JP2006321293A - Elastic crawler - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize the traveling property with a favorable balance by improving the soil discharging property, reducing the clogging of mud on the central section and the side sections, and enabling the propelling force to be effectively ensured regarding an elastic crawler which is used in wet paddy fields or semi-wet paddy fields. <P>SOLUTION: This elastic crawler has a crawler main body 2 which is formed into an endless belt shape of an elastic material, and lugs 4 and 5 which are protrusion-molded on the ground touching surface side of the crawler main body 2. The elastic crawler is constituted of the longer lug 4 which is formed over approximately the total width of the crawler main body 2, and the shorter lug 5 which is shorter than the longer lug 4. Also, the longer lug 4 and the shorter lug 5 are arranged in parallel in the belt length direction of the crawler main body 2, and at the same time, a plurality (e.g., two piece) of the shorter lugs 5 are arranged in such a manner that the shorter lugs 5 may form a zig-zag shape between a pair of adjacent longer lugs 4. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an agricultural elastic crawler, and more particularly to an elastic crawler used in wet fields, semi-humid fields, and the like.

  For example, an agricultural elastic crawler used in wet fields and semi-humid fields has a crawler body formed of an elastic material in an endless belt shape, and left and right wings, and is parallel to the crawler body at regular intervals in the longitudinal direction. A cored cord, a steel cord embedded in the crawler body so as to enclose the cored bar from the outer peripheral side, a lug or the like that protrudes from the grounding surface side of the crawler body corresponding to the position where the cored bar is embedded It is set as having. This lug includes a long lug formed over substantially the entire width of the crawler main body, and a short lug shorter than the long lug and formed in a substantially central portion of the crawler main body. Examples of the arrangement structure of each lug include those disclosed in Patent Documents 1 and 2, for example.

  FIG. 9 is a plan view of the ground contact surface of the elastic crawler 30 disclosed in Patent Document 1. FIG. The elastic crawler 30 is formed on a projection surface of a long lug 32 formed to extend linearly over the entire width of the crawler main body 31 and a cored bar 34 in the center on the ground contact surface of the crawler main body 31. The lugs 33 are alternately formed. Further, the short lug 33 is formed at a central position with respect to the entire width direction of the crawler main body 31 (left and right direction in the figure).

On the other hand, FIG. 10 is a plan view of the ground contact surface of the elastic crawler 40 disclosed in Patent Document 2. FIG. The elastic crawler 40 has a plurality of lugs 42L and 42R shorter than the width of the crawler body 41. The plurality of lugs 42L and 42R are formed on the ground contact surface of the crawler main body 41 so as to overlap with the projection surface of the cored bar 44, and are formed so as to be arranged in a staggered manner in the longitudinal direction of the crawler main body 41. Yes.
JP 59-118580 A JP 58-071276

According to the above configuration, in the elastic crawler 30 shown in FIG. 9, between the long lugs 32, an interval of 2 pitches (a portion indicated by an arrow A in the drawing) and a 1 pitch interval portion (shown by an arrow B in the drawing) Part) is formed, and the mud drop is good because the two pitch interval part A on the side of the crawler has a width. However, since the gap between the lugs 32 and 33 is narrow at the one pitch interval portion B in the center, the mud adhering between them is difficult to fall naturally, and there is a problem that sufficient traction force cannot be obtained. In addition, since the long and short lugs 32 and 33 are alternately arranged, there is a problem that the balance is poor and uneven wear occurs and durability is lowered.

  In order to solve this problem, it is conceivable to widen the one pitch interval portion B. However, with this configuration, there arises a problem that the rolling wheels between the lugs increase when the vehicle is running, and the vehicle vibration increases. Furthermore, a configuration is also possible in which two short lugs 33 are arranged so that the interval between the long lugs 32 is wide. With this configuration, although the mud is effectively removed, a sufficient propulsive force is obtained at the interval portion A. The problem that it is not possible arises.

  Also, in the elastic crawler 40 shown in FIG. 10, since the plurality of lugs 42L and 42R are arranged in a staggered manner, an interval of two pitches (indicated by an arrow A in the figure) is provided between the lugs 42L and 42R. Part shown) and one pitch interval part (part shown by arrow B in the figure). That is, by arranging the lugs 42L and 42R slightly shorter than the width on the grounding side of the crawler body alternately in a staggered manner for each pitch, the frictional force acting on the lugs 42L and 42R becomes equal, and the road surface is relatively hard. The problem of vibration does not occur especially when driving on the road. However, when traveling in soft wetlands, wet fields, etc., there is a space in the left and right positions (portion indicated by arrow A in the figure), so mud drop is good, but the central area (indicated by arrow B in the figure) In (part), there is a problem that the space is narrow and the mud stuck and stuck between the lugs 42L and 42R is difficult to fall, and sufficient traction force cannot be obtained.

