JP2001151167A - Track shoe for crawler belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a track shoe for crawler belt having high stability and high durability. SOLUTION: This track chose comprises a contact part where the elastic body of an elastic track shoe makes contact with the ground surface of a rigid track shoe in the state where the elastic track shoe is simply combined with the ground surface of the rigid track shoe and a clearance part where a clearance is generated between the elastic body and the ground surface of the rigid track show in this state. In the state where a nut is fastened with a prescribed torque, the elastic body in the contact part is pressed, and the clearance part is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crawler track having elasticity which is mainly used for construction of hydraulic excavators and cranes, civil engineering machines and the like.

[0002]

2. Description of the Related Art Construction machines traveling on crawler tracks
In civil engineering machines, iron-made rigid shoes are usually used in many cases. The crawler crawler track is, for example, an upper swing hydraulic excavator 1 shown in FIG. 13, in which a track frame 3 provided on the left and right sides of a lower traveling body 2 (the left and right tracks have the same configuration, so one crawler frame is used here). 3 only), an idler 4 arranged at one end of
An endless track crawler belt 8 is wound around a traveling motor 5 disposed at the other end, a lower roller 6 disposed at a lower part, and an upper roller 7 disposed at an upper part.
As shown in FIG. 14, the endless track crawler 8 has a plurality of iron links 9 connected by pins 10, and a rigid crawler plate 11 is fastened to the links 9 by bolts (not shown).

According to the crawler track provided with the rigid crawler, an extremely loud striking sound is generated when traveling on a pavement due to the contact between the ground contact surface of the rigid crawler and the road surface. At the same time, the rigid footboard may severely damage the road surface. In recent years, with the increase in construction work in urban areas, for example, construction machinery such as hydraulic shovels and crawler cranes, noise during traveling,
Interest in protecting the road surface has increased. For this reason, various crawler tracks having various low noise and road surface protection functions have been considered.

One type is called a rubber crawler, in which the entire crawler belt is formed of an elastic material such as rubber reinforced with a cored bar and a wire, and is excellent in terms of low noise and road surface protection. I have. On the other hand, as in the endless track crawler provided with the above-mentioned rigid crawler, the iron links are connected to each other with pins, and the rigid crawler is fastened to these links with bolts to form an endless crawler crawler. A rubber crawler made entirely of an elastic material such as rubber with respect to the plate is uneasy in terms of strength, so the rubber crawler itself is often worn and damaged,
Further, there has been a problem that it is difficult to partially repair the device. Also, when a rubber crawler that has been significantly worn or damaged is discarded, it leads to a social problem of increasing industrial waste, and there is a movement to reuse rubber of the rubber crawler. Rebuilding rubber crawlers buried in the city was costly and often difficult in practice.

[0005] Another type is called an elastic shoe. This is made by directly bonding an elastic shoe with an elastic body such as rubber to form a grounding surface directly on a commonly used iron rigid shoe, such as by baking, or an elastic shoe with a cored bar. Then, the rigid shoes are fastened one by one to each other with bolts or the like. In any case, the structure is such that an elastic body such as rubber is arranged on the grounding surface using a rigid footboard,
A structure in which a rigid track plate is fastened to a track link by bolts can be used as it is, which is advantageous in terms of strength. In the case of partial damage, it can be replaced in units of one track plate. However, in the case of the elastic footwear of the type which is baked on the inner rigid footwear, when the elastic body is worn, it is necessary to replace it with the rigid footwear, which is disadvantageous in terms of cost. In recent years, there has been an increase in the number of types in which elastic footboards are separately manufactured and detachably attached to rigid footwear boards (FIG. 15).

[0006]

However, the following problems still exist in construction machines equipped with conventional elastic footwear. That is, for example, the aforementioned excavator 1
When the excavation work is performed by the work machine 50 or a heavy lifting object (not shown) is attached to the tip of the work machine and a heavy object is suspended, the work is locally applied to the crawler plate located below the lowermost roller 6a located at the forefront end. Load is applied. At this time, the lower roller 6a
When there is a ground contact surface of the elastic shoe plate 12 directly below, the entire elastic shoe plate 12 can receive a load. However, as shown in FIG. In the state where the lower roller 6a is provided, a load is locally applied to the end of the contact surface of the adjacent elastic shoe plate, and the elastic shoe plate is partially largely deformed, and as a result, the sinking of this portion is large. Therefore, the hydraulic excavator itself did not step on itself, the static stability was deteriorated, and the traveling vibration was large due to the drop of the lower roller 6a.

In the conventional elastic shoe shown in FIG.
The metal core 13 to which the elastic body 14 is fixed has reached the same height position as the frontmost and rearmost band-shaped projections 11a and 11b of the rigid shoe plate 11. For this reason, by the traction force for moving the construction machine acting in the front-back direction of the elastic footboard 12 in the front-back direction,
A shear force may act on the boundary between the top surfaces of the strip-shaped protrusions 11a and 11b and the elastic body on the ground surface side of the elastic body 12, that is, the position of the tip of the core bar 13, and cracks may occur.

In the conventional elastic shoe shown in FIG. 15, since the top surfaces of the belt-like projections 11a and 11b are not adhered to the contact surfaces at the ends of the elastic body, sand, pebbles and the like are not adhered. There is a possibility that the elastic body may enter between the contact surfaces and damage the elastic body. When the elastic body 14 is formed, a certain arc-shaped portion is formed at the corner of the end portion, and the rigid crawler plate 11 is usually formed by forging. Has an arc-shaped portion. There is also a problem that the two arc-shaped portions have a funnel-like action, and sand or pebbles are drawn between the contact surfaces.

An object of the present invention is to solve the above-mentioned various problems and to provide a more stable and durable elastic crawler track for crawler tracks.

