JPH11268672A - Crawler core and flexible crawler using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To permit sufficient support of a body load without separation of the driving wheel from the external guide portion even when the driving wheel slips sideways by widening the wheel driveability range of the external guide portion. SOLUTION: An engaging portion 3 for the driving wheel is formed at the midway portion of a core body 2 which is long in the crosswise direction. An inner guide portion 4 is formed to the left and right sides of this engagement portion 3. An outer guide portion 5 having a traction surface P2 for vehicle drive is formed further to the outside than the left and right inner guide portions 4. A traction protruding portion which protrudes outside to the left and right further than both end portions is formed in the front/back direction at the midway portion of the left and right outside guide portions 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crawler core used for tracked vehicles such as construction, civil engineering, and agriculture, and an elastic crawler using the same.

[0002]

2. Description of the Related Art For example, elastic crawlers used for tracked vehicles such as backhoes, particularly elastic crawlers used in place of iron crawlers, are disclosed in Japanese Utility Model Publication No. 2-47101. A long metal core is buried in the crawler body formed in the right and left (width) directions at equal intervals in the front-rear (circumferential) direction, and an engaging portion through which a drive wheel passes is formed substantially in the center in the left-right direction of the crawler body. An inner guide portion through which the driven wheel passes is formed on the left and right sides of the joint portion, and an outer guide portion through which the rolling wheel passes outward from the left and right inner guide portions is formed.

In a backhoe or the like, in order to secure the stability of the vehicle body when working sideways, the rolling wheels are made to correspond to the outer guide portion,
The distance between the left and right treads is increased. The metal core used for the elastic crawler has a drive wheel engaging portion formed in the middle of the metal core body that is long in the left-right direction, and an inner guide portion is formed on both left and right sides of the engaging portion. An outer guide portion having a wheel rolling tread surface is formed outside the inner guide portion.

[0004]

In the above-mentioned prior art, the outer surfaces of the left and right outer guides are straight and form a long rectangular tread in the front and rear direction, so that the wheel rolling range in the left and right direction is limited. It is narrow. Therefore, when the rolling wheels are laterally displaced, it may be difficult to support the machine body load by detaching from the outer guide portion, so that the machine body becomes unstable and the elastic material portion is greatly damaged.

The core metal (elastic crawler) has a symmetrical shape, the left and right inner guides have the same front and rear length as the core metal body, the wheel rolling tread is short, and the vibration caused by the drop of the wheel is generated. In addition, the outer guide part has a longer front and rear length on both the left and right sides than the core metal body. Occurs, and the weight is increased.

In view of such various problems, the present invention forms a tread protruding portion projecting left and right outward from both ends at a longitudinally intermediate portion of the left and right outer guide portion, thereby providing a vehicle in the left and right direction. An object of the present invention is to provide a crawler core metal capable of sufficiently supporting a machine body load even when a rolling wheel is laterally displaced, and an elastic crawler using the same.

According to the present invention, one of the left and right inner guides is formed by a long inner projection, and the other is formed integrally with the crawler body by an elastic material. The outer guide portion is formed by a long outer protrusion, and the other outer guide portion is formed by a shorter outer protrusion. Not only the guide part but also the outer guide part can reduce the weight, the weight balance between the left and right metal and rubber is improved, the pitch of the core metal body is reduced, vibration can be reduced and riding comfort can be improved, Moreover, it is an object of the present invention to provide a crawler core metal capable of supporting a rolling wheel by widening a rolling range of a wheel in the left-right direction and an elastic crawler using the same.

[0008]

A first concrete means for solving the problem in the core metal of the present invention is to form a driving wheel engaging portion 3 in the middle of a core metal body 2 which is long in the left-right direction, An inner guide portion 4 is formed on the left and right sides of the engagement portion 3, and an outer guide portion 5 having a wheel rolling tread surface P2 is formed outside the left and right inner guide portions 4. A tread protruding portion protruding left and right outward from both end portions is formed at a middle portion in the front-rear direction.

