JPH0717657Y2 - Connection link type rubber crawler - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a connection link type rubber crawler suitable for mounting on an iron crawler device such as a mobile construction machine.

(Prior Art) A mobile crawler is conventionally equipped with an iron crawler, and a rubber shoe is used for a part of the iron crawler, but a rubber crawler has recently been favorably used.

FIG. 12 is a sectional view of an example of a conventional iron crawler.
Is an outer brim wheel, 102 is an iron crawler shoe, 102a is a shoe plate, 102b is a shoe link, 102c is a link pin, 10
2d is a rug (made of iron). FIG. 13 is a sectional view of an example of a rubber shoe. 103 is a rubber shoe, 103a is a shoe plate, 103b 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 crawler, 104 is a rubber crawler, 104c is a lug, 105 is a core bar, 10
6 is a steel cord. In FIGS. 12 to 14, all the rolling wheels can be the same outer brim rolling wheels.

By the way, the iron crawler has a small vibration because the track link is connected to the inner circumference to form a continuous wheel raceway.
It has advantages such as less crawler disengagement because there is no stretching or phase shift in the circumferential direction and width direction, and excellent durability due to large mechanical coupling of each link, etc. Is large, the cushioning property is poor and the driver's fatigue is large, the road surface is damaged, and the like.

On the other hand, the rubber crawler has low noise,
It has advantages such as good cushioning, less fatigue to the driver, no damage to the road surface, relatively small weight, and relatively high traveling speed due to the characteristics of and. However, the disadvantages are that the core metal protrusion protruding on the inner peripheral surface is used as the rolling wheel raceway, so the vibration is slightly large, the steel cord is embedded in a slightly wavy shape, and both ends of the steel cord are Are only superposed with a thin rubber layer interposed, the crawler stretches during abnormal tension, there is lateral displacement between the cores when an external force is applied in the lateral width direction, and the above causes Crawler disengagement occurs, and the mechanical strength of the rubber crawler is based on the adhesive force between the rubber material and the core metal and steel cord, which is considerably inferior to the mechanical strength of the iron crawler. Even rubber crawler in terms of sex considerably less than the iron crawler, there are problems like.

On the other hand, a rubber shoe with a rubber lug on the ground side of the shoe plate of the iron crawler has the weakest adhesive force between the shoe plate and the rubber lug in the configuration of the iron crawler with excellent mechanical strength. Since the rubber lug is pressed between the rigid body (shoe plate) and the ground, and there is no escape, it is damaged quickly, and vulcanizing and adhering the rubber lug to each shoe plate will increase the cost considerably, etc. However, it cannot be superior to the rubber crawler after all.

(Problems to be Solved by the Invention) The present invention is to solve the above-mentioned drawbacks in a rubber crawler, and to solve the drawbacks of the rubber crawler by virtue of the advantages of the iron crawler by incorporating the structure of the iron crawler. It is a thing.

By the way, the rubber crawler devised in Japanese Utility Model Application No. 60-59128 (Japanese Utility Model Application No. 61-175091) is a core crawler which is embedded in the inner peripheral surface of a rubber crawler belt 16 formed in an endless belt shape with a certain gap. 17 On the upper side surface, the front and rear ends of the left and right side walls (track links) 19 and 19 'which are erected with a certain gap are provided on the other side walls 19-1 and 19'.
-1, in a state of overlapping with -1, is continuously connected in the shape of an endless chain that is bendable via insertion pins 22.

However, in this rubber crawler, as shown in FIG. 2 of the publication, since the insertion pin 22 is located at a high position on the inner peripheral surface of the rubber crawler 16 and the two are separated from each other, the rubber crawler becomes a sprocket. In the winding part, the insertion pin fits the sprocket and is wound closely,
The rubber crawler main body makes a large detour around the outside away from the insertion pin, so that excessive elongation strain occurs in the rubber crawler main body between the embedded cores, resulting in extremely low durability.