[0010]

The present invention has a plurality of links, a rigid footboard fastened to each of the links by bolts, and an elastic footboard removably attached to a ground surface of the rigid footboard. Along with the endless track crawler track configured by connecting the plurality of links endlessly with pins, the elastic crawler plate has a core bar and an elastic body integrally fixed to the core bar, The elastic body is a hard first material.
An elastic layer and a second elastic layer softer than the first elastic layer, wherein the first elastic layer extends from a ground surface of the cored bar and / or the rigid shoe to a ground surface of the elastic shoe. And the second elastic layer is disposed at the front and rear ends in the traveling direction of the crawler track, and the second elastic layer is disposed in the first direction in the traveling direction of the crawler track.
It was arranged so as to be sandwiched between elastic layers.

According to this, even when a local load is applied to the lower roller near the upper portion of the pin connecting the link, even if a local load is applied to the lower roller, the front and rear ends of the adjacent elastic crawler plates are fixed to the metal core and the metal bar. And / or is formed of a hard elastic body from the rigid footwear plate to the ground contact surface, so that the elastic body has a small amount of elastic deformation. Stability is higher. In addition, the difference in the amount of sinking of the lower roller portion between the case where the ground contact surface of the elastic shoe plate is located immediately below the lower roller and the case where the lower roller is located near the above-mentioned pin is reduced, and the work of construction machinery and the like is reduced. The person can be engaged in the work without giving a sense of incongruity or anxiety.

[0012] Alternatively, the vehicle has a plurality of links, a rigid footboard fastened to each of the links by bolts, and an elastic footboard removably attached to a ground surface of the rigid footboard, respectively. In an endless track that is formed by connecting a plurality of links endlessly by pins, the track is turned in a direction in which the relative surfaces of the adjacent rigid or elastic shoes come close to each other around the pin that connects the adjacent links. Move, when the relative surfaces of the adjacent rigid footwear are in contact with each other, the minimum interval portion where the relative surface of the adjacent elastic footwear is minimized is continuous with the substantial ground contact surface of the elastic footwear, At the minimum interval portion, the opposing surfaces of the elastic footboard are prevented from contacting each other. Further, in this case, the minimum gap between the relative surfaces of the adjacent elastic shoe plates is a plane parallel to each other when the relative surfaces of the adjacent rigid shoe plates are in contact with each other, and the relative gap at the minimum gap portion is The distance between the surfaces is 1 to 10 m in a state where the elastic footboard is not elastically deformed.
m.

According to this, it is possible to reduce damage to the elastic shoe plate due to biting of sand or pebbles between the relative surfaces of the adjacent elastic shoe plates, and to ensure the maximum contact area of the elastic shoe plate. Can be. In other words, in order to reduce the sinking of the lower roller when a local load is applied to the lower roller in the state where the lower roller comes near the upper part of the pin connecting the link described above, it is necessary to use the elastic shoes adjacent to the lower roller. The smaller the distance between the relative surfaces of the boards is, the more advantageous it is. However, if the distance is carelessly reduced, the state in which the relative surfaces of the adjacent rigid or elastic shoes rotate in the direction approaching each other, so-called reverse In the retracted state, the relative surfaces of the elastic crawler plates come into contact with each other and become excessively compressed, and the friction at the contact portion caused by the compression deformation of the elastic body or the return from the deformed state, or the contact portion The elastic body is damaged by sand, mud, pebbles, etc., which are often bitten by the elastic body. According to the present invention, the interval between the relative surfaces of the adjacent elastic shoes is set to a minimum interval that does not cause a substantial problem, the damage of the elastic body is prevented, and the contact area of the elastic shoes is set as large as possible. By minimizing the distance between the contact surfaces of the adjacent elastic foot plates, better stability could be secured. In addition, the interval is 1 to 10
If the distance is selected as needed from the range of about mm, the effect of the present invention can be obtained even if the link pitch (the distance between the pins of the link) and the hardness of the elastic body are different within a range in which there is no practical problem. Experiments conducted by the applicant have confirmed that this is possible. It is needless to say that the numerical value range here includes a difference due to an error or the like generated during the manufacturing of the elastic body.
The substantial ground contact surface is a surface that comes into contact with a ground when a load is applied to the elastic shoe plate in a normal working state, and an arc-shaped portion formed near an end of the ground contact surface of the elastic shoe plate. Chamfers and chamfers are considered to be substantial treads.

[0014] In this case, the elastic shoe plate has a minimum distance of about 1/2 to 3/3 of a vertical distance from the contact surface of the elastic shoe plate to the contact surface of the rigid shoe plate in the relative surface.
4 and the range from the contact surface of the rigid shoe plate to the minimum gap portion is formed so as to rise substantially perpendicularly to the contact surface of the rigid shoe plate. It is possible to stably increase the amount of the elastic body of the elastic crawler plate and increase the amount of the elastic body as much as possible, thereby reducing the amount of elastic deformation of the elastic crawler plate, thereby further increasing the stability. Was completed.

[0015] Alternatively, the vehicle further comprises a plurality of links, a rigid footboard fastened to each of the links by bolts, and an elastic footboard detachably attached to a ground surface of the rigid footboard, respectively. In an endless track crawler belt formed by connecting a plurality of links endlessly by pins, the rigid crawler plate has a plurality of width-direction band-shaped protrusions protruding toward a ground contact surface, and the elastic crawler plate includes a metal core. And an elastic body integrally fixed to the metal core and forming a grounding surface of the elastic shoe plate, wherein the metal core has an uneven shape of the ground surface of the rigid shoe plate formed by the band-shaped projections. The top surface of the frontmost and rearmost band-shaped projections of the plurality of band-shaped projections are covered with only the elastic body without being covered with the core, and the front end of the core and The rear end is the foremost And each of the band-shaped projections rearmost was not reach the height of the top surface.

According to this, the boundary between the elastic body of the portion fixed to the cored bar generated when the construction machine or the like to which the present invention is applied travels and the elastic body on the grounding surface side of the elastic footwear plate therefrom. And the shear force at the boundary between the elastic body located between the belt-shaped protrusions whose deformation in the front-rear direction is suppressed by the band-shaped protrusions and the elastic body on the grounding surface side of the elastic footwear plate. Since the two boundary portions do not coincide with each other, the two boundary portions are distributed and received at the respective boundary portions, so that cracks generated in the elastic body can be prevented, and the durability can be improved.

