JPH11157472A - Elastic pad for metallic crawler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a metallic crawler elastic pad that is so designed as to make the breakage of a bolt obviable by preventing any looseness in traveling from occurring, in a device firmly attached with this elastic pad to a track shoe. SOLUTION: A part midway in the cross direction of a core material 5 is slightly bent in advance, whereby a clearance 13 is made so as to be produced in space between the round of a bolt connecting part 7 and a track shoe 2. When any connection with the track shoe 2 is carried out in this bolt connecting part 7, a small curve is produced in this core material 5, therefore since a hook part 6 is energized in the extraction direction by this curving action, such a fear of causing any looseness in an engaging part between this hook part 6 and the track shoe 2, is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an elastic pad for a metal crawler.

[0002]

2. Description of the Related Art Among crawler vehicles used for various works such as agriculture, civil engineering and construction, those equipped with a metal crawler include a metal crawler which travels on a pavement road or the like. It is preferable and required to attach an elastic pad made of rubber or the like to the shoe-making board.

[0003] This kind of elastic pad has a pad body formed of an elastic material such as rubber, and a metal core or the like provided on the back surface of the pad body or on the inside near the back surface. In the following, a direction parallel to the crawler width direction will be described as a width direction for the elastic pads (pad body and core material). Then, as a structure for mounting the elastic pad to the crawler crawler, a hook is provided at one end in the width direction of the core material, and in a state where this hook is engaged with one end of the crawler, There is one in which a core material is connected to a footwear plate by a lock pin that penetrates the other end portion in the thickness direction (Japanese Patent Laid-Open No. 8-58647).
Reference).

In the connection structure using the lock pin described in the above-mentioned publication, it is possible to quickly mount the lock pin, but it is rather troublesome to remove the lock pin when exchanging the elastic pad. In many cases, it can be costly to break,
A connection structure using bolts is applied.

[0005]

The hook portion of the core material is provided integrally by bending the core material itself into a U shape or the like, or by welding another member bent into an L shape to the core material. However, the bending interval in the hook portion was formed to be slightly larger than the thickness of the crawler crawler plate.
This makes it easy to engage and disengage with the footboard,
This is a measure for absorbing variations (errors) in the formed dimensions of the hook portion and the footwear plate.

However, even when the hook portion is engaged with the footwear plate, the core material has a slight clearance in the direction of coming and going with respect to the footwear plate. Note that this clearance is not eliminated even if the other end of the core material is connected to the crawler plate with a lock pin, a bolt, or the like. For this reason, when running vibration is applied to the elastic pad, rattling is likely to occur due to the clearance between the hook portion and the footwear plate, and noise and vibration are generated due to the rattling. In addition, it causes early wear of the hook part, loosening of the lock pin or bolt, wear, etc.,
In severe cases, the lock pins or bolts may be broken.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an elastic pad can be firmly attached to a footwear board to prevent rattling during running and to prevent various disadvantages associated therewith. It is an object of the present invention to provide a metal crawler elastic pad which can be prevented.

[0008]

According to the present invention, the following technical measures have been taken in order to achieve the above object. That is, the elastic pad according to the present invention includes a pad body made of an elastic material and a core material provided on the back side of the pad body, and a metal crawler is formed at one end in the width direction of the core material. A hook portion that can be engaged with the plate is provided, and a bolt connection portion to the footwear plate is provided at the other end portion,
The core material, when the hook portion is engaged with one end portion in the width direction of the crawler plate so as to overlap the crawler plate, the bolt connection portion is connected to the crawler plate around the bolt connection portion and between the facing surfaces of the crawler plate. It is configured such that a gap that can be eliminated by connection can be generated.

That is, in the core material, the hook portion is engaged with the footwear plate, and the bolt connection portion (when a nut member is provided integrally with the core material and the bolt is screwed from the footwear side,
In some cases, bolts are fixed to the core material and nuts are screwed into the shoe from the side of the shoe). The gap is that the core material and the crawler are trying to overlap exactly,
The core material itself gradually becomes smaller while inducing warpage, and is eventually eliminated.

