metal core 2 of the elastic crawler 1. About these, the same code | symbol as the thing in the metal core 2 is attached | subjected in the following description and FIG. 17, and description is abbreviate | omitted.

The cored bars 2Ga and 2Gb are provided with buffer parts 29Ga and 29Ga or buffer parts 29Gb and 29Gb on the side (inner peripheral side) from which the protruding parts 26 and 26 protrude at the longitudinal ends of the wing parts 22 and 22, respectively. It has been.
Now, the cored bar 2Ga and the cored bar 2Gb are different in the positions of the respective buffer portions 29Ga and 29Gb.

  The buffer portions 29Ga and 29Ga in the cored bar 2Ga are provided at the end of the wing portion 22 so as to be biased toward one side in the circumferential direction in which the wheel running surface 34 of the closer projection 26 extends, and on the other side. The bump ends on the way to the edge. On the other hand, the buffer portions 29Gb and 29Gb in the cored bar 2Gb are biased at the end of the wing portion 22 to the side opposite to the one side in the circumferential direction in which the roller running surface 34 of the closer projection 26 extends. It is provided, and the bulge ends in the middle of reaching the end edge on the one circumferential direction side where the wheel running surface 34 extends.

  Since the wheel running surfaces 34, 34 of the pair of protrusions 26, 26 extend in different circumferential directions, the two buffer portions 29Ga, 29Ga in the core metal 2Ga are biased toward different sides in the circumferential direction. Are arranged. Similarly, the buffer portions 29Gb and 29Gb in the cored bar 2Gb are also arranged so as to be different from the two buffered portions 29Ga and 29Ga in the cored bar 2Ga in the circumferential direction and different from each other in the circumferential direction.

Each buffer part 29Ga, 29Ga, 29Gb, 29Gb is the same as the buffer part 29 in the core metal 2 and is one third of the width of the wing part 22 from one edge in the width direction of the wing part 22 toward the other edge. It is provided in the range of 2/3 or less. Further, it is preferable that the degree of swelling of the buffer portion 29 is 3 to 10 mm with respect to the flat portion 27.
In addition, each buffer part, like the buffer part 29B in the cored bar 2B, is a side (inner peripheral side) where the protruding part protrudes near one end (corner: corner) in the width direction at the end part in the longitudinal direction of the cored bar. ) May be bent.

The two types of core bars 2Ga and 2Gb are embedded in the crawler body 4 alternately in the circumferential direction so that the longitudinal direction thereof is the width direction of the crawler body 4.
The crawler body 4 is essentially the same as the crawler body 4 in the elastic crawler 1 described above. Therefore, the crawler main body 4 includes engagement holes 41,..., 41 penetrating the inner peripheral side and the outer peripheral side at the center in the width direction between the adjacent cored bars 2Ga, 2Gb. Further, rubber having a higher hardness than the other portions is used around the longitudinal ends of the wings 22 and 22 of the core bars 2Ga and 2Gb in the crawler body 4.

Each lug 6G,..., 6G protrudes from the outer peripheral surface of the crawler body 4 and is formed as a block extending toward the end in the width direction on either side of the engagement hole 41 in the width direction. The lugs 6G,..., 6G on both sides in the width direction are alternately arranged in a staggered manner on one side and the other side in the width direction with respect to the engagement holes 41,.
Next, the shape of the lug 6G will be described.

  The lug 6G has a width (a size in the circumferential direction) up to the vicinity of the engagement holes 41, 41 aligned with the engagement holes 41 on both sides in the circumferential direction on the side of the width direction of one engagement hole 41. The main body 4 extends to the end in the width direction orthogonal to the circumferential direction as a whole. The lug 6G extends substantially perpendicular to the circumferential direction to the end in the width direction, and the lug 6 of the elastic crawler 1 extends from the inside in the width direction to the end in the width direction while inclining to one side in the circumferential direction (see FIG. 1)).

The ground contact end surface 61G that is in contact with the ground when the lug 6G travels has the largest width (the width in the circumferential direction) on the side of the engagement hole 41 on the side in the width direction, and the width decreases as the end of the crawler body 4 is approached. ing. The lug 6G overlaps the core bars 2Ga and 2Gb adjacent in the circumferential direction in the circumferential direction.
The lug 6G having such a shape is substantially plane-symmetric with respect to a plane dividing the circumferential center in the width direction.