[0017] Alternatively, the vehicle has a plurality of links, a rigid footboard fastened to each of the links by bolts, and an elastic footboard detachably attached to a ground surface of the rigid footboard, respectively. A plurality of links are connected endlessly by pins, and the rigid crawler is an endless track crawler having a plurality of width-direction band-shaped protrusions protruding toward a ground contact surface, wherein the elastic crawler includes a cored bar, An elastic body integrally fixed to the core metal and forming a grounding surface of the elastic shoe plate; a non-rotatably fixed to the core metal; a head buried in the elastic body; And a bolt protruding in a mounting direction to the rigid shoe plate, and inserting the bolt through a bolt hole formed in the rigid shoe plate to place the elastic shoe plate on the ground surface of the rigid shoe plate. combination,
Further, the elastic shoe is attached to the rigid shoe by tightening a nut to a thread portion of the bolt with a predetermined torque, and only the elastic shoe is combined with the ground surface of the rigid shoe. In the, has a gap between the bottom surface of the elastic footwear and the ground surface of the rigid footwear,
When the nut is tightened with a predetermined torque, the gap is substantially eliminated.

For example, in the state of being combined only, the vicinity of the front end portion and the rear end portion (or the left and right end portions) of the elastic shoe plate is brought into contact with the grounding surface of the rigid shoe plate, and a part of other portions or A gap is provided so as not to make contact with the whole, and the elastic shoe is fastened to the rigid shoe with a predetermined torque so that the gap is eliminated. Thereby, the vicinity of each end is firmly pressed against the rigid shoe plate, and it is possible to prevent sand, mud, pebbles, and the like from entering from the contact surface between the rigid shoe plate and the elastic shoe plate. In addition, it is possible to prevent the elastic crawler from being damaged by sand or the like that has invaded the contact surfaces. In addition, during running of a construction machine or the like to which the present invention is applied, a portion where a high stress is locally generated in the elastic body of the elastic footboard near the contact surface between the rigid footboard and the elastic footboard and this acts as a shearing force. However, by providing the gap portion in this portion, the elastic body can be made to be in a state where it is not compressed even after fastening compared to other abutting surface portions, and the shear force is received by the elastic force of the elastic body, so that the elastic body is damaged. Can be prevented.

In this case, in a state in which the elastic footboard is only combined with the ground contact surface of the rigid footboard, the vicinity of the outer end of the top surface of the frontmost and rearmost strip-like projections of the rigid footboard and the elasticity of the elastic footboard are determined. While the contact surface of the body is in contact with the elastic body from the vicinity of the inner end of the top surface to the corners, in the state of being tightened with the nut,
If the gap is substantially eliminated, when the construction machine to which the present invention is applied travels, it is possible to prevent sand, mud, pebbles, or the like from intruding between the rigid crawler and the elastic crawler. It is possible to prevent the elastic shoe plate from being damaged by sand or the like that has entered the abutting surface, and to generate shearing generated in the elastic body of the elastic shoe plate facing the vicinity of the inner corner of the top surface of the belt-like projection of the rigid shoe plate. The force can be received by the elasticity of the elastic body as in the case described above, and damage can be prevented.

[0020] Alternatively, the vehicle further comprises a plurality of links, a rigid shoe plate fastened to each of the links by bolts, and an elastic shoe plate detachably attached to a ground surface of the rigid shoe plate. In an endless track crawler belt formed by connecting a plurality of links endlessly by pins, the rigid crawler plate has a plurality of width-direction band-shaped protrusions protruding toward a ground contact surface, and the elastic crawler plate includes a metal core. And an elastic body integrally fixed to the metal core and forming a grounding surface of the elastic shoe plate, wherein the metal core has an uneven shape of the ground surface of the rigid shoe plate formed by the band-shaped projections. The top surface of the frontmost and rearmost band-shaped protrusions of the plurality of band-shaped protrusions is not covered by the core metal but is covered only by the elastic body, and each of the top surfaces is Outside in the front-back direction Near the portion, near the end of the elastic body facing the top surface, each has an arc-shaped portion in a direction away from each other, when a predetermined load is applied to the grounding surface side of the elastic footwear, Due to the elastic deformation of the elastic body, the arc-shaped portion at the end of the elastic body warps and comes into contact with the vicinity of the outer end of the top surface.

Normally, a rigid footwear plate formed by forging is
Some arc-shaped portions are formed at the corners for reasons of manufacturing process and strength, and this can be naturally applied to the band-shaped projections. Similarly, when forming the elastic body of the elastic shoe plate, an arc-shaped portion is formed at the corner, but the elastic body can easily adjust the arc radius of the arc-shaped portion. In the present invention,
Since the shape of the arc-shaped portion of this elastic body was deformed so that the arc-shaped portion was warped under a load due to the weight of a construction machine, etc., the shape was adapted to conform to the arc-shaped portion of the arc-shaped portion of the band-shaped projection. As in the past, the arc-shaped part of the band-shaped projection and the arc-shaped part of the elastic body are combined to form a funnel,
It is possible to prevent sand, mud, pebbles, and the like from being guided between the top surface of the belt-shaped protrusion and the elastic body, thereby preventing damage to the elastic shoe plate.