As a result, even if the tread surface P2 is widened in the left-right direction and the rolling wheel is shifted laterally, one of the rolling wheels rides on the tread protruding portion to support the body load and stabilize the body. The second concrete means for solving the problem in the core metal of the present invention is, in addition to the first concrete means, the left and right inner guide portions 4.
An inner protrusion 6 which is longer than the core metal body 2 in the front-rear direction is protruded from one side of the core metal body 2, and is longer than the core metal body 2 in the front-rear direction with the outer guide part 5 opposite to the long inner protrusion 6 and the engagement portion 3. An outer protrusion 7 is protruded, and an outer protrusion 8 shorter than the longer outer protrusion 7 is provided on the outer guide portion 5 on the same side as the longer inner protrusion 6. At the corresponding position, the tread protruding portion 7a,
8a.

As a result, the weight of the core bar 1 can be reduced not only by the left and right inner guide portions 4 but also by the outer guide portions 5 to improve the right and left weight balance.
The wheels can be prevented from coming off, and the tread surface is wide even if the rolling wheels are shifted sideways, stabilizing the fuselage. A third specific means for solving the problem in the core metal of the present invention is that, in addition to the first or second specific means, the lower side of the outer projections 7, 8 connected to the core metal main body 2 is provided with ribs. That is, it is formed in a shape.

As a result, the outer guide portion 5 is connected to the outer projection 7,
8, the core metal weight can be reduced by stealing the lower side of the portion where the tread surface P2 is formed. A first concrete means for solving the problem in the elastic crawler of the present invention is to embed a large number of metal cores 1 long in the left-right direction at an interval in the front-rear direction in a crawler body 12 made of an elastic material. In the middle of the direction, the engaging portion 3, the inner guide portion 4 on the left and right sides of the engaging portion 3, and the wheel rolling tread surface P on the outer side of the left and right inner guide portion 4.
2 is formed, and a tread protruding portion protruding left and right outward from both ends is formed at a middle part in the front-rear direction of the left and right outer guides 5.

As a result, an elastic crawler 11 having a wide tread surface P2 in the left-right direction is obtained, and even if the rolling wheels are shifted laterally, any one of the rolling wheels rides on the protruding portion of the tread to support the machine body load.
Stabilize the fuselage. A second specific means for solving the problem in the elastic crawler of the present invention is, in addition to the first specific means, one of the left and right inner guide portions 4 protruding from the core metal body 2 and The other of the left and right inner guides 4 is formed integrally with the crawler body 12 using an elastic material, and the outer guides on the opposite side with the long inner protrusions 6 and the engaging portions 3 interposed therebetween. 5 is formed by an outer protrusion 7 protruding from the core metal body 2 and long in the front-rear direction, and the other outer guide portion 5 is formed by an outer protrusion 8 protruding from the core metal body 2 and shorter than the long outer protrusion 7. The tread protruding portions 7a and 8a are formed at positions substantially corresponding to the center of the outer protrusions 7 and 8 in the front-rear direction of the core metal body.

As a result, the elastic crawler 11 can reduce the weight of the core bar 1 not only in the left and right inner guide portions 4 but also in the outer guide portions 5 to improve the right and left weight balance. Even if the wheels pass through, the treads are wide even if the rolling wheels are shifted sideways, stabilizing the fuselage. A third specific means for solving the problem in the elastic crawler of the present invention is, in addition to the first or second specific means, a long outer projection 7 for connecting the metal cores adjacent to each other in the front-rear direction of the crawler body 12. That is, they are arranged so that left and right are reversed.