(Means for Solving the Problem) A feature of the present invention is that a cored bar composed of a flat-shaped left and right wing portion and a central portion is embedded in the rubber crawler body at regular intervals in the circumferential direction and the left and right wing portions are supported. Lugs are provided on the outer peripheral surface, and a pair of track links are attached to both sides of the central portion of the core on the inner peripheral surface side. In a rubber crawler in which a pair of continuous track links are formed on both sides of the central portion of the core claw, the core metal is formed in a concave shape in which the central portion is located one step lower than the left and right wing portions, and adjacent track link mutual The position of the link pin that connects the two is to be a low position that is approximately flush with the inner peripheral surface of the rubber crawler body.

At this time, the rubber crawler main body between the embedded cores can be formed into a curved portion that is curved so as to be higher toward the inner peripheral side.

The details of the present invention will be specifically described by the following examples.

(Embodiment) FIG. 1 shows a core metal 1 used in the first embodiment of the present invention, in which A is a perspective view, B is a side view, and C is a top view. 1a is a left and right wing portion, 1b is a concave 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 the wing portion 1a.
It is as a lower position.

FIG. 2 shows a rubber crawler main body 2 in which the core metal 1 is embedded at regular intervals. A is a plan view and B and C are drawings A.
2 is a sectional view taken along line X-X and Y-Y of FIG. 1, in which the left and right wing portions 1a, 1a are embedded in the rubber material of the crawler body 2, but the bolt holes p, p of the central portion 1b are formed. The surrounding area is not buried. Reference numeral 2a denotes a curved portion in which the crawler body between the blades 1a and 1a adjacent to each other in the circumferential direction of the cored bar embedded in the rubber crawler body is curved so as to become higher toward the inner circumferential side, and 3 is continuous in the circumferential direction. Reinforcing layer, which is the reinforcing layer 3 in this example as shown in the figure.
Since it is buried through the lower part of the blade portion 1a, it has a wavy shape, and 4 is a lug projecting on the outer peripheral surface corresponding to the blade portion 1a. 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 this embodiment, where A is a front view and B is a bottom view.
It is the same as the one used conventionally for some iron crawlers. In the figure, 6 is a pin hole, and the distance l between the left and right pin holes 6, 6 has the same size as the core metal interval, 7 is a window, 8 is a lower frame of the window 7, and p'is A bolt hole for attaching the track link to the central portion 1b of the core metal, and as shown in the figure, the bolt hole p'is the upper surface 8a of the lower frame 8.
The lower surface f of the track link is further penetrated. Further, the upper surface g of the track link is a flat surface to form a wheel raceway. The left and right pin holes 6 and 6 are formed in a thin portion (1/2 of the wall thickness t) in a mutually contradictory relationship at the left and right positions, so that the front and rear track pins are connected to each other with the same wall thickness. It is supposed to be done in the state.

For the connection, the bolt hole p'and the bolt hole p of the central portion 1a of the core metal are aligned with each other and bolted to connect the bolt holes p and p ', so that a pair of tracks are provided on both sides of the central portion 1a. The link is erected, the pin holes 6 of the front and rear track links are overlapped, and the link pin is rotatably inserted between the overlapped pin holes to be connected to form a continuous wheel raceway. Note that k is a bolt for attaching the track link and the core bar, and k'is a nut for the same.

FIG. 5 shows a track link 5 on the crawler body 2 of this embodiment.
FIG. 4 is a partial state view in which is attached, A is a front view, B is a sectional view, and 9 is a link pin in the drawing. As shown in the figure, according to the present invention, the link pin position for connection is at a low position where it is approximately flush with the inner peripheral surface of the rubber crawler body, and the lug height of the lugs 4, 4 and the rubber layer (blade) Part 1a
(Rubber thickness from the bottom surface of the to the ground surface) becomes relatively large,
Therefore, even if the lug 4 receives a large load and is compressed below the wing portion 1a (rigid body), since the lug 4 has a sufficient rubber thickness, the compression force is dispersed and the durability time is greatly extended. In this embodiment, the problem seen in the rubber shoe does not occur.