  In the elastic crawler 1G, attention is paid to how the core bars 2Ga and 2Gb adjacent to each other in the circumferential direction and the lug 6G overlap in the circumferential direction. That is, the cored bars 2Ga and 2Gb are arranged such that these buffer portions 29Ga and 29Gb are both biased to the side away from the ground end face 61 of the lug 6G in the circumferential direction. That is, in the elastic crawler 1G, the buffer portions 29Ga and 29Gb of the cored bars 2Ga and 2Gb that overlap the specific lug 6G on the one side in the width direction are close to each other at the tips of the adjacent wing portions 22 and 22. Instead of being located at the corners of the side, it is considered that they are located at the corners that are separated from each other.

  In the elastic crawler 1G, the lugs 6G,..., 6G arranged in the circumferential direction are provided in a staggered manner in the width direction, and the respective buffer portions 29Ga and 29Gb are arranged so as to be biased toward different sides in the circumferential direction. Since the two types of cored bars 2Ga and 2Gb are alternately embedded in the circumferential direction, the above-described lug 6G and the two cored bars 2Ga and 2Gb can be overlapped in a specific circumferential direction.

The elastic crawler 1G has a shape of the lug 6G and the buffer portions 29Ga and 29Gb of the two metal cores 2G and 2G that overlap the lug 6G in the circumferential direction, as shown in FIG. It is substantially plane-symmetric with respect to the plane dividing in the direction. For this reason, the elastic crawler 1G is mounted on the crawler type traveling vehicle without considering the circulation direction.
The elastic crawlers are not arranged such that the lugs 6G,..., 6G are staggered in the width direction like the elastic crawler 1G, but the lugs on both sides in the width direction are arranged at the same position in the circumferential direction. It may be arranged as follows. In this case, the cored bar is provided with a buffering part that is biased to the same one side in the circumferential direction at the end of the wing part. The cored bar adjacent to the end is opposed to the end opposite to the buffer portion, and this is alternately repeated in the circumferential direction and embedded in the crawler body.

Like the elastic crawler 1G, the elastic crawler formed in this way overlaps the core bars 2Ga and 2Gb adjacent to the specific lug on one side in the width direction, and buffers each core bar Can be formed so as to be positioned at the corners on the side away from each other at the tips of the adjacent wings 22, 22.
In general, there are cases where the cracks of the elastic crawlers generated when the crawler-type traveling vehicle rides on a curbstone or the like starts from the ground contact side, or bends from the inner peripheral side to the ground contact side and starts cracking from the inner surface side. Considering the thickness on the metal core end on the ground side and the inner peripheral side, it is preferable that the metal core end close to the inside of the lug is built up on the ground side. This is because when both ends of the metal core are bent toward the inner peripheral side, they become stress concentration points against reverse bending on the inner surface side, and are easily damaged.

  In the above-described embodiment, the configuration of the elastic crawlers 1 and 1G in which the core bars 2, 2B to 2F, 2Ga, and 2Gb are embedded is embedded in other core bars 2, 2B to 2F, 2Ga, and 2Gb in different combinations. It can be an elastic crawler. For example, the cored bars 2B to 2F can be arranged in the crawler main body 4 as shown by the elastic crawler 1 in FIG. 1 with respect to the positional relationship with the lugs 6,. Further, in the elastic crawler, rubber having a hardness higher than that of other portions of the crawler body is provided around the longitudinal ends of the wing portions 22B to 22E of the core bars 2B to 2F (see the portion corresponding to AR in FIG. 2). May be used.

The present invention can be applied to an elastic crawler that does not have the tensile bodies 8 and 8, and the same effect as the elastic crawler 1 can be obtained.
In the elastic crawlers 1 and 1G, the engagement holes 41 are formed so as to penetrate the inner peripheral side and the outer peripheral side. However, the engagement holes are simply formed as concave holes without penetrating the inner peripheral side and the outer peripheral side. It may be formed.

  In addition, each structure of the elastic crawlers 1 and 1B and the core bars 2, 2B to 2F, 2Ga, and 2Gb, or the entire structure, shape, dimensions, number, material, and the like can be appropriately changed in accordance with the spirit of the present invention. .

  INDUSTRIAL APPLICABILITY The present invention can be used for an elastic crawler mounted on a crawler type traveling vehicle and embedded with a core metal.

FIG. 1 is a view of the elastic crawler viewed from the inner peripheral side. 2 is a cross-sectional view taken along line AA in FIG. FIG. 3 is a plan view of the cored bar. FIG. 4 is a side view of the cored bar. FIG. 5 is a right side view of FIG. FIG. 6 is a plan view of a core bar used in another elastic crawler. FIG. 7 is a perspective view of the vicinity of the end in the longitudinal direction of the wing portion of the cored bar. FIG. 8 is a right side view of FIG. FIG. 9 is a front view of a core bar used in another elastic crawler. FIG. 10 is a rear view of the cored bar. 11 is a right side view of FIG. FIG. 12 is a plan view of a core bar used in another elastic crawler. FIG. 13 is a right side view of FIG. FIG. 14 is a plan view of a core bar used in another elastic crawler. FIG. 15 is a right side view of FIG. FIG. 16 is a view corresponding to FIG. 5 in a core bar used for another elastic crawler. FIG. 17 is a view of another elastic crawler when viewed from the inner peripheral side.