Further, a boundary position between a flat portion of the top surface of the strip-shaped projection and an arc-shaped portion near an outer end of the top surface,
The boundary position between the flat portion of the elastic body facing the top surface and the arc-shaped portion at the end of the elastic body is made to coincide with each other, and the arc shape near the outer end of the top surface of the band-shaped projection is set. When the arc radius of the arc-shaped portion at the end of the elastic body is smaller than the arc radius of the portion, the above-described operation can be more remarkably obtained. That is, since the two boundary positions are matched, and the arc radius of the arc-shaped portion at the end of the elastic body is smaller than the arc radius of the band-shaped projection, the elastic body can be extended to near the end of the top surface of the band-shaped projection. As a result, the contact surface of the elastic footboard could be obtained as much as possible without any problem in strength. If the arc radius of the arc-shaped portion of the elastic body is made larger than the arc radius of the band-shaped projection, when the end of the elastic body warps due to the load, it will protrude outside the top surface of the band-shaped projection, When a load is applied to this part, the elastic body that has become a cantilever beam is greatly deformed, and a shearing force acts on the fulcrum of this beam, not only damaging the elastic body but also making the construction machine itself uniform. However, according to the present invention, such a state can be prevented.

[0023] Alternatively, the vehicle further comprises a plurality of links, a rigid footboard fastened to each of the links by bolts, and an elastic footboard removably attached to a ground surface of the rigid footboard. In an endless track crawler belt formed by connecting a plurality of links endlessly by pins, the rigid crawler plate has a mud hole perforated near the center in the width direction, and the elastic crawler plate includes: A through hole smaller than the mud hole was formed in the rigid shoe plate at a position facing the mud hole.

Conventionally, a hole is also formed in the elastic shoe plate at a position corresponding to the mud hole formed in the rigid shoe plate, and the hole is deposited on the rear surface (the side to which the link is attached) of the rigid shoe plate. There is a type of mud that can be discharged even when an elastic footboard is attached. However, when such a through hole is formed in the elastic footboard, the amount of the elastic body of the elastic footboard decreases, and when the load is applied, the elastic body is deformed so as to escape to the through hole, so that the elastic footboard is sufficiently treaded. Can not get. In the present invention, since the through hole of the elastic shoe plate is made smaller than the mud hole of the rigid shoe plate, mud can be discharged, and the decrease in the amount of the elastic body is minimized to obtain a sufficient elastic body tread. Was made possible.

[0025]

FIG. 1 shows an embodiment of the present invention.
This will be described with reference to FIG. Components that are the same as those in the prior art are denoted by the same reference numerals. FIG. 1 is a view showing a lower traveling body 2 'to which a tracked track for an endless track according to the present invention is mounted. In FIG. 1, reference numeral 8 'denotes an endless track with an elastic crawler plate attached thereto, and reference numeral 20 denotes an elastic crawler plate.

FIG. 2 is a schematic view showing a state in which an elastic crawler plate 20a constituting a first embodiment of a crawler crawler crawler is attached to a rigid crawler plate 11, and portions not particularly described are the same as those in FIG. It is. In the figure, 20as is an elastic layer,
20ah is an elastic layer harder than 20as, and 21 is a metal core.

FIG. 3 is a view showing an elastic crawler plate 20b constituting a second embodiment of the crawler crawler crawler. In the drawing, reference numeral 22 denotes a ground contact surface of the elastic footboard 20b, and reference numeral 23 denotes a rigid footboard 1b.
The one ground contact surface 24 is the frontmost end of a plurality of band-shaped projections formed on one rigid footwear plate 11 (the traveling direction is not constant in a revolving construction machine such as a hydraulic shovel, but here, 2).
4 is the front end), 25 is the rearmost band, 26 is an intermediate band, 27 is the top of the band 24, 28 is the top of the band 25, and 29 is the top of the band 26. The top surface, 30 is the minimum distance between the relative surfaces of the adjacent elastic shoes 20b, 20b, L is the distance between the relative surfaces 30-30, H
Is the distance in the height direction between the top surface 27 of the belt-like projection 24 and the grounding surface 22; h is the length in the vertical direction from the grounding surface 22 of the minimum spacing portion 30;
A vertical portion of 0b, 32 is an elastic body of the elastic shoe plate 20b, and 51 is a relative surface of the adjacent rigid shoe plates 11,11. FIG.
In the second embodiment shown in FIG.
9 is a view showing a horizontal state. In the drawing, L 'is the distance between the adjacent ground contact surfaces of the elastic footboards of the minimum space portions 30-30.

FIG. 5 shows a third example of the endless track track of the present invention.
It is a figure showing elastic cuff 20c which constitutes an embodiment. In the drawing, reference numeral 33 denotes a metal core, reference numeral 34 denotes a bolt which is non-rotatably attached to the metal core 33, and a bolt for detachably fastening the elastic shoe plate to the rigid shoe plate, 35 denotes a nut, and 36 denotes a rigid shoe plate 11. The valley surface between the band-shaped projections of the reference numeral 37 is the front end of the cored bar 32, 3
8 is a rear end portion of the core bar 32, 48 is a bolt hole, and A is a valley surface 35.
From the top surface 28 (or 2) of the band-like projection 25 (or 24).
The height up to 7), a is the rear end 3 of the metal core 33 from the valley surface 35 in a state where the elastic shoe plate 20c is fastened to the rigid shoe plate 11.
8 (or the front end 37).

FIG. 6 shows the elastic shoe plate 20c of FIG.
It is a figure which shows the state before being fastened with the nut 35 only combined with one grounding surface. In the figure, S1 to S3
Are gaps formed between the elastic crawler 20c and the vicinity of the top surfaces 27 to 29, S4 is a gap formed between the elastic crawler 20c and the valley 36, and 39 to 42 are the gaps formed between the elastic crawler 20c and the top. 43 is a contact portion between the rigid shoe plate 11 and 43, a contact portion between the end portion of the elastic shoe plate 32 and the top surface 27, and 44 is a contact portion between the end portion of the elastic shoe plate 32 and the top surface 28.
Contact part.