As a result, adjacent cores 1 have long inner projections 6 and long outer projections 7 arranged in a staggered manner, and long outer projections 7 of one core 1 face short outer projections 8 of adjacent core 1. In addition, the long inner projection 6 is opposed to a portion of the adjacent cored bar 1 where no inner projection is provided, and the pitch of the cored bar main body 2 can be reduced, thereby reducing vibration and improving ride comfort.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 12, reference numeral 20 denotes a crawler device such as a construction machine, and a sprocket-made driving wheel 21, a driven wheel 22, and a plurality of rolling wheels 23 and the like.
The elastic crawler 11 can be replaced with an iron crawler.

In the first embodiment shown in FIGS. 1 to 8, an elastic crawler 11 is provided on a crawler main body 12 formed of an elastic material such as rubber or synthetic resin by a metal at an interval in the front-rear (circumferential) direction. Alternatively, a metal core 1 made of synthetic resin is embedded, and a pair of left and right circumferential tensile members 24 made of steel cord or the like are embedded on the grounding surface side of the metal core 1. Engagement holes 17 are formed at substantially the center in the left-right (width) direction and between the metal cores 1 at substantially equal intervals in the front-rear direction, and lugs 25 are integrally formed on the ground surface side at equal intervals in the front-rear direction. Have been.

The mandrel 1 is embedded so that the meshing pitch with the drive wheel 21 is a long pitch, a short pitch or a semi-short pitch.
Are arranged to straddle. As shown in FIGS. 6 to 8, the metal core 1 embedded in the elastic crawler 11 forms a driving wheel engaging portion 3 in the middle of the metal core body 2 that is long in the left-right direction.
An inner guide portion 4 is formed on the left and right sides of the engaging portion 3, and an outer guide portion 5 having a tread surface P <b> 2 outside the left and right inner guide portions 4.
Is formed.

The metal core 1 has three protrusions 6, 7, and 8 projecting upward (inner peripheral side) from the metal core body 2, and one of the left and right inner guide portions 4 is arranged in the front-rear direction with respect to the metal core body 2. The outer guide portion 5 is formed by a long inner protrusion 6, and the outer guide portion 5 opposite to the long inner protrusion 6 with the engaging portion 3 interposed therebetween is formed by an outer protrusion 7 longer in the front-rear direction than the core metal body 2. The outer guide 5 on the same side as 6 is formed by an outer projection 8 shorter than the long outer projection 7.

The outer projections 7 and 8 of the cored bar 1 are formed higher than the inner guide portion 4 and the engagement portion 3 where the long inner projection 6 is not provided, and the tread surface P2 of the long outer projection 7 is 6
Is lower and wider than the tread surface P1. The outer projections 7 and 8 protrude left and right outward from both ends at a substantially central portion in the front-rear direction of the cored metal body 2 by a dimension L1. 8a. The tread protruding portions 7a and 8a have a chevron shape or a trapezoidal shape projecting left and right outward in plan view.

Tread surface P2 having tread protrusions 7a, 8a
Is a tread without the tread protrusions 7a and 8a (dimension L2)
The wheel rolling range is wider by the dimension L1, and the weight of the core metal is smaller than that of the rectangular tread having the dimension L3. As shown in FIG. 8, the long inner protrusion 6, the long outer protrusion 7, and the short outer protrusion 8 have center portions in the front-rear direction of the tread surfaces P1 and P2, respectively, having a middle height by dimensions T1 and T2, respectively. Can be done smoothly.

The metal core 1 has a vertical rib R shape in which a lower part connected to the metal core body 2 extends in the front-rear direction or the left-right direction with respect to the upper part forming the tread surfaces P1 and P2.
Since the lower portions of the treads P1 and P2 are stolen, the weight is reduced. The stealed portion contains an elastic material forming the crawler main body 12 to secure the connection with other portions and prevent the surface of the metal core 1 from being corroded.