FIG. 6 illustrates a winding state of the connection link type rubber crawler of the present invention around a drive 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 extension rate increases as the distance from the outer peripheral side increases, while the crawler body does not extend in the cored bar embedded portion but the cored bar. However, if the extension ratio of this portion becomes large, fatigue due to repeated extension accumulates and the durability is impaired.In the present embodiment, however, in the present embodiment, the wing portion 1a and the central portion of the cored bar are formed.
Since the step h is provided between the track link 1b and the central portion 1b, the track link can be mounted at a relatively low position, and the curved portion 2a is provided between the core bars of the crawler body. Because of this, the height of this part increases toward the inner peripheral side and becomes almost the same as the height of the link pin.Therefore, the winding part hardly expands and the problem of fatigue accumulation does not occur. is there.

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

FIG. 7 shows a second embodiment of the present invention, where A is a plan view of the core bar 11 used in this embodiment, and B is a plan view of the outer peripheral side of the rubber crawler main body 21 of this embodiment. . As shown in FIG. A, the cored bar 11 has the left and right wing portions 11a, 11a in the shape of retreat wing with respect to the central portion 11b (retracting angle ∂), and the wing is embedded in the rubber crawler main body 21. Since the lug 41 is provided on the outer peripheral surface corresponding to the portion 11a, a part of the lug 41 is located on the extension of the center line o of the link pin 9 as shown in FIG. The vibration during driving is greatly improved, as there is almost no drop.

FIG. 8 shows a third embodiment of the present invention.
As shown in Fig. 7, the left and right wing portions 12a, 12a of the cored bar 12 are formed in a stepped shape, respectively, and are embedded in the rubber crawler main body 22 in the same manner as in the above embodiment to correspond to the wing portion 12a. Since the lug 42 is provided on the outer peripheral surface, a part of the lug 42 is located on the extension of the center line o of the link pin 9 as shown in FIG. B, and the same effect as the second embodiment is obtained. It will play.

FIG. 9 shows a core metal 13 used in the fourth embodiment of the present invention, A is a perspective view, B is a plan view, C is a width direction side view, and D is a longitudinal direction side view. In the figure, m and m are wing overhangs provided on the side surfaces of the left and right wings 13a and 13a near the center, and n and n are center overhangs provided on both sides of the center 13b. Bolt holes p are formed in each of the holes, and therefore, as shown in FIG.
bolt holes p, p on both sides of b through a space l '.
Will be installed side by side.

FIG. 10 shows one piece of the track link 51 used in this embodiment, where A is a front view and B is a bottom view.
As shown in the figure, bolt holes p'and p'are provided at two locations on the lower frame 8 and the distance l "is made equal to the bolt hole distance l'in the central portion 13b of the core metal.

FIG. 11 shows the rubber crawler of this embodiment.
FIG. 4 is a partial state view in which a track link 51 is attached to the crawler main body 23, and as shown in the figure, the track link 51 is bolted to the central portion 13b of the core metal at two positions. FIG. B is a plan view of the outer peripheral side of the crawler body 23. As shown in FIG.
A lug overhanging portion 43m is provided on the side surface of the lug 43 corresponding to the central overhanging portion m of 13, and the lug overhanging portion 43m is a track link.
It is assumed that it is located on the extension of the center line o of the link pin 9 of 51. Therefore, the rolling wheels do not fall at the position of the link pin, and vibration during running is improved.

In the above-mentioned connection link type rubber crawler of the present invention,
Since the link pin engages with the drive wheel to transmit the driving force, the central portion of the cored bar can have an arbitrary cross-sectional shape regardless of the root of the drive wheel. Is relatively cheap to produce. Also, the track link is
It is convenient because it can be used even if it is manufactured for a conventional iron crawler.

(Effect of the Invention) Since the rubber crawler of the present invention is connected to the inner peripheral side of the track link to form a continuous rolling track, the drawbacks of the conventional rubber crawler can be improved as follows. Driving vibration is small. Crawler disengagement hardly occurs because the circumferential extension and the lateral displacement do not occur. The mechanical coupling force of each link is large, so durability is improved.
The use of steel cords, which is essential for conventional rubber crawlers, can be omitted. Since the protrusion of the cored bar is not required, the cost can be reduced.

According to the present invention, a step is provided on the core metal between the wing portion and the central portion to lower the central portion, so that the track link can be mounted at a relatively low position, and the link pin The height position is almost the same as or slightly higher than that of the crawler body.Therefore, there is almost no extension strain even at the winding part around the drive wheel or idle wheel, and the problem of accumulated fatigue occurs. Will not occur. By curving the rubber crawler body between the buried cores so as to be higher inward, the height of the rubber crawler body is almost the same as the height of the link pin of the track link. The rubber crawler has substantially no extension even in the winding portion around the drive wheel and the idle wheel, and is a rubber crawler having further excellent durability.