FIG. 7 is a view showing an elastic crawler board 20d according to a fourth embodiment which is a modification of FIG. In the figure, 32 '
Is an elastic body, 33 'is a cored bar, and S1' to S4 'are gaps respectively corresponding to S1 to S4 in FIG. FIG.
FIG. 8 is a diagram showing a state in which the elastic shoe plate 20d of FIG. In the figure, 37 'is the front end of the core bar 33', 38 'is the rear end of the core bar 33', and a 'is the elastic body 3.
The height from the valley surface 35 in a state where 2 ′ is fastened to the rigid shoe plate 11 to the rear end 38 ′ (or the front end 37 ′) of the core bar 33 ′.

FIG. 9 is a view showing an elastic shoe plate 20e according to a fifth embodiment which is a further modification of FIG. In the figure, 3
2 ″ is an elastic body, 33 ″ is a core metal, and S1 ″ to S4 ″ are S
These are gaps corresponding to 1 to S4, respectively.

FIG. 10 is an enlarged view of a main part of a portion B in FIG. In the drawing, 45 is an arc-shaped portion formed at the outer end of the top surface of the belt-shaped projection 24, 46 is an arc-shaped portion formed at the end of the elastic body 32, R is the radius of the arc-shaped portion 45, and r is the arc A radius 47 of the shape portion 46 is a radius stop portion of the arc-shaped portions 45 and 46. FIG. 11 is a diagram illustrating a case where a predetermined load such as a running load acts on the elastic crawler board of FIG. 10.

FIG. 12 is a plan view showing an elastic shoe plate 20f according to a sixth embodiment of the present invention. The side view (not shown) is the same as that of FIG.
Through holes 70 and 71 are formed substantially at the center in the left-right direction of 0f. The through holes 70 and 71 are formed at positions corresponding to the mud holes 72 and 73 formed in the rigid shoe plate 11.

With reference to FIGS. 1 to 12, the structure and function of the crawler track according to the present invention will be described. Immediately below the lower roller 6a at the forefront in FIG. 1, there is a pin 10 for connecting adjacent links 9. In this state, the excavator 1 shown in FIG.
When a heavy lifting object (not shown) is attached to the tip of the working machine 50 and a heavy object is hung, the body of the excavator 1 is balanced with the lower roller 6a on the side to which the load is applied as a fulcrum. Means that a large load is applied. Note that the traveling motor 5 and the sprocket 4 are set so that the lower end positions thereof are slightly higher than the lower roller 6a in order to ensure the ability to get over obstacles and the like.

In the prior art, as shown in FIG.
Since the elastic shoe plate 12 does not exist below the pin 10, the vicinity of the end of the ground contact surface of the elastic shoe plate 12 is greatly deformed, and the lower roller 6a falls down. According to the elastic crawler track 20a of the crawler track of one embodiment, an elastic body is formed by the relatively hard first elastic layer 20ah and the first elastic layer 20as. The elastic layer 20ah is the second elastic layer 20
The as is sandwiched between the front end and the rear end of the elastic shoe plate.
As a result, the hard first elastic layer 20ah has a small amount of deformation even under the same load conditions as in FIG. 16, and the drop of the lower roller 6a is reduced, whereby the hydraulic excavator works effectively and the static stability is reduced. Was good. Here, in the present embodiment, the first elastic layer 2 formed of synthetic rubber
A hardness of 0 ah is about Hs86 to Hs96, and similarly, a hardness of the second elastic layer formed of an elastic body such as synthetic rubber or natural rubber is about Hs80 to Hs85. It has been confirmed from the results of various experiments conducted by the applicant that the weight and working conditions of hydraulic excavators, track-type cranes, and other construction and civil engineering machines to which the track track track of the present invention is applied are applied. Therefore, these hardnesses should be appropriately selected, and the present invention is not limited only to these numerical values.

In the second embodiment shown in FIGS. 3 and 4, a pin 10 connecting adjacent links 9, 9 is centered.
When the relative surfaces 51, 51 of the adjacent rigid shoe plates 11 or the relative surfaces (30, 30 or 31, 31) of the elastic shoe plates 20b rotate in the approaching direction, and the relative surfaces 51, 51 come into contact with each other, the elastic surface A minimum interval portion 30 of the relative surface of the footwear plate 20b,
The interval L of 30 was configured to be about 1 to 5 mm in a state where the elastic shoe plate 20b was not elastically deformed. In this state, the minimum gap portions 30, 30 of the relative surfaces are substantially parallel surfaces, and this is the closest portion of the adjacent elastic crawler plate 20b.
Also, the top surface 27 (28) of the band-shaped projection 24 (25) of the rigid shoe plate from the end of the minimum gap portion 30 on the rigid shoe plate 11 side.
The shape of the end face up to was made to rise vertically to the top face 27 (28).

According to this, since the end surface of the elastic shoe plate rises vertically from near the outer end of the top surface of the belt-like projections 24 and 25, the covering area of the elastic shoe plate with respect to the surface area of the ground contact surface 23 of the rigid shoe plate 11 is obtained. Can be increased, the amount of the elastic body on the contact surface 23 can be increased, and the contact area of the contact surface 22 of the elastic shoe plate 20b can be increased as much as possible. Accordingly, when the lower roller 6 is located near the upper portion of the pin 10 connecting the adjacent links 9 and the lower roller 6 is locally loaded, the sinking of the lower roller 6 is caused by the adjacent elasticity. Since the distance L 'between the footwear boards at the ground contact surface can be reduced, it can be naturally reduced.

According to this theory, the contact surface 2 of the rigid footboard
If the front end face (rear end face) of the elastic footwear is vertically raised from the front end (rear end) of the elastic footwear 3 toward the ground contact surface 22 of the elastic footwear, the normal running state or the maximum It can be imagined that the depression of the lower roller 6a when a large load is applied to the lower roller 6a at the front end is suppressed. However, if a crawler climbs over a stone or slacks in the crawler track 8 'during running, the crawler track 8' is in a reverse warped state as shown in FIG. At this time, if the interval between the adjacent elastic footboards 20b is small, the elastic footwear boards come into contact with each other and repeatedly compressively deform each time the warp state occurs, thereby promoting the fatigue of the elastic body constituting the elastic footwear boards 20b. Also, friction occurs, and if sand, mud, pebbles, or the like are caught between the elastic shoes, they bite into the elastic shoes, causing early damage. Even when the distance between the relative surfaces of the elastic footwear plate is set to be zero or very small, the elastic body constituting the elastic footwear plate 20b is slightly advantageous because the compression amount is smaller than that in the above-mentioned case. The state in which sand, mud, pebbles, etc. are bitten during the rubbing state similarly occurs, resulting in damage.