1,1G elastic crawler 2, 2B-2F, 2Ga, 2Gb cored bar 4 crawler body 6, 6G lug 29, 29B-29F, 29Ga, 29Gb buffer part 30, 30B-30F (buffer part) surface 31C-31F second Buffer part (second buffer part)
Cd Circulation direction Sf (side of buffer)

Claims (9)

An elastic crawler whose circulation direction is designated when mounted on a crawler type traveling vehicle,
A crawler body formed in an endless belt shape with rubber;
A plurality of lugs that are arranged at intervals in the circumferential direction of the crawler body and project from the outer peripheral surface of the crawler body and extend from the inside in the width direction of the crawler body toward the edge in the width direction;
A plurality of cored bars embedded in the crawler body at intervals in the circumferential direction,
The core metal is
In the vicinity of the corners on the same side in the width direction at both ends in the longitudinal direction, the buffer portion or the corners bulging thickly on the inner peripheral side of the crawler body are formed by being bent toward the inner peripheral side of the crawler body. A buffer section ,
In the vicinity of the corner on the opposite side to the side where the buffer portion is provided in the width direction at both ends in the longitudinal direction, the second buffer portion or the corner bulging thickly on the outer peripheral side of the crawler body is the crawler. A second buffer part bent on the outer peripheral side of the main body ,
The elastic crawler, wherein the buffer portion is disposed in the crawler body so as to be positioned on the circulation direction side when circulating in the circulation direction. The buffer portion is
It is a curved surface with no corners due to the intersection of the side surfaces near the corners that are raised or bent so as not to include the intersection line formed by the intersection of the two surfaces on the surface.
The elastic crawler according to claim 1 . The second buffer part is:
It is a curved surface with no corners due to the intersection of the side surfaces near the corners that are raised or bent so as not to include the intersection line formed by the intersection of the two surfaces on the surface.
The elastic crawler according to claim 1 or 2. The core metal is
The elastic crawler according to any one of claims 1 to 3 , wherein the buffer portions at both ends in the longitudinal direction are arranged so as to overlap any of the lugs in the circumferential direction . The buffer portion formed by bending the corner to the inner peripheral side of the crawler main body,
5. The maximum inclination angle θ of the bent surface when the core bar is viewed from the outside in the longitudinal direction is 15 degrees or more and 45 degrees or less . 5. Elastic crawler. The elastic crawler according to any one of claims 1 to 5 , wherein rubber having a higher hardness than other portions of the crawler body is used around both ends of the core metal in the longitudinal direction . The core metal is
The elastic crawler according to any one of claims 1 to 6, wherein the second buffer portions at both ends in the longitudinal direction are arranged so as to overlap any of the lugs in the circumferential direction . The elasticity according to any one of claims 1 to 7, wherein the lug is inclined from an inner side in the width direction to an opposite side of the circulation direction and extends toward an end edge in the width direction. Crawler. A crawler body formed in an endless belt shape with rubber;
A plurality of core bars embedded in the crawler body at intervals in the circumferential direction of the crawler body;
Ends in the width direction that are spaced apart from each other in the circumferential direction and project from the outer peripheral surface of the crawler body and are substantially perpendicular to the circumferential direction from the inside in the width direction on both sides in the width direction of the crawler body. Formed with a plurality of lugs extending toward the edge,
The core metal is
Near the corner on either side of the width direction at both ends in the longitudinal direction, the buffer portion or the corner that bulges thick on the inner peripheral side of the crawler body is bent to the inner peripheral side of the crawler body Having a buffered portion,
A part of each of the core bars adjacent in the circumferential direction overlaps with one of the lugs in the circumferential direction, and the buffer portions of the adjacent core bars overlapping with the one lug are positioned far from each other. So arranged and formed
An elastic crawler characterized by that .
And a plurality of lugs extending toward the end edge in the direction,
The metal core is
Near the corner on either side of the width direction at both ends in the longitudinal direction, the buffer portion or the corner that bulges thick on the inner peripheral side of the crawler body is bent to the inner peripheral side of the crawler body Having a buffered portion,
A part of each of the core bars adjacent to each other in the circumferential direction overlaps with one of the lugs in the circumferential direction, and the buffer portions of the adjacent core bars that overlap with one of the lugs are positioned far from each other. An elastic crawler characterized by being arranged in the manner described above.