The present invention has been made in view of the above points, and reduces mud clogging in the central part and the side part to improve soil removal performance, and can effectively ensure propulsion, and well-balanced traveling performance. It aims at providing the elastic crawler which can exhibit.

  In order to solve the above-described problems, the present invention is characterized by the following measures.

The invention according to claim 1
A crawler body formed of an elastic material in an endless belt shape,
A metal core having left and right wings and arranged in the crawler body at a predetermined interval in the longitudinal direction;
In the crawler body, a steel cord embedded so as to surround the cored bar from the outer peripheral side,
In the elastic crawler provided with a lug formed to protrude corresponding to the position where the core metal is buried on the grounding surface side of the crawler body,
The lug includes a first lug formed over substantially the entire width of the crawler main body, and a second lug having a length shorter than the first lug,
The first and second lugs are arranged side by side in the longitudinal direction of the crawler body, and a plurality of the second lugs are arranged so as to form a stagger between the first lugs. It is.

The invention according to claim 2
A crawler body formed of an elastic material in an endless belt shape,
A metal core having left and right wings and arranged in the crawler body at a predetermined interval in the longitudinal direction;
In the crawler body, a steel cord embedded so as to surround the cored bar from the outer peripheral side,
In the elastic crawler provided with a lug formed to protrude corresponding to the position where the core metal is buried on the grounding surface side of the crawler body,
The lug includes a first lug formed over substantially the entire width of the crawler main body, and a second lug having a length shorter than the first lug,
The first and second lugs are arranged side by side in the longitudinal direction of the crawler body, and the two second lugs are arranged so as to form a stagger between the first lugs. Is.

According to the first and second aspects of the present invention, the second and third soil discharge portions are formed at the left and right side portions between the first lugs, and the detachment of the mud stuck and retained between the lugs is facilitated. As a result , slippage in the wetland does not occur, and reliable running can be performed by demonstrating wetland performance.

The invention according to claim 3
The elastic crawler according to claim 1 or 2,
A concave groove is formed at a substantially central position with respect to the width direction of the first lug.

According to the said invention, by forming the ditch | groove in the substantially center position with respect to the width direction of the 1st lug, the fall of the mud adhering to the said center position is promoted, and a higher thrust can be obtained.

The invention according to claim 4
The elastic crawler according to any one of claims 1 to 3,
The second lugs adjacent to each other in the longitudinal direction with respect to the first lug are arranged so as to be shifted from each other in the width direction.

According to the above invention, the ground contact length of the two second lugs adjacent to each other with the first lug shifted in the longitudinal direction is close to that of the first lug, and the frictional force is exerted on the lug. , Average wear can be reduced, the durability of the elastic crawler can be improved, and vibrations of the aircraft can be prevented, so that the ride feeling can be improved and the feeling of driving fatigue can be reduced.

  According to the present invention, the following various effects can be realized.

According to the first and second aspects of the present invention, the mud stuck to and staying between the lugs can be smoothly separated to prevent slippage in the wet field, and reliable traveling can be performed by exhibiting wet field performance.

  Moreover, according to the invention of Claim 3, the fall of the mud adhering to the center position of the 1st lug is promoted, and a higher driving force can be obtained.

According to the invention described in claim 4 , the frictional force is averaged against the lug , the one-side wear is reduced, the durability of the elastic crawler is improved and the body vibration is prevented, and the ride feeling is improved and the driving is improved. Can reduce fatigue.

  Next, the best mode for carrying out the present invention will be described with reference to the drawings.

  1 to 6 show a basic configuration of an elastic crawler 1 according to an embodiment of the present invention. The elastic crawler 1 is configured such that a core metal 3 having left and right wing portions 3L and 3R is arranged in parallel at a constant interval in a longitudinal direction in a crawler main body 2 formed in an endless belt shape with an elastic material. Further, on the ground contact surface side of the crawler body 2, a first lug 4 (hereinafter referred to as a long lug) and a second lug 5 (hereinafter referred to as long lugs) corresponding to the embedded positions of the left and right wing portions 3 </ b> L and 3 </ b> R in the cored bar 3. A short lug).