For this reason, as shown in FIG. 3, this maximum reverse warp state (ie, the relative surfaces 51, 51 of the rigid crawler plate 11).
Are in contact with each other), the minimum interval portions 30, 30 of the relative surfaces of the adjacent elastic shoe plates 20b become parallel surfaces, and the interval L is a minimum value 1 to which the function of the present embodiment can be exhibited.
The end face was formed so as to be about 10 mm. As a result, sand, mud, pebbles, and the like can be prevented from being damaged by biting, and L ′ in FIG. 4 can be minimized. Incidentally, the numerical value of about 1 to 10 mm is determined by the applicant's repeated experiments to determine the link pitch (pin 1 of link 9).
Even if the distance between 0, 10) and the hardness of the elastic body constituting the elastic shoe plate are changed within a range in which there is no practical problem, the function of the present embodiment can be obtained by adjusting the interval L within the range of approximately this numerical value. It is confirmed that it can be done. That is, in the present embodiment, by setting the minimum gap portions 30 and 30 to the minimum value that does not make contact, the gap L ′ between the adjacent ground planes 22 in a state where the link 9 is horizontal is ensured while maintaining durability. Could be minimized.

According to the third embodiment of the present invention shown in FIG. 5, the elastic shoe plate 20c is formed by
26 has a metal core 33 formed in an uneven shape substantially opposite to the uneven ground surface formed by the valley surface 36,
The elastic body 32 is integrally fixed to the metal core 33, and a front end portion 37 and a rear end portion 38 of the metal core 33 are provided.
Is lower than the heights of the top surfaces 27 and 28 of the frontmost band-shaped projection 24 and the rearmost band-shaped projection 25 of the plurality of band-shaped protrusions, respectively. More specifically, the valley surface 3 of the rigid crawler plate 11
The relationship between the height a from 5 to the rear end 38 of the core bar 33 and the height A from the valley surface 36 to the top surface 28 of the rigid crawler plate 11 is a
<A was set.

According to the present embodiment, the belt-like projections 24, 25
The belt-like projections 24 whose deformation in the front-rear direction is slightly restricted by
A boundary between the elastic body at a portion closer to the core metal 33 than the top surfaces 27 and 28 of the elastic member 25 and an elastic body at a portion where the deformation in the front-rear direction of the elastic footboard 20c from the top surfaces 27 and 28 is not restricted by external force. A first shear force occurs near. Further, the elastic body 32
Is integrally fixed to the metal core 33 by bonding, and since this metal core is fastened to the rigid shoe plate 11 by the bolts 34 and the nuts 35, the portion of the portion which is bonded to the metal core 33 and restricted in lateral deformation is A second shearing force is generated near the boundary between the elastic body and the elastic body on the ground contact side of the elastic crawler plate 11 from the front end portion 37 and the rear end portion 38 of the cored bar 33. In this way, the elastic footboard 20c
The shearing force acting on the elastic body 32 is generated by being dispersed at two places, and damage to the elastic body 32 can be prevented.
If the front end and the rear end of the cored bar are higher than the top surfaces 27 and 28 of the strip-shaped projections, an excessive load may be applied to the front end and the rear end of the cored bar, and the cored bar may be deformed. Since the shearing force also acts from the side close to the ground contact surface, the shearing force concentrates on the elastic body near the front end and the rear end of the metal core, which is inconvenient.

FIG. 6 shows a state in which the elastic shoe plate 20c shown in FIG. 5 is simply combined with the ground contact surface of the rigid shoe plate 11 before the elastic shoe plate 20c is fastened to the rigid shoe plate 11 by the bolts 34 and the nuts 35. FIG. 6 is a diagram showing a state where only a bolt is inserted into a bolt hole. In such a state, of the grounding surface of the rigid crawler board 11, near the inner corner of the top surface 27 of the belt-like projection 24, near the inner corner of the top surface 28 of the belt-like projection 25, and near the top surface 29 of the belt-like projection 26. There are gaps S1, S2, S3 and S4 near the top surface and near the valley surface 36, respectively. That is, in the front-back direction, the elastic crawler plate 20c is positioned by the contact portions 39 to 41 abutting against the side wall of the band-shaped protrusion, and in the height direction, the end portions of the elastic crawler plate 20c and the band-shaped protrusion The temporary positioning is performed by the top surfaces 27 and 28 of 24 and 25 abutting on each other. When the nut 35 is tightened to a predetermined torque with respect to the bolt 34 from this state, the gaps S1 to S4 are almost eliminated. That is, the contact portion 4
The elastic bodies 32 constituting the 3,44 elastic footboards 20c are pressed against and pressed against the top surfaces 27,28, respectively.

According to this, the front end and the rear end of the elastic shoe plate 20c are respectively connected to the top surfaces 27, 2 of the belt-like projections 24, 25.
8, the elastic body 32 of the elastic shoe plate 20c can be pushed away from the contact portions 43, 44 at the ends to prevent sand, mud or small stones from entering. In addition, the elastic body 32 near the gaps S1 and S2 is a place where a particularly high stress is generated (a section where the above-described shearing force is generated).
When the elastic cuff 20c is fastened to the rigid cuff 11 by S1, S2, the elastic body 32 in the vicinity of the gaps S1, S2 is in a state of being not much compressed. For this reason, this stress (shearing force) can be received with a sufficient margin by the elasticity of the elastic body 32, and damage such as generation of a crack can be prevented.
Note that, as is clear from FIG.
The position in the height direction is also determined by the side walls 26 to 26, but this is such that when the nut 36 is tightened to the bolt 34 with a predetermined torque, the core metal is deformed within the range of elastic deformation. It has been set.