A pair of left and right lateral regulating protrusions 27 and 28 are formed on the front and rear portions of the metal core 1 with the engaging portion 3 interposed therebetween.
The front and rear lateral regulation protrusions 27 and 28 have a tapered shape, and the left and right front lateral regulation protrusions 27 are wider than the left and right rear lateral regulation protrusions 28 in the horizontal direction. In the case of this cored bar 1, two types are prepared, one in which the cored bar 1 shown in FIG. 6 and the protrusions 6, 7, 8 are arranged left and right, and two types are alternately arranged in front and rear, and arranged in front. The left and right front lateral regulating projections 27 of the rear core 1 are arranged outside the left and right rear lateral regulating projections 28 of the cored bar 1 to restrict mutual left and right movement.

In the core 1, the left and right inner guides 4 are provided.
The inner projection is not provided on one of the outer projections, and one of the outer projections of the outer guide portion 5 is shortened, so that the weight of the core bar 1 is reduced. By forming the long outer projection 7 on the opposite side, the right and left weight balance is improved, and the long treads P1 and P2 can be formed, so that the wheel passing through the outer guide portion 5 can be stably supported by the tread P2. .

In FIGS. 1 to 5, the crawler 1 has an engagement portion 3 between the engagement holes 17 at a middle portion of the crawler body 12 in the left-right direction.
An inner guide portion 4 is formed on the left and right sides of the engagement portion 3 on the inner peripheral side, and an outer guide portion 5 is formed outside the left and right inner guide portions 4. Left and right inner guide 4
Has a first tread surface P on its upper surface so that the driven wheel 22 rolls.
The first tread P1 has a long tread and a short tread which form a pair in the left-right direction and are alternately formed in the front-rear direction.

The long first tread surface P1 is formed by the long inner protrusion 6 of the cored bar main body 2, and the short first treaded surface P1 is formed integrally with the crawler main body 12 of an elastic material, and is substantially the same as the front-rear length of the cored bar main body 2. The elastic projection 26 has a length. As shown in FIG. 3, the short elastic projection 26 is formed to be higher than the long inner projection 6 by a height H when there is no load, and is substantially the same as the long inner projection 6 when receiving a load from the rolling wheel 23 or the like. It will be elastically deformed to its height, elastically support the load and reduce vibration and noise. The height H is preferably in the range of 1 to 5 mm, and is usually set to 2 to 3 mm.

The left and right outer guide portions 5 have a second tread surface P2 formed on the upper surface thereof so that the rolling wheel 23 rolls, and the second tread surface P2 is a pair of a long tread surface and a short tread surface in the left-right direction. , And are formed alternately in the front-rear direction. Second tread P2
Is formed by a long outer projection 7 and a short outer projection 8 of the cored metal body 2, the long outer projection 7 protruding forward and backward from the cored metal body 2, and the short outer projection 8 is substantially the same as the front and rear of the cored metal body 2 The rubber surfaces around them are low and grooved.

The metal core 1 is arranged such that long outer projections 7 are arranged right and left opposite to each other in the front-rear direction of the crawler body 12, and the long inner projections 6 and the long outer projections 6 in the left-right direction. The projection 7 is located on the opposite side of the engagement portion 3, and the elastic projection 26 and the short outer projection 8 are also located on the opposite side of the engagement portion 3. In the front-back direction, each protrusion 6,
7, 8, and 26 are arranged in a zigzag pattern.
The long outer projection 7 faces the short outer projection 8 of the adjacent cored bar 1,
The long inner protrusion 6 of one core 1 faces the portion of the adjacent core 1 where there is no inner protrusion, and reduces the pitch of the core metal main body 2 to reduce vibration and improve ride comfort.

As described above, the long outer projections 7 (long treads) and the short outer projections 8 (short treads) are alternately arranged in the front-rear direction. When the crawler main body 12 is deformed so as to be inclined with respect to the orthogonal direction and the bending line adjacent in the front-rear direction becomes opposite to the inclined direction and along the rolling wheel 23, the twisting direction is a single direction. Rather, the left and right projections are alternately twisted, and even if the left and right projection valleys are narrowed, the metal does not hit each other. Even if the amount is increased to prevent vibration, no adverse effects such as derailing occur and the weight is reduced. Such a twist of the crawler body 12 also occurs when the driven wheel 22 passes through the first tread surface P1.