  The cored bar 3 is desirably made of a metal casting or forging (press), but can also be made of an elastic material such as a resin composite material (elastomer). Further, the cored bar 3 is formed with a pair of protrusions 6L and 6R for preventing the wheel from coming off on the inner peripheral surface side at the left and right of the central portion in the band width direction.

  The base portions of the left and right protrusions 6L and 6R are connected to each other, and constitute an engaging portion 3A for a wheel or a sprocket. Here, at the center of the crawler body 2 in the band width direction, an engagement hole 7 for engaging and disengaging the driving wheel pawl is formed at a certain interval in the band longitudinal direction. 3 A of connecting parts are comprised (refer FIG. 2).

Left Right projections 6L, the inner peripheral surface of the crawler body 2 at each outer part of the 6R, as shown in Figure 3, strip-like guide surface (running rollers of the vehicle side is in contact) 8L, constitutes a 8R . In the crawler body 2 on the ground contact surface side of the left and right wing portions 3L and 3R of the cored bar 3, tensile bodies 9L and 9R represented by steel cords and the like are distributed and embedded to the left and right. Is preventing the growth of.

  As shown in FIG. 1, the crawler main body 2 is formed with a long lug 4 formed on the core metal 3 over substantially the entire width in the band width direction, and a short lug 5 shorter than the long lug 4. The short lug 5 is formed so as to overlap the projection surface of the cored bar 3 at the center of the crawler body 2.

Further, either one of the left and right sides of the short lug 5 is configured to have an extending portion 5 </ b> S that extends in the band width direction (left and right direction in the drawing) from the projection surface of the cored bar 3. A plurality of short lags 5 (two in FIG. 1) are arranged in parallel in the longitudinal direction of the crawler body 2, and are arranged in a staggered manner between the pair of long lags 4.

The single long lug 4 and the two short lugs 5 arranged in a zigzag form as one set, and a plurality of the sets are arranged in parallel in the longitudinal direction of the crawler body 2. Further, the short lugs 5 arranged with the long lugs 4 interposed therebetween are also shifted to the left and right.

  As a result, the two short lugs 5 between the adjacent long lugs 4 are configured such that the central portion (portion indicated by arrow Y2 in the figure) overlaps with the band longitudinal direction of the crawler body 2. Therefore, in this part, the pitch of each lug 4 and 5 becomes an interval for 1 pitch.

  The extending portion 5S is formed so as to extend in the band width direction from the central portion. At this time, the extending portions 5S formed in the plurality of rows of short lugs 5 are formed to alternately extend in the left-right direction, whereby the short lugs 5 are arranged in a staggered manner as described above. Become.

  Furthermore, the extending portion 5S formed in each short lug 5 is not formed up to the end edge of the crawler body 2, and has been extended slightly inside the end edge. For this reason, space 10A, 10B is formed in the right and left of each short lug 5. FIG.

  The space 10 </ b> A is a space portion formed between the end portion of the extending portion 5 </ b> S and the end edge of the crawler main body 2. The space 10 </ b> B is a space formed between the end of the short lug 5 opposite to the side where the extending portion 5 </ b> S is formed and the edge of the crawler body 2. Therefore, the length of the space 10A with respect to the band width direction of the crawler body 2 is shorter than the length of the space 10B with respect to the band width direction.

Thus, by forming the spaces 10A and 10B at the left and right end portions of the short lug 5, the space 10A having a short length in the band width direction and the space 10B having a long length in the band width direction are alternately arranged. It becomes the structure arrange | positioned in a zigzag form. Thus, a soil discharge passage in the edge direction of the crawler body 2 can be effectively ensured. Therefore, even when the mud adheres to the outer peripheral surface of the crawler body 2, the mud is efficiently separated, so that the elastic crawler 1 The soil removal performance can be made extremely excellent even when the vehicle is moving forward or backward.

In the present embodiment, the long lug 4 is divided into the left and right wing parts 4L and 4R by forming a concave groove 4C in the center part. By adopting this configuration, a sufficient space can be secured even in the central area of the crawler main body 2 , the soil removal performance in the central area of the crawler main body 2 is improved, and higher propulsive force is obtained in wet fields and soft ground. Obtainable.

  In addition, as shown in FIG. 1, the contact length of the long lug 4 is L2, and the two short lugs 5 formed in a staggered manner in the band width direction between the long lugs 4 adjacent to the center are overlapped. When the length is Y2 and the ground contact length of the extending portion 5S of the short lug 5 is Y3, the overall ground contact length (Y2 + Y3 + Y3) of the pair of short lugs 5 adjacent to the front and rear is in the width direction of the long lug 4. The frictional force acting on the long lug 4 and the short lug 5 is averaged to be close to the length L1 to improve the balance, and the occurrence of single wear can be suppressed.