FIGS. 7 and 8 show an elastic crawler plate 20d constituting a crawler crawler crawler according to a fourth embodiment of the present invention, which is a modification of FIGS. 6 and 5, and FIGS. 5 has almost the same function as that of FIG. 5, and the gaps S1 ′ to S4 ′ are eliminated by tightening the nut 36 to the bolt 34. 37 ',
38 'and a' have substantially the same functions as 37, 38 and a in FIGS. In the present embodiment, the core metal 33 'is embedded in the elastic body 32' in the elastic crawler board 20d. Since the cored bar 33 ′ is often made of an iron material, rust may be generated when the cored bar 33 ′ is exposed, and the rust may cause the bonded portion of the elastic body to peel off. According to the present embodiment, the core metal is the elastic body 3
Since it is buried in 2 ', it does not rust.

FIG. 9 shows an elastic crawler 20e according to a fifth embodiment of the present invention, which is a further modification of FIG. 7, in which gaps S1 "to S4" are used to tighten a nut 35 to a bolt 34. Is lost. According to the elastic crawler plate 20e, the core metal 33 ″ has a shape covering the upper portions of the top surfaces 36, 37 of the band-shaped projections 24, 25. According to the present embodiment, the above-described shearing force is dispersed. Although it does not have the function of receiving, the core bar 33 "can firmly press the front end and the rear end of the elastic body 32" by the top surfaces 27 and 28, respectively. Other functions are the same as those described above. The same is true.

FIG. 10 shows the elastic crawler plate 20 (20) shown in FIG.
a to 20e) is an enlarged view of a main portion of a front end portion in a state where the front end portion is fastened to the rigid shoe plate 11, and as shown in the figure, the vicinity of the outer end portion of the top surface 27 has an arc shape with a radius R. In general, this is an arc shape inevitably generated in the process of a rigid shoe plate formed by forging. On the other hand, the end of the elastic body 32 of the elastic footboard 20 facing the end also has a slightly arcuate shape in the process of forming the elastic body 32, but the mold for forming the elastic body is better than in the case of forging. Since processing is easy, the radius r of the arc shape is also easily adjusted. In the present embodiment, the radius of the two arc-shaped portions is R> r, and the radius r is, as shown in FIG. The shape portion 41 is set to warp and contact the arc shape portion 40 side.
6 and a boundary between the arc-shaped portion 40 and a boundary between the flat portion of the elastic body facing the top surface 36 and the arc-shaped portion 41, a boundary position 42.
To match.

When the contact surface 22 of the elastic shoe plate 20 is not in contact with the ground, the arc radius r of the arc-shaped portion 41 at the end of the elastic shoe plate 20 is reduced, so that the funnel formed by the arc-shaped portions 40 and 41 is formed. Although the shape is smaller than the prior art, it exists. However, when the grounding surface 22 of the elastic crawler plate 20 comes into contact with the ground during traveling, the arc-shaped portion 41 warps and comes into contact with the arc-shaped portion 40, so that the funnel shape is almost eliminated as shown in FIG. No mud or pebbles are guided between the top surface 36 and the elastic body 32. Moreover, since the boundary position 42 can be set as far as possible from the outer end, the contact surface 22 of the elastic crawler 20 can be made large. In addition, although there are some before and after depending on the size of the rigid footwear to be applied, according to the results of experiments conducted by the applicant, the radius R is about 3 to 5 mm and the radius r is about 1 to 2 mm. It has been confirmed that the function of the present invention can be exhibited by selecting and setting as required.

According to the sixth embodiment of the present invention shown in FIG. 12, the mud holes 72, 7 of the rigid shoe plate 11 of the elastic shoe plate 20f are provided.
At positions corresponding to No. 3, through holes 70 and 71 are formed. The mud holes 72 and 73 of the rigid shoe plate 11 are
Links 9, 9 attached to the back of the vehicle in parallel in the front-rear direction
It has the function of discharging mud and the like that accumulates between them, but this function will be lost if the corresponding hole is not formed in the elastic footwear plate. Conversely, if holes of the same size as the mud holes 72 and 73 are formed, the absolute amount of the elastic body constituting the elastic footwear with respect to the surface area of the ground contact surface of the rigid footwear 11 is reduced, and unnecessary space is created. As a result, a phenomenon occurs in which the elastic body escapes toward the hole, and as a result, the amount of deformation of the elastic crawler plate becomes large and the treading becomes poor, and in the hydraulic excavator 1 to which this is applied, the stability decreases. I do. In the present embodiment, the through holes 70, 71 formed in the elastic shoe plate 20f corresponding to the mud holes 72, 73 are set to be the same as or slightly smaller than the smaller mud holes 72. Without losing the function of the holes, minimizing the escape of the elastic body into the through holes 70, 71, and securing the absolute amount of the elastic body at a constant level, the stepping on a level that does not cause any functional problem And secured stability.

[0049]

The effects of the crawler track according to the present invention will be described below.

According to the first aspect of the present invention, the vicinity of the end of the elastic shoe is firmly pressed against the rigid shoe, so that sand, mud, or mud from the contact surface between the rigid shoe and the elastic shoe. It is possible to prevent pebbles and the like from entering, and it is possible to prevent damage to the elastic shoe plate due to sand and the like entering these contact surfaces.
In addition, during running of a construction machine or the like to which the present invention is applied, a portion where a high stress is locally generated in the elastic body of the elastic footboard near the contact surface between the rigid footboard and the elastic footboard and this acts as a shearing force. However, by providing the gap portion in this portion, the elastic body can be made to be in a state where it is not compressed even after fastening compared to other abutting surface portions, and the shear force is received by the elastic force of the elastic body, so that the elastic body is damaged. Can be prevented, and the durability can be improved.