In the elastic crawler 11, since the elastic projection 26 is provided on one of the left and right inner guides 4 without the inner projection, the tread surface P1 can be formed while reducing the weight of the left and right inner guides 4. Even if an abnormal tension is generated due to a foreign object being caught during traveling, the elastic projection 26 is elastically deformed and damage to the elastic crawler 11 can be prevented. The shock at the time of hanging is reduced, and the noise is suppressed.

Further, by shortening one of the outer protrusions of the outer guide portion 5 and forming the longer outer protrusion 7 on the opposite side to the longer inner protrusion 6 with the engaging portion 3 interposed therebetween, the metal and rubber of the elastic crawler 11 are formed. The left and right weight balance is improved, and the long treads P1 and P2 can be formed, and the rolling wheel 23 passing through the outer guide portion 5 can be stably supported by the tread P2. Furthermore, the arrangement of the long inner protrusions 6 and the long outer protrusions 7 of the adjacent cored bar 1 in a staggered manner prevents the rolling wheels 23 from simultaneously fitting in the valleys of the front and rear outer protrusions, thereby reducing vibration. And improve ride comfort.

FIGS. 9 to 11 show a second embodiment of the present invention. The elastic crawler 11 is provided with a derailing prevention projection 16 for a rolling wheel on the left and right outer sides of the outer guide portion 5. The derailment prevention projection 16 is formed as a projection integrally projecting upward with the cored metal body 2, and is lower than the inner guide portion 4 and higher than the outer guide portion 5. It is preferable that the height of the derailing prevention protrusion 16 is 50% or more of the height of the inner guide part 4, so that the rolling wheel 23 is more reliably prevented from being derailed.

The long inner projection 6 has a recess 6a in the middle in the front-rear direction.
The elastic body 29 is embedded in the concave portion 6a and is integrated with the crawler body 12. The upper surface of the elastic body 29 has a height H similar to that of the elastic projection 26.
(About 1 to 5 mm), the upper surface of the long inner projection 6 (the tread surface P
It protrudes from 1) and enables reduction of vibration and weight.

The long outer projections 7 and the shorter outer projections 8 of the cored bar 1 are each formed with outwardly protruding portions 7a, 8a substantially at the center in the front-rear direction in a square shape. Further, the front and rear lateral regulating protrusion 2
The left and right front lateral regulation protrusions 27 are shifted to one side in the left and right direction, and the left and right front lateral regulation protrusions
Is shifted to the other side in the left-right direction, and the elastic crawler 11 can be configured only by inverting one type of the core bar 1 left and right and arranging it back and forth.

The present invention is not limited to the above embodiment, but can be variously modified. For example, the elastic crawler 11 may be a dedicated one that is not for changing shoes, and the long inner protrusion 6 is formed of an integral elastic material of the crawler body 12,
The protrusion 26 may be formed integrally with the cored metal body 2,
7, 8, 26 may be shifted in the front-back direction with respect to each other or with respect to the core metal body 2.

In the crawler device 20, the driven wheel 22 travels on the first tread P1 and the rolling wheel 23 travels on the second tread P2. However, the reverse is also possible. Both the driving wheel 22 and the rolling wheel 23 may run on the second tread surface P2, and the inner guide portion 4 may function as a protrusion for preventing wheel removal. In this case, the long inner protrusion 6 and the elastic protrusion 26 have an upper surface in a mountain shape. You may keep it.

[0036]

According to the cored bar and the elastic crawler of the present invention described in detail above, the rolling range of the right and left outer guide portions can be widened, and the load on the machine body can be sufficiently supported even if the rolling wheels are shifted sideways. Further, the weight can be reduced not only by the left and right inner guide portions 4 but also by the outer guide portions 5, and the right and left weight balance is improved.

