JP4215460B2 - Crawler link - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a crawler belt link for connecting a crawler belt used in a work machine including a tracked traveling body.
[0002]
[Prior art]
Conventionally, a crawler track of a lower traveling body in a track-type work machine such as a power shovel or a bulldozer has a crawler plate attached to an endless link, and the crawler track is supported by a body frame. A lower rolling wheel that is wound around a driving wheel and an idler wheel arranged at a required interval, is driven by meshing the link with a sprocket of the driving wheel, and is disposed on the body frame between the driving wheel and the idler wheel. And is supported by the upper wheel so that it can run.
[0003]
As shown in FIGS. 7 (a) and 7 (b), the links in such a crawler belt are formed by linking the link pieces 51, 51 formed symmetrically in the width direction with a crawler belt bush 52 at a predetermined interval. The links are connected to form one link (link assembly 50), and the link assemblies 50 are sequentially connected by connecting pins 53 that are inserted into the crawler belt bushing 52. Further, the shoe plate 55 has a required dimension and is inserted into an end surface corresponding to the grounding side of each link assembly 50 at a middle position of the link piece 51 in a direction perpendicular to the axial direction of the connecting pin 53. The bolt 56 and the nut 57 are fastened and fixed.
[0004]
Since the crawler belt is configured as described above, the link assembly 50 to be used (hereinafter simply referred to as a link) does not cause any problem regardless of whether the number of links 50 to be generally connected is even or odd. Thus, a so-called offset link is used in which the link pieces 51 and 51 having a shape offset at the connecting portion are arranged symmetrically. Further, in order to fasten the crawler plate 55 and the link piece 51, two open holes 58 (nut loading openings) are provided between the connecting pin hole of the link piece 51 and the bush mounting hole, and the link piece. A nut holding seat is provided on the opposite surface of the formation portion of the watermark hole 58 in 51 with respect to the crawler plate mounting surface.
[0005]
The crawler track constructed in this manner functions to transmit power when traveling, and supports the entire work machine on the ground contact side, so that it needs to have a sturdy structure as a whole. Therefore, the crawler belt link 50 has a sturdy structure with a structurally thick wall unlike the link of a general power transmission chain.
[0006]
[Problems to be solved by the invention]
However, since the conventional crawler belt link is based on the premise that a failure is not caused by employing a strong and strong link, its weight is inevitably increased. In particular, the number of links constituting the crawler belt mounted on one work machine is at least more than 80, and the unit weight is very large as a total weight even if it is not excessive. Therefore, more power for the drive is consumed. Such a thing requires the promotion of energy saving as a part of recent environmental measures, and therefore, it is necessary to review the work machine equipped with this type of crawler track.
[0007]
From such a viewpoint, in the crawler belt composed of a crawler plate that connects a large number of links and attaches to them, it is investigated whether or not it is formed using excess material, and the necessary strength is secured. Therefore, an economic effect is demanded in that the weight can be reduced by reducing its own weight and the energy can be saved and the cost can be reduced by reducing excessive power consumption.
[0008]
The present invention has been made in view of such circumstances, and provides a crawler belt link that achieves weight saving as a whole without impairing the durability of the link, and can achieve energy saving and economic effects. It is for the purpose.
[0009]
[Means for solving the problems and actions / effects]
In order to achieve the above-mentioned object, the crawler belt link according to the present invention comprises:
A crawler belt link constituting a crawler belt in a tracked work machine,
It has an opening (15 ) for fixing the connecting pin (4) at a required interval and an opening (16) for fixing the crawler belt bush (5), and is attached to the footplate mounting portion (19) on the grounding side in the height direction. A plurality of bolt insertion holes (20) for coupling the link to the crawler plate are provided, and a nut loading opening (21) is formed at one end of the bolt insertion hole (20) , and the nut loading opening (21 wherein the the portion not in contact bolt insertion hole (20) in), the web portion opening direction of thickness is formed is engraved from both the inner and outer surfaces with a thin webbed-like in the width direction compared to the peripheral portion of its (23) Is provided .
