JP2523838Y2 - Connecting link type rubber track - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting-link type rubber crawler suitable for being mounted on an iron crawler device of a mobile construction machine or the like.

[0002]

2. Description of the Related Art Conventionally, iron crawlers are mounted exclusively on mobile construction machines, and rubber shoes are used in some of them. Recently, rubber crawlers have become popular. FIG. 12 is a cross-sectional view of one example of a conventional iron crawler, where 101 is an outer brim rolling wheel, 102 is an iron crawler shoe, 102a is a shoe plate, 102b is a shoe link, 102c is a link pin, and 102d is a lug (iron). ). FIG. 13 is a sectional view of one example of a rubber shoe.
03 is a rubber shoe, 103a is a shoe plate, 103
b is a shoe link, 103c is a link pin, and 103d is a rubber lug. FIG. 14 is a cross-sectional view of a conventional rubber track, in which 104 is a rubber track, 104c is a lug,
05 is a core metal, 106 is a steel cord. Twelfth
In FIG. 14, all of the rolling wheels can also serve as the same outer brim rolling wheels. By the way, iron crawlers have a small vibration because track links are connected to the inner circumference to form a continuous rolling track, and there is little crawler disengagement because there is no elongation or phase shift in the circumferential and width directions. ,
It has advantages such as excellent durability due to large mechanical connection of each link etc., but on the other hand, it has large noise, poor cushioning and great driver fatigue, damages the road surface And the like.

On the other hand, rubber crawlers have low noise, good cushioning and low driver fatigue, do not damage the road surface, are relatively small in weight, and have the characteristics of running. It has the advantages of being able to increase the speed relatively, but has the disadvantage that the core metal projections protruding from the inner peripheral surface are used as rolling wheel tracks, so that the vibration is slightly large, and steel cord Is embedded in a slightly wavy shape, and the ends of the steel cord are only overlapped with a thin rubber layer interposed between them, so if the crawler stretches during abnormal tension, if external force is applied in the width direction The crawler may be dislocated due to the above reasons, and the mechanical strength of the rubber crawler is based on the adhesion between rubber and the core metal and steel cord. Since it is considerably less than the mechanical strength of the iron crawler,
In terms of durability, rubber crawlers have a problem that they are considerably inferior to iron crawlers.

On the other hand, a rubber shoe having a rubber lug on the ground side of a shoe plate of an iron crawler has the weakest adhesive force between the shoe plate and the rubber lug among iron crawlers having excellent mechanical strength. Because the rubber lugs are pressed between the rigid body (shoe plate) and the ground, and there is no escape, the damage is quick, and vulcanizing the rubber lugs to each shoe plate significantly increases the cost. However, there are disadvantages, such as the fact that they cannot be superior to rubber crawlers.

[0005]

SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned disadvantages of rubber crawlers, and does not solve the disadvantages of rubber crawlers by taking advantage of iron crawlers by adopting the structure of iron crawlers. Things. By the way, Japanese Utility Model Application No. 60-59128 (Japanese Utility Model Application Laid-Open No. 61-175)
No. 091) The rubber crawler to be invented is erected with a certain gap on the upper surface of a cored bar 17 embedded with a certain gap on the inner peripheral surface of a rubber crawler belt 16 formed in an endless belt shape. The front and rear ends of the left and right side walls (track links) 19 and 19 'are connected to the other side walls 19-1 and 19'-1 in a state of being overlapped with the other side walls 19-1 and 19'-1 in the form of a bendable endless chain via the insertion pin 22. It is.

However, as shown in FIG. 2 of this publication, the rubber crawler is located at a high position on the inner peripheral surface of the rubber crawler 16 and is separated from each other. In the part wound around the sprocket, the insertion pin fits into the sprocket and is wound tightly, while the rubber crawler body goes a large detour on the outside away from the insertion pin, and therefore the Excessive elongation strain occurs in the rubber crawler main body, resulting in extremely low durability.