In addition, the lug height and the rubber thickness under the wing portion of the core metal become large, so that the lug disperses the compression force due to a large load and extends the durability time greatly, and therefore the durability time of the rubber crawler is also greatly increased. It will be extended.

In addition, according to the present invention, since the central portion of the cored bar can have an arbitrary cross-sectional shape regardless of the roots of the drive wheels, the cored bar is relatively inexpensive to manufacture, and the track link has a conventional iron core. It is convenient because the one used for a part of the crawler can be used as it is, and as a result, the excellent rubber crawler as described above can be produced relatively simply and inexpensively as a whole.

[Brief description of drawings]

1 to 5 show a first embodiment of the present invention. FIG. 1 shows a cored bar used in this embodiment, where A is a perspective view, B is a side view, and C is an upper surface. FIG. 2 and FIG. 2 show a crawler body, A is a plan view, B and C are XX lines of FIG.
FIG. 3 is a perspective view of the rubber crawler body, and FIG. 4 is a track link used in the present embodiment.
Is a front view, B is a bottom view, FIG. 5 is a partial state view in which a track link is attached to a rubber crawler body, A is a front view, B is a sectional view, and FIG. 6 is a connection link type rubber crawler of the present invention. FIG. 7 shows a second embodiment of the present invention, in which the winding state of the drive wheel or the idle wheel is described.
Is a plan view of the core bar used in this embodiment, B is a plan view of the outer circumference of the rubber crawler body, FIG. 8 shows a third embodiment of the present invention, and A is used in this embodiment. Is a plan view of a core bar, B is a plan view of the outer periphery of the rubber crawler body, FIGS. 9 to 11 show a fourth embodiment of the present invention, and FIG. 9 is a core bar used in this embodiment. Where A is a perspective view, B is a plan view, C is a width direction side view, D is a longitudinal direction side view, FIG. 10 is a track link used in this embodiment, A is a front view, and B is a side view. The bottom view and Fig. 11 show the rubber crawler body
Is a partial state view with a track link attached, B is a plan view on the outer peripheral side, and FIGS. 12 to 14 are conventional examples. 1 ... Core bar, 1a ... Wing part, 1b ... Central part, 2 ... Crawler body,
2a ... curved part, 3 ... reinforcing layer, 4 ... lug, 5 ... track link, 6 ... pin hole, 7 ... window, 8 ... bottom frame, 8a ... (bottom frame) upper surface, 9 ... link pin, p ... ( Bolt hole of core bar, h ... step, g ... upper surface of track link, f ... lower surface of track link, p '... bolt hole of track link,
l ... pin hole spacing, k ... bolt, k '... nut, o ... link pin center line, m ... blade overhanging portion, n ... central overhanging portion,
l '... bolt hole spacing, 43a ... lug overhang,

Claims (2)

[Scope of utility model registration request] 1. A rubber crawler to be wound around a driving wheel, an idler wheel and a rolling wheel of an iron crawler device, wherein a cored bar consisting of flat left and right wings and a central part is circumferentially arranged in the rubber crawler body. The lugs are embedded at regular intervals, and lugs are provided on the outer peripheral surface corresponding to the left and right wings, and a pair of track links are attached to both sides of the central portion of the core on the inner peripheral surface side and are adjacent in the circumferential direction. In a rubber crawler in which track links are connected to the front and back to form a track formed by a pair of continuous track links on both sides of a central portion on the inner peripheral surface side, the center portion of the core bar is lower than the left and right wing portions by one step. The link crawler type rubber crawler is characterized in that it is formed in a concave shape and the position of the link pin for coupling the adjacent track links to each other is arranged at a lower position which is approximately flush with the inner peripheral surface side of the rubber crawler body. 2. A link crawler type rubber crawler according to claim 1, wherein the rubber crawler main body between the adjacent cores is formed into a curved portion which is curved so as to be raised toward the inner peripheral side.