Further, according to the second aspect of the present invention, since the gap is set at a location where a high stress is generated, the effect of the first aspect of the invention can be effectively obtained.

Further, according to the third aspect of the present invention, the elastic body of the portion fixed to the core bar generated when the construction machine or the like provided with the present invention runs and the grounding surface side of the elastic footboard therefrom The shear force at the boundary between the elastic body and the elastic body located between the belt-like projections whose longitudinal deformation is suppressed by the belt-like projections and the boundary between the elastic body and the elastic body on the grounding surface side of the elastic footboard And the shearing force at the boundary are dispersed and received at the respective boundary portions, so that cracks generated in the elastic body can be prevented, and the durability can be improved.

According to the fourth aspect of the present invention, the through hole of the elastic shoe is made smaller than the mud hole of the rigid shoe.
The construction machine to which the present invention is applied can discharge mud, minimize the decrease in the amount of the elastic body, obtain sufficient elasticity, and increase the static stability of the construction machine, etc. Etc. can be improved.

As described above, according to the present invention, it is possible to improve the durability of the crawler track for crawler tracks, improve the stability of construction machines and the like equipped with the track, and reduce running vibration. Thus, the working efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a view showing a lower traveling body to which a track plate for an endless track according to the present invention is mounted.

FIG. 2 is a view showing a first embodiment of the crawler track of FIG. 1;

FIG. 3 is a view showing a second embodiment of the crawler crawler track of FIG. 1;

FIG. 4 is a diagram showing a state in which the links are horizontal in the crawler track of FIG. 3;

FIG. 5 is a view showing a third embodiment of the crawler track of FIG. 1 which is an embodiment of the present invention.

FIG. 6 is a diagram showing a state where the elastic crawler is simply combined with the rigid crawler before the elastic crawler is fastened to the rigid crawler in the crawler crawler track of FIG. 5;

FIG. 7 is a view showing a fourth embodiment of the crawler track for crawler tracks, which is a modification of FIG. 5;

8 is a diagram showing a state in which an elastic crawler is fastened to a rigid crawler in the crawler crawler of FIG. 7;

FIG. 9 is a view showing a fifth embodiment of the crawler track for crawler tracks, which is a modified example of FIG. 7;

FIG. 10 is an enlarged view of a main part of a portion B in FIG. 1;

11 is a diagram showing a case where a load acts on an elastic crawler of the crawler crawler crawler of FIG. 10;

FIG. 12 is a plan view showing a sixth embodiment of the crawler crawler track of FIG. 1;

FIG. 13 is a view showing a hydraulic excavator to which the crawler crawler according to the present invention or the prior art is applied.

14 is an enlarged view of a main part of the lower traveling body of FIG. 13,
It is a figure showing the state where an elastic crawler board is not attached.

FIG. 15 is a diagram showing a track track for crawler tracks according to the prior art.

FIG. 16 is an enlarged view of a main portion showing a case where a load is applied to a crawler crawler track of the related art.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Hydraulic excavator 2, 2 'Lower traveling body 5 Traveling motor 6, 6a Lower roller 8, 8' Endless track crawler 9 Link 10 pin 11 Rigid footboard 12, 20, 20a, 20b, 20c, 20d, 20f
Elastic crawler 13,21,33,33 ', 33 "Core 24,25,26 Belt 27,28,29 Top surface 30 Minimum interval 31 Vertical portion 32 Elastic body 34 Bolt 35 Nut 36 Valley surface 39,40 , 41, 42, 43, 44 Contact portions 70, 71 Through holes 72, 73 Mud removal holes S1, S2, S3, S4, S1 ', S2', S3 ', S
4 ', S1 ", S2", S3 ", S4" gap

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Seiichi Tanaka 3-12-4 Gion, Asaminami-ku, Hiroshima-shi, Hiroshima

Claims (4)

[Claims] 1. A plurality of links and each of said links
The rigid footboard fastened by bolts and the rigid footboard
An elastic footboard that is detachably attached to the ground
And the links are endless by pins.
And the rigid shoe plate is a composite
In the crawler track having a number of widthwise belt-like projections,
The elastic shoe plate has an elasticity that forms a contact surface of the elastic shoe plate.
Body, a core metal embedded in the elastic body,
And the head is fixed to the elastic body.
The threaded part is located in front of the rigid footboard in the mounting direction.
And a bolt protruding from the elastic body and fixed to the cored bar.
The threaded part of the bolt
The elastic footboard is inserted into the
And a bolt screw fixed to the cored bar
By tightening the nut to the part with the specified torque
The elastic footboard is attached to the rigid footboard, and
Only the above-mentioned elastic shoe is combined with the contact surface of the rigid shoe.
In the state of the above, the elastic body of the elastic footboard and the grounding of the rigid footboard
A contact portion where a surface contacts, and in this state, the elastic body and the rigid body
A gap is created between the tread and the ground
When the nut is tightened to a predetermined torque,
The elastic body at the contact portion is pressed against
Crawler track for crawler tracks, characterized in that the gap is eliminated . 2. The foremost end of the rigid footwear plate,
Near the corner of the inside edge of the top surface
The crawler track according to claim 1, wherein the crawler track is provided . 3. The core bar is formed by the band-shaped projection.
Rigid footwear has an uneven shape corresponding to the uneven shape of the tread surface.
Formed at the forefront end and the rearmost end of the plurality of band-shaped projections.
The top surface of the band-shaped protrusion is not covered with the
Covered only by the body, the front and rear ends of said cored bar
Is the top surface of each of the frontmost and rearmost band-shaped projections.
Lower than the height position, the front end and the rear end of the elastic footboard
Part is located on the top surface of the foremost and rearmost strips
The crawler track according to claim 2, characterized in that: 4. The rigid footwear plate is located near a center in the width direction.
Having an open-cut mud hole, wherein the elastic shoe plate has the rigidity
At the position opposite to the mud hole on the crawler plate,
2. A small through hole is drilled.
The track plate for a crawler track according to any one of claims 1 to 3 .