[0007]

The feature of the present invention is to embed a metal core composed of flat left and right wing portions and a central portion at regular intervals in a circumferential direction in a rubber crawler body and to correspond to the left and right wing portions. A lug is projected on the outer peripheral surface, and a pair of track links is attached to both sides of the central portion of the metal core on the inner peripheral surface side, and each track link adjacent in the circumferential direction is connected back and forth to form an inner peripheral surface side. In a rubber crawler having a track formed by a pair of continuous track links on both sides of a central portion of the rubber crawler, a rubber crawler body between adjacent metal cores of the embedded metal core is formed into a curved portion that is curved so as to be higher toward the inner peripheral side, Another object of the present invention is to configure a position of a link pin for connecting adjacent track links within a curved portion of the rubber crawler body. The details of the present invention will be specifically described by the following examples.

[0008]

FIG. 1 shows a core 1 used in a first embodiment of the present invention, wherein A is a perspective view, B is a side view, and C is a top view. 1a is left and right wings, 1
b is a recessed central portion, p and p are bolt holes (through holes) provided on both sides of the central portion 1b, h is a step, and the central portion 1b is located at a position lower than the wing portion 1a. .

FIG. 2 shows a rubber crawler body 2 in which the metal cores 1 are embedded at regular intervals.
And C is a cross-sectional view taken along the line XX of FIG.
As shown in the figure, the left and right wing portions 1a, 1a
However, the bolt holes p and the periphery of the central portion 1b are not buried. Reference numeral 2a denotes a curved portion formed by bending the crawler main body between the wings 1a and 1a circumferentially adjacent to the core metal embedded in the rubber crawler main body so as to be raised toward the inner peripheral side, and 3 is continuous in the circumferential direction. As shown in the drawing, the reinforcing layer 3 is embedded in the lower part of the wing portion 1a and therefore has a wavy shape.
A lug protruding from the outer peripheral surface corresponding to a. FIG. 3 is a perspective view of the rubber crawler main body 2.

FIG. 4 shows one piece of the track link 5 used in the present embodiment, wherein A is a front view and B is a bottom view, which is used for some iron crawlers. It is the same as what you have. In the drawing, reference numeral 6 denotes a pin hole, and the interval 1 between the left and right pin holes 6, 6 is set to a dimension equal to the core bar interval, 7 is a window, 8 is a lower frame of the window 7,
p 'is a bolt hole for attaching the track link to the core metal center part 1b, and as shown in the figure, the bolt hole p'
Are penetrated from the upper surface 8a of the lower frame 8 to the lower surface f of the track link. In addition, the upper surface g of the track link is used as a wheel raceway as a plane. Note that the left and right pin holes 6 and 6 have thin portions (thickness t of 1) in opposite relations at the left and right positions.
/ 2), so that the connecting of the track pins before and after is performed in the same thickness state. In the connection, the bolt hole p 'and the central portion 1a of the cored bar are connected.
Bolt holes p and p 'that communicate with each other by matching
A pair of track links are erected on both sides of the central portion 1a by bolting, and the pin holes 6 of the front and rear track links are overlapped, and the link pins are rotatable between the overlapped pin holes. It is inserted into the state and connected to form a continuous wheel track. Here, k is a mounting bolt for connecting the track link and the core bar, and k 'is the same nut.

FIG. 5 is a partial view showing the track link 5 attached to the crawler body 2 of the present embodiment, wherein A is a front view, B is a cross-sectional view, and 9 is a link pin. As can be seen in the figure, according to the present invention, the position of the link pin of the connecting track link is located within the curved portion 2a of the rubber track body. Accordingly, the lug height and the rubber thickness (the rubber thickness from the lower surface of the wing portion 1a to the ground contact surface) of the lugs 4 and 4 become relatively large, so that the lug 4 has a large load below the wing portion 1a (rigid body). Even when the rubber shoe is pressed, the pressing force is dispersed to have a sufficient rubber thickness to extend the durability time greatly.In this embodiment, the problem seen in the rubber shoe does not occur. is there.