[0010] Therefore, the warp generated in the core material at this time strongly urges the hook portion of the core material in a direction of pulling out the hook portion from the crawler plate (radially outward with respect to the circumferential direction of the crawler). Therefore, even if a clearance is generated between the engagement between the hook portion and the shoe plate, and even when running vibration is applied to this portion, there is no room for the rattle between the hook portion and the shoe plate within the clearance.

The gap between the periphery of the bolt connecting portion of the core material and the facing surface of the shoe plate may be formed by providing a bent portion protruding toward the shoe plate at a middle portion in the width direction of the core material. The structure can be formed by providing a protrusion toward the crawler plate in the middle of the material in the width direction.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a state in which a first embodiment of an elastic pad 1 according to the present invention is mounted on each outer surface 2a of a large number of metal footwear plates 2 constituting a metal crawler. The elastic pad 1 has a pad body 4 and a core member 5 provided on the back surface of the pad body 4. The pad body 4 is formed of an elastic material such as rubber or urethane. The core member 5 is formed of a metal material such as iron (an integrated product that is drawn, cast, forged, or the like, or a welded assembly of a plurality of members). These are integrated with each other by baking, insert, bonding or the like.

In this elastic pad 1, a hook portion 6 is provided at one end in the width direction of the core member 5 so as to be engageable with one end of the crawler plate 2. Is provided with a bolt connection portion 7. In the first embodiment, the hooks 6 are provided by forming the core 5 from a drawn iron plate and bending one end of the core 5 into a U-shape. In the hook portion 6, the inner turn-back interval is slightly larger than the thickness of the footwear plate 2, and when the hook portion 6 is engaged with the footwear plate 2, a slight clearance is generated between the two. It is.

Further, the bolt connecting portion 7 is provided with a bolt through hole 8 formed in the core member 5, and a nut member is formed so as to match the bolt through hole 8 with respect to the surface on which the pad body 4 is provided. 9 is provided by welding. The core member 5 is provided with a bent portion 12 which is bent at a halfway portion in the width direction with the crawler plate 2 side being convex. Therefore, when the core member 5 is superimposed on the footwear plate 2 in a state where the hook portion 6 is engaged with one end portion in the width direction of the footwear plate 2, the bolt connecting portion 7 side is gradually worn with the bent portion 12 as a boundary. As a result, the gap 13 is formed between the periphery of the bolt connection portion 7 and the facing surface of the shoe plate 2.

When the bolt 16 is inserted into the bolt through hole 15 from the back side (the upper side in FIG. 1) of the crawler plate 2, the tip of the bolt 16 passes through the bolt through hole 8 of the core material 5 and the nut member 9 (i.e., the bolt 16 can be screwed into the bolt connection 7), and is large enough to be released when the bolt 16 is tightened to the bolt connection 7 in this inserted state. It is supposed to be.

In order to set the size of the gap 13 as described above, the length M from the end on the side where the hook portion 6 is engaged to the position where the bent portion 12 corresponds to the footwear plate 2 is set. In a range (N <M) up to the center position of the width L of the crawler board 2 and exceeding the length N with which the hook portion 6 engages with the crawler board 2.
<2 / L). When attaching the elastic pad 1 having such a configuration to the crawler 2, the elastic pad 1 is inserted from the outer side in the width direction of the crawler so that its hook portion 6 faces inward, and this hook portion 6 is inserted into the crawler plate 2. When the elastic pad 1 is overlapped on the outer surface 2a of the footwear board 2 after being hooked on the end of the shoe, the front side between the bolt connection portion 7 of the elastic pad 1 and the facing face of the footwear board 2 as described above. A gap 13 is formed in the gap.

Therefore, when the bolt 16 is inserted from the back side of the shoe plate 2 and tightened into the bolt connecting portion 7, the core material 5 of the elastic pad 1 is separated from the bent portion 12 by the bolt connecting portion 7. A warp occurs such that the end approaches the footwear plate 2. Accordingly, the gap 13 gradually decreases, and is completely eliminated when the bolt 16 is strongly tightened, so that the core member 5 and the crawler plate 2 perfectly overlap.

At this time, as shown in FIG. 2, the warping action of the core material 5 in the X direction is caused by the direction in which the hook 6 is pulled out from the crawler plate 2 in the opposite region beyond the bent portion 12 (indicated by the arrow Y). As shown in the drawing, the outer peripheral surface 2a of the crawler plate 2 acts on the outer surface 2a of the crawler plate 2 by acting as a strong urging force in a direction radially outward with respect to the circumferential direction of the crawler plate. It is fixed in a state biased to.