  Further, the both wing portions of the crawler body 2 are formed with thin portions by gradually reducing the thickness in the outer region of the wheel passing surfaces 8L and 8R as they go outward. The wing portions 4L of the long lugs 4 are formed in the thin portions. , 4R and the extending portion 5S of the short lug 5 are provided. For this reason, the height of the wings 4L, 4R of the long lug 4 and the height of the extending portions 5S of the two short lugs 5 formed in a state shifted in the band width direction between the adjacent long lugs 4 are as follows. This has the advantage that the running performance can be increased. Furthermore, by adopting the configuration as described above, the traction force can be increased regardless of whether the elastic crawler 1 is moving forward or backward.

  7 and 8 show another embodiment of the present invention, and show the arrangement relationship between the cored bar 3, the long and short lugs 4, 5, and the recessed groove 4C. In the embodiment shown in FIG. 7, the long lugs 4 and the three short lugs 5 are taken as a set, and the three short lugs 5 are arranged in a staggered manner between the long lugs 4.

  In the embodiment shown in FIG. 8, the long lugs 4 and the three short lugs 5 are made into one set, and the three short lugs 5 are arranged in a staggered manner between the long lugs 4. The groove 4C is eliminated, and the effect can be exhibited when traveling on a flat hard road surface such as a concrete road surface.

In the above embodiment, the following design changes are possible.
(1) The left and right protrusions 6L and 6R for preventing wheel removal are rubber protrusions.
(2) The crawler drive type shall be drum drive.
(3) Use cable cords (elastomers made of polyethylene or the like) for the tensile bodies 9L and 9R.

FIG. 1 is a plan view showing a grounding surface of a crawler body showing the basic configuration of the present invention. FIG. 2 is a plan view showing the anti-grounding surface of the crawler body showing the basic configuration of the present invention. FIG. 3 is a cross-sectional view taken along the line AA of FIG. 4 is a cross-sectional view taken along line BB in FIG. 5 is a cross-sectional view taken along the line CC of FIG. FIG. 6 is a side sectional view in which a part of the crawler main body showing the basic configuration of the present invention is broken. FIG. 7 is a plan view showing another embodiment of the present invention. FIG. 8 is a plan view showing another embodiment of the present invention. It is a top view which shows the crawler main body which is a conventional example. It is a top view which shows the crawler main body which is a conventional example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Elastic crawler 2 Crawler main body 3 Core metal 4 Long lug 4L, 4R Wing | blade part 4C Concave groove 5R Short lug 7 Engagement hole

Claims (4)

A crawler body formed of an elastic material in an endless belt shape,
A metal core having left and right wings and arranged in the crawler body at a predetermined interval in the longitudinal direction;
In the crawler body, a steel cord embedded so as to surround the cored bar from the outer peripheral side,
In the elastic crawler provided with a lug formed to protrude corresponding to the position where the core metal is buried on the grounding surface side of the crawler body,
The lug includes a first lug formed over substantially the entire width of the crawler main body, and a second lug having a length shorter than the first lug,
The first and second lugs are arranged side by side in the longitudinal direction of the crawler body, and a plurality of the second lugs are arranged so as to form a stagger between the first lugs. Crawler. A crawler body formed of an elastic material in an endless belt shape,
A metal core having left and right wings and arranged in the crawler body at a predetermined interval in the longitudinal direction;
In the crawler body, a steel cord embedded so as to surround the cored bar from the outer peripheral side,
In the elastic crawler provided with a lug formed to protrude corresponding to the position where the core metal is buried on the grounding surface side of the crawler body,
The lug includes a first lug formed over substantially the entire width of the crawler main body, and a second lug having a length shorter than the first lug,
The first and second lugs are arranged side by side in the longitudinal direction of the crawler body, and the two second lugs are arranged so as to form a stagger between the first lugs. Elastic crawler. The elastic crawler according to claim 1 or 2,
An elastic crawler, wherein a concave groove is formed at a substantially central position with respect to the width direction of the first lug. The elastic crawler according to any one of claims 1 to 3,
An elastic crawler, wherein the second lugs adjacent to each other in the longitudinal direction with respect to the first lug are arranged so as to be shifted from each other in the width direction.

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