[Brief description of the drawings]

FIG. 1 is a plan view seen from an inner peripheral surface showing a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is a partial cross-sectional side view.

FIG. 4 is a plan view of the elastic crawler as viewed from an outer peripheral surface thereof.

FIG. 5 is a perspective view of an elastic crawler.

FIG. 6 is a plan view of a cored bar.

FIG. 7 is a rear view of the cored bar.

FIG. 8 is a side view of a cored bar.

FIG. 9 is a plan view of the second embodiment of the present invention, viewed from the inner peripheral surface.

FIG. 10 is a sectional view taken along line YY of FIG. 9;

FIG. 11 is a partial cross-sectional side view.

FIG. 12 is a plan view showing a crawler device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Core metal 2 Core metal main body 3 Engagement part 4 Inner guide part 5 Outer guide part 6 Long inner protrusion 7 Long outer protrusion 7a Tread protruding part 8 Short outer protrusion 8a Tread protruding part 11 Elastic crawler 12 Crawler main body 16 Derailing prevention protrusion 26 Elastic protrusion P1 First tread P2 Second tread 22 Follower wheel 23 Rolling wheel

Claims (6)

[Claims] An engaging portion for a drive wheel is formed in a middle portion of a core metal body elongated in a left-right direction, and an inner guide portion is provided on a left and right side of the engaging portion. And an outer guide portion (5) having a wheel rolling tread (P2) outside of the left and right inner guide portions (4). A core metal for a crawler, wherein a tread protruding portion protruding outward left and right from both ends is formed. 2. An inner projection (6), which is longer in the front-rear direction than the core metal body (2), protrudes from one of the left and right inner guides (4).
An outer projection (7), which is longer in the front-rear direction than the core metal body (2), protrudes from the outer guide portion (5) on the opposite side of the long inner protrusion (6) and the engaging portion (3), and is provided with a long inner protrusion. An outer projection (8) shorter than the longer outer projection (7) is provided on the outer guide portion (5) on the same side as the projection (6), and the outer projections (7, 8) are substantially centered in the front-rear direction of the core metal body. The crawler core according to claim 1, wherein the tread protruding portions (7a, 8a) are formed at corresponding positions. 3. The crawler according to claim 1, wherein a lower side of the outer projections (7, 8) connected to the core metal body (2) is formed in a rib shape. Core metal. 4. A large number of metal cores (1) long in the left-right direction are buried in the crawler body (12) made of an elastic material at intervals in the front-rear direction, and an engaging portion is provided at an intermediate portion in the left-right direction of the crawler body (12). (3) an outer guide part (5) having an inner guide part (4) on the left and right sides of the engagement part (3) and a wheel rolling tread (P2) outside the left and right inner guide part (4). An elastic crawler characterized in that a tread protruding portion protruding left and right outward from both ends is formed at a middle part in the front-rear direction of the left and right outer guide part (5). 5. One of the left and right inner guide portions (4) is formed by an inner protrusion (6) protruding from the core metal body (2) and longer than the core metal body (2) in the front-rear direction. (4)
Is formed integrally with the crawler body (12) using an elastic material, and the outer guide section (5) on the opposite side of the long inner protrusion (6) and the engagement section (3) is sandwiched between the core body (2). An outer projection (7) protruding from the core metal body (2) and having a shorter outer projection (8) than the long outer projection (7). 5. The elastic crawler according to claim 4, wherein the tread protruding portions (7 a, 8 a) are formed at positions corresponding to substantially the center of the outer protrusions (7, 8) in the front-rear direction of the core metal body. . 6. The crawler body (12) according to claim 4 or 5, wherein core bars adjacent to each other in the front-rear direction of the crawler body (12) are arranged such that long outer projections (7) are left-right reversed. An elastic crawler as described.