FIG. 6 is a view for explaining the connection link type rubber track of the present invention wound around a driving wheel or an idle wheel. In the winding portion, the outer peripheral side is extended from the line connecting the link pins 9, 9..., And the elongation rate increases as the distance from the line to the outer peripheral side increases. In this embodiment, if the elongation rate of this portion becomes large, fatigue due to repeated elongation accumulates and the durability is impaired. In this embodiment, the wing portion 1a and the central portion 1b of the cored bar are formed. Since the central portion 1b is lowered by providing a step h between them, the track link can be mounted at a relatively low position, and the curved portion 2a is provided between the cores of the crawler body. For this reason, this portion is raised to the inner peripheral side and becomes almost the same height as the link pin, so that it is hardly elongated even at the winding portion, and the problem of accumulation of fatigue does not occur.

If the crawler body between the metal cores is made of only rubber, this portion may ride on a protrusion on the road surface and be extremely stretched and damaged, so as to prevent this. The reinforcing layer 3 may be embedded. As the reinforcing layer 3, a high-strength woven fabric of natural or synthetic fiber or metal fiber, or a fiber cord of these fibers is used. A small number of steel cords may be used. The embedding position of the reinforcing layer 3 is preferably substantially the same as the height of the link pin in the crawler body between the metal cores for the above-described reason. If necessary, a plurality of reinforcing layers may be provided. It may be buried.

FIG. 7 shows a second embodiment of the present invention. FIG. 7A is a plan view of a cored bar 11 used in the embodiment, and FIG.
Is a plan view of the outer peripheral side of the rubber crawler body 21 of the present embodiment. As shown in FIG. A, the core metal 11 has left and right wing portions 11a, 11a in the shape of retreat wings with respect to a central portion 11b (retreat angle ∂). A lug 41 is provided on the outer peripheral surface corresponding to the portion 11a, and as shown in FIG.
A part of the lug 41 is located on the extension of, and there is almost no drop of the rolling wheel in this part,
Vibration during running is greatly improved.

FIG. 8 shows a third embodiment of the present invention. As shown in FIG.
a and 12a are formed in steps, respectively, and are buried in the rubber crawler body 22 in the same manner as in the above embodiment, and lugs 42 are provided on the outer peripheral surface corresponding to the wings 12a. As shown in FIG. B, a part of the lug 42 is located on the extension of the center line o of the link pin 9, and has the same effect as the second embodiment.

FIG. 9 shows a metal core 13 used in a fourth embodiment of the present invention, wherein A is a perspective view, B is a plan view,
C is a width side view and D is a longitudinal side view. In the figure, m and m are wing overhangs provided on the side surfaces near the center of the left and right wings 13a, 13a, and n and n are center overhangs provided on both sides of the center 13b, and the center overhang n Are provided with bolt holes p. Therefore, as shown in the figure, bolt holes p and p are provided at both sides of the central portion 13b with an interval l 'therebetween.

FIG. 10 shows one piece of the track link 51 used in the present embodiment, wherein A is a front view, B is a bottom view, and as shown in FIG. Are provided with bolt holes p ′, p ′, and the distance l ″ is equal to the bolt hole distance l ′ in the central part 13b.

FIG. 11 shows a rubber crawler according to the present embodiment.
FIG. 2 is a partial state view in which the track link 51 is attached, and as shown in the figure, the track link 51 is bolted at two places to the core metal center part 13b. FIG. B is a plan view of the outer peripheral side of the crawler main body 23. As shown in the figure, a lug extension 43m is provided on the side surface of the lug 43 in correspondence with the central extension m of the metal core 13, and the lug extension 43m is provided. Is located on the extension of the center line o of the link pin 9 of the track link 51,
For this reason, even at the link pin position, there is no drop of the rolling wheel, and the vibration during running is improved.

In the connecting link type rubber track of the present invention, the link pin is engaged with the driving wheel to transmit the driving force, and the central portion of the cored bar is independent of the root of the driving wheel. It can have any cross-sectional shape,
For this reason, the manufacturing cost of the core metal is relatively low. Also, the track link is convenient because a track link manufactured for a conventional iron crawler can be used.