[0010]
According to the present invention, the thickness in the opening direction of the portion that does not contact the bolt insertion hole in the opening portion for loading the nut and the link for connecting the shoe plate and the link is formed to be thinner than the other portions in the peripheral portion. Thus, the weight can be reduced without reducing the strength of the non-grounding side. As a result, the ability to reduce the unit weight of the link can significantly reduce the weight of the crawler track configured by connecting a number of links, greatly reducing power consumption during operation, saving energy and using it. There is an effect that the cost reduction accompanying the reduction of the material can be obtained together.
[0011]
In the invention, the web portion (23) is formed between the ground-side part and a non-grounded portion provided with the bolt insertion hole (20), wherein the middle portion in the width direction of the non-grounded portion It is preferably located . By doing so, it maintains the non-grounded portion of the link, even if the opening adjacent portion facing the bolt hole in nut loading opening is formed in the thin, cross-sectional strength against a load applied to the non-grounded portion And can exert the effect of weight reduction.
[0012]
In the present invention, a plurality of the nut loading openings (21) are provided , and a non-grounding side plane forming portion (18) and a grounding side crawler plate mounting portion (between the plurality of nut loading openings (21). An intermediate support part (22) connecting 19) may be provided . By providing a plurality of loading openings as described above , the fastening and fixing ability between the link and the crawler plate can be enhanced. In addition, by forming the intermediate support portion (22) in the middle position, it is easy to punch out the opening for loading the nut by die forging, and the creation of the thin-walled portion can be easily and easily performed. There is an effect that the sex can be enhanced.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Next, specific embodiments of the crawler belt link according to the present invention will be described with reference to the drawings.
[0014]
FIG. 1 is a partially exploded perspective view of a crawler belt according to an embodiment of the present invention. FIG. 2 is a perspective view showing a crawler belt subassembly in which a crawler plate and a link are combined, FIG. 3 is a front view of the link, and FIG. 4 is an external perspective view (a) as seen from diagonally below the link. FIG. 5 shows an inner side perspective view (b) of the link as viewed obliquely from above, and FIG. 5 shows a cross-sectional view taken along line AA of FIG.
[0015]
A crawler belt link 10 (hereinafter simply referred to as a link 10) according to the present embodiment is one of the crawler belts 1 incorporated in a lower traveling body (not shown) in a track-type construction machine (work machine) such as a hydraulic excavator or a bulldozer. As shown in part of FIG. 1, the pair of left and right links 10 and 10 are bolted to the crawler plate 3 arranged on the grounding surface side to fasten the crawler plate 3 and the link 10. This is an offset type link that is used to construct a crawler belt 1 by connecting a number of assembled ones with connecting pins 4 and bushes 5 at the link portion.
[0016]
The links 10 are symmetrically arranged with respect to the connecting direction axis and are assembled by connecting pins 4 and bushes 5 at predetermined intervals, and are sequentially connected. Is bolted (described later). Since the link 10 is symmetrical, only one side will be described below.
[0017]
The link 10 is offset in the width direction with a dimension that overlaps the other end portion 13 with respect to the one end portion 12 from the intermediate position so that the main body portions 11 are aligned in a row in a connected state. The offset other end 13 is provided with a counter boss 14 on the outside, and a connecting pin hole 15 (corresponding to an opening for fixing the connecting pin of the present invention) is orthogonal to the main body 11 in the counter boss 14. A crawler belt bushing mounting hole 16 (corresponding to an opening for fixing the crawler belt bush of the present invention) is provided in one end portion 12 in parallel with the connecting pin hole 15. The distance between the shaft centers of the connecting pin hole 15 and the crawler belt bush mounting hole 16 is the connecting pitch of the link 10. A seal hole 17 in which a seal ring is mounted is formed coaxially with the connecting pin hole 15 on the inner surface of the other end 13 opposite to the counter boss 14.
[0018]
In the intermediate portion of the main body 11 of the link 10 thus configured, a flat surface forming portion 18 having a required wall thickness is provided on the non-grounding side so as to cover the offset portion, and is opposite to the flat surface forming portion 18 in parallel. On the grounding side, a footwear mounting portion 19 is formed with a thickness of a required dimension. Note that the non-ground side plane forming portion 18 has an outer end at the one end portion 12 and an other end portion so as not to interfere within a range in which the link 10 is rotated with respect to the connecting pin 4 when used. In FIG. 13, the inner side is notched.