Therefore, there is no room for rattling between the hook portion 6 and the shoe plate 2 within the clearance 18, and the state of mounting the elastic pad 1 on the shoe plate 2 becomes extremely strong. 3 to 5 show an elastic pad 1 according to the present invention.
Of the second embodiment is shown. In the second embodiment, in order to generate a gap 13 between the periphery of the bolt connection portion 7 of the core member 5 and the facing surface of the crawler plate 2, a protrusion toward the crawler plate 2 is provided at a halfway portion of the core member 5 in the width direction. 20 are provided.

The projection 20 is formed by providing a curved portion on the core material 5 itself. Note that the protrusion 20 is provided in FIG.
As shown in FIG.
As shown in FIG. Thus, the core material 5
In the projection 20 provided by bending itself, a recess 21 is necessarily formed on the surface of the core 5 on which the pad body 4 is provided. Since the recess 21 increases the contact area between the core member 5 and the pad body 4, there is a secondary effect that the bonding strength between the two increases.

FIG. 6 shows a third embodiment of the elastic pad 1 according to the present invention.
1 shows an embodiment. Also in the third embodiment, the core 5
13 between the periphery of the bolt connecting portion 7 and the facing surface of the footwear plate 2
In order to generate the
The projection 20 is provided. However, the projection 20 is formed by welding the tip or building up the welding itself, by forming a screw head by screwing a screw into the core material 5, or by manufacturing the core material 5 by casting or forging. As an integral part of this manufacturing process.

The protrusions 20 may be provided so as to cross the core material 5 as shown in FIG. 4 or may be provided in a dotted manner as shown in FIG. By the way, the present invention
It is not limited to the above embodiment. For example, the hook portion 6 is not limited to be bent in a U-shape, but may be bent in an L-shape. Alternatively, the hook portion 6 may be a separate member bent in an L-shape or the like without being integrated with the core member 5. It may be formed by welding or bolting to the core material 5.

The bolt connecting portion 7 may have a structure in which a bolt protrudes from the core member 5 toward the shoe plate 2 and a nut is screwed from the back side of the shoe plate 2. In addition, a bolt hole is formed in the core member 5, and a large-diameter hole is formed in the pad body 4 so as to match the bolt hole to the tread side, and the bolt hole and the large-diameter hole are formed. Alternatively, a structure may be employed in which the bolts and nuts are used to fasten the bolts and the bolts to the bolt holes 15 of the footwear plate 2.

[0024]

[Other Disclosure] An elastic pad 30 shown in FIGS. 7 and 8 has a pad body 31 and a core material 32 provided on the back surface of the pad body 31.
Is formed of an elastic material such as rubber or urethane, and the core material 32 is formed of a metal material such as iron (an integrated product that is drawn, cast, forged, or the like, or a welded product of a plurality of members). These are integrated with each other by baking, insert, bonding or the like.

Although not shown, in order to attach the elastic pad 30 to the crawler footboard 2, a bolt can be inserted through the core material 32 from the tread side of the pad body 31. A structure is adopted in which a nut is screwed on the back side of the track plate 2 with respect to the bolt. Pad body 3
While the planar shape of 1 is rectangular, the planar shape of the core material 32 is such that both ends in the width direction are tapered. That is, at both ends in the width direction of the elastic pad 1, both front and rear (vertical directions in FIG. 7) corners along the circumferential direction of the crawler are formed only by the pad main body 31, and the core material 32 does not extend. It has become.

The core member 32 is formed to be shorter than the width of the pad body 31 in the width direction, and does not extend to both ends of the pad body 31 in the width direction. Are formed in an inclined shape in which both ends in the width direction gradually become thinner. With such a structure, the front and rear corners at both ends in the width direction of the pad body 31 are less likely to be worn when passing through a curve or turning while traveling, and the gap between the step and a stone or the like and the core material 32. In this case, it is difficult to cause loss due to pinching. Furthermore, even if such abrasion or chipping occurs, the core material 32 is hardly exposed in these portions.