[0020]

[Effects of the Invention] The rubber track of the present invention has a continuous rolling track by connecting a track link to the inner peripheral side.
The disadvantages of the conventional rubber track can be improved as follows. The running vibration becomes small. Crawler disengagement hardly occurs because circumferential elongation and lateral displacement do not occur. Since the mechanical coupling force of each link is large, durability is improved. It is also possible to omit the use of a steel cord which is indispensable for a conventional rubber track. Since the projection of the cored bar is not required, the cost can be reduced.

According to the present invention, there is substantially no elongational distortion in the winding portion around the driving wheel or the idler wheel, so that the problem of accumulation of fatigue does not occur, and the rubber crawler has excellent durability. In addition, the lug height and rubber thickness under the wing of the core metal become large, and as a result, the lug disperses the compressive force due to a large load and extends the durability time greatly, so that the durability time of the rubber crawler is greatly increased. It will be extended. In addition, according to the present invention, the track link is convenient because the track link used in a part of the conventional iron track can be used as it is. As a result, the excellent rubber track as described above is relatively simple and easy as a whole. It can be produced at low cost.

[Brief description of the drawings]

FIG. 1 is a perspective view of a core metal used in the present invention, wherein A is a perspective view,
B is a side view and C is a top view.

FIG. 2 is a crawler main body, where A is a plan view, and B and C are cross-sectional views taken along line XX and line YY of FIG.

FIG. 3 is a perspective view of a rubber crawler main body.

FIG. 4 shows a track link A used in the present invention.
Is a front view, and B is a bottom view.

FIG. 5 is a partial state view in which a track link is attached to a rubber track main body, where A is a front view and B is a cross-sectional view.

FIG. 6 is a view illustrating a state in which the connecting link type rubber track of the present invention is wound around a driving wheel or an idle wheel.

7 shows a second embodiment of the present invention, wherein A is a plan view of a cored bar, and B is a plan view of an outer peripheral side of a rubber crawler body. FIG.

FIG. 8 shows a third embodiment of the present invention, wherein A is a plan view of a cored bar, and B is a plan view of an outer peripheral side of a rubber crawler main body.

FIG. 9 shows a fourth embodiment of the present invention, wherein A is a perspective view of a metal core, B is a plan view, C is a width side view, and D is a longitudinal side view.

FIG. 10 is a track link used in the embodiment, wherein A is a front view and B is a bottom view.

FIG. 11 is a partial state diagram of a rubber track body with a track link attached thereto, and B is a plan view of an outer peripheral side.

FIG. 12 shows a conventional example.

FIG. 13 shows a conventional example.

FIG. 14 shows a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Core metal 1a Wing part 1b Central part 2 Crawler main body 2a Curved part 3 Reinforcement layer 4 Lug 5 Track link 6 Pin hole 7 Window 8 Lower frame 8a Upper surface 9a (of lower frame) 9 Link pin p Bolt hole of core metal h Step g Upper surface (of track link) f Lower surface (of track link) p 'Bolt hole l (Track link) l Pin hole spacing k Bolt k' Nut o Center line of link pin m Blade overhang, n Center overhang l ' Bolt hole spacing 43a Lug overhang

Claims (1)

(57) [Scope of request for utility model registration] 1. A rubber crawler wound around driving wheels, idler wheels and rolling wheels of an iron crawler device, wherein a metal core comprising flat left and right wing portions and a central portion is circumferentially mounted in a rubber crawler body. The lugs are buried at regular intervals, project lugs on the outer peripheral surface corresponding to the left and right wing parts, and a pair of track links are attached to both sides of the core metal center part on the inner peripheral surface side and each is adjacent in the circumferential direction. In a rubber track in which a track link is connected back and forth to form a track by a pair of continuous track links on both sides of a central portion on the inner peripheral surface side, a rubber crawler main body between adjacent core metals of an embedded core metal has an inner circumference. A link pin formed in a curved portion curved to be higher toward the side, and a position of a link pin for connecting adjacent track links is located within the curved curved portion of the rubber crawler body. Type rubber track.