[0019]
Bolt insertion holes 20 are drilled in the crawler plate mounting portion 19 at two required intervals so as to be orthogonal to the mounting surface of the mounting portion 19. Nut loading openings 21, 21 are provided corresponding to the bolt insertion holes 20 between the crotch plate mounting portion 19 in which the bolt insertion holes 20 are provided and the non-grounded plane forming portion 18. .
[0020]
As shown in FIGS. 3 to 5, an intermediate support portion 22 is provided between the nut loading openings 21, 21 so as to connect the non-grounded plane forming portion 18 and the footwear mounting portion 19. In a state where thin webbed web portions 23 and 23 are engraved from both the inner and outer sides between the intermediate support portion 22 and the flat surface forming portion 18 so as to be connected to the nut loading openings 21 and 21. Is formed. Also, the intermediate supporting portion 22, as shown in FIG. 5, the flat cross section is formed in the shape shape close to a rhombus.
[0021]
Further, at both end portions 12 and 13 of the main body portion 11, the surplus portion (strength of strength) in the upper portion 13 a and the lower portion 13 b of the counter boss 14 corresponding to the non-grounding side and the formation portion upper portion 12 a of the crawler belt bush mounting hole 16. The parts that are not affected by this are engraved to reduce weight.
[0022]
The link 10 of the present embodiment configured as described above has an outer shape formed by die forging in manufacturing. Therefore, at the time of the forging process, punching of the nut loading openings 21, 21 provided across the intermediate support portion 22 in the intermediate portion of the main body 11 and the intermediate support portion 22 connected to the nut loading opening 21 are performed. And a thin webbed web portion 23 formed between the flat surface forming portion 18 and the flat surface forming portion 18 are integrally formed. The connecting pin hole 15 and the seal hole 17 and the crawler belt bush mounting hole 16 are machined and finished according to a predetermined connecting pitch. Further, the bolt insertion holes 20 and 20 provided in the crawler plate mounting portion 19 are also drilled so that the crawler plate is fastened with bolts.
[0023]
The link 10 of the present embodiment has a section coefficient that can sufficiently withstand the load acting on the cross-sectional shape of the important point during driving as shown in FIG. It is formed so that the cross-section becomes small at a small portion of.
[0024]
That is, the upper section 1-1 in FIG. 6 is formed with a normal thickness required to attach the crawler belt bush to the link one end portion 12. Cross-section 2-2 passes through the axis of the bolt insertion hole 20 that fastens the shoe plate, cuts through the nut loading opening 21, and the portion in contact with the nut loading opening 21 is a thin web portion 23. As can be seen, the web portion 23 is positioned approximately in the middle of the thickness direction (width direction) of the plane forming portion 18 at the offset link intermediate portion. Further, the cross section 3-3 shows a cross sectional shape at a position where the intermediate support portion 22 is disengaged, and the cross section 4-4 is a cross sectional shape in which the position of the intermediate support portion 22 is cut vertically, and the front side is held slightly inward at this portion. In this way, the flat surface forming portion and the crawler plate attaching portion are integrated. Each of the cross section 5-5 and the cross section 6-6 is substantially symmetrical with the cross section 3-3 and the cross section 2-2. Further, the cross section 7-7 is almost the same as the conventional one when the center of the connecting pin hole is cut vertically.
[0025]
As described above, the link 10 of the present embodiment has a cross-sectional shape substantially the same as that of the conventional one at the one end portion 12 and the other end portion 13 where the traction force acts directly so that durability can be maintained. And in the intermediate part, the intermediate support part 22 with respect to the load of the up-down direction which acts via the track board 3 (refer FIG. 1) is the circumference of the connection pin hole 15 of both ends 12 and 13, and the crawler belt bush mounting hole 16 circumference. In particular, the intermediate support portion 22 serves as a support column around the nut loading openings 21 and 21, and the web portions 23 and 23 in contact with the openings support the intermediate support portion 22 and both ends 12, By adopting a structure that acts as a rib connecting between the two, the reduction in cross-sectional strength can be prevented even though the portion is formed thin.