That is, when the core material 36 has a rectangular shape similar to the pad body 31 as in the elastic pad 35 of the prior art shown in FIG. 9, both ends in the width direction of the pad body 31 as described above are used. The front and rear corners of the part are susceptible to wear and breakage.
Each of the corners may be exposed, damaging the road surface or generating noise or vibration. However, the elastic pad 30 shown in FIGS. 7 and 8 can prevent these.

In addition, in the elastic pad 30, the core material 32 is reduced in size as a result, which leads to a reduction in weight, a reduction in manufacturing cost and running economy, and an improvement in running performance. Can also be achieved.
In order to make both ends in the width direction of the core material 32 tapered, it is possible to form an oval-shaped smooth curve or a chamfered square shape.

[0029]

As is apparent from the above description, in the elastic pad according to the present invention, the hook provided on the core is engaged with one end in the width direction of the shoe to overlap the core with the shoe. In the above, a predetermined gap is formed between the facing surface of the footwear plate and around the bolt connection portion provided at the end of the core material opposite to the hook portion, so that the footwear plate at the bolt connection portion When this connection is made, as this gap is resolved,
The core material itself will be warped. Therefore, this warp acts to strongly urge the hook portion of the core material in the direction of pulling out from the footwear plate, and the hook portion and the footwear plate rattle within the clearance generated between the engagement of the hook portion and the footwear plate. There is no room for that to happen.

From the above, the elastic pad can be securely attached to the footwear even if it is subjected to running vibration and the like, so that the elastic pad can be prevented from noise and vibration, etc. It can prevent loosening, abrasion, breakage, and the like of the bolt connection portion.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing a state in which a first embodiment of an elastic pad according to the present invention is mounted on a crawler plate of a metal crawler.

FIG. 2 is an enlarged front sectional view showing a state after the main part (around the hook part) of FIG.

FIG. 3 is an enlarged front sectional view showing a main part of a second embodiment of the elastic pad according to the present invention.

FIG. 4 is a partial plan view of an elastic pad according to a second embodiment, as viewed from a surface on which a protrusion is provided.

FIG. 5 is a partial plan view showing an example in which the arrangement of protrusions is changed so as to be easily compared with FIG.

FIG. 6 is an enlarged front sectional view showing a main part of a third embodiment of the elastic pad according to the present invention.

FIG. 7 is a bottom view showing an elastic pad according to another disclosure from the tread side thereof.

FIG. 8 is a front sectional view showing the elastic pad of FIG. 7;

FIG. 9 is a bottom view showing a conventional elastic pad, which is in contrast to the elastic pad according to another disclosure, from the tread side thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Elastic pad 2 Footboard 2a Outer surface 4 Pad body 5 Core material 6 Hook part 7 Bolt connection part 12 Bend part 13 Clearance 18 Clearance 20 Projection

Claims (3)

[Claims] 1. An outer surface (2) of each footwear plate (2) against a metal crawler in which a number of metal footwear plates (2) are connected endlessly.
a) an elastic pad attached to a) comprising: a pad body (4) made of an elastic material; and a core material (5) provided on the back side of the pad body (4), and a width of the core material (5). A hook portion (6) that can be engaged with the shoe plate (2) is provided at one end in the direction, and a bolt connection portion (7) to the shoe plate (2) is provided at the other end. When the hook (6) is engaged with one end in the width direction of the crawler plate (2) so as to be superimposed on the crawler plate (2), the core member (5) is formed around the bolt connection portion (7). A metal crawler characterized in that a gap (13) can be generated between the facing surface of the plate (2) and the gap (13) that can be eliminated by connecting the bolt connecting portion (7) to the footwear plate (2). For elastic pad. The gap (13) between the periphery of the bolt connecting portion (7) of the core material (5) and the facing surface of the footwear plate (2) is equal to that of the core material (5).
The elastic pad for a metal crawler according to claim 1, characterized in that the elastic pad is formed by providing a bent portion (12) protruding toward the footwear plate (2) in the middle part in the width direction. The gap (13) between the periphery of the bolt connection portion (7) of the core material (5) and the facing surface of the footwear plate (2) is equal to that of the core material (5).
The elastic pad for a metal crawler according to claim 1, characterized in that the elastic pad is formed by providing a projection (20) toward the footwear plate (2) in the middle part in the width direction.