[0026]
In addition, the cross section of the intermediate support portion 22 is formed in a substantially rhombus shape, and the web portions 23 and 23 are formed so as to be located in the middle in the width direction. It is possible to facilitate die forging by offsetting the end portion 13, and it is possible to reliably drop and mold the nut loading opening 21.
[0027]
The link 10 of this embodiment formed in this way can reduce the weight with almost no reduction in strength compared to the conventional product. By the way, the weight difference between the conventional product and that of the present embodiment is 9.25 kg for the conventional product, while that of this embodiment is 8.30 kg, and the difference is -0.95 kg. . Here, a weight difference of −0.95 Kg means that there are two links per link assembly even if there is no difference between the bush and the connecting pin in one link assembly, so the weight loss per link assembly is − 1.9 kg. Therefore, if the number of links in one track of the tracked vehicle is 40, -1.9 × 40 = 76 Kg, and since the lower traveling body requires two tracks, 76 × 2 = 152 Kg Become.
[0028]
In this way, even if the weight reduction per link is small, if it is considered as a crawler track configured by connecting a large number of links, the greater the number of links, the greater the change in the conditions of the crawler track itself. It is possible to achieve a significant weight reduction. As a result, the power consumption during driving can be greatly reduced, and the economic effect due to the reduction in operating cost and the reduction in product materials can be remarkably enhanced.
[0029]
Furthermore, according to the present invention, in the case of a vehicle having the same performance by reducing the power consumption, it is possible to reduce the weight by replacing the drive with a drive corresponding to the performance corresponding to the power up or the power consumption. In addition, energy saving by reducing power consumption will contribute significantly to environmental improvement.
[Brief description of the drawings]
FIG. 1 is a partially exploded perspective view of a crawler belt according to an embodiment of the present invention.
FIG. 2 is a perspective view showing a crawler belt subassembly with a crawler plate and a link joined together.
FIG. 3 is a front view of the link of the present embodiment.
FIG. 4 is an external perspective view (a) from the diagonally lower side of the link and an inner side perspective view (b) of the link from the diagonally upper side.
FIG. 5 is a cross-sectional view taken along line AA in FIG. 3;
FIG. 6 is a cross-sectional view of the main part of the link of the present embodiment.
FIG. 7 is a perspective view (a) and a front view (b) of a conventional link subassembly.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Crawler belt 3 Crawler board 4 Connecting pin 5 Bush 10 Link 11 Link main-body part 12 Link one end part 13 Link other end part 14 Counter boss 15 Connecting pin hole 16 Crawler belt bush attachment hole 18 Planar formation part 19 Crawler board attaching part 20 bolt insertion holes 21 nuts loading opening 22 middle support part 23 web portion

Claims (3)

A crawler belt link constituting a crawler track in a tracked work machine,
It has an opening (15 ) for fixing the connecting pin (4) at a required interval and an opening (16) for fixing the crawler belt bush (5), and is attached to the footplate mounting portion (19) on the grounding side in the height direction. A plurality of bolt insertion holes (20) for coupling the link to the crawler plate are provided, and a nut loading opening (21) is formed at one end of the bolt insertion hole (20) , and the nut loading opening (21 wherein the the portion not in contact bolt insertion hole (20) in), the web portion opening direction of thickness is formed is engraved from both the inner and outer surfaces with a thin webbed-like in the width direction compared to the peripheral portion of its (23) A crawler belt link characterized by being provided . Said web portion (23), the bolt insertion hole is formed between the ground-side part and a non-grounded portion provided with (20), that is located in the middle portion in the width direction of the non-grounded side portion The crawler belt link according to claim 1. A plurality of nut loading openings (21) are provided , and a non-ground side flat surface forming portion (18) and a ground side crawler plate mounting portion (19) are connected between the plurality of nut loading openings (21). The crawler belt link according to claim 1 or 2, wherein an intermediate support portion (22